Phosgene synthesis device

Abstract

The utility model provides a phosgene synthesis device. The phosgene synthesis device comprises a carbon monoxide generation unit, a chlorine generation unit and a synthesis unit, the carbon monoxide generation unit comprises a carbon monoxide generation furnace, a dust removal and cooling device, an alkali washing desulfurization device, a gas holder, a carbon monoxide post-treatment device, an oxygen supply system for providing oxygen for the carbon monoxide generation furnace, an automatic coke adding device for providing coke for the carbon monoxide generation furnace, and a water supply system for providing water for the dust removal and cooling device which are connected in sequence; the alkali preparation system is used for providing alkali liquor for the alkali washing desulfurization device; the synthesis unit comprises a mixing tee joint, a phosgene synthesizer and a cleaning reactor which are connected in sequence; and two gas inlet ends of the mixing tee joint are respectively connected with a carbon monoxide gas outlet end of the carbon monoxide post-treatment device and a chlorine gas outlet end of the chlorine gas generation unit. According to the phosgene synthesis device disclosed by the utility model, each working section is reasonable in structural design and strong in continuity, the manual participation degree is effectively reduced, the labor intensity and the operation risk are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of phosgene synthesis, and particularly relates to a phosgene synthesis device. Background Art

[0002] Industrially, phosgene is usually manufactured using chlorine gas and carbon monoxide as raw materials and activated carbon as a catalyst in a phosgene reactor. Traditional phosgene synthesis devices generally include a carbon monoxide supply end, a chlorine gas supply end, and a phosgene synthesis end. Carbon monoxide provided by the carbon monoxide supply and chlorine gas provided by the chlorine gas supply are mixed and reacted at the phosgene synthesis end to prepare phosgene. However, due to unreasonable design of each section in the existing phosgene synthesis devices, the continuity is poor, resulting in high manual participation, high labor intensity, inconvenient operation, high operation risk, and low production efficiency. Content of the Utility Model

[0003] In view of this, to solve the above technical problems, the utility model provides a phosgene synthesis device with reasonable structural design of each section, strong continuity, which can effectively reduce manual participation, lower labor intensity and operation risk, and improve production efficiency.

[0004] To achieve the above object, the technical solution of the utility model is realized as follows:

[0005] A phosgene synthesis device, comprising:

[0006] A carbon monoxide generation unit, including a carbon monoxide generator, a dust removal and temperature reduction device, an alkali washing and desulfurization device, a gas holder, a carbon monoxide post-treatment device connected in sequence through pipelines, an oxygen supply system for providing oxygen to the carbon monoxide generator, an automatic coke adding device for providing coke to the carbon monoxide generator, a water supply system for providing spray water to the dust removal and temperature reduction device, and a caustic soda preparation system for providing caustic soda solution to the alkali washing and desulfurization device;

[0007] A chlorine gas generation unit;

[0008] A synthesis unit, including a mixing tee, a phosgene synthesizer connected to the gas outlet end of the mixing tee, and a purification reactor connected to the reaction gas mixture outlet end of the phosgene synthesizer; the two inlet ends of the mixing tee are respectively connected to the carbon monoxide outlet end of the carbon monoxide post-treatment device and the chlorine gas outlet end of the chlorine gas generation unit.

[0009] The oxygen provided by the oxygen supply system enters the furnace body through the oxygen nozzle of the carbon monoxide generator, reacts with the coke fed into the furnace body through the coke feed port of the carbon monoxide generator provided by the automatic coke feeding device to generate carbon monoxide, and the reaction heat generated is removed by heat exchange with the jacket cooling water of the carbon monoxide generator; the generated carbon monoxide enters the alkali scrubbing and desulfurization device after being dedusted and cooled by the dust removal and cooling device, and enters the gas holder for storage after alkali scrubbing and desulfurization; the carbon monoxide in the gas holder is pressurized and dried by the carbon monoxide post-treatment device and then stored, waiting to be sent to the mixing tee; carbon monoxide and chlorine are respectively sent into the mixing tee from two inlets of the mixing tee, enter the phosgene synthesizer to react, and release reaction heat, and the reaction heat is removed by cooling water; the reacted mixed gas enters the purification reactor to ensure that the unreacted chlorine is completely reacted; the phosgene coming out of the purification reactor can be used as a phosgenation raw material in the downstream section.

[0010] In the carbon monoxide generation unit, chlorine generation unit, and synthesis unit, the layout of each equipment is reasonable and the continuity is strong, which can effectively reduce the degree of manual participation, reduce the labor intensity and operation risk, and at the same time improve the production efficiency. For example, in the alkali scrubbing and desulfurization device in the carbon monoxide generation unit, a liquid caustic soda supply system is used to replace solid caustic soda, which can realize the control of the supply of caustic soda solution by the alkali preparation system. Another example is that an automatic coke feeding device is used to supply coke to the carbon monoxide generator instead of manual coke feeding.

[0011] Further, the dust removal and cooling device includes a cyclone dust collector, a water washing tower, a water ring pump, a gas-water separator, and a foam water washing tower connected in sequence through pipelines; the inlet end of the cyclone dust collector is connected to the carbon monoxide outlet end of the carbon monoxide generator, the outlet end of the cyclone dust collector is connected to the inlet end of the water washing tower, the outlet end of the water washing tower is connected to the inlet end of the gas-water separator through a pipeline after passing through the water ring pump, the outlet end of the gas-water separator is connected to the inlet end of the foam water washing tower, and the outlet end of the foam water washing tower is connected to the inlet end of the alkali scrubbing and desulfurization device through a pipeline.

[0012] The carbon monoxide gas generated by the carbon monoxide generator is cooled and dedusted by the cyclone dust collector and the water washing tower, further pressurized by the water ring pump, separated from steam and water by the gas-water separator, then enters the foam water washing tower for further cooling and dedusting, and is then sent to the alkali scrubbing and desulfurization device for alkali scrubbing and desulfurization.

[0013] Further, the water supply system includes a water tank, a water pump one for sending the water in the water tank into the water washing tower, and a water pump two for sending the water into the foam water washing tower; the washing ash water washed out by the dust removal and cooling device is sent into the wastewater treatment system through a pipeline for treatment and then recycled back into the water tank.

[0014] After the washing ash water enters the wastewater treatment system, it first enters the sedimentation tank, then is pumped into the microporous filter by a centrifugal pump, filtered and then flows back to the sedimentation tank, and then is sent to the water tank for recycling by the circulating water pump.

[0015] Further, the caustic scrubbing desulfurization device includes a first caustic scrubbing tower and a second caustic scrubbing tower arranged in series; the air inlet end of the first caustic scrubbing tower is connected to the air outlet end of the dust removal and cooling device through a pipeline via a fan, and the air outlet end of the second caustic scrubbing tower is connected to the positive water seal of the gas holder.

[0016] The carbon monoxide sent out by the dust removal and cooling device first enters the first caustic scrubbing tower, then enters the second caustic scrubbing tower for caustic scrubbing desulfurization, and then is sent to the gas holder for storage.

[0017] Further, the alkali preparation system includes an alkali solution tank, an on-line pH meter for monitoring the pH value of the alkali solution in the alkali solution tank, a first alkali pump for pumping the alkali solution in the alkali solution tank to the first caustic scrubbing tower, and a second alkali pump for pumping it to the second caustic scrubbing tower; the bottom liquid washed off by the caustic scrubbing desulfurization device is circulated back to the alkali solution tank through a pipeline.

[0018] The alkali solution in the alkali solution tank is sent into the first caustic scrubbing tower and the second caustic scrubbing tower by the alkali pump, flows from top to bottom in the tower, flows countercurrently to the incoming gas, and finally falls to the bottom of the tower and then flows out of the tower bottom and returns to the alkali solution tank.

[0019] Further, the carbon monoxide post-treatment device includes a pre-pressurization buffer tank, a compressor, a condensate gas-water separator, a condenser, a post-pressurization buffer tank, a drying tower and a carbon monoxide buffer tank connected in sequence through pipelines; the inlet end of the pre-pressurization buffer tank is connected to the inverse water seal of the gas holder, and the outlet end of the carbon monoxide buffer tank is connected to the carbon monoxide inlet end of the mixing tee.

[0020] The carbon monoxide coming from the inverse water seal of the gas holder enters the compressor through the pre-pressurization buffer tank for pressurization, then enters the condensate gas-water separator to separate gas and liquid, the gas is condensed by the condenser, enters the post-pressurization buffer tank, then enters the drying tower for dehydration and drying, and then is sent to the carbon monoxide buffer tank for storage and standby.

[0021] Further, the oxygen supply system includes a liquid oxygen tank, a liquid oxygen evaporator and an oxygen buffer tank connected in sequence through pipelines; the outlet end of the oxygen buffer tank is connected to the oxygen nozzle of the carbon monoxide generator.

[0022] The liquid oxygen in the liquid oxygen tank is vaporized into oxygen by the liquid oxygen evaporator, enters the oxygen buffer tank, and then is sent into the carbon monoxide generator.

[0023] Further, the chlorine generation unit includes a liquid chlorine tank, a liquid chlorine evaporator and a chlorine buffer tank connected in sequence through pipelines; the outlet end of the chlorine buffer tank is connected to the chlorine inlet end of the mixing tee.

[0024] The liquid chlorine in the liquid chlorine tank is vaporized into chlorine by the liquid chlorine evaporator, enters the chlorine buffer tank, and then is sent into the mixing tee.

[0025] Further, it also includes a tail gas destruction unit for receiving and processing the tail gases generated by the carbon monoxide generation unit, the chlorine gas generation unit, and the synthesis unit.

[0026] Compared with the prior art, the phosgene synthesis device of the present utility model has the following advantages:

[0027] The structural design of each section of the phosgene synthesis device of the present utility model is reasonable, and the layout between each device is reasonable. Planned according to the phosgene synthesis path, it has strong continuity, can effectively reduce the manual participation degree in the production process, effectively reduce the labor intensity and operation risk, and improve the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0029] Figure 1 is a simplified structural schematic diagram of the phosgene synthesis device according to the embodiment of the present utility model.

[0030] Description of the reference numerals:

[0031] 1 - Carbon monoxide generator, 2 - Gas holder, 3 - Automatic coke adding device, 4 - Cyclone dust collector, 5 - Water washing tower, 6 - Water ring pump, 7 - Gas-water separator, 8 - Foam water washing tower, 9 - First caustic washing tower, 10 - Second caustic washing tower, 11 - Buffer tank before pressurization, 12 - Compressor, 13 - Condensing gas-water separator, 14 - Condenser, 15 - Buffer tank after pressurization, 16 - Drying tower, 17 - Carbon monoxide buffer tank, 18 - Liquid oxygen tank, 19 - Liquid oxygen evaporator, 20 - Oxygen buffer tank, 21 - Water tank, 22 - First water pump, 23 - Second water pump, 24 - Caustic solution tank, 25 - First caustic pump, 26 - Second caustic pump, 27 - Liquid chlorine tank, 28 - Liquid chlorine evaporator, 29 - Chlorine gas buffer tank, 30 - Mixing tee, 31 - Phosgene synthesizer, 32 - Purification reactor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0033] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0034] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific circumstances.

[0035] The present utility model will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0036] As Figure 1 shown, a phosgene synthesis device includes a carbon monoxide generation unit, a chlorine generation unit, a synthesis unit, and a tail gas destruction unit;

[0037] The carbon monoxide generation unit includes a carbon monoxide generator 1, a dust removal and cooling device, an alkali washing and desulfurization device, a gas holder 2, a carbon monoxide post-treatment device, an oxygen supply system for providing oxygen to the carbon monoxide generator 1, an automatic coke adding device 3 for providing coke to the carbon monoxide generator 1, a water supply system for providing spray water to the dust removal and cooling device, and a alkali preparation system for providing alkali solution to the alkali washing and desulfurization device, which are connected in sequence through pipelines;

[0038] Among them, the dust removal and cooling device includes a cyclone dust collector 4, a water washing tower 5, a water ring pump 6, a gas-water separator 7, and a foam water washing tower 8, which are connected in sequence through pipelines; the inlet end of the cyclone dust collector 4 is connected to the carbon monoxide outlet end of the carbon monoxide generator 1, the outlet end of the cyclone dust collector 4 is connected to the inlet end of the water washing tower 5, the outlet end of the water washing tower 5 is connected to the inlet end of the gas-water separator 7 through a pipeline after passing through the water ring pump 6, the outlet end of the gas-water separator 7 is connected to the inlet end of the foam water washing tower 8, and the outlet end of the foam water washing tower 8 is connected to the inlet end of the alkali washing and desulfurization device through a pipeline;

[0039] The caustic scrubbing desulfurization device includes a first caustic scrubbing tower 9 and a second caustic scrubbing tower 10 arranged in series; the air inlet end of the first caustic scrubbing tower 9 is connected to the air outlet end of the dust removal and cooling device through a pipeline via a fan, and the air outlet end of the second caustic scrubbing tower 10 is connected to the positive water seal of the gas holder 2;

[0040] The carbon monoxide post-treatment device includes a pre-pressurization buffer tank 11, a compressor 12, a condensate gas-water separator 13, a condenser 14, a post-pressurization buffer tank 15, a drying tower 16, and a carbon monoxide buffer tank 17 connected in sequence through pipelines; the inlet end of the pre-pressurization buffer tank 11 is connected to the reverse water seal of the gas holder 2, the outlet end of the pre-pressurization buffer tank 11 is connected to the inlet end of the compressor 12, the outlet end of the compressor 12 is connected to the inlet end of the condensate gas-water separator 13, the air outlet end of the condensate gas-water separator 13 is connected to the inlet end of the condenser 14, the air outlet end of the condenser 14 is connected to the inlet end of the post-pressurization buffer tank 15, the outlet end of the post-pressurization buffer tank 15 is connected to the inlet end of the drying tower 16, and the air outlet end of the drying tower 16 is connected to the inlet end of the carbon monoxide buffer tank 17;

[0041] The oxygen supply system includes a liquid oxygen tank 18, a liquid oxygen evaporator 19, and an oxygen buffer tank 20 connected in sequence through pipelines; the air outlet end of the oxygen buffer tank 20 is connected to the oxygen nozzle of the carbon monoxide generator 1;

[0042] The water supply system includes a water tank 21, a first water pump 22 for sending the water in the water tank 21 into the water washing tower 5, and a second water pump 23 for sending the water into the foam water washing tower 8; the washing ash water washed out by the dust removal and cooling device is sent into the wastewater treatment system through a pipeline for treatment and then recycled back into the water tank 21;

[0043] The alkali preparation system includes an alkali solution tank 24, an on-line pH meter for monitoring the pH value of the alkali solution in the alkali solution tank 24, a first alkali pump 25 for pumping the alkali solution in the alkali solution tank 24 to the first caustic scrubbing tower 9, and a second alkali pump 26 for pumping the alkali solution to the second caustic scrubbing tower 10; the bottom liquid washed off by the caustic scrubbing desulfurization device is recycled back into the alkali solution tank 24 through a pipeline;

[0044] The chlorine generation unit includes a liquid chlorine tank 27, a liquid chlorine evaporator 28, and a chlorine buffer tank 29 connected in sequence through pipelines;

[0045] The synthesis unit includes a mixing tee 30, a phosgene synthesizer 31 connected to the air outlet end of the mixing tee 30, and a purification reactor 32 connected to the reaction mixture outlet end of the phosgene synthesizer 31; the chlorine gas inlet end of the mixing tee 30 is connected to the outlet end of the chlorine buffer tank 29, and the carbon monoxide inlet end of the mixing tee 30 is connected to the outlet end of the carbon monoxide buffer tank 17;

[0046] The tail gas destruction unit is used to receive and process the tail gases generated by the carbon monoxide generation unit, the chlorine generation unit, and the synthesis unit.

[0047] The working process of the phosgene synthesis device described in the present utility model is as follows:

[0048] The liquid oxygen in the liquid oxygen tank 18 is vaporized into oxygen by the liquid oxygen evaporator 19, enters the oxygen buffer tank 20, and then enters the furnace body through the oxygen nozzle of the carbon monoxide generator 1, and reacts with the coke fed into the furnace body through the coke feed port of the carbon monoxide generator 1 provided by the automatic coking device 3 to generate carbon monoxide; the generated carbon monoxide is cooled and dedusted by the cyclone dust collector 4 and the water scrubber 5, and after being pressurized by the water ring pump 6 and separated from steam and water by the gas-water separator 7, it enters the foam water scrubber 8 for further cooling and dedusting, then enters the first caustic scrubber 9 first, and then enters the second caustic scrubber 10. After caustic scrubbing and desulfurization, it is sent to the gas holder 2 for storage; the carbon monoxide from the inverse water seal of the gas holder 2 enters the compressor 12 through the buffer tank 11 before pressurization for boosting, and after separating gas and liquid in the condensate gas-water separator 13, the gas is condensed by the condenser 14 and then enters the buffer tank 15 after pressurization, and then enters the drying tower 16 for dehydration and drying, and then is sent to the carbon monoxide buffer tank 17 for storage and standby;

[0049] The liquid chlorine in the liquid chlorine tank 27 is vaporized into chlorine by the liquid chlorine evaporator 28 and enters the chlorine buffer tank 29 for storage and standby;

[0050] The carbon monoxide in the carbon monoxide buffer tank 17 and the chlorine in the chlorine buffer tank 29 are respectively fed into the mixing tee 30 through the two inlets of the mixing tee 30, enter the phosgene synthesizer 31 for reaction, and the reacted mixed gas enters the purification reactor 31. The phosgene coming out of the purification reactor 31 can be used as a phosgenation raw material in the downstream section.

[0051] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A phosgene synthesis device, characterized in that: include: A carbon monoxide generating unit, comprising a carbon monoxide generating furnace, a dust removal and cooling device, an alkali washing and desulfurization device, a gas holder, a carbon monoxide post-processing device, and an oxygen supply system for providing oxygen to the carbon monoxide generating furnace, an automatic coking device for providing coke to the carbon monoxide generating furnace, a water supply system for providing spray water to the dust removal and cooling device, and an alkali preparation system for providing alkali solution to the alkali washing and desulfurization device, which are sequentially connected through pipelines; Chlorine gas generating unit; The synthesis unit comprises a mixing tee, a phosgene synthesizer connected to the gas outlet end of the mixing tee, and a purification reactor connected to the outlet end of the reaction mixed gas of the phosgene synthesizer; the two gas inlet ends of the mixing tee are respectively connected to the carbon monoxide outlet end of the carbon monoxide post-treatment device and the chlorine outlet end of the chlorine generating unit.

2. The phosgene synthesis device according to claim 1, characterized in that: The dust removal and cooling device comprises a cyclone dust collector, a water scrubber, a water ring pump, a gas-water separator and a foam water scrubber which are sequentially connected via pipelines; the inlet end of the cyclone dust collector is connected to the carbon monoxide outlet end of the carbon monoxide generator, the outlet end of the cyclone dust collector is connected to the inlet end of the water scrubber, the outlet end of the water scrubber is connected to the inlet end of the gas-water separator via a pipeline after passing through the water ring pump, the outlet end of the gas-water separator is connected to the inlet end of the foam water scrubber, and the outlet end of the foam water scrubber is connected to the inlet end of the alkali washing desulfurization device via a pipeline.

3. The phosgene synthesis device according to claim 2, characterized in that: The water supply system includes a water tank, a water pump 1 that sends the water in the water tank to the water washing tower, and a water pump 2 that sends the water to the foam water washing tower; the ash washing water eluted by the dust removal and cooling device is sent to the wastewater treatment system through a pipeline for treatment, and then circulated back to the water tank.

4. The phosgene synthesis device according to claim 1, characterized in that: The alkali washing and desulfurization device comprises an alkali washing tower 1 and an alkali washing tower 2 which are arranged in series; the air inlet end of the alkali washing tower 1 is connected to the air outlet end of the dust removal and cooling device through a pipeline via a fan, and the air outlet end of the alkali washing tower 2 is connected to the positive water seal of the gas cabinet.

5. The phosgene synthesis device according to claim 4, characterized in that: The alkali preparation system includes an alkali solution tank, an online pH meter for monitoring the pH value of the alkali solution in the alkali solution tank, an alkali pump 1 for pumping the alkali solution in the alkali solution tank to the alkali washing tower 1, and an alkali pump 2 for pumping the alkali solution to the alkali washing tower 2; the bottom liquid eluted by the alkali washing desulfurization device is circulated back to the alkali solution tank through a pipeline.

6. The phosgene synthesis device according to claim 1, characterized in that: The carbon monoxide post-treatment device includes a pre-pressurization buffer tank, a compressor, a condensate gas-water separator, a condenser, a post-pressurization buffer tank, a drying tower and a carbon monoxide buffer tank which are sequentially connected through pipelines; the inlet end of the pre-pressurization buffer tank is connected to the reverse water seal of the gas cabinet, and the outlet end of the carbon monoxide buffer tank is connected to the carbon monoxide inlet end of the mixing tee.

7. The phosgene synthesis device according to claim 1, characterized in that: The oxygen supply system comprises a liquid oxygen tank, a liquid oxygen evaporator and an oxygen buffer tank which are sequentially connected through pipelines; the gas outlet end of the oxygen buffer tank is connected to the oxygen nozzle of the carbon monoxide generator.

8. The phosgene synthesis device according to claim 1, characterized in that: The chlorine generating unit comprises a liquid chlorine tank, a liquid chlorine evaporator and a chlorine buffer tank which are sequentially connected through pipelines; the gas outlet of the chlorine buffer tank is connected to the chlorine gas inlet of the mixing tee.

9. The phosgene synthesis device according to any one of claims 1 to 8, characterized in that: It also includes a tail gas destruction unit for receiving and treating tail gas generated by the carbon monoxide generating unit, the chlorine generating unit and the synthesis unit.

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