Ethylene oxide ring-opening catalytic polymerization system

Abstract

The utility model discloses an ethylene oxide open-loop catalytic polymerization system which comprises a catalyst preparation tank, an ethylene oxide gasification heating tank, a reaction kettle, a drying device and an automatic packaging machine, the catalyst preparation tank and the ethylene oxide gasification heating tank are used for being connected with the reaction kettle, and the discharging end of the reaction kettle is connected with the drying device. The drying equipment is used for being connected with an automatic packaging machine; according to the utility model, a plurality of structures such as the catalyst preparation tank, the ethylene oxide gasification heating tank, the reaction kettle, the drying equipment and the automatic packaging machine are combined, the catalyst metering pump is arranged between the catalyst preparation tank and the reaction kettle, and a catalyst is quantitatively conveyed into the reaction kettle through the catalyst metering pump; quantitative feeding of the catalyst is achieved through the catalyst metering pump, implosion after one-time feeding of the catalyst can be avoided, uncontrollable technological parameters can be avoided, and meanwhile the situation that due to uneven dispersion of the catalyst, product particles are too large, and part of the catalyst cannot completely intervene in a polymerization reaction is avoided.

Description

Technical Field

[0001] This utility model relates to the field of ethylene oxide ring-opening catalytic polymerization technology, specifically to an ethylene oxide ring-opening catalytic polymerization system. Background Technology

[0002] Existing ethylene oxide ring-opening catalytic polymerization systems have the following drawbacks during use:

[0003] 1. The temperature inside the reactor is uncontrollable, which affects the reaction effect inside the reactor.

[0004] 2. The amount of catalyst is uncontrollable. The explosive polymerization after the catalyst is added once makes the process parameters uncontrollable. It also leads to uneven catalyst dispersion, resulting in excessively large product particles and some catalysts failing to fully participate in the polymerization reaction.

[0005] Therefore, the development of a ring-opening catalytic polymerization system for ethylene oxide has become a pressing issue for society as a whole. Utility Model Content

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: an ethylene oxide ring-opening catalytic polymerization system, comprising a catalyst preparation tank, an ethylene oxide gasification heating tank, a reaction vessel, a drying device, and an automatic packaging machine, wherein the catalyst preparation tank and the ethylene oxide gasification heating tank are connected to the reaction vessel, the discharge end of the reaction vessel is connected to the drying device, and the drying device is connected to the automatic packaging machine;

[0007] The catalyst preparation tank is connected to a molecular sieve and a solvent pump, and the solvent pump is used to quantitatively deliver solvent into the reactor.

[0008] A catalyst metering pump is installed between the catalyst preparation tank and the reactor to quantitatively deliver the catalyst into the reactor.

[0009] The reactor is equipped with a pressure regulating valve at the top, and the ethylene oxide vaporization heating tank is equipped with a liquid level interlock and a pressure interlock.

[0010] Furthermore, the catalyst preparation tank is provided with a solid catalyst feeding port at the top, a flow meter and a shut-off valve are installed on the catalyst preparation tank, a pressure relief valve is installed on the ethylene oxide gasification heating tank, and the pressure transmitter is interlocked with the pressure relief valve.

[0011] Furthermore, the ethylene oxide vaporization heating tank is connected to a jacket and uses hot water heating to vaporize ethylene oxide.

[0012] Furthermore, the reactor is equipped with an over-temperature and over-pressure interlock, and a discharge valve is provided at the bottom of the reactor, through which the reactor enters the drying equipment.

[0013] The advantages of the utility model compared to the prior art are:

[0014] This invention combines multiple structures, including a catalyst preparation tank, an ethylene oxide gasification heating tank, a reaction vessel, a drying device, and an automatic packaging machine. A catalyst metering pump is installed between the catalyst preparation tank and the reaction vessel to quantitatively deliver catalyst into the reaction vessel. This quantitative catalyst feeding avoids explosive polymerization of the catalyst after a single addition, which would make the process parameters uncontrollable. It also avoids uneven catalyst dispersion, which could lead to excessively large product particles or some catalyst failing to fully participate in the polymerization reaction.

[0015] This invention employs an over-temperature and over-pressure interlock in the reactor, which can control the reactor temperature within a controllable range, ensuring that the internal temperature meets the reaction requirements. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an ethylene oxide ring-opening catalytic polymerization system according to the present invention. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings.

[0018] The present invention will be described in detail with reference to the accompanying drawings.

[0019] In a specific implementation, this utility model provides an ethylene oxide ring-opening catalytic polymerization system, including a catalyst preparation tank V-01, an ethylene oxide gasification heating tank V-02, a reaction vessel R-01, a drying device R-02, and an automatic packaging machine C-01. The catalyst preparation tank V-01 and the ethylene oxide gasification heating tank V-02 are connected to the reaction vessel R-01. The discharge end of the reaction vessel R-01 is connected to the drying device R-02, and the drying device R-02 is connected to the automatic packaging machine C-01.

[0020] The catalyst preparation tank V-01 is connected to a molecular sieve ST-01 and a solvent pump, which quantitatively delivers solvent into the reactor R-01 through the solvent pump.

[0021] A catalyst metering pump P-01 is installed between the catalyst preparation tank V-01 and the reactor R-01, and the catalyst is meteredly delivered into the reactor R-01 through the catalyst metering pump P-01.

[0022] The reactor R-01 is equipped with a pressure regulating valve PV-01 at its top, and the ethylene oxide gasification heating tank V-02 is equipped with a liquid level interlock and a pressure interlock.

[0023] Example:

[0024] When this utility model is in use, upon reaching the triggering condition, it simultaneously closes the ethylene oxide feed valve HV-04, opens the vent valve HV-05, and opens the chilled water valve HV-06, providing a rapid response and quickly restoring the reactor temperature and pressure to a controllable range.

[0025] After the catalyst is evaluated in a pilot-scale device and its activity and molecular weight range are determined, the catalyst metering pump P-01 is given a set frequency based on the temperature and pressure change trend and rate of the reactor. The catalyst is continuously added to avoid explosive polymerization after the catalyst is added once, which would make the process parameters uncontrollable. It also avoids uneven catalyst dispersion, which would result in excessively large product particles and some catalyst not being fully involved in the polymerization reaction.

[0026] After ethylene oxide is heated and vaporized in the V-02 gasification heating tank, it enters the reactor at a constant pressure (0.1MPa). The pressure is continuously fed by adjusting the pressure regulating valve PV-01 through the reactor pressure PIS-04 (reactor pressure controlled at 0.04MPa).

[0027] The ethylene oxide vaporization heating tank V-02 is equipped with a liquid level interlock. When the set liquid level is reached, the HV-02 feed valve is closed. At the same time, the tank is equipped with an overpressure protection device. A pressure transmitter PT-01 and a pressure relief valve HV-03 are installed on the ethylene oxide vaporization heating tank V-02. The pressure transmitter PT-01 and the pressure relief valve HV-03 are interlocked. When the tank pressure exceeds the set value, HV-03 is opened, and the gaseous ethylene oxide returns to the storage tank, ensuring that the tank pressure is within the safe process parameters.

[0028] The reactor temperature is controlled by the refrigerant return water regulating valves TV-02 / 03. TV-02 / 03 uses split-range control. In the initial stage of the reaction, due to the slow temperature rise rate and small valve opening, a small-diameter valve is used to control the refrigerant water flow. In the middle and later stages, when the reaction is more intense, a large-diameter valve is used to control the refrigerant water flow, ensuring stable reactor temperature control throughout the entire reaction cycle. At the same time, considering the possibility of an accident, both regulating valves are opened simultaneously, and the shut-off valve HV-06 is opened to achieve rapid cooling.

[0029] After the reaction is complete, the product is aged for 4 hours. The product is then discharged from the reactor R-01 through the discharge valve into the drying equipment R-02 for complete separation of the product and solvent. The solvent is recovered into the solvent tank and then distilled for later use. The product then enters the automatic packaging machine C-01 to begin the packaging process.

[0030] The specific process flow of this utility model is as follows:

[0031] 1) Catalyst preparation process: First, the solvent is added to the catalyst preparation tank V-01 through the flow interlock valve, and then the bottled solid catalyst is put into the tank for later use.

[0032] 2) Ethylene oxide is pumped to the ethylene oxide vaporization heating tank V-02, and the tank top pressure and liquid phase temperature are controlled by cascade control of the tank top pressure and liquid phase temperature;

[0033] 3) A metered amount of solvent is delivered to reactor R-01 via a solvent delivery pump, and a metered amount of catalyst is delivered to reactor P-01 via a catalyst metering pump. The pressure at the top of reactor R-01 and the feed rate are controlled by adjusting the regulating valve P-01 according to the pressure inside the reactor. The molecular weight is controlled by the amount of catalyst supplied through online sampling.

[0034] Among them, the catalyst preparation tank V-01 can achieve quantitative solvent cut-off, the ethylene oxide gasification heating tank V-02 is pressure-maintaining and controlled, and the tank top pressure and tank internal temperature are cascaded controlled.

[0035] As a further description of this utility model, a solid catalyst feeding port is provided at the top of the catalyst preparation tank V-01, a pressure transmitter PT-01 is installed on the catalyst preparation tank V-01, and a pressure relief valve HV-03 is installed on the ethylene oxide gasification heating tank V-02. The pressure transmitter PT-01 and the pressure relief valve HV-03 are interlocked.

[0036] As a further explanation of this utility model, the ethylene oxide gasification heating tank V-02 is connected with a jacket and uses hot water heating to gasify ethylene oxide.

[0037] As a further description of this utility model, the reactor R-01 adopts an over-temperature and over-pressure interlock, and a discharge valve is provided at the bottom of the reactor R-01. The reactor R-01 enters the drying equipment R-02 through the discharge valve.

[0038] The SIS system employs an OR logic interlock between temperature TICS-03 / 04 / 05 and reactor pressure PIS-03, with a two-out-of-three temperature selection to enhance system safety. Specifically, reaction R-01 is an over-temperature / over-pressure interlock (a two-out-of-three temperature selection TE-03 / 04 / 05 OR logic interlock with reactor PT-03. Upon triggering, HV-04 shuts off feed, HV-05 opens the vent, and HV-06 opens the refrigerant return water.)

[0039] As a further explanation of this utility model, the temperature of the reactor R-01 is controlled by the first refrigerant return water regulating valve TV-02 and the second refrigerant return water regulating valve TV-03, and the first refrigerant return water regulating valve TV-02 and the second refrigerant return water regulating valve TV-03 adopt split-range control.

[0040] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A ring-opening catalytic polymerization system for ethylene oxide, characterized in that: The system includes a catalyst preparation tank (V-01), an ethylene oxide gasification heating tank (V-02), a reactor (R-01), a drying device (R-02), and an automatic packaging machine (C-01). The catalyst preparation tank (V-01) and the ethylene oxide gasification heating tank (V-02) are connected to the reactor (R-01). The discharge end of the reactor (R-01) is connected to the drying device (R-02), and the drying device (R-02) is connected to the automatic packaging machine (C-01). The catalyst preparation tank (V-01) is connected to a molecular sieve (ST-01) and a solvent pump, which quantitatively delivers solvent into the reactor (R-01). A catalyst metering pump (P-01) is installed between the catalyst preparation tank (V-01) and the reactor (R-01) to quantitatively deliver catalyst into the reactor (R-01); The reactor (R-01) is equipped with a pressure regulating valve (PV-01) at its top, and the ethylene oxide vaporization heating tank (V-02) is equipped with a liquid level interlock.

2. The ethylene oxide ring-opening catalytic polymerization system according to claim 1, characterized in that: The catalyst preparation tank (V-01) is equipped with a solid catalyst feeding port at its top. A flow meter and a shut-off valve are installed on the catalyst preparation tank (V-01). A pressure transmitter (PT-01) is installed on the ethylene oxide gasification heating tank (V-02). A pressure relief valve (HV-03) is installed on the ethylene oxide gasification heating tank (V-02). The pressure transmitter (PT-01) and the pressure relief valve (HV-03) are interlocked.

3. The ethylene oxide ring-opening catalytic polymerization system according to claim 1, characterized in that: The ethylene oxide vaporization heating tank (V-02) is connected to a jacket and uses hot water heating to vaporize ethylene oxide.

4. The ethylene oxide ring-opening catalytic polymerization system according to claim 1, characterized in that: The reactor (R-01) is equipped with an over-temperature and over-pressure interlock. A discharge valve is provided at the bottom of the reactor (R-01). The reactor (R-01) enters the drying equipment (R-02) through the discharge valve.

5. The ethylene oxide ring-opening catalytic polymerization system according to claim 4, characterized in that: The temperature of the reactor (R-01) is controlled by the first refrigerant return water regulating valve (TV-02) and the second refrigerant return water regulating valve (TV-03), which are controlled by split-range control.

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