Alkylene oxide conveying flow control method, controller and device

Abstract

The invention provides a method, a controller and a device for controlling the conveying flow of epoxyalkane, and the method comprises the steps: detecting the process total pressure of a gas phase space in a reaction assembly in a production process, and obtaining the conveying flow of the epoxyalkane based on a pre-constructed corresponding relation between the pressure and the critical ignition point concentration of the epoxyalkane, determining the safety pressure corresponding to the alkylene oxide concentration in the gas phase space in the current reaction assembly; and then, the conveying flow is dynamically adjusted based on the process total pressure and the safety pressure, so that the alkylene oxide concentration is always below the ignition point concentration of the corresponding pressure condition, and the intrinsic safety of the production process is ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of alkoxylation production process, and particularly relates to a control method, a controller and a device for the delivery flow of alkylene oxide. BACKGROUND

[0002] The alkoxylation reaction is a ring-opening polymerization reaction of a starting agent containing active hydrogen and alkylene oxide under the action of a catalyst. The product prepared by the reaction can be referred to as an alkoxylation product. The alkoxylation product is widely used in the fields of building, daily chemical, paint, textile printing and dyeing, agricultural emulsion, rubber, etc.

[0003] The alkylene oxide used in the alkoxylation reaction usually has flammable and explosive properties, such as ethylene oxide and propylene oxide. When the concentration of the alkylene oxide in the gas phase space in the reaction assembly reaches the ignition concentration, there is a risk of combustion and explosion. Therefore, how to control the concentration of the alkylene oxide in the gas phase space in the reaction assembly so that the concentration of the alkylene oxide in the entire alkoxylation reaction process is below the ignition concentration to ensure the safety of the reaction process becomes a technical problem to be solved in the field. SUMMARY

[0004] In order to make the concentration of the alkylene oxide in the entire alkoxylation reaction process below the ignition concentration to ensure the safety of the reaction process, the application provides a control method, a controller and a device for the delivery flow of alkylene oxide.

[0005] In the first aspect, the application provides a control method for the delivery flow of alkylene oxide, which comprises: delivering the alkylene oxide to a reaction assembly at a first delivery flow; the starting agent, the catalyst and the protective gas required for the current production batch are pre-added in the reaction assembly, so that the alkylene oxide reacts with the starting agent under the catalysis of the catalyst and the protection of the protective gas to generate a target product; determining the concentration of the alkylene oxide in the gas phase space in the reaction assembly and the process total pressure of the gas phase space at a first time point; the first time point is any time point in the process of delivering the alkylene oxide required for the current production batch to the reaction assembly; determining the safe pressure corresponding to the concentration of the alkylene oxide based on the pre-constructed corresponding relationship between the pressure and the critical ignition concentration of the alkylene oxide; determining the second delivery flow based on the safe pressure in the case that the process total pressure is greater than the safe pressure; adjusting the first delivery flow to the second delivery flow, and continuing to deliver the alkylene oxide to the reaction assembly at the second delivery flow, so that the concentration of the alkylene oxide in the gas phase space in the reaction assembly is reduced to below the critical ignition concentration of the alkylene oxide corresponding to the safe pressure. The first time point is any time point in the process of delivering the alkylene oxide required for the current production batch to the reaction assembly; determining the safe pressure corresponding to the concentration of the alkylene oxide based on the pre-constructed corresponding relationship between the pressure and the critical ignition concentration of the alkylene oxide; determining the second delivery flow based on the safe pressure in the case that the process total pressure is greater than the safe pressure; adjusting the first delivery flow to the second delivery flow, and continuing to deliver the alkylene oxide to the reaction assembly at the second delivery flow, so that the concentration of the alkylene oxide in the gas phase space in the reaction assembly is reduced to below the critical ignition concentration of the alkylene oxide corresponding to the safe pressure.

[0006] ​In one possible implementation, the method further includes: when the total process pressure is less than the safety pressure, determining a third delivery flow rate based on the safety pressure; adjusting the first delivery flow rate to the third delivery flow rate, and continuing to deliver alkylene oxide to the reaction component at the third delivery flow rate, so that the concentration of alkylene oxide in the gas phase space within the reaction component is increased and is below the critical ignition point concentration of alkylene oxide corresponding to the safety pressure; when the total process pressure is equal to the safety pressure, maintaining the delivery of alkylene oxide to the reaction component at the first delivery flow rate.

[0007] In one possible implementation, determine The concentration of alkylene oxide in the gas phase space of the reaction component at the moment includes: determining the The process partial pressure of the protective gas in the gas phase space of the reaction component at all times; based on the process partial pressure and the process total pressure, determine the The concentration of alkylene oxide in the gas phase at time t.

[0008] In one possible implementation, determine The partial pressure of the protective gas in the gas phase space of the reaction component at all times, including: determining the cut-off pressure The cumulative mass of alkylene oxide delivered to the reaction component at the moment The process temperature in the reaction component at the moment; using the first relationship, calculate the The density of the liquid material in the reaction component at any moment, the first relationship is: ; in, Indicates the The density of the liquid material in the reaction component at all times, represents the density of the initiator in the reaction component, Indicates the density of the target product corresponding to the current production batch; Indicates the end of The cumulative mass of alkylene oxide delivered to the reaction component at this moment, Indicates the total mass of alkylene oxide required for the current production batch, Indicates the total mass of the starting agent required for the current production batch; Using the second relation, calculate The process partial pressure of the protective gas in the gas phase space at all times, the second relationship is: ; in, Indicates the Always protect the process partial pressure of gas in the gas phase space, Indicates the initial partial pressure of the protective gas in the gas phase space under the initial conditions; represents the volume of the reaction component, Indicates the a process temperature in the reaction assembly at the moment, represents an initial temperature in the reaction assembly under initial conditions; the initial conditions refer to that the starting agent, the catalyst and the protective gas are added in the reaction assembly, and the alkylene oxide is not introduced.

[0009] In a possible implementation, the reaction assembly is configured with a protective gas pressure detection device; the alkylene oxide concentration in the gas phase space in the reaction assembly at the moment is determined by determining the pressure value detected by the protective gas pressure detection device at the moment as the process partial pressure of the protective gas in the gas phase space in the reaction assembly at the moment. the process temperature in the reaction assembly at the moment, the pressure value detected by the protective gas pressure detection device at the moment; the pressure value is determined as the process partial pressure of the protective gas in the gas phase space in the reaction assembly at the moment. the process temperature in the reaction assembly at the moment,

[0010] In a possible implementation, the alkylene oxide concentration in the gas phase space at the moment is determined based on the process partial pressure and the process total pressure, and the alkylene oxide concentration in the gas phase space at the moment is determined by calculating the alkylene oxide concentration in the gas phase space at the moment by using a third relationship. the alkylene oxide concentration in the gas phase space at the moment, the alkylene oxide concentration in the gas phase space at the moment,

[0011] wherein, the alkylene oxide concentration in the gas phase space at the moment, the alkylene oxide concentration in the gas phase space at the moment, the process total pressure, the process partial pressure.

[0012] In a possible implementation, the reaction assembly is configured with an alkylene oxide concentration detection device; the alkylene oxide concentration in the gas phase space in the reaction assembly at the moment is determined by obtaining the alkylene oxide concentration detected by the alkylene oxide concentration detection device at the moment as the alkylene oxide concentration in the gas phase space in the reaction assembly at the moment. the alkylene oxide concentration in the gas phase space in the reaction assembly at the moment, the alkylene oxide concentration detected by the alkylene oxide concentration detection device at the moment; the alkylene oxide concentration is determined as the alkylene oxide concentration in the gas phase space in the reaction assembly at the moment. the alkylene oxide concentration in the gas phase space in the reaction assembly at the moment.

[0013] In a possible implementation, the safe pressure corresponding to the alkylene oxide concentration is determined based on the pre-constructed pressure and alkylene oxide critical ignition point concentration corresponding relationship, and the safe pressure corresponding to the alkylene oxide concentration is determined by determining the maximum pressure that can be borne by the alkylene oxide concentration based on the pre-constructed pressure and alkylene oxide critical ignition point concentration corresponding relationship, and determining the safe pressure corresponding to the alkylene oxide concentration based on the maximum pressure and a preset safety coefficient.

[0014] In a second aspect, an embodiment of the present application provides a controller, including a memory and a processor, the memory stores a computer program, and the program can implement the method in any one of the first aspect when executed by the processor.

[0015] In a third aspect, the embodiments of the present application provide an alkylene oxide ring-opening reaction device, comprising: a reaction assembly; an alkylene oxide delivery channel, which is in communication with the reaction assembly and is configured to deliver alkylene oxide to the reaction assembly; the reaction assembly is pre-loaded with a starter, a catalyst and a protective gas required for a current production batch, so that the alkylene oxide reacts with the starter to generate a target product under the catalysis of the catalyst and the protective atmosphere provided by the protective gas; a flow control valve, which is arranged on the alkylene oxide delivery channel and is configured to adjust the delivery flow of the alkylene oxide; a pressure detection device, which is configured to detect the pressure of the gas phase space in the reaction assembly; and a controller according to the second aspect, which is connected with the flow control valve and the pressure detection device.

[0016] In a fourth aspect, the embodiments of the present application provide an alkylene oxide ring-opening reaction method, comprising: loading a starter, a catalyst and a protective gas required for a current production batch into a reaction assembly; delivering alkylene oxide to the reaction assembly through an alkylene oxide delivery channel; and performing heat exchange and circulation treatment on the substances in the reaction assembly through a heat exchange assembly, so that the starter after the heat exchange and circulation treatment reacts with the alkylene oxide to generate a target product under the catalysis of the catalyst and the protective atmosphere provided by the protective gas; wherein, during the delivery of the alkylene oxide to the reaction assembly through the alkylene oxide delivery channel, the pressure of the gas phase space in the reaction assembly is detected by a pressure detection device, and a controller according to the second aspect is used to dynamically adjust the delivery flow of the alkylene oxide based on the pressure.

[0017] The control method, controller and device for the delivery flow of the alkylene oxide provided by the present application detect the total pressure of the gas phase space in the reaction assembly during the production process, determine the safe pressure corresponding to the concentration of the alkylene oxide in the gas phase space in the reaction assembly based on the pre-constructed corresponding relationship between the pressure and the critical ignition point concentration of the alkylene oxide, and then dynamically adjust the delivery flow based on the total pressure and the safe pressure, so that the concentration of the alkylene oxide is always below the ignition point concentration under the corresponding pressure condition, thereby ensuring the intrinsic safety of the production process. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0019] Figure 1 A structural schematic diagram of an alkylene oxide ring-opening reaction device provided by the embodiments of the present application.

[0020] Figure 2 A flowchart of a control method for the delivery flow of an alkylene oxide provided by the embodiments of the present application.

[0021] Figure 3 A flow chart of a process for determining a partial pressure of a protective gas is provided for the embodiments of the present application.

[0022] Figure 4 A graph of a relationship between pressure and critical flame point concentration of ethylene oxide is provided for the embodiments of the present application.

[0023] Figure 5 A flow chart of a ring-opening reaction method of an alkylene oxide is provided for the embodiments of the present application.

[0024] BRIEF DESCRIPTION OF DRAWINGS 1 - reaction assembly, 11 - reactor, 12 - collector, 13 - temperature detection device, 14 - pressure detection device; 2 - alkylene oxide delivery channel, 21 - flow control valve; 3 - controller; 4 - first heat exchange assembly, 41 - first circulating pump, 42 - first heat exchanger; 5 - second heat exchange assembly, 51 - second circulating pump, 52 - second heat exchanger. DETAILED DESCRIPTION

[0025] The present application will be further described by the following drawings and embodiments. Through these descriptions, the features and advantages of the present application will become more apparent.

[0026] The term "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. Unless specifically stated otherwise, the drawings are not drawn to scale and the disclosure is not limited to the specific embodiments illustrated in the drawings.

[0027] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0028] Alkoxylated products are widely used in the fields of construction, daily chemicals, coatings, textile printing and dyeing, agricultural emulsions, rubber, etc. In industry, alkoxylated products are usually prepared by ring-opening polymerization reaction (also known as alkoxylization reaction) of alkylene oxide with a starter under the action of a catalyst. The starter refers to a substance capable of initiating a chemical reaction (such as polymerization, chain reaction, etc.), which usually starts the reaction by providing active free radicals, ions or other active intermediates. The starter used in the alkoxylization reaction is usually a substance containing active hydrogen, especially for example, alcohol compounds.

[0029] The embodiments of the present application do not limit the specific form of the alkylene oxide, the starter, and the catalyst, and the alkylene oxide, the starter, and the catalyst commonly used in the art can be used in the present application. In particular, the alkylene oxide can be a C2 to C4 alkylene oxide, for example, ethylene oxide, propylene oxide, butylene oxide, etc. The starter can be a starter containing active hydrogen, and the catalyst can be a base, such as sodium hydroxide or potassium hydroxide.

[0030] In the above reaction process, the raw material alkylene oxide participating in the alkoxylation reaction generally has flammable and explosive characteristics. Taking ethylene oxide as an example, since the ethoxylation reaction process of ethylene oxide with the starter containing active hydrogen under the action of the catalyst is violent, the reaction needs to be carried out in a nitrogen protective atmosphere. However, when the concentration of ethylene oxide in the gas phase space in the reaction assembly reaches the ignition concentration, there is still a risk of combustion and explosion.

[0031] Therefore, how to control the concentration of ethylene oxide in the gas phase space in the reaction assembly so that the concentration of ethylene oxide is below the ignition concentration during the entire ethylene oxide reaction process to ensure the safety of the reaction process has become a technical problem to be solved in the art.

[0032] In one possible implementation manner, the concentration of ethylene oxide in the gas phase space in the reaction assembly is controlled in the following manner: a safety model of ethylene oxide and nitrogen under standard atmospheric pressure is constructed, for example, through the safety model, it can be determined that the concentration of nitrogen is controlled to be greater than or equal to 25%, which can ensure that the concentration of ethylene oxide is below the ignition concentration. Based on this, during the ethoxylation reaction process, the concentration of ethylene oxide is controlled to be below the ignition concentration by controlling the volume concentration of nitrogen in the gas phase space in the reaction assembly to be greater than or equal to 25%.

[0033] The inventors have found in practical applications that the control method provided in the above can control the concentration of ethylene oxide to be below the ignition concentration to a certain extent, but cannot ensure that the concentration of ethylene oxide is below the ignition concentration during the entire ethylene oxide reaction process. The inventors analyze the reason as follows: in actual production, the pressure in the gas phase space in the reaction assembly changes with the progress of the ethoxylation reaction and is not constant, and the ignition concentration of ethylene oxide is not the same under different pressures. Specifically, the greater the pressure in the gas phase space in the reaction assembly, the lower the corresponding ignition concentration of ethylene oxide.

[0034] Thus, during the ethoxylation reaction, if the pressure in the gas phase space of the reaction assembly increases, the ignition point concentration of ethylene oxide decreases. In this case, the control method provided above does not take into account the influence of the change of the pressure in the gas phase space of the reaction assembly on the ignition point concentration of ethylene oxide, and still controls the nitrogen concentration to be greater than or equal to 25%, so that the ethylene oxide concentration is still maintained below the ignition point concentration of ethylene oxide under standard atmospheric pressure. Thus, the regulated ethylene oxide concentration may have exceeded the ignition point concentration of ethylene oxide under the current pressure condition. That is, the control method provided above cannot guarantee that the ethylene oxide concentration is below the ignition point concentration throughout the ethoxylation reaction process, and the risk of ethylene oxide explosion is high, which cannot guarantee safe production.

[0035] The above is only exemplarily described by taking the ethoxylation reaction as an example. Similarly, other alkoxylation reactions have the same problems, which are not described one by one here.

[0036] To ensure that the alkylene oxide concentration is below the ignition point concentration throughout the alkoxylation reaction process and guarantee safe production, the embodiments of the present application provide a control method for the delivery flow of alkylene oxide, a controller and an alkylene oxide ring-opening reaction device. The control method provided by the embodiments of the present application dynamically adjusts the alkylene oxide concentration in the gas phase space in the reaction assembly in combination with the corresponding relationship between the pressure and the ignition point concentration of alkylene oxide, so that the ethylene oxide concentration in the gas phase space in the reaction assembly is below the corresponding ignition point concentration under different pressure conditions throughout the alkoxylation reaction process, thereby guaranteeing the intrinsic safety of the reaction process.

[0037] To facilitate the understanding of the technical solutions provided by the embodiments of the present application, the alkylene oxide ring-opening reaction device provided by the embodiments of the present application is described first.

[0038] Figure 1 A structural schematic diagram of the alkylene oxide ring-opening reaction device provided by the embodiments of the present application.

[0039] As shown in Figure 1 , the alkylene oxide ring-opening reaction device provided by the embodiments of the present application can include a reaction assembly 1, an alkylene oxide delivery channel 2, a controller 3, a first heat exchange assembly 4 and a second heat exchange assembly 5.

[0040] The reaction assembly 1 is a device for reacting alkylene oxide with an initiator. The initiator, catalyst, and protective gas may be pre-added to the reaction assembly 1. An alkylene oxide delivery channel 2 is connected to the reaction assembly 1 at one end. Alkylene oxide is delivered to the reaction assembly 1 through the alkylene oxide delivery channel 2 so that the alkylene oxide reacts with the initiator and catalyst pre-added to the reaction assembly 1 in the protective gas to produce the target product. A flow control valve 21 may be provided on the alkylene oxide delivery channel 2. The flow control valve 21 may be connected to a controller 3, so that the controller 3 can adjust the flow rate of the alkylene oxide by controlling the flow control valve 21.

[0041] The first heat exchange assembly 4 may include a first circulation pump 41 and a first heat exchanger 42. One end of the first circulation pump 41 may be connected to the bottom of the reaction assembly 1, and the other end of the first circulation pump 41 is connected to one end of the first heat exchanger 42, and the other end of the first heat exchanger 42 may be connected to the top of the reaction assembly 1. After the alkylene oxide passes through the alkylene oxide delivery channel 2 to the reaction assembly 1, the first circulation pump 41 may be activated to pump the liquid material (such as the initiator and catalyst) in the reaction assembly 1 into the first heat exchanger 42 for heat exchange treatment. After the heat exchange treatment, the liquid material is pumped back into the reaction assembly 1 and ejected through the top of the reaction assembly 1 to react with the alkylene oxide delivered to the reaction assembly 1.

[0042] The second heat exchange assembly 5 may include a second circulation pump 51 and a second heat exchanger 52. One end of the second circulation pump 51 may be connected to the bottom of the reaction assembly 1, and the other end of the second circulation pump 51 is connected to one end of the second heat exchanger 52, and the other end of the second heat exchanger 52 may be connected to the top of the reaction assembly 1. After the alkylene oxide passes through the alkylene oxide delivery channel 2 to the reaction assembly 1, the second circulation pump 51 may be started to pump the liquid material in the reaction assembly 1 into the second heat exchanger 52 for heat exchange treatment. The liquid material after heat exchange treatment is re-pumped into the reaction assembly 1 and ejected through the top of the reaction assembly 1 to react with the alkylene oxide delivered to the reaction assembly 1.

[0043] It should be noted that the heat exchange areas of the first heat exchange component 4 and the second heat exchange component 5 may be the same or different, and this embodiment of the present application does not limit this.

[0044] It should also be noted that the first heat exchange assembly 4 and the second heat exchange assembly 5 can be selected for use according to actual circumstances, and this embodiment of the present application does not limit this. For example, in some scenarios, the first heat exchange assembly 4 and the second heat exchange assembly 5 can be used in conjunction. In other scenarios, the first heat exchange assembly 4 and the second heat exchange assembly 5 can also be used independently. Specific usage methods can be referred to the description of the relevant technology and will not be elaborated here.

[0045] In some embodiments, the reaction assembly 1 can comprise a reactor 11 and a collector 12 which are in communication with each other. In this case, the initiator and the catalyst can be added to the collector 12, the alkylene oxide conveying channel 2 can be in communication with the reactor 11, and the first heat exchanger 42 and / or the second heat exchanger 52 can be in communication with the reactor 11. In this way, the alkylene oxide conveyed to the reactor 11 can react with the liquid material pumped into the reactor 11 in the reactor 11, and the product obtained by the reaction can be collected by the collector 12.

[0046] In the case where the reaction assembly 1 comprises a reactor 11 and a collector 12 which are in communication with each other, the first heat exchanger 42 can be in communication with the top end of the reactor 11, and the second heat exchanger 52 can be in communication with the top end of the collector 12.

[0047] It should be noted that the embodiments of the present application do not limit the specific form of the reaction assembly 1, for example, the reaction assembly 1 can be a stirred tank reactor assembly, a PRESS external circulation reactor assembly, a BUSS jet loop reactor assembly, a tubular reactor assembly, etc.

[0048] In some embodiments, the reaction assembly 1 can further be provided with one or more detection devices for detecting parameters such as temperature, pressure, concentration, etc. during the alkoxylation reaction. The one or more detection devices can be connected (wired or wirelessly) to the controller 3 to transmit the respective detected parameters to the controller 3.

[0049] In some embodiments, the reaction assembly 1 can comprise a temperature detection device 13 and a pressure detection device 14. The temperature detection device 13 can be used to detect the ambient temperature in the reaction assembly 1, and the pressure detection device 14 can be used to detect the total pressure in the gas phase space in the reaction assembly 1.

[0050] In some embodiments, the reaction assembly 1 can comprise a temperature detection device 13 and a protective gas pressure detection device (not shown in the figure). In this case, the temperature detection device 13 can be used to detect the ambient temperature in the reaction assembly 1, and the protective gas pressure detection device can be used to detect the partial pressure of the protective gas in the gas phase space in the reaction assembly 1.

[0051] In some embodiments, the reaction assembly 1 can comprise a temperature detection device 13 and an alkylene oxide concentration detection device (not shown in the figure). In this case, the temperature detection device 13 can be used to detect the ambient temperature in the reaction assembly 1, and the alkylene oxide concentration detection device can be used to detect the concentration of the alkylene oxide in the gas phase space in the reaction assembly 1.

[0052] The embodiments of the present application do not limit the specific installation position of the above-mentioned detection devices, as long as the corresponding parameters can be detected. For example, the protective gas pressure detection device and the alkylene oxide concentration detection device can be installed in the gas phase space in the reaction assembly 1, or in the gas phase space in the collector 12. Figure 1The pressure detection device 14 shown corresponds to the position.

[0053] It should be noted that the protective gas in the embodiments of the present application is not limited, as long as it can provide a protective atmosphere, for example, the protective gas can be nitrogen or inert gas. Correspondingly, in the case of selecting nitrogen as the protective gas, the protective gas pressure detection device can be a nitrogen pressure detection device; in the case of selecting inert gas as the protective gas, the protective gas pressure detection device can be an inert gas pressure detection device. For example, the protective gas pressure detection device can be a gas chromatograph and the like.

[0054] It should also be noted that the alkylene oxide concentration detection device can be adapted according to the actual selected alkylene oxide. For example, in the case of alkylene oxide being ethylene oxide, the alkylene oxide concentration detection device can be a device capable of detecting the concentration of ethylene oxide; in the case of alkylene oxide being propylene oxide, the alkylene oxide concentration detection device can be a device capable of detecting the concentration of propylene oxide. For example, the alkylene oxide concentration detection device can be an infrared spectrum (IR) sensor, a gas chromatograph, etc.

[0055] Based on the above introduction of the alkylene oxide ring-opening reaction device, the use process of the alkylene oxide ring-opening reaction device is described below.

[0056] The alkylene oxide ring-opening reaction device provided in the embodiments of the present application can be used for batch production of alkoxylated products. Batch production refers to producing alkoxylated products one batch at a time, and the method of each production batch is the same. The use method of the alkylene oxide ring-opening reaction device is described below with the production process of one production batch as an example.

[0057] In the current production batch, the total mass of the starter required by the current production batch can be determined in advance , the total mass of the alkylene oxide , and the total amount of the protective gas, and the density of the starter used in the current production batch and the density of the target product to be finally generated ( ) can also be determined.

[0058] As Figure 1 shown, in the current production batch, all the starters, catalysts and protective gases required by the current production batch are added in advance in the reaction assembly 1; then, the alkylene oxide is transported to the reaction assembly 1 through the alkylene oxide transport channel 2 until all the alkylene oxide required by the current production batch is transported.

[0059] After the alkylene oxide conveying passage 2 starts to convey the alkylene oxide into the reaction assembly 1, the first heat exchange assembly 4 and / or the second heat exchange assembly 5 can be opened to heat treat part of the liquid material (including the starter and the catalyst) in the reaction assembly 1 and then pump the liquid material into the reaction assembly 1 again through the top of the reaction assembly 1 to react with the alkylene oxide conveyed into the reaction assembly 1 to generate the target product.

[0060] During different stages of the production, the pressure in the gas phase space in the reaction assembly 1 changes. For example, at the initial stage of the reaction, the alkylene oxide is gradually fed into the reaction assembly 1, the conditions (such as suitable temperature, catalyst action, etc.) for initiating the reaction start to take effect, and the addition reaction of the alkylene oxide and the starter starts to initiate. At this time, the pressure in the gas phase space is generally at a relatively low initial level, but as the reaction initiates, factors such as changes in the state of the material (for example, part of the material vaporizes), generation of gas, etc. will make the pressure start to rise. At the middle stage of the reaction, as the alkoxylation reaction proceeds steadily and continuously, the alkylene oxide continuously reacts with the starter, and a large amount of reaction heat is continuously released, which causes more components in the liquid phase material to vaporize into the gas phase space, and the pressure in the gas phase space continuously rises. At the later stage of the reaction, the rate of the alkoxylation reaction may start to slow down, and the newly generated substances also correspondingly decrease, and the trend of the pressure rise in the gas phase space starts to slow down, until the reaction approaches complete, and the pressure in the gas phase space gradually stabilizes and finally tends to a relatively constant value.

[0061] During the production, one or more detection devices on the alkylene oxide ring-opening reaction device can detect corresponding parameters in real time and transmit the parameters to the controller 3. Then, the controller 3 can combine the received parameters and use the control logic pre-configured in the controller 3 to control the flow control valve 21 to adjust the conveying flow of the alkylene oxide, so that the concentration of the alkylene oxide in the gas phase space in the reaction assembly under different pressure conditions during the entire alkoxylation reaction process of the current production batch is always below the corresponding ignition point concentration, to ensure safe production.

[0062] The control logic provided by the embodiments of the present application, i.e., the control method of the conveying flow of the alkylene oxide, will be described in detail below.

[0063] Figure 2 A flow chart of the control method of the conveying flow of the alkylene oxide provided by the embodiments of the present application.

[0064] As shown in Figure 2 The control method of the conveying flow of the alkylene oxide provided by the embodiments of the present application can include the following steps: Step S101: conveying the alkylene oxide into the reaction assembly 1 at a first conveying flow.

[0065] At the start of delivering alkylene oxide to the reaction assembly 1 through the alkylene oxide delivery channel 2, the first delivery flow rate may be a preset initial delivery flow rate. Accordingly, at the start of the delivery, the controller 3 may control the flow control valve 21 to deliver alkylene oxide to the reaction assembly 1 at the initial delivery flow rate.

[0066] Thereafter, the initial delivery flow rate may be adjusted or maintained based on the control logic of steps S102 to S108 described below.

[0067] At any time after the start time, the first delivery flow rate refers to the delivery flow rate determined in the most recent adjustment period. The first delivery flow rate at this time may be the same as or different from the initial delivery flow rate.

[0068] Step S102, determine the The concentration of alkylene oxide in the gas phase space of reaction component 1 at the moment And the total process pressure of the gas phase space in the reaction component 1 .

[0069] Among them, The time can be any time during the process of delivering the alkylene oxide required for the current production batch to the reaction component 1. At this moment, the reaction component 1 includes liquid materials (such as initiators and catalysts) and gaseous materials (such as alkylene oxide and protective gas). The above-mentioned liquid materials occupy part of the space in the reaction component 1; except for the above-mentioned part of the space, the remaining space in the reaction component 1 is gaseous space.

[0070] The embodiment of the present application determines The concentration of alkylene oxide in the gas phase space of reaction component 1 at the moment The specific implementation method is not limited.

[0071] In some embodiments, the first Always protect the process partial pressure of the gas in the gas phase space within the reaction component ; Then, based on the process partial pressure and process total pressure , determine the Alkylene oxide concentration in the gas phase at time .

[0072] It should be understood that in At this moment, the gas phase space in the reaction component includes a mixture of protective gas and alkylene oxide. At this moment, the partial pressure of the protective gas in the mixed gas can be called the process partial pressure, and the total pressure of the mixed gas can be called the process total pressure.

[0073] During the entire reaction process of the current production batch, the molar number of the shielding gas is relatively stable, and the corresponding partial pressure of the alkylene oxide changes dynamically. According to the ideal gas state equation, the partial pressure ratio of the alkylene oxide to the shielding gas in the gas phase space within the reaction component is the molar ratio of the alkylene oxide to the shielding gas, that is, = ,in, and Indicates the The partial pressure of alkylene oxide and protective gas in the gas phase space of the reaction component at each moment, and Indicates the The number of moles of alkylene oxide and protective gas in the gas phase space of the reaction component at each moment.

[0074] The total process pressure of the gas phase space in the reaction component Including the partial pressure of alkylene oxide Partial pressure of shielding gas ,Right now = + The concentration of alkylene oxide can be expressed as the molar concentration of alkylene oxide, that is, Therefore, the process partial pressure of the protective gas in the gas phase space within the reaction component can be and process total pressure , calculate the concentration of alkylene oxide (i.e. the molar concentration of alkylene oxide).

[0075] For example, the following third relationship (1) can be used to calculate the concentration of alkylene oxide: .

[0076] %Relationship (1) in, It can be detected by the pressure detection device 14. It can be achieved by using any of the following possible implementation methods.

[0077] In one possible implementation, Figure 3 As shown, It can be obtained in the following way: Step S1021, determine the end of The cumulative mass of alkylene oxide delivered to the reaction component 1 at the moment and The process temperature in the moment reaction component 1 .

[0078] The embodiment of the present application determines the cumulative quality The specific implementation manner of the cumulative mass is not limited. For example, the cumulative mass can be calculated based on the total mass of the alkylene oxide required by the current production batch and the mass of the alkylene oxide that has not been delivered to the reaction assembly 1 at the moment The cumulative mass is calculated by the difference between the total mass of the alkylene oxide required by the current production batch and the mass of the alkylene oxide that has not been delivered to the reaction assembly 1 at the moment For another example, the cumulative mass can be calculated based on the delivery flow rate corresponding to each time period before the moment . .

[0079] Process temperature The process temperature can be detected by the temperature detection device 13 arranged in the reaction assembly 1.

[0080] In step S1022, the density of the liquid material in the reaction assembly 1 at the moment is calculated by using the first relational expression (2) .

[0081] Relational expression (2) The density of the liquid material in the reaction assembly under the condition that the initiator and the alkylene oxide are not completely reacted is between and Therefore, the first relational expression (2) described above can be used to calculate the density of the liquid material at the moment by interpolation based on the proportion of the alkylene oxide delivered.

[0082] In step S1023, the process partial pressure of the protective gas in the gas phase space at the moment is calculated by using the second relational expression (3) .

[0083] Relational expression (3) wherein, represents the initial partial pressure of the protective gas in the gas phase space in the reaction assembly under the starting condition; represents the volume of the reaction assembly; represents the ambient temperature in the reaction assembly under the starting condition. The starting condition refers to the condition that the initiator, the catalyst, and the protective gas are added into the reaction assembly, and the alkylene oxide is not delivered.

[0084] During the entire reaction process of the current production batch, the number of moles of the protective gas is relatively stable. According to the ideal gas state equation, the product of the process partial pressure of the protective gas in the gas phase space and the volume thereof at different moments remains unchanged. That is, the product of the process partial pressure of the protective gas in the gas phase space and the volume thereof at the moment and the initial moment (i.e., the moment under the starting condition) remains unchanged.

[0085] Based on this, the above relationship (3) can be used to calculate the process partial pressure of the protective gas in the gas phase space at the first time point t1. the process partial pressure of the protective gas in the gas phase space at the first time point t1. .

[0086] At the initial time point, the gas phase space in the reaction assembly only includes the protective gas, so the pressure detection device 14 can be used to detect the pressure of the gas phase space in the reaction assembly, and the detected pressure is the initial partial pressure of the protective gas in the gas phase space in the reaction assembly. In addition, the temperature detection device 13 can be used to detect the above-mentioned .

[0087] In another possible implementation manner, The protective gas pressure detection device can be configured in the reaction assembly to detect the partial pressure of the protective gas in the gas phase space in the reaction assembly. In this way, the controller 3 can directly obtain the pressure value detected by the protective gas pressure detection device at the first time point t1, and determine the pressure value as the process partial pressure of the protective gas in the gas phase space in the reaction assembly at the first time point t1. . .

[0088] In some embodiments, the alkylene oxide concentration detection device can also be configured in the reaction assembly to detect the alkylene oxide concentration in the gas phase space in the reaction assembly. In this way, when the alkylene oxide concentration in the gas phase space in the reaction assembly at the first time point t1 is determined, the controller can directly obtain the alkylene oxide concentration detected by the alkylene oxide concentration detection device at the first time point t1, and determine the alkylene oxide concentration as the alkylene oxide concentration in the gas phase space in the reaction assembly at the first time point t1. .

[0089] At step S103, the safe pressure corresponding to the alkylene oxide concentration at the first time point t1 is determined based on the pre-constructed pressure-alkylene oxide critical ignition point concentration correspondence relationship. .

[0090] In the embodiments of the present application, the pressure-alkylene oxide critical ignition point concentration correspondence relationship represents the correspondence relationship between the pressure of the gas phase space in the reaction assembly and the critical ignition point concentration of the alkylene oxide under the mixed atmosphere of the alkylene oxide and the protective gas. That is, the pressure-alkylene oxide critical ignition point concentration correspondence relationship can reflect the critical ignition point concentration of the alkylene oxide corresponding to the gas phase space in the reaction assembly under different pressure conditions.

[0091] The pressure-alkylene oxide critical ignition point concentration correspondence relationship can be a mapping table, a pressure-alkylene oxide concentration function, a model, etc., which is not limited in the present application.​​​

[0092] The following is an example of the relationship between pressure and the critical ignition point concentration of alkylene oxide, which is a pressure-alkylene oxide concentration function.

[0093] The present embodiment does not limit the specific implementation of the pressure-alkylene oxide concentration function. For example, the critical ignition point concentration of alkylene oxide in the mixture of alkylene oxide and protective gas under different pressures can be detected, and then the least squares method can be used to fit the pressure-critical ignition point concentration curve of ethylene oxide to obtain the pressure-alkylene oxide concentration function.

[0094] For example, the pressure-alkylene oxide concentration function constructed in advance is = (M EO )=-0.1522M EO +13.573, where represents the pressure of the gas phase space in the reaction assembly.

[0095] As shown in Figure 4 , different pressures correspond to different critical ignition point concentrations of ethylene oxide. For example, the critical ignition point concentrations of ethylene oxide under 150 kPa (1.5 bar), 200 kPa (2.0 bar), and 400 kPa (4.0 bar) are 88%, 80%, and 70%, respectively.

[0096] It should be noted that the corresponding pressure-alkylene oxide concentration function may be different under different alkylene oxide and protective gas conditions. In actual application, the pressure-alkylene oxide concentration function can be constructed according to the actual use scenario.

[0097] In some embodiments, a plurality of pressure-alkylene oxide concentration functions under different alkylene oxide and protective gas conditions can also be constructed in advance, and the plurality of pressure-alkylene oxide concentration functions are stored in the controller 3. In this way, in use, the controller 3 can call the corresponding pressure-alkylene oxide concentration function under the current alkylene oxide and protective gas condition, so that the versatility of the controller 3 is better.

[0098] After determining the alkylene oxide concentration of the gas phase space in the reaction assembly, the pressure-alkylene oxide concentration function can be used to determine the corresponding safe pressure of the current alkylene oxide concentration .

[0099] In some embodiments, the pressure-alkylene oxide concentration function can be used to determine the maximum pressure that can be tolerated by the current alkylene oxide concentration Then, based on a preset safety factor K (hereinafter can be referred to as a preset safety factor) and the maximum pressure , the current alkylene oxide concentration is calculated .

[0100] For example, when the current ethylene oxide concentration is 62.5%, the pressure-ethylene oxide concentration function is = (M EO )=-0.1522M EO +13.573, and the preset safety factor K is 0.8, the current alkylene oxide concentration corresponds to a safe pressure =K (M EO )=0.8×(-0.1522×62.5+13.573)×100=325 kPa.

[0101] That is, when the ethylene oxide concentration is 62.5%, the pressure in the gas phase space in the reaction assembly should not be greater than 325 kPa.

[0102] After that, based on the process total pressure and the safe pressure , it can be decided whether the delivery flow rate needs to be adjusted to achieve the adjustment of the alkylene oxide concentration in the gas phase space in the reaction assembly, which can include the following three cases: The first case, please refer to steps S104 to S105.

[0103] Step S104, in the case where the process total pressure is greater than the safe pressure , the second delivery flow rate is determined based on the safe pressure .

[0104] Step S105, the first delivery flow rate is adjusted to the second delivery flow rate, and the reaction assembly 1 continues to deliver alkylene oxide at the second delivery flow rate, so that the alkylene oxide concentration in the gas phase space in the reaction assembly is reduced to below the critical concentration of the alkylene oxide corresponding to the safe pressure.

[0105] In the case where the process total pressure is greater than the safe pressure , it indicates that the pressure in the gas phase space in the current reaction assembly is too large, and the concentration of alkylene oxide is too large. In this case, the first delivery flow rate can be adjusted to reduce the pressure in the gas phase space in the reaction assembly and the alkylene oxide concentration in the gas phase space in the reaction assembly, so that the adjusted alkylene oxide concentration is reduced to the safe pressure below the critical ignition point concentration of the corresponding alkylene oxide. For example, the delivery flow rate can be adjusted to the maximum value allowed under the current conditions. In this way, the adjusted alkylene oxide concentration is ensured to be below the critical ignition point concentration of the corresponding alkylene oxide at the safe pressure below the critical ignition point concentration of the corresponding alkylene oxide, ensuring the safety of production and maximizing the production efficiency.

[0106] In the second case, see steps S106 to S107.

[0107] Step S106, based on the process total pressure being less than the safe pressure , a third delivery flow rate is determined.

[0108] Step S107, the first delivery flow rate is adjusted to the third delivery flow rate, and the alkylene oxide is continuously delivered to the reaction assembly 1 at the third delivery flow rate, so that the alkylene oxide concentration in the gas phase space in the reaction assembly is raised to the critical ignition point concentration of the corresponding alkylene oxide at the safe pressure.

[0109] In the case where the process total pressure is less than the safe pressure , it indicates that the pressure in the gas phase space in the current reaction assembly is too small, and the concentration of the alkylene oxide is too small. In this case, the first delivery flow rate can be appropriately increased to increase the pressure in the gas phase space in the reaction assembly and increase the concentration of the alkylene oxide in the gas phase space in the reaction assembly, so that the adjusted alkylene oxide concentration is increased, but the adjusted alkylene oxide concentration is ensured to be below the critical ignition point concentration of the corresponding alkylene oxide at the safe pressure below the critical ignition point concentration of the corresponding alkylene oxide. For example, the delivery flow rate can be adjusted to the maximum value allowed under the current conditions. In this way, the adjusted alkylene oxide concentration is ensured to be below the critical ignition point concentration of the corresponding alkylene oxide at the safe pressure below the critical ignition point concentration of the corresponding alkylene oxide, and the production efficiency is further improved.

[0110] In the third case, see step S108.

[0111] Step S108, in the case where the process total pressure is the same as the safe pressure , the alkylene oxide is delivered to the reaction assembly at the first delivery flow rate.

[0112] In the case where the process total pressure is equal to the safe pressure , it indicates that the current concentration of the alkylene oxide is appropriate, and in this case, the first delivery flow rate does not need to be adjusted, and the alkylene oxide can continue to be delivered to the reaction assembly at the first delivery flow rate.

[0113] In the first case, the second conveying flow rate is less than the first conveying flow rate; in the second case, the third conveying flow rate is greater than the first conveying flow rate. The embodiments of the present application do not limit the specific implementation of the adjustment of the conveying flow rate. For example, the controller 3, the flow control valve 21 and the pressure detection device 14 can form a closed control loop, and a corresponding relationship between the safety pressure and the conveying flow rate can be constructed in advance by using simulation experiments or the like. Then, the safety pressure calculated above can be taken as the input of the controller 3, the controller 3 calculates the conveying flow rate corresponding to the input safety pressure by using the corresponding relationship between the safety pressure and the conveying flow rate constructed in advance, and controls the flow control valve 21 to adjust the conveying flow rate to the calculated conveying flow rate. In the first case, the second conveying flow rate is less than the first conveying flow rate; in the second case, the third conveying flow rate is greater than the first conveying flow rate. The embodiments of the present application do not limit the specific implementation of the adjustment of the conveying flow rate. For example, the controller 3, the flow control valve 21 and the pressure detection device 14 can form a closed control loop, and a corresponding relationship between the safety pressure and the conveying flow rate can be constructed in advance by using simulation experiments or the like. Then, the safety pressure calculated above can be taken as the input of the controller 3, the controller 3 calculates the conveying flow rate corresponding to the input safety pressure by using the corresponding relationship between the safety pressure and the conveying flow rate constructed in advance, and controls the flow control valve 21 to adjust the conveying flow rate to the calculated conveying flow rate.

[0114] It should be noted that in the reaction process of the current production batch, the above steps S101 to S108 can be executed cyclically to dynamically adjust the conveying flow rate according to the pressure change of the gas phase space in the reaction assembly, so that the alkylene oxide concentration is always below the ignition point concentration under the corresponding pressure condition, thereby ensuring the intrinsic safety of the reaction process.

[0115] The embodiments of the present application also provide a controller, which can include a memory and a processor, the memory storing a computer program, and the program being executed by the processor to implement the control method provided by the above embodiments.

[0116] The embodiments of the present application also provide an alkylene oxide ring-opening reaction method, which can be applied to the alkylene oxide ring-opening reaction device provided by the embodiments of the present application. As shown in the figure, the method can include the following steps: Figure 5 Step S201: adding the required starting agent, catalyst and protective gas for the current production batch into the reaction assembly.

[0117] Step S202: conveying the alkylene oxide into the reaction assembly through the alkylene oxide conveying channel.

[0118] Step S203: in the process of the cyclic treatment of heat exchange of the substances in the reaction assembly through the heat exchange assembly, the alkylene oxide reacts to generate the target product in the presence of the protective gas and the catalyst.

[0119] In the implementation process of the above step S202, the pressure detection device can be used to detect the pressure of the gas phase space in the reaction assembly, and the conveying flow rate of the alkylene oxide is dynamically adjusted based on the pressure.

[0120] In this way, the alkylene oxide ring-opening reaction method provided by the embodiments of the present application dynamically adjusts the conveying flow rate of the alkylene oxide through the pressure detection device and the controller in the reaction process, so that the alkylene oxide concentration is always below the ignition point concentration under the corresponding pressure condition, thereby ensuring the intrinsic safety of the production process. ​

[0121] It should be noted that the specific implementation method of step S202 and step S203 can refer to the description of the alkylene oxide ring opening reaction device embodiment and the alkylene oxide conveying flow control method embodiment, which will not be repeated here.

[0122] It should also be noted that the heat exchange assembly can include a first heat exchange assembly and / or a second heat exchange assembly.

[0123] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the difference from other embodiments. In this article, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the term "includes", "contains" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. The above terms can be understood according to the specific meaning in the application by those skilled in the art. It should be noted that the embodiments and features in the embodiments can be combined with each other without conflict. The application is not limited to any single aspect or any single embodiment, nor is it limited to any combination and / or permutation of aspects and / or embodiments. Moreover, each aspect and / or embodiment of the application can be used alone or in combination with one or more other aspects and / or embodiments.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application, and they should be covered in the scope of the claims and the specification of the application.

Claims

1. A method for controlling the flow rate of alkylene oxide, characterized in that: The method comprises: Delivering alkylene oxide to a reaction assembly at a first delivery rate; the reaction assembly is pre-added with an initiator, a catalyst, and a protective gas required for a current production batch, so that the alkylene oxide and the initiator react to produce a target product under the protective atmosphere provided by the protective gas and the catalytic action of the catalyst; Determine the The concentration of alkylene oxide in the gas phase space in the reaction component at the moment and the process total pressure of the gas phase space; The time is any time during the process of delivering the alkylene oxide required for the current production batch to the reaction component; Determining a safe pressure corresponding to the alkylene oxide concentration based on a pre-established relationship between pressure and critical ignition point concentration of the alkylene oxide; When the process total pressure is greater than the safety pressure, determining a second delivery flow rate based on the safety pressure; The first delivery flow rate is adjusted to the second delivery flow rate, and the alkylene oxide is continued to be delivered to the reaction component at the second delivery flow rate, so that the alkylene oxide concentration in the gas phase space in the reaction component is reduced to below the critical ignition point concentration of the alkylene oxide corresponding to the safety pressure.

2. The method according to claim 1, characterized in that The method further comprises: When the process total pressure is less than the safety pressure, determining a third delivery flow rate based on the safety pressure; adjusting the first delivery flow rate to the third delivery flow rate, and continuing to deliver the alkylene oxide to the reaction component at the third delivery flow rate, so that the concentration of the alkylene oxide in the gas phase space within the reaction component is increased and is below the critical ignition point concentration of the alkylene oxide corresponding to the safety pressure; When the total process pressure is equal to the safety pressure, the alkylene oxide is continuously delivered to the reaction component at the first delivery flow rate.

3. The method according to claim 1 or 2, characterized in that The determination of The concentration of alkylene oxide in the gas phase space within the reaction component at a certain moment includes: Determine the The process partial pressure of the protective gas in the gas phase space of the reaction component at a certain moment; Based on the process partial pressure and the process total pressure, the first The concentration of alkylene oxide in the gas phase space at the time.

4. The method according to claim 3, characterized in that The determination of The process partial pressure of the protective gas in the gas phase space of the reaction component at a certain moment includes: Determine the deadline The cumulative mass of alkylene oxide delivered to the reaction component at the time The process temperature in the reaction component at the time; Using the first relation, calculate The density of the liquid material in the reaction component at the moment, the first relationship is: ； in, Indicates the The density of the liquid material in the reaction component at the moment, represents the density of the initiator in the reaction assembly, Indicates the density of the target product corresponding to the current production batch; Indicates the end of The cumulative mass of alkylene oxide delivered to the reaction component at the time, Indicates the total mass of alkylene oxide required for the current production batch, Indicates the total mass of the starting agent required for the current production batch; Using the second relation, calculate The process partial pressure of the protective gas in the gas phase space at the moment, the second relationship is: ； in, Indicates the The process partial pressure of the protective gas in the gas phase space at this moment, It represents the initial partial pressure of the protective gas in the gas phase space under the initial conditions; represents the volume of the reaction component, Indicates the The process temperature in the reaction component at the time, represents the initial temperature in the reaction assembly under the initial conditions; the initial conditions refer to the addition of the initiator, catalyst and protective gas into the reaction assembly, and the absence of the alkylene oxide.

5. The method according to claim 3, characterized in that The reaction assembly is equipped with a protective gas pressure detection device; The determination of The process partial pressure of the protective gas in the gas phase space of the reaction component at a certain moment includes: Get the The pressure value detected by the protective gas pressure detection device at the moment; The pressure value is determined as The process partial pressure of the protective gas in the gas phase space of the reaction component at this moment.

6. The method according to claim 3, characterized in that The process partial pressure and the process total pressure are used to determine the first The concentration of alkylene oxide in the gas phase space at the time comprises: Using the third relationship, calculate the The concentration of alkylene oxide in the gas phase space at the moment, the third relationship is: in, Indicates the The concentration of alkylene oxide in the gas phase space at the moment, represents the total pressure of the process, represents the process partial pressure.

7. The method according to claim 1, characterized in that The reaction assembly is equipped with an alkylene oxide concentration detection device; The determination of The concentration of alkylene oxide in the gas phase space within the reaction component at a certain moment includes: Get the The alkylene oxide concentration detected by the alkylene oxide concentration detection device at the moment; The alkylene oxide concentration is determined as The concentration of alkylene oxide in the gas phase space within the reaction component at this moment.

8. The method according to claim 1, characterized in that The determining of the safety pressure corresponding to the alkylene oxide concentration based on the pre-established corresponding relationship between pressure and critical ignition point concentration of alkylene oxide includes: The method further comprises determining the maximum pressure that the alkylene oxide concentration can withstand based on the pre-established corresponding relationship between pressure and critical ignition point concentration of the alkylene oxide; Based on the maximum pressure and a preset safety factor, a safety pressure corresponding to the alkylene oxide concentration is determined.

9. A controller, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the program is executed by the processor, the method according to any one of claims 1 to 8 can be implemented.

10. An alkylene oxide ring-opening reaction device, characterized in that: include: React components; an alkylene oxide delivery channel, connected to the reaction assembly, and configured to deliver alkylene oxide to the reaction assembly; the reaction assembly is pre-added with an initiator, a catalyst, and a protective gas required for a current production batch, so that the alkylene oxide and the initiator react to produce a target product under the protective atmosphere provided by the protective gas and the catalytic action of the catalyst; a flow control valve, disposed on the alkylene oxide delivery channel and configured to adjust the delivery flow of the alkylene oxide; a pressure detection device configured to detect the pressure of the gas phase space within the reaction component; The controller according to claim 9, connected to the flow control valve and the pressure detection device.

11. A ring-opening reaction method for alkylene oxide, characterized in that: include: Add the initiator, catalyst and protective gas required for the current production batch into the reaction assembly; delivering alkylene oxide into the reaction component through an alkylene oxide delivery channel; During the heat exchange cycle treatment of the material in the reaction component by the heat exchange component, the alkylene oxide is reacted in the presence of the protective gas and the catalyst to generate the target product; In the process of delivering alkylene oxide to the reaction component through the alkylene oxide delivery channel, a pressure detection device is used to detect the pressure of the gas phase space in the reaction component, and the delivery flow rate of the alkylene oxide is dynamically adjusted according to the method according to any one of claims 1 to 8.

12. The ring-opening reaction method according to claim 11, characterized in that The controller according to claim 9 is used to implement the control method according to any one of claims 1 to 8 to dynamically adjust the delivery flow rate of alkylene oxide.

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