Chlorination hydrolysis production device based on low-temperature evaporation principle

Abstract

The utility model discloses a low-temperature evaporation principle chlorination hydrolysis production device which comprises a low-temperature evaporator, a heating coil is connected to the low-temperature evaporator, a liquid outlet of the low-temperature evaporator is connected with a pipeline mixer through a first conveying assembly, and the pipeline mixer is connected with a liquid caustic soda head tank through a second conveying assembly. A gas outlet of the low-temperature evaporator is fixedly connected with a first pipeline, and the tail end of the first pipeline is connected with a heat exchanger. Through low-temperature evaporation, side reactions such as decomposition and polymerization of materials due to high temperature are avoided, high quality of final products is ensured, various indexes of the products are more stable and accord with corresponding standards, and compared with a traditional high-temperature evaporation method, low-temperature evaporation is realized by reducing the boiling point through vacuum negative pressure, so that the energy consumption is greatly reduced, and the production cost is reduced. And the production cost is reduced, and the production economy is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of chemical production especially relates to low temperature evaporation principle chlorination hydrolysis production device. BACKGROUND

[0002] In the production process of ethyl maltol and other chemical products, the continuous production of chlorination hydrolysis link has been the focus of the industry, and the mixture containing chloromethane, hydrogen chloride, methanol and target product will be produced after chlorination reaction. The traditional evaporation treatment method has many problems, for example, high temperature evaporation, large energy consumption, low production efficiency, and easy to cause material decomposition, polymerization and other side reactions, affecting product quality; the conventional evaporation mode is difficult to realize continuous production. Therefore, it is urgent to need a new technology and device which can efficiently, stably and environmentally treat such materials to realize continuous production. SUMMARY

[0003] The utility model discloses a low temperature evaporation principle chlorination hydrolysis production device to solve the shortcoming of prior art.

[0004] In order to realize the above-mentioned purpose, the utility model discloses a low temperature evaporation principle chlorination hydrolysis production device, including low temperature evaporator, the low temperature evaporator is connected with heating coil, the liquid outlet of low temperature evaporator is connected with pipeline mixer through first conveying component, the pipeline mixer is connected with liquid caustic soda high tank through second conveying component, the gas outlet of low temperature evaporator is fixedly connected with first pipe, the tail end of first pipe is connected with heat exchanger, the liquid outlet of heat exchanger is fixedly connected with second pipe, the tail end of second pipe is connected with methanol receiving groove, the methanol receiving groove, the outlet of methanol receiving groove is fixedly connected with third pipe, the tail end of third pipe is fixedly connected with falling film absorption tower, the vacuum component is connected on falling film absorption tower, the compression component is connected between heating coil and heat exchanger, the outlet of heating coil is fixedly connected with fourth pipe, the fourth pipe is connected with fifth pipe, the tail end of fifth pipe is fixedly connected with the import of heat exchanger, the import of low temperature evaporator is connected with liquid supply component.

[0005] As a further description of the above technical solution:

[0006] The first conveying component includes first conveying pump, the import of first conveying pump is fixedly connected with sixth pipe, the tail end of sixth pipe is fixedly connected with low temperature evaporator, the outlet of first conveying pump is fixedly connected with seventh pipe, the tail end of seventh pipe is fixedly connected with pipeline mixer, and the second flow meter is arranged on seventh pipe.

[0007] As a further description of the above technical solution:

[0008] The second conveying assembly comprises a second conveying pump, an eighth pipeline is fixedly connected to the inlet of the second conveying pump, the tail end of the eighth pipeline is fixedly connected with a liquid alkali high tank, a ninth pipeline is fixedly connected to the outlet of the second conveying pump, the tail end of the ninth pipeline is connected with a pipeline mixer, and a first flow meter is arranged on the ninth pipeline.

[0009] As a further description of the above technical solution:

[0010] The vacuum assembly comprises a vacuum pump, a tenth pipeline is fixedly connected to the inlet of the vacuum pump, the tail end of the tenth pipeline is fixedly connected with a vacuum buffer tank, an eleventh pipeline is connected to the vacuum buffer tank, and the tail end of the eleventh pipeline is connected with a falling film absorption tower.

[0011] As a further description of the above technical solution:

[0012] The compression assembly comprises a compressor, a twelfth pipeline is fixedly connected to the inlet of the compressor, the tail end of the twelfth pipeline is fixedly connected with a heat exchanger, a thirteenth pipeline is arranged on the twelfth pipeline, a fourteenth pipeline is fixedly connected to the outlet of the compressor, the tail end of the fourteenth pipeline is fixedly connected with the inlet of a heating coil, and the heating coil is connected between the heat exchanger.

[0013] As a further description of the above technical solution:

[0014] The liquid supply assembly comprises a chlorination microchannel reactor, a fifteenth pipeline is fixedly connected to the outlet of the chlorination microchannel reactor, the tail end of the fifteenth pipeline is fixedly connected with a third conveying pump, a sixteenth pipeline is fixedly connected to the outlet of the third conveying pump, and the tail end of the sixteenth pipeline is connected with the inlet of a low-temperature evaporator.

[0015] As a further description of the above technical solution:

[0016] An expansion valve, a pressure sensor and a temperature sensor are installed on the fourth pipeline, and a liquid level detector and a vacuum interface are installed on the low-temperature evaporator.

[0017] The low-temperature evaporation principle chlorination hydrolysis production device has the following beneficial effects:

[0018] 1、Compared with the prior art, the low-temperature evaporation principle chlorination hydrolysis production device avoids decomposition, polymerization and other side reactions of materials due to high temperature through low-temperature evaporation, ensures high quality of the final product, and makes various indexes of the product more stable and meet corresponding standards.

[0019] 2、Compared with the prior art, the low-temperature evaporation principle chlorination hydrolysis production device controls the discharge and collection of hydrogen chloride and methanol, facilitates reasonable recycling or proper environmental protection treatment of these substances, reduces pollutant emissions, is more in line with environmental protection requirements, and helps enterprises achieve green production. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The low-temperature evaporation principle chlorination hydrolysis production device provided by the present application is shown in the whole.

[0021] LEGEND:

[0022] 1, low-temperature evaporator; 2, compressor; 3, heat exchanger; 4, methanol receiving tank; 5, falling film absorption tower; 6, vacuum buffer tank; 7, vacuum pump; 8, pipeline mixer; 9, liquid alkali high tank; 10, expansion valve; 11, liquid level detector; 12, first flowmeter; 13, pressure sensor; 14, temperature sensor; 15, vacuum interface; 16, heating coil; 17, chlorination microchannel reactor; 18, thirteenth pipeline; 19, fifth pipeline; 20, first delivery pump; 21, second delivery pump. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] REFERENCE Figure 1 The low-temperature evaporation principle chlorination hydrolysis production device provided by the present application comprises a low-temperature evaporator 1, a heating coil 16 connected to the low-temperature evaporator 1, a pipeline mixer 8 connected to the liquid outlet of the low-temperature evaporator 1 through a first delivery assembly, the first delivery assembly comprising a first delivery pump 20, the inlet of the first delivery pump 20 being fixedly connected to a sixth pipeline, the distal end of the sixth pipeline being fixedly connected to the low-temperature evaporator 1, the outlet of the first delivery pump 20 being fixedly connected to a seventh pipeline, the distal end of the seventh pipeline being fixedly connected to the pipeline mixer 8, and a second flowmeter being arranged on the seventh pipeline.

[0025] The pipeline mixer 8 is connected to a liquid alkali high tank 9 through a second delivery assembly, the second delivery assembly comprising a second delivery pump 21, the inlet of the second delivery pump 21 being fixedly connected to an eighth pipeline, the distal end of the eighth pipeline being fixedly connected to the liquid alkali high tank 9, the outlet of the second delivery pump 21 being fixedly connected to a ninth pipeline, the distal end of the ninth pipeline being connected to the pipeline mixer 8, a first flowmeter 12 being arranged on the ninth pipeline, and an online pH meter being arranged on the pipeline mixer 8.

[0026] The gas outlet of the low-temperature evaporator 1 is fixedly connected with a first pipeline, the tail end of the first pipeline is connected with a heat exchanger 3, the liquid outlet of the heat exchanger 3 is fixedly connected with a second pipeline, the tail end of the second pipeline is connected with a methanol receiving tank 4, the outlet of the methanol receiving tank 4 is fixedly connected with a third pipeline, the tail end of the third pipeline is fixedly connected with a falling film absorption tower 5, the falling film absorption tower 5 is connected with a vacuum assembly, the vacuum assembly comprises a vacuum pump 7, the inlet of the vacuum pump 7 is fixedly connected with a tenth pipeline, the tail end of the tenth pipeline is fixedly connected with a vacuum buffer tank 6, the vacuum buffer tank 6 is connected with an eleventh pipeline, the tail end of the eleventh pipeline is connected with the falling film absorption tower 5.

[0027] A compression assembly is connected between the heating coil 16 and the heat exchanger 3, the compression assembly comprises a compressor 2, the inlet of the compressor 2 is fixedly connected with a twelfth pipeline, the tail end of the twelfth pipeline is fixedly connected with the heat exchanger 3, the twelfth pipeline is provided with a thirteenth pipeline 18, the outlet of the compressor 2 is fixedly connected with a fourteenth pipeline, the tail end of the fourteenth pipeline is fixedly connected with the inlet of the heating coil 16, and the heating coil 16 is connected with the heat exchanger 3.

[0028] The outlet of the heating coil 16 is fixedly connected with a fourth pipeline, the fourth pipeline is connected with a fifth pipeline 19, the tail end of the fifth pipeline 19 is fixedly connected with the inlet of the heat exchanger 3, the inlet of the low-temperature evaporator 1 is connected with a liquid supply assembly, the liquid supply assembly comprises a chlorination micro-channel reactor 17, the outlet of the chlorination micro-channel reactor 17 is fixedly connected with a fifteenth pipeline, the tail end of the fifteenth pipeline is fixedly connected with a third delivery pump, the outlet of the third delivery pump is fixedly connected with a sixteenth pipeline, the tail end of the sixteenth pipeline is connected with the inlet of the low-temperature evaporator 1, the fourth pipeline is provided with an expansion valve 10, a pressure sensor 13 and a temperature sensor 14, the low-temperature evaporator 1 is provided with a liquid level detector 11 and a vacuum interface 15, the vacuum interface 15 is connected with a vacuum system, a stable vacuum environment is created, the boiling point of the material is reduced, the material is uniformly heated under the combined action of vacuum negative pressure and low temperature, and hydrogen chloride and methanol are vaporized under the condition of low temperature.

[0029] Working principle:

[0030] The third delivery pump is started, so that the chlorination stock solution in the chlorination micro-channel reactor 17 enters the low-temperature evaporator 1, after the liquid level is controlled, the compressor 2 is automatically started, high-temperature and high-pressure refrigerant gas is discharged to heat the chlorination stock solution, the temperature of the stock solution is controlled, and a boiling state is maintained; hydrogen chloride and methanol in the material begin to vaporize, the gaseous mixture formed enters the heat exchanger 3, under the condition that the system is stable, the flow rate of the chlorination stock solution entering the low-temperature evaporator 1 and the flow rate of the liquid out of the low-temperature evaporator 1 are stable, the liquid level, the pressure of the low-temperature evaporator 1 and the load of the compressor are stable.

[0031] The refrigerant, after passing through the expansion valve 10, is reduced in pressure and can circulate to cool the hydrogen chloride and methanol gas evaporated from the low-temperature evaporator 1, and the cooled methanol is converted from gas to liquid. Another part of the refrigerant can enter the chlorination micro-channel reactor 17 (not shown in the figure) to cool the methanol aqueous solution, and the refrigerant is returned to the compressor 2. After being heated in the compressor 2, the refrigerant is used to heat the raw liquid again, so as to circulate repeatedly (the refrigerant in the chlorination micro-channel reactor 17 is returned to the compressor 2 through the thirteenth pipeline 18, which is not shown in the figure).

[0032] The methanol receiving tank 4 is connected to the liquid outlet of the heat exchanger 3. The liquid methanol enters the methanol receiving tank 4, and the methanol receiving tank 4 is emptied into the falling film absorption tower 5 to absorb hydrogen chloride gas, thereby obtaining by-product hydrochloric acid. The gas phase (a small amount of uncondensed gas, etc.) can be further treated (alkali washing tower) or discharged (in line with environmental protection requirements) through the gas phase outlet.

[0033] The remaining material in the low-temperature evaporator 1 (the material after the removal of hydrogen chloride and methanol) is continuously transported to the pipeline mixer 8 for neutralization and hydrolysis, so as to ensure the uninterrupted production process. The pipeline mixer 8 is arranged between the liquid alkali head tank 9 and the outlet of the low-temperature evaporator 1. The amount of liquid alkali added is controlled to maintain a certain proportion with the amount of liquid discharged from the low-temperature evaporator. The amount of liquid alkali added is adjusted by means of the online pH meter after the pipeline mixer 8, and the pH value of the mixed liquid is controlled to be between 2 and 3.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A chlorination hydrolysis production device based on low-temperature evaporation principle, comprising a low-temperature evaporator (1), characterized in that: The low-temperature evaporator (1) is connected to a heating coil (16). The liquid outlet of the low-temperature evaporator (1) is connected to a pipe mixer (8) through a first conveying assembly. The pipe mixer (8) is connected to a liquid alkali high-level tank (9) through a second conveying assembly. The gas outlet of the low-temperature evaporator (1) is fixedly connected to a first pipe. The end of the first pipe is connected to a heat exchanger (3). The liquid outlet of the heat exchanger (3) is fixedly connected to a second pipe. The end of the second pipe is connected to a methanol receiving tank (4). 4) The outlet of the methanol receiving tank (4) is fixedly connected to a third pipe, and the end of the third pipe is fixedly connected to a falling film absorption tower (5). A vacuum assembly is connected to the falling film absorption tower (5). A compression assembly is connected between the heating coil (16) and the heat exchanger (3). The outlet of the heating coil (16) is fixedly connected to a fourth pipe, and a fifth pipe (19) is connected to the fourth pipe. The end of the fifth pipe (19) is fixedly connected to the inlet of the heat exchanger (3). A liquid supply assembly is connected to the inlet of the low-temperature evaporator (1).

2. The low-temperature evaporation principle chlorination hydrolysis production apparatus according to claim 1, characterized in that: The first conveying assembly includes a first conveying pump (20), the inlet of the first conveying pump (20) is fixedly connected to a sixth pipe, the end of the sixth pipe is fixedly connected to a low-temperature evaporator (1), the outlet of the first conveying pump (20) is fixedly connected to a seventh pipe, the end of the seventh pipe is fixedly connected to a pipe mixer (8), and a second flow meter is provided on the seventh pipe.

3. The low-temperature evaporation principle chlorination hydrolysis production apparatus according to claim 1, characterized in that: The second conveying assembly includes a second conveying pump (21), the inlet of which is fixedly connected to an eighth pipe, the end of which is fixedly connected to a liquid alkali high-level tank (9), the outlet of which is fixedly connected to a ninth pipe, the end of which is connected to a pipe mixer (8), and a first flow meter (12) is installed on the ninth pipe.

4. The low-temperature evaporation principle chlorination hydrolysis production apparatus according to claim 1, characterized in that: The vacuum assembly includes a vacuum pump (7), the inlet of which is fixedly connected to a tenth pipe, the end of which is fixedly connected to a vacuum buffer tank (6), the vacuum buffer tank (6) is connected to an eleventh pipe, and the end of the eleventh pipe is connected to a falling film absorption tower (5).

5. The low-temperature evaporation principle chlorination hydrolysis production apparatus according to claim 1, characterized in that: The compression assembly includes a compressor (2), the inlet of which is fixedly connected to a twelfth pipe, the end of which is fixedly connected to a heat exchanger (3), a thirteenth pipe (18) is provided on the twelfth pipe, the outlet of which is fixedly connected to a fourteenth pipe, the end of which is fixedly connected to the inlet of a heating coil (16), and the heating coil (16) is connected to the heat exchanger (3).

6. The low-temperature evaporation principle chlorination hydrolysis production apparatus according to claim 1, characterized in that: The liquid supply assembly includes a chlorination microchannel reactor (17), the outlet of which is fixedly connected to a fifteenth pipe, the end of which is fixedly connected to a third delivery pump, the outlet of which is fixedly connected to a sixteenth pipe, and the end of which is connected to the inlet of a low-temperature evaporator (1).

7. The low-temperature evaporation principle chlorination hydrolysis production apparatus according to claim 1, characterized in that: An expansion valve (10), a pressure sensor (13), and a temperature sensor (14) are installed on the fourth pipeline, and a liquid level detector (11) and a vacuum interface (15) are installed on the low-temperature evaporator (1).

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