A production device and preparation method of diesel cetane number improver

Abstract

The present invention belongs to the technical field of diesel improver production, and in particular, relates to a diesel cetane number improver production equipment and a preparation method thereof, comprising a kettle body and a feed chamber and a reaction chamber arranged inside the kettle body, wherein the feed chamber is located above the reaction chamber, and further comprising: a feed unit, wherein the feed unit is arranged at the top of the feed chamber; a circulating infusion unit is arranged at the bottom of the kettle body, and the suction end of the circulating infusion unit is respectively connected to the feed chamber and the reaction chamber. The present invention can ensure that the raw materials can be evenly mixed during the preparation of isooctyl nitrate improver, improve the conversion rate and the purity of isooctyl nitrate, reduce the waste of raw materials, and has a fast feeding speed, convenient maintenance, convenient mass transfer, and is conducive to temperature balance. At the same time, it can reduce the waste of time as much as possible while ensuring that the isooctyl nitrate reacts completely.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel improver production, and in particular relates to production equipment and a preparation method of a diesel cetane number improver. Background Art

[0002] Diesel is an important fuel, and its cetane number affects its combustion performance. Special improvers can significantly improve the cetane number of diesel. During the preparation of the improver, it is necessary to use a special reaction container for reaction preparation.

[0003] At present, isooctyl nitrate is a commonly used and relatively mature diesel cetane number improver. During production, isooctyl alcohol, mixed acid (nitric acid and sulfuric acid), inert solvent, etc. need to be introduced into a reactor in a specific ratio, and the raw materials are uniformly mixed using the reactor, and reacted at a suitable temperature, such as the tower reactor for synthesizing diesel cetane number improver disclosed in patent announcement number CN220900409U;

[0004] There are currently two commonly used reaction methods for the preparation of isooctyl nitrate improver. One is to use a micro-tube reactor for continuous reaction. However, the capacity of a single pipeline unit to handle the reaction is limited, which affects the overall efficiency, and increasing the number of pipeline units will lead to a complex structure of the entire device. Secondly, the micro-tube has a small diameter and is easily blocked by impurities, solid particles or reaction products, resulting in system failures and production interruptions, and the maintenance cost of the device is high. The other is to use a traditional reactor for reaction preparation. However, the traditional reactor will result in uneven heat transfer (for example, there will be a significant difference between the raw material temperature at the center of the reactor and the raw material temperature at the edge), poor mass transfer effect, affecting the preparation purity of isooctyl nitrate, and it is difficult to ensure that the raw materials are evenly mixed and reacted only by stirring, the conversion rate is not high, and some raw materials are wasted. Summary of the invention

[0005] The purpose of the present invention is to provide a production device and a preparation method of a diesel cetane number improver in view of the above problems.

[0006] To achieve the above object, the present invention adopts the following technical scheme: a diesel cetane number improver production equipment, including a kettle body and a feed chamber and a reaction chamber arranged inside the kettle body, wherein the feed chamber is located above the reaction chamber, and further comprising:

[0007] A feeding unit, arranged at the top of the feeding chamber;

[0008] A circulating infusion unit is arranged at the bottom of the kettle body, and the suction end of the circulating infusion unit is respectively connected with the feed chamber and the reaction chamber;

[0009] A plurality of distribution units are arranged at each discharge end of the circulating infusion unit and distribute the liquid delivered by the circulating infusion unit to the inside of the feed chamber and the reaction chamber;

[0010] A plurality of heat exchange units are connected to the liquid outlet of each of the distribution units, and each heat exchange unit is connected to the reaction chamber;

[0011] A detection unit, connected to the circulating infusion unit;

[0012] A trigger prompt mechanism is arranged on the outer side wall of the kettle body, and the trigger prompt mechanism is powered on and works according to the electrical signal output by the detection unit;

[0013] A discharge pipe is connected to the circulating infusion unit, and an electric control valve is installed inside the discharge pipe;

[0014] A stirring mechanism is arranged inside the reaction chamber;

[0015] A temperature control unit is arranged on the outer wall of the kettle body and performs heat exchange between the feed chamber and the reaction chamber;

[0016] A controller is installed on the outer side wall of the kettle body, and the circulating infusion unit, the distribution unit, the heat exchange unit, the detection unit, the trigger prompt mechanism and the stirring mechanism are all electrically connected to the controller;

[0017] Each of the distribution units includes a non-magnetic insulating seat arranged on the outside of the kettle body, a liquid inlet groove is provided on the side wall of the non-magnetic insulating seat, and the liquid inlet groove is connected to the discharge end of the circulating infusion unit, a non-magnetic protective sleeve is provided inside the liquid inlet groove, and a plurality of blocking nets are fixedly installed inside the non-magnetic protective sleeve, an iron ring is fixedly inserted inside the side wall of the non-magnetic protective sleeve, an installation groove is provided inside the non-magnetic insulating seat at a position above the liquid inlet groove, an insulating rod is slidably provided inside the installation groove, and a magnetic block is fixedly connected to one end of the insulating rod close to the non-magnetic protective sleeve, and the magnetic block A non-magnetic spring is fixedly provided between the block and the groove wall of the installation groove, an infrared ranging probe is fixedly installed inside the installation groove at a position on the side of the insulating rod away from the magnetic block, a first return pipe and a second return pipe are fixedly connected to the groove wall on the side of the liquid inlet groove away from the non-magnetic protective sleeve, a second normally open solenoid valve is installed inside the first return pipe, and a second normally closed solenoid valve is installed inside the second return pipe, the controller controls the second normally open solenoid valve and the second normally closed solenoid valve to be energized and work according to the electrical signal output by the infrared ranging probe, and the first return pipe is connected to the feed chamber.

[0018] Preferably, the feeding unit includes an annular cover fixedly mounted on the upper cavity wall of the feeding cavity, the bottom of the annular cover is fixedly connected to a plurality of shunt pipes, the top of the kettle body is fixedly connected to an isooctyl alcohol inlet pipe connected to the annular cover, the top of the kettle body is also fixedly connected to a mixed acid inlet pipe and an inert solvent inlet pipe connected to the feeding cavity, a liquid level meter is fixedly mounted on the top of the kettle body, and the detection end of the liquid level meter is located inside the feeding cavity, and the liquid level meter is electrically connected to the controller.

[0019] Preferably, the circulating infusion unit includes a circulating pump fixedly installed at the bottom of the kettle body, the suction end of the circulating pump is fixedly connected to the reaction chamber with a suction pipe, and a first normally closed solenoid valve is installed inside the suction pipe, the lower end of the side wall of the feed chamber is fixedly connected to the suction pipe with multiple circulating pipes, and one end of each circulating pipe connected to the suction pipe is arranged below the first normally closed solenoid valve, and a first normally open solenoid valve is installed inside each of the circulating pipes, the liquid outlet end of the circulating pump is fixedly connected to a hollow disc, and the side wall of the hollow disc is fixedly plugged with multiple heat dissipation pipes, and the heat dissipation pipes are connected to the liquid inlet tank on the same side, the first normally closed solenoid valve, the circulating pump and the first normally open solenoid valve are all electrically connected to the controller, and the controller controls the first normally closed solenoid valve and the first normally open solenoid valve to energize and work according to the electrical signal output by the liquid level meter.

[0020] Preferably, each of the heat exchange units includes an insulated tube connected to the second return pipe, and two circular plates are installed inside the insulated tube, and the two circular plates are commonly fixed with a plurality of heating rods electrically connected to the controller, and the end faces of the two circular plates are provided with a plurality of staggered leakage holes, and the insulated tube and the reaction chamber are commonly fixed with a connecting tube.

[0021] Preferably, the detection unit includes a sealing box mounted on the outer wall of each heat dissipation tube, and each sealing box is connected to the heat dissipation tube, a pH detection probe is installed on the end face of each sealing box, and the detection end of each pH detection probe is arranged inside the sealing box on the same side, and each pH detection probe is electrically connected to the controller.

[0022] Preferably, the trigger prompt mechanism includes an air pump fixedly mounted on the outer wall of the kettle body, and the suction end of the air pump is fixedly connected to an air suction pipe, the air outlet end of the air pump is fixedly connected to an air box, the side wall of the air box is provided with a plurality of exhaust holes, and a fourth normally open solenoid valve is installed inside each exhaust hole, an air pressure switch is installed inside the air box, the air pump and the air pressure switch are electrically connected to a controller, and the controller controls the corresponding fourth normally open solenoid valve to be energized according to the electrical signal output by each pH detection probe.

[0023] Preferably, the temperature control unit comprises a lower jacket and an upper jacket, both of which are sleeved on the outside of the kettle body, the lower jacket corresponds to the position of the reaction chamber, and the upper jacket corresponds to the position of the feed chamber, the side wall of the lower jacket is fixedly connected with an insulation medium inlet pipe and an insulation medium outlet pipe, and the side wall of the upper jacket is fixedly connected with a cooling medium inlet pipe and a cooling medium outlet pipe.

[0024] Preferably, the air intake pipe is connected to the interior of the reaction chamber, a third normally closed solenoid valve is installed inside the air intake pipe, a branch intake pipe is fixedly inserted at a position of the pipe wall of the air intake pipe between the third normally closed solenoid valve and the air pump, and a third normally open solenoid valve is installed inside the branch intake pipe, and both the third normally closed solenoid valve and the third normally open solenoid valve are electrically connected to the controller.

[0025] A method for preparing a production device for a diesel cetane number improver, the method comprising the following steps:

[0026] S1, a mixed acid of nitric acid and sulfuric acid with a molar ratio of 2:1 is uniformly mixed in advance and introduced into the feed chamber through the mixed acid inlet pipe, and an inert solvent accounting for 30% of the volume of isooctyl alcohol is introduced into the feed chamber through the inert solvent inlet pipe, and then isooctyl alcohol with a molar ratio of 1:1.3 to nitric acid is introduced into the annular cover through the isooctyl alcohol inlet pipe;

[0027] S2. When isooctyl alcohol is introduced into the annular cover, the controller is started at the same time, and the external cooling medium output device and the heat preservation medium output device are started at the same time, so that the cooling medium output device conveys the cooling medium into the upper jacket through the cooling medium inlet pipe, and the heat preservation medium output device conveys the heat preservation medium into the lower jacket;

[0028] S3. After the controller is started, it will control the circulation infusion unit, the distribution unit, the heat exchange unit and the stirring mechanism to work. The heating temperature of the heating rod in the heat exchange unit is 40°C to 50°C.

[0029] S4. After the controller receives the electrical signal output by the liquid level meter, the controller controls the first normally closed solenoid valve and the first normally open solenoid valve in the circulating infusion unit to be powered on, and controls the second normally open solenoid valve and the second normally closed solenoid valve in the distribution unit to remain powered on;

[0030] S5, the controller starts the detection unit and controls the trigger prompt mechanism to work according to the electrical signal output by the detection unit;

[0031] S6, after receiving the electrical signal output by the trigger prompt mechanism, the controller controls the circulating infusion unit, the heat exchange unit, the detection unit, the trigger prompt mechanism and the stirring mechanism to stop working;

[0032] S7, after standing for 20 minutes, the controller starts the circulation pump of the circulation infusion unit, and at the same time controls the electric control valve in the discharge pipe to open, and outputs the organic phase and the aqueous phase after stratification to the corresponding external containers for storage;

[0033] S8. Wash and dry the organic phase multiple times to remove impurities and residual acid in the organic phase, and obtain the isooctyl nitrate product after purification.

[0034] Compared with the existing technology, the advantages of a diesel cetane number improver production equipment and preparation method thereof are:

[0035] Through the mutual cooperation of the kettle body, the feed chamber, the reaction chamber, the feed unit, the circulating infusion unit and the distribution unit, the solution obtained by mixing isooctyl alcohol, the mixed acid and the inert solvent is circulated and detected, and the relatively uniformly mixed part of the solution is automatically separated into the reaction chamber, so as to ensure as much as possible that the mixing uniformity of the solution entering the reaction chamber is sufficient, so as to ensure that the raw materials can be evenly mixed during the preparation of isooctyl nitrate, improve the conversion rate and the purity of isooctyl nitrate, reduce the waste of raw materials, and compared with the continuous reaction mode of the microtube reactor, it has the advantages of fast feeding speed and convenient maintenance.

[0036] By setting up the heat exchange unit, it can be ensured that the relatively uniformly mixed raw materials can be fully heated to the appropriate reaction temperature before entering the reaction chamber, and in the process of the reaction cycle, the temperature balance of the mixed solution can be ensured as much as possible to prevent excessive temperature differences, improve the temperature stability of isooctyl nitrate in the preparation process, and have high mass transfer efficiency.

[0037] Through the cooperation of the detection unit and the trigger prompt mechanism, it is possible to automatically determine whether the reaction of the mixed solution is complete based on the pH value of the reaction solution during the circulation and transportation of the raw material reaction, thereby reducing time waste as much as possible while ensuring the complete reaction of isooctyl nitrate. At the same time, by cooperating with the third normally closed solenoid valve, the branch suction pipe and the third normally open solenoid valve, the air in the reaction chamber can be extracted before the reaction, thereby avoiding the air in the reaction chamber from affecting the reaction of the mixed solution as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a structural schematic diagram of a production device for a diesel cetane number improver provided by the present invention;

[0039] Figure 2 This is a partial structural schematic diagram of the interior of a kettle body of a diesel cetane number improver production device provided by the present invention;

[0040] Figure 3It is a structural schematic diagram of a circulating infusion unit of a diesel cetane number improver production device provided by the present invention;

[0041] Figure 4 It is a schematic diagram of the internal structure of a non-magnetic insulating seat of a diesel cetane number improver production device provided by the present invention;

[0042] Figure 5 This is a schematic diagram of the internal structure of a heat-insulated pipe of a diesel cetane number improver production device provided by the present invention;

[0043] Figure 6 It is a schematic diagram of the connection structure of a sealing box and a heat dissipation pipe of a production device for a diesel cetane number improver provided by the present invention;

[0044] Figure 7 This is a schematic diagram of the internal structure of the gas box in the first embodiment of a production device for a diesel cetane number improver provided by the present invention;

[0045] Figure 8 It is a schematic diagram of the internal structure of the gas box in Example 2 of a production device for a diesel cetane number improver provided by the present invention.

[0046] In the figure: 1 kettle body, 2 feed chamber, 3 reaction chamber, 4 feed unit, 41 annular cover, 42 shunt pipe, 43 isooctyl alcohol inlet pipe, 44 mixed acid inlet pipe, 45 inert solvent inlet pipe, 46 liquid level meter, 5 circulating infusion unit, 51 circulating pump, 52 suction pipe, 53 first normally closed solenoid valve, 54 circulating pipe, 55 first normally open solenoid valve, 56 hollow disc, 57 heat dissipation pipe, 6 distribution unit, 61 non-magnetic insulating seat, 62 liquid inlet tank , 63 non-magnetic protective sleeve, 64 blocking net, 65 iron ring, 66 installation groove, 67 insulating rod, 68 magnetic block, 69 non-magnetic spring, 610 infrared ranging probe, 611 first return pipe, 612 second return pipe, 613 second normally open solenoid valve, 614 second normally closed solenoid valve, 7 heat exchange unit, 71 insulation pipe, 72 round plate, 73 heating rod, 74 misaligned leakage hole, 75 connecting pipe, 8 detection unit, 81 sealing box, 82 pH detection probe, 9 trigger prompt mechanism, 91 air pump, 92 suction pipe, 93 air box, 94 exhaust hole, 95 fourth normally open solenoid valve, 96 air pressure switch, 10 discharge pipe, 11 stirring mechanism, 12 temperature control unit, 121 lower jacket, 122 upper jacket, 123 insulation medium inlet pipe, 124 insulation medium outlet pipe, 125 cooling medium inlet pipe, 126 cooling medium outlet pipe, 13 controller, 14 third normally closed solenoid valve, 15 suction pipe, 16 third normally open solenoid valve, 17 electric control valve. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Embodiment 1:

[0048] like Figure 1-Figure 7 As shown, a production device for a diesel cetane number improver comprises a kettle body 1 and a feed chamber 2 and a reaction chamber 3 arranged inside the kettle body 1, wherein the feed chamber 2 is located above the reaction chamber 3, and a stirring structure (not shown in the figure) is arranged inside the feed chamber 2 to assist in mixing the mixed solution inside the feed chamber 2, and further comprises: a feed unit 4, which is arranged on the top of the feed chamber 2, and the feed unit 4 comprises an annular cover 41 fixedly mounted on the upper cavity wall of the feed chamber 2, and the bottom of the annular cover 41 is fixedly connected to a plurality of shunt pipes 42, and the top of the kettle body 1 is fixedly plugged with An isooctyl alcohol inlet pipe 43 is connected to the annular cover 41, and a mixed acid inlet pipe 44 and an inert solvent inlet pipe 45 connected to the feed chamber 2 are fixedly connected to the top of the kettle body 1. A liquid level gauge 46 is fixedly installed on the top of the kettle body 1, and the detection end of the liquid level gauge 46 is located inside the feed chamber 2. The liquid level gauge 46 is electrically connected to the controller 13. The transmitting end of the liquid level gauge 46 emits infrared rays and calculates the time it takes for the receiving end to receive the reflected infrared rays, so as to measure the height of the liquid level in the feed chamber 2, and output an electrical signal to the controller 13 after the liquid level drops to a preset height.

[0049] The circulating infusion unit 5 is arranged at the bottom of the kettle body 1, and the suction end of the circulating infusion unit 5 is connected with the feed chamber 2 and the reaction chamber 3 respectively. The circulating infusion unit 5 includes a circulating pump 51 fixedly installed at the bottom of the kettle body 1, and the suction end of the circulating pump 51 is fixedly connected with the reaction chamber 3 together with a suction pipe 52, and a first normally closed solenoid valve 53 is installed inside the suction pipe 52. The lower end of the side wall of the feed chamber 2 is fixedly connected with the suction pipe 52 together with a plurality of circulating pipes 54, and one end of each circulating pipe 54 connected to the suction pipe 52 is arranged at the first normally closed solenoid valve 53. Below the valve 53, a first normally open solenoid valve 55 is installed inside each circulation pipe 54, the liquid outlet end of the circulation pump 51 is fixedly connected to a hollow disc 56, and a plurality of heat dissipation pipes 57 are fixedly connected to the side wall of the hollow disc 56. The first normally closed solenoid valve 53, the circulation pump 51 and the first normally open solenoid valve 55 are all electrically connected to the controller 13. The controller 13 controls the first normally closed solenoid valve 53 and the first normally open solenoid valve 55 to be energized and work according to the electrical signal output by the liquid level meter 46, and the heat dissipation pipe 57 is used to quickly dissipate excess heat of the mixed solution flowing through.

[0050] A plurality of distribution units 6 are arranged at each discharge end of the circulating infusion unit 5, and distribute the liquid transported by the circulating infusion unit 5 to the inside of the feed chamber 2 and the reaction chamber 3. Each distribution unit 6 includes a non-magnetic insulating seat 61 arranged on the outside of the kettle body 1, and a liquid inlet groove 62 is provided on the side wall of the non-magnetic insulating seat 61, and the liquid inlet groove 62 is connected to the heat dissipation pipe 57 on the same side, and a non-magnetic protective sleeve 63 is provided inside the liquid inlet groove 62, and a plurality of blocking nets 64 are fixedly installed inside the non-magnetic protective sleeve 63, and an iron ring 65 is fixedly inserted inside the side wall of the non-magnetic protective sleeve 63, and an installation groove 66 is provided inside the non-magnetic insulating seat 61 at a position above the liquid inlet groove 62, and an insulating rod 67 is slidably provided inside the installation groove 66, and a magnetic block 68 is fixedly connected to one end of the insulating rod 67 close to the non-magnetic protective sleeve 63, and a non-magnetic spring 69 is fixedly provided between the magnetic block 68 and the groove wall of the installation groove 66, and the interior of the installation groove 66 is located An infrared ranging probe 610 is fixedly installed at a position on the side of the insulating rod 67 away from the magnetic block 68, and a first return pipe 611 and a second return pipe 612 are fixedly inserted into the groove wall of the liquid inlet groove 62 away from the non-magnetic protective sleeve 63. A second normally open solenoid valve 613 is installed inside the first return pipe 611, and a second normally closed solenoid valve 614 is installed inside the second return pipe 612. The controller 13 controls the second normally open solenoid valve 613 and the second normally closed solenoid valve 614 to be energized and operate according to the electrical signal output by the infrared ranging probe 610. The first return pipe 611 is connected to the feed chamber 2. The transmitting end of the infrared ranging probe 610 can measure the distance between the infrared ranging probe 610 and the insulating rod 67 by emitting infrared rays and calculating the time it takes for the receiving end to receive the reflected infrared rays, and output an electrical signal to the controller 13 after the distance reaches the set value. This is an existing mature technology, so it will not be described here.

[0051] Multiple heat exchange units 7 are connected to the liquid outlet ends of each distribution unit 6, and each heat exchange unit 7 is connected to the reaction chamber 3. Each heat exchange unit 7 includes an insulated tube 71 connected to the second reflux pipe 612, and two circular plates 72 are installed inside the insulated tube 71. The two circular plates 72 are jointly fixed with multiple heating rods 73 electrically connected to the controller 13. The end faces of the two circular plates 72 are provided with multiple offset leakage holes 74. The insulated tube 71 and the reaction chamber 3 are jointly fixed with a connecting tube 75. The offset leakage holes 74 can allow the mixed solution to pass through, which is conducive to the mixed solution and the heating rods 73. Full contact.

[0052] The detection unit 8 is connected to the circulating infusion unit 5. The detection unit 8 includes a sealing box 81 which is sleeved on the outer wall of each heat dissipation tube 57, and each sealing box 81 is connected to the heat dissipation tube 57. A pH detection probe 82 is installed on the end face of each sealing box 81, and the detection end of each pH detection probe 82 is arranged inside the sealing box 81 on the same side. Each pH detection probe 82 is electrically connected to the controller 13. After detecting that the pH value reaches the set range, the pH detection probe 82 can output an electrical signal to the controller 13. This is an existing mature technology, so it will not be elaborated here.

[0053] The trigger prompt mechanism 9 is arranged on the outer wall of the kettle body 1, and the trigger prompt mechanism 9 is powered on and works according to the electrical signal output by the detection unit 8. The trigger prompt mechanism 9 includes an air pump 91 fixedly installed on the outer wall of the kettle body 1, and the suction end of the air pump 91 is fixedly connected to the suction pipe 92, and the air outlet end of the air pump 91 is fixedly connected to the air box 93. The side wall of the air box 93 is provided with a plurality of exhaust holes 94, and each exhaust hole 94 is internally installed with a fourth normally open solenoid valve 95, and the air pressure switch 96 is installed inside the air box 93. The air pump 91 and the air pressure switch 96 are both electrically connected to the controller 13. The controller 13 controls the corresponding fourth normally open solenoid valve 95 to be powered on according to the electrical signal output by each pH detection probe 82, wherein the side wall of the air box 93 is provided with an exhaust pipeline (not shown in the figure) connected to each exhaust hole 94, and the exhaust pipeline is provided with a plurality of outlet ends, which are respectively arranged at each heat dissipation pipe 57, for quickly dissipating the heat at each heat dissipation pipe 57 to ensure the continuous heat dissipation capacity of the heat dissipation pipe 57.

[0054] The discharge pipe 10 is connected to the circulating infusion unit 5, and an electric control valve 17 is installed inside the discharge pipe 10. The stirring mechanism 11 is arranged inside the reaction chamber 3, and the controller 13 is installed on the outer wall of the kettle body 1. The circulating infusion unit 5, the distribution unit 6, the heat exchange unit 7, the detection unit 8, the trigger prompt mechanism 9 and the stirring mechanism 11 are all electrically connected to the controller 13. The stirring mechanism 11 includes a driving motor, a casing, a bearing, a stirring shaft, a stirring blade and other components, which are used to quickly stir the mixed solution inside the reaction chamber 3.

[0055] The temperature control unit 12 is arranged on the outer wall of the kettle body 1 and performs heat exchange on the inside of the feed chamber 2 and the reaction chamber 3. The temperature control unit 12 includes a lower jacket 121 and an upper jacket 122. The lower jacket 121 and the upper jacket 122 are both sleeved on the outside of the kettle body 1. The lower jacket 121 corresponds to the position of the reaction chamber 3, and the upper jacket 122 corresponds to the position of the feed chamber 2. The side wall of the lower jacket 121 is fixedly connected with an insulation medium inlet pipe 123 and an insulation medium outlet pipe 124, and the side wall of the upper jacket 122 is fixedly connected with a cooling medium inlet pipe 125 and a cooling medium outlet pipe 126. The insulation medium inlet pipe 123 and the cooling medium inlet pipe 125 are respectively connected to the insulation medium output device and the cooling medium output device.

[0056] The operating principle of the present invention is described as follows: a mixed acid of nitric acid and sulfuric acid at a molar ratio of 2:1 is uniformly mixed in advance and then introduced into the feed chamber 2 through the mixed acid inlet pipe 44, and an inert solvent (toluene or xylene) accounting for 30% of the volume of isooctyl alcohol is introduced into the feed chamber 2 through the inert solvent inlet pipe 45, and then isooctyl alcohol at a molar ratio of 1:1.3 to nitric acid is introduced into the annular cover 41 through the isooctyl alcohol inlet pipe 43. After the isooctyl alcohol enters the annular cover 41, it will enter the feed chamber 2 from different positions through each branch pipe 42 and mix with the mixed acid and the inert solvent. When the isooctyl alcohol is introduced into the annular cover 41, the controller 13 is started at the same time, and the external cooling is started at the same time. The cooling medium output device and the heat preservation medium output device are used to transport the cooling medium into the upper jacket 122 through the cooling medium inlet pipe 125 (the temperature of the cooling medium is in the range of 1°C to 5°C, within which temperature range, the reaction rate of isooctyl alcohol and the mixed acid after mixing is low), and the heat preservation medium output device is used to transport the heat preservation medium into the lower jacket 121 (the temperature of the heat preservation medium is in the range of 40°C to 50°C, within which temperature range, it can be ensured that the reaction rate of isooctyl alcohol and the mixed acid after mixing is high), the cooling medium in the upper jacket 122 is discharged through the cooling medium outlet pipe 126, and the heat preservation medium in the lower jacket 121 is discharged through the heat preservation medium outlet pipe 124;

[0057] After the controller 13 is started, it will control the circulation pump 51 to start working, and the mixed solution inside the feed chamber 2 will enter the suction pipe 52 through each circulation pipe 54, and be input into the hollow disc 56 by the circulation pump 51, and then enter the liquid inlet tank 62 inside the non-magnetic insulating seat 61 through each heat dissipation pipe 57 on the side wall of the hollow disc 56. When the mixed solution passes through each blocking net 64 inside the liquid inlet tank 62, under the action of the flow resistance of the mixed solution, each blocking net 64 will be subjected to resistance and will drive the iron ring 65 to move synchronously through the non-magnetic protective sleeve 63. Due to the magnetic attraction between the iron ring 65 and the magnetic block 68, when the iron ring 65 moves, the magnetic block 68 will also move synchronously, thereby being able to drive the insulating rod 67 to move horizontally. If the mixed solution enters the liquid inlet tank 62, The mixed acid accounts for too much in the mixed solution. Since the mixed acid of nitric acid and sulfuric acid has a higher viscosity than isooctyl alcohol and an inert solvent, when the high-viscosity liquid flows in the pipeline, the internal friction between the molecules is large, resulting in an increase in flow resistance. Therefore, each blocking net 64 drives the iron ring 65 to move a large distance through the non-magnetic protective sleeve 63, thereby making the distance between the insulating rod 67 and the infrared ranging probe 610 closer. If the isooctyl alcohol and the inert solvent in the mixed solution entering the liquid inlet tank 62 account for too much, then since the viscosity of isooctyl alcohol and the inert solvent is smaller than that of the mixed acid, the flow resistance is smaller, so the moving distance of the blocking net 64 is smaller. At this time, the distance between the insulating rod 67 and the infrared ranging probe 610 is far. If the ratio of the mixed acid, isooctyl alcohol and inert solvent in the mixed solution is appropriate (the ratio is about 3:2.5:0.75), the flow resistance of the barrier net 64 is appropriate. At this time, the distance between the insulating rod 67 and the infrared ranging probe 610 is centered. After the controller 13 is started, the infrared ranging probe 610 will be started. The transmitting end of the infrared ranging probe 610 can measure the distance between the infrared ranging probe 610 and the insulating rod 67 by emitting infrared rays and calculating the time it takes for the receiving end to receive the reflected infrared rays. When the distance between the insulating rod 67 and the infrared ranging probe 610 is within the range of 4 cm to 6 cm (that is, the ratio of each raw material in the mixed solution is appropriate), the infrared ranging probe 610 will output an electrical signal to the controller 13. On the contrary, if the insulating rod When the distance between 67 and the infrared ranging probe 610 is outside the threshold range, the infrared ranging probe 610 will not output an electrical signal to the controller 13. After receiving the electrical signal output by the infrared ranging probe 610, the controller 13 will control the second normally open solenoid valve 613 and the second normally closed solenoid valve 614 to be energized. At this time, the mixed liquid in the liquid inlet tank 62 will be discharged through the second reflux pipe 612. If the controller 13 does not receive the electrical signal output by the infrared ranging probe 610, the second normally open solenoid valve 613 and the second normally closed solenoid valve 614 will not be energized. At this time, the mixed solution in the liquid inlet tank 62 will flow back into the feed chamber 2 through the first reflux pipe 611, thereby ensuring that the relatively uniformly mixed mixed solution enters the reaction chamber 3 for reaction;

[0058] When the mixed liquid discharged through the second reflux pipe 612 passes through the insulation pipe 71, it will be heated to a temperature within a range of 40°C to 50°C by each heating rod 73, so that the mixed liquid can reach the reaction temperature for rapid reaction. The heated mixed solution enters the reaction chamber 3 for reaction. At the same time, after the controller 13 is started, it will control the stirring mechanism 11 to work, and the stirring mechanism 11 can further stir and mix the mixed solution in the reaction chamber 3 to ensure that the mixed solution can fully react.

[0059] As the mixed solution in the feed chamber 2 is transferred into the reaction chamber 3, the amount of the mixed solution in the feed chamber 2 gradually decreases until the mixed solution in the feed chamber 2 is completely discharged. At this time, the liquid level meter 46 in the feed chamber 2 will detect that the mixed solution in the feed chamber 2 is completely discharged (the transmitting end of the liquid level meter 46 can measure the height of the liquid level in the feed chamber 2 by emitting infrared rays and calculating the time for the receiving end to receive the reflected infrared rays, and output an electrical signal to the controller 13 after the liquid level drops to a preset height), thereby outputting an electrical signal to the controller 13. After receiving the electrical signal output by the liquid level meter 46, the controller 13 will immediately control each first normally open solenoid valve 55 and the first normally closed solenoid valve 53 in the suction pipe 52 to be energized and work, and the controller 13 controls the second normally open solenoid valve 55 in the first reflux pipe 611 to be energized and work. The solenoid valve 613 and the second normally closed solenoid valve 614 in the second reflux pipe 612 are continuously energized, and at this time, the circulating pump 51 will extract the mixed solution in the reaction chamber 3, and cooperate with the hollow disc 56, the heat dissipation pipe 57, the liquid inlet tank 62, the second reflux pipe 612, the heat insulation pipe 71, the offset leakage hole 74 and the connecting pipe 75 to make the mixed solution in the reaction chamber 3 circulate. On the one hand, the mixed solution in the middle part of the reaction chamber 3 can be externally circulated. If the temperature of the mixed solution is too high, the excess heat can be dissipated through the heat dissipation pipe 57. If the temperature is too low, the temperature can be raised by the heating rod 73 to help improve the temperature stability of the mixed solution. On the other hand, through the circulation and the operation of the stirring mechanism 11, it can be ensured as much as possible that the mixed solution is evenly mixed and fully reacted.

[0060] Secondly, after receiving the output electrical signal of the liquid level meter 46, the controller 13 will start each pH detection probe 82 and start the air pump 91 at the same time. As the reaction proceeds, the mixed acid solution in the mixed solution is consumed by the reaction. At this time, the pH value of the mixed solution gradually increases. When the pH value of the mixed solution reaches a preset value (the preset value can be set according to the pH value of the mixed solution after the reaction is complete under the same conditions or obtained in production, usually set in the range of 3 to 4), the pH detection probe 82 will output an electrical signal to the controller 13. At this time, the controller 13 will control the fourth normally open solenoid valve 95 corresponding to the pH detection probe 82 to be energized. If only part of the mixed solution in the reaction chamber 3 fully reacts, only part of the pH detection probes 82 will output electrical signals to the controller 13, or all of the pH detection probes 82 will only output electrical signals to the controller 13 for a short time (within 3 minutes). At this time, the air delivered to the inside of the air box 93 by the air pump 91 can The mixed solution in the reaction chamber 3 is allowed to be discharged in time, and when the mixed solution in the reaction chamber 3 is fully reacted, each pH detection probe 82 will continue to output an electrical signal to the controller 13 for a long time. At this time, each fourth normally open solenoid valve 95 will continue to be energized and closed, so the air entering the air box 93 cannot be discharged in time. Under the action of air pressure, the moving contact of the air pressure switch 96 is closed by the air pressure, thereby outputting a closed electrical signal to the controller 13. At this time, the controller 13 will control the circulating infusion unit 5, the heat exchange unit 7, the detection unit 8, the trigger prompt mechanism 9 and the stirring mechanism 11 to stop working, and the mixed solution is allowed to stand and stratify in the reaction chamber 3. After standing and stratifying for 20 minutes, the controller 13 starts the circulating pump 51, and at the same time controls the electric control valve 17 in the discharge pipe 10 to open, and outputs the stratified organic phase and aqueous phase to the corresponding external containers for storage, and then washes and dries the organic phase for multiple times to remove impurities and residual acid in the organic phase, and obtains the isooctyl nitrate product after purification. Embodiment 2:

[0061] Reference Figure 8 The difference between this embodiment and the first embodiment is that: the air intake pipe 92 is connected to the interior of the reaction chamber 3, a third normally closed solenoid valve 14 is installed inside the air intake pipe 92, a branch suction pipe 15 is fixedly inserted at a position between the third normally closed solenoid valve 14 and the air pump 91 on the pipe wall of the air intake pipe 92, and a third normally open solenoid valve 16 is installed inside the branch suction pipe 15, and the third normally closed solenoid valve 14 and the third normally open solenoid valve 16 are both electrically connected to the controller 13.

[0062] In this embodiment, after the controller 13 is started, the controller 13 will control the air pump 91, the third normally open solenoid valve 16 and the third normally closed solenoid valve 14 to work regularly for 5 minutes. At this time, the suction end of the air pump 91 will discharge the air in the reaction chamber 3 through the suction pipe 92, thereby reducing the amount of air in the reaction chamber 3 and reducing the influence of the air on the reaction of isooctyl alcohol and the mixed acid. After starting the pH detection probe 82, the air pump 91 will input external air into the air box 93 through the suction pipe 15 and the suction pipe 92.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A production device for a diesel cetane number improver, comprising a kettle (1) and a feed chamber (2) and a reaction chamber (3) arranged inside the kettle (1), wherein the feed chamber (2) is located above the reaction chamber (3), and is characterized in that: Also includes: A feeding unit (4) is arranged at the top of the feeding chamber (2); A circulating liquid infusion unit (5) is arranged at the bottom of the kettle body (1), and the suction end of the circulating liquid infusion unit (5) is respectively connected to the feed chamber (2) and the reaction chamber (3); A plurality of distribution units (6) are arranged at each discharge end of the circulating infusion unit (5) and distribute the liquid transported by the circulating infusion unit (5) to the inside of the feed chamber (2) and the reaction chamber (3); A plurality of heat exchange units (7) are connected to the liquid outlet ends of the distribution units (6), and each heat exchange unit (7) is connected to the reaction chamber (3); A detection unit (8) connected to the circulating infusion unit (5); A trigger prompt mechanism (9) is arranged on the outer side wall of the kettle body (1), and the trigger prompt mechanism (9) is powered on and operates according to the electrical signal output by the detection unit (8); A discharge pipe (10) is connected to the circulating infusion unit (5), and an electric control valve (17) is installed inside the discharge pipe (10); A stirring mechanism (11) is arranged inside the reaction chamber (3); A temperature control unit (12) is arranged on the outer wall of the kettle body (1) and performs heat exchange between the feed chamber (2) and the reaction chamber (3); A controller (13) is mounted on the outer wall of the kettle body (1); the circulating infusion unit (5), the distribution unit (6), the heat exchange unit (7), the detection unit (8), the trigger prompt mechanism (9) and the stirring mechanism (11) are all electrically connected to the controller (13); Each of the distribution units (6) comprises a non-magnetic insulating seat (61) arranged on the outside of the kettle body (1); a liquid inlet groove (62) is provided on the side wall of the non-magnetic insulating seat (61), and the liquid inlet groove (62) is connected to the discharge end of the circulating infusion unit (5); a non-magnetic protective sleeve (63) is provided inside the liquid inlet groove (62), and a plurality of blocking nets (64) are fixedly installed inside the non-magnetic protective sleeve (63); an iron ring (65) is fixedly inserted inside the side wall of the non-magnetic protective sleeve (63); an installation groove (66) is provided inside the non-magnetic insulating seat (61) at a position above the liquid inlet groove (62); an insulating rod (67) is slidably provided inside the installation groove (66), and a magnetic block (68) is fixedly connected to one end of the insulating rod (67) close to the non-magnetic protective sleeve (63); the magnetic block (68) is connected to the non-magnetic protective sleeve (63). A non-magnetic spring (69) is fixedly provided between the groove walls of the installation groove (66); an infrared distance measuring probe (610) is fixedly installed inside the installation groove (66) at a position on the side of the insulating rod (67) away from the magnetic block (68); a first return pipe (611) and a second return pipe (612) are fixedly plugged into the groove wall on the side of the liquid inlet groove (62) away from the non-magnetic protective sleeve (63); a second normally open solenoid valve (613) is installed inside the first return pipe (611); a second normally closed solenoid valve (614) is installed inside the second return pipe (612); the controller (13) controls the second normally open solenoid valve (613) and the second normally closed solenoid valve (614) to be energized and operated according to an electrical signal output by the infrared distance measuring probe (610); and the first return pipe (611) is connected to the feed chamber (2); Each of the heat exchange units (7) comprises a heat-insulating tube (71) connected to the second return tube (612), and two circular plates (72) are installed inside the heat-insulating tube (71), and the two circular plates (72) are commonly fixedly plugged with a plurality of heating rods (73) electrically connected to the controller (13), and the end surfaces of the two circular plates (72) are each provided with a plurality of offset leakage holes (74), and the heat-insulating tube (71) and the reaction chamber (3) are commonly fixedly plugged with a connecting tube (75); The detection unit (8) comprises a sealing box (81) sleeved on the outer side wall of each heat dissipation tube (57), and each sealing box (81) is connected to the heat dissipation tube (57), and each end surface of each sealing box (81) is installed with a pH detection probe (82), and the detection end of each pH detection probe (82) is arranged inside the sealing box (81) on the same side, and each pH detection probe (82) is electrically connected to the controller (13); The trigger prompt mechanism (9) comprises an air pump (91) fixedly mounted on the outer wall of the kettle body (1), and the suction end of the air pump (91) is fixedly connected to an air suction pipe (92), and the air outlet end of the air pump (91) is fixedly connected to an air box (93), and the side wall of the air box (93) is provided with a plurality of exhaust holes (94), and each exhaust hole (94) is internally installed with a fourth normally open solenoid valve (95), and an air pressure switch (96) is internally installed in the air box (93), and the air pump (91) and the air pressure switch (96) are both electrically connected to a controller (13), and the controller (13) controls the corresponding fourth normally open solenoid valve (95) to be energized according to the electrical signal output by each pH detection probe (82).

2. The production equipment of a diesel cetane number improver according to claim 1, characterized in that: The feeding unit (4) comprises an annular cover (41) fixedly mounted on the upper cavity wall of the feeding cavity (2); a plurality of flow dividers (42) are fixedly connected to the bottom of the annular cover (41); an isooctyl alcohol inlet pipe (43) connected to the annular cover (41) is fixedly plugged into the top of the kettle body (1); a mixed acid inlet pipe (44) and an inert solvent inlet pipe (45) connected to the feeding cavity (2) are also fixedly plugged into the top of the kettle body (1); a liquid level meter (46) is fixedly mounted on the top of the kettle body (1); a detection end of the liquid level meter (46) is located inside the feeding cavity (2); and the liquid level meter (46) is electrically connected to the controller (13).

3. The production equipment of a diesel cetane number improver according to claim 2, characterized in that: The circulating infusion unit (5) comprises a circulating pump (51) fixedly mounted on the bottom of the kettle body (1); a suction pipe (52) is fixedly connected to the suction end of the circulating pump (51) and the reaction chamber (3); a first normally closed solenoid valve (53) is installed inside the suction pipe (52); a plurality of circulating pipes (54) are fixedly connected to the suction pipe (52) at the lower end of the side wall of the feed chamber (2); and one end of each circulating pipe (54) connected to the suction pipe (52) is arranged below the first normally closed solenoid valve (53); and a first normally closed solenoid valve (53) is installed inside each circulating pipe (54). A first normally open solenoid valve (55) is provided, the liquid outlet end of the circulation pump (51) is fixedly connected to a hollow disc (56), a plurality of heat dissipation pipes (57) are fixedly plugged into the side wall of the hollow disc (56), and the heat dissipation pipes (57) are connected to the liquid inlet groove (62) on the same side, the first normally closed solenoid valve (53), the circulation pump (51) and the first normally open solenoid valve (55) are all electrically connected to a controller (13), and the controller (13) controls the first normally closed solenoid valve (53) and the first normally open solenoid valve (55) to energize and operate according to an electrical signal output by a liquid level meter (46).

4. The production equipment of a diesel cetane number improver according to claim 3, characterized in that: The temperature control unit (12) comprises a lower jacket (121) and an upper jacket (122), the lower jacket (121) and the upper jacket (122) being sleeved on the outside of the kettle body (1), the lower jacket (121) corresponding to the position of the reaction chamber (3), the upper jacket (122) corresponding to the position of the feed chamber (2), a heat-insulating medium inlet pipe (123) and a heat-insulating medium outlet pipe (124) being fixedly plugged into the side wall of the lower jacket (121), and a cooling medium inlet pipe (125) and a cooling medium outlet pipe (126) being fixedly plugged into the side wall of the upper jacket (122).

5. The production equipment of a diesel cetane number improver according to claim 3, characterized in that: The air intake pipe (92) is connected to the interior of the reaction chamber (3), and a third normally closed solenoid valve (14) is installed inside the air intake pipe (92). A branch suction pipe (15) is fixedly inserted into the wall of the air intake pipe (92) between the third normally closed solenoid valve (14) and the air pump (91), and a third normally open solenoid valve (16) is installed inside the branch suction pipe (15). Both the third normally closed solenoid valve (14) and the third normally open solenoid valve (16) are electrically connected to the controller (13).

6. A method for preparing a diesel cetane number improver, using the diesel cetane number improver production equipment according to claim 4, characterized in that: The preparation method comprises the following steps: S1, a mixed acid of nitric acid and sulfuric acid at a molar ratio of 2:1 is uniformly mixed in advance and introduced into the feed chamber (2) through the mixed acid inlet pipe (44), and an inert solvent accounting for 30% of the volume of isooctyl alcohol is introduced into the feed chamber (2) through the inert solvent inlet pipe (45), and then isooctyl alcohol at a molar ratio of 1:1.3 to nitric acid is introduced into the annular cover (41) through the isooctyl alcohol inlet pipe (43); S2, when isooctyl alcohol is introduced into the annular cover (41), the controller (13) is started simultaneously, and the external cooling medium output device and the heat-insulating medium output device are started simultaneously, so that the cooling medium output device conveys the cooling medium into the upper jacket (122) through the cooling medium inlet pipe (125), and the heat-insulating medium output device conveys the heat-insulating medium into the lower jacket (121); S3, after the controller (13) is started, it controls the circulation infusion unit (5), the distribution unit (6), the heat exchange unit (7) and the stirring mechanism (11) to operate, and the heating temperature of the heating rod (73) in the heat exchange unit (7) is 40° C. to 50° C.; S4. After the controller (13) receives the electrical signal output by the liquid level meter (46), the controller (13) controls the first normally closed solenoid valve (53) and the first normally open solenoid valve (55) in the circulating infusion unit (5) to be energized and operated, and controls the second normally open solenoid valve (613) and the second normally closed solenoid valve (614) in the distribution unit (6) to remain energized and operated; S5, the controller (13) starts the detection unit (8), and controls the trigger prompt mechanism (9) to operate according to the electrical signal output by the detection unit (8); S6, after receiving the electrical signal output by the trigger prompt mechanism (9), the controller (13) controls the circulating infusion unit (5), the heat exchange unit (7), the detection unit (8), the trigger prompt mechanism (9) and the stirring mechanism (11) to stop working; S7, after standing for 20 minutes to separate the layers, the controller (13) starts the circulation pump (51) of the circulation infusion unit (5), and simultaneously controls the electric control valve (17) in the discharge pipe (10) to open, and outputs the separated organic phase and aqueous phase to corresponding external containers for storage; S8. Wash and dry the organic phase multiple times to remove impurities and residual acid in the organic phase, and obtain the isooctyl nitrate product after purification.

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