CN211216594U - Chloroethylene production device - Google Patents
Chloroethylene production device Download PDFInfo
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- CN211216594U CN211216594U CN201921663290.2U CN201921663290U CN211216594U CN 211216594 U CN211216594 U CN 211216594U CN 201921663290 U CN201921663290 U CN 201921663290U CN 211216594 U CN211216594 U CN 211216594U
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Abstract
The utility model provides a chloroethylene production device, which belongs to the technical field of chemical product preparation and comprises a mixed feed gas preprocessor, a liquid catalyst providing mechanism, a reactor and a condenser; the mixed raw material gas preprocessor is provided with an inlet and an outlet; the liquid catalyst supply mechanism is used for supplying liquid catalyst; the reactor is communicated with the mixed feed gas preprocessor and the liquid catalyst providing mechanism, the built-in reaction area is used for the mixed hydrogen chloride gas, acetylene gas and liquid catalyst to react, and the reactor is provided with a heat exchange mechanism used for adjusting the temperature of the liquid catalyst; the condenser is used for cooling the gasified liquid catalyst carried in the reaction product chloroethylene gas and reflowing to the reaction area, and the condenser is provided with a chloroethylene gas discharge port. Aims to solve the technical problems that in the existing production process, a mercury catalyst pollutes the environment, has a serious temperature runaway phenomenon, has more byproducts, and is easy to inactivate so that the acetylene conversion rate is low.
Description
Technical Field
The utility model belongs to the technical field of the chemical industry product preparation, more specifically say, relate to a chloroethylene apparatus for producing.
Background
Vinyl Chloride (VC) is a monomer for preparing polyvinyl chloride, and 99 percent of VC in the world is used for producing polyvinyl chloride (PVC for short) at present.
Polyvinyl chloride is the first and second most common synthetic resin materials in China, and is collectively called five common resins together with Polyethylene (PE), polypropylene (PP), Polystyrene (PS) and ABS. The polyvinyl chloride resin has the characteristics of excellent chemical corrosion resistance, electric insulation, flame retardance and the like, and is widely applied to national defense, industrial products, building materials, daily necessities of people, floor leather, artificial leather, floor tiles, pipes, electric wires, packaging films, plastic bottles, sealing materials, foaming materials, fibers and the like.
By 2018, the domestic polyvinyl chloride production capacity is about 2500 million tons/year. The global consumption of PVC in 2016 is over 4200 ten thousand tons, corresponding to more than 16% of the total demand for plastics, and is expected to increase at a rate of 2.3% per year, up to 2024 years.
At present, the industrial synthesis method of vinyl chloride monomer mainly comprises an acetylene hydrochlorination method and an ethylene oxychlorination method, the production capacity of Chinese PVC in 2017 reaches about 2300 million tons, about 80% of PVC production comes from an acetylene route and accounts for about 40% of the global PVC capacity.
The method for producing vinyl chloride by acetylene hydrochlorination is a gas-solid phase reaction with mercuric chloride as a catalyst, and a fixed bed reactor is adopted, so that serious mercury loss exists, and the environment is seriously polluted; the hydrochlorination reaction of acetylene is a strong exothermic reaction, a fixed bed reactor has a serious 'temperature runaway' phenomenon, a plurality of byproducts exist, the burden is caused on the subsequent product refining, carbon is easily deposited on the surface of a reactant, the catalyst is inactivated, and the conversion rate of acetylene is reduced. Therefore, the improvement of the existing production device of the vinyl chloride is a problem to be solved urgently by production enterprises.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a chloroethylene apparatus for producing aims at solving among the gas-solid phase reaction mercury catalyst polluted environment among the current production technology, has serious "temperature runaway" phenomenon, and the accessory substance is many, and the easy deactivation of catalyst makes the technical problem that acetylene conversion rate reduces.
In order to achieve the above object, the utility model adopts the following technical scheme: provided is a vinyl chloride production apparatus including:
the mixed raw material gas preprocessor is provided with an inlet and an outlet and is used for mixing the hydrogen chloride gas and the acetylene gas, removing impurities and dehumidifying;
a liquid catalyst supply mechanism for cyclically supplying a liquid catalyst participating in the reaction;
the reactor is communicated with the mixed feed gas preprocessor and the liquid catalyst providing mechanism, the built-in reaction area is used for mixing hydrogen chloride gas, acetylene gas and liquid catalyst to react, and is provided with a heat exchange mechanism used for adjusting the temperature of the liquid catalyst and further adjusting the temperature of a reaction system; and
the condenser is used for cooling the gasified liquid catalyst carried in the reaction product chloroethylene gas and refluxing to the reaction area, and the condenser is provided with a chloroethylene gas discharge port.
As another embodiment of this application, still be equipped with the feeding district in the reactor, the feeding district is located the reaction zone downside, the feeding district intercommunication the export of mixing feed gas preprocessor and the liquid outlet of liquid catalyst provision mechanism.
As another embodiment of the application, the hydrogen chloride gas, the acetylene gas and the liquid catalyst enter the reaction area after being uniformly mixed by a material distributor arranged on the lower side of the reaction area.
As another embodiment of this application, heat exchange mechanism arranges in the reaction zone upside, heat exchange mechanism shell and tube heat exchanger in shell and tube heat exchanger, plate heat exchanger, shell and tube heat exchanger.
As another embodiment of this application, still be equipped with the gas-liquid separation district in the reactor, the gas-liquid separation district is located the heat transfer mechanism upside, gas-liquid separation district department is equipped with the demister, the liquid level of liquid catalyst is located the downside of gas-liquid separation district.
As another embodiment of the present application, the condenser is used to convert the vaporized liquid catalyst entrained in the vinyl chloride gas after passing through the demister into a liquid state and reflux into the reactor.
As another embodiment of the present application, the liquid catalyst supply mechanism includes:
the post-processor is internally provided with a partition plate, the partition plate divides the post-processor into a first cavity and a second cavity, the upper parts of the first cavity and the second cavity are communicated, and the post-processor is provided with a liquid filling port;
the first pipeline is communicated with the bottom of the first cavity and supplies liquid to the reactor through a pump;
one end of the second pipeline is communicated with the bottom of the second cavity, and the other end of the second pipeline is communicated with the gas-liquid separation zone of the reactor and is used for refluxing the cooled liquid catalyst;
and the third pipeline is positioned at the top of the post processor, is communicated with the condenser and is used for sending the chloroethylene gas entering the post processor into the condenser.
As another embodiment of the present application, the first pipeline, the second pipeline and the third pipeline are all provided with valves.
As another embodiment of the present application, the top of the reactor is further provided with a pressure relief valve.
As another example herein, the liquid catalyst is a non-mercury catalyst.
The utility model provides a chloroethylene production device's beneficial effect lies in:
1. by adopting a reactor capable of exchanging heat, a large amount of reaction heat generated in the reaction of acetylene and hydrogen chloride is transferred in time, so that temperature runaway is avoided, the occurrence of side reactions is reduced, the phenomenon of carbon deposition on the surface of reactants is reduced, the activity of a catalyst is improved, and the conversion rate of acetylene is improved;
2. a partition plate is arranged in the post-processor, when a small amount of chloroethylene enters the post-processor from the second pipeline, the liquid catalyst can better complete gas-liquid separation in the process of moving upwards from the bottom, so that the small amount of chloroethylene can upwards return to the condenser through the third pipeline, and on the other hand, the small amount of unreacted acetylene can continuously complete the reaction, so that the conversion rate of the reaction can reach more than 97%;
3. the device can be miniaturized, the occupied area is reduced, and the productivity is improved;
4. the device adopts the liquid catalyst, has short reaction path and can improve the reaction efficiency;
5. the device for producing the chloroethylene has no three wastes, and can realize clean production.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a vinyl chloride production apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the structure of the reactor of FIG. 1;
FIG. 3 is a schematic diagram of the post-processor of FIG. 1;
fig. 4 is a schematic structural diagram of the mixed feed gas preprocessor in fig. 1;
fig. 5 is a schematic view of the condenser of fig. 1.
In the figure: 1. the mixed raw material gas pre-processor comprises a mixed raw material gas pre-processor, 2, a material distributor, 3, a reaction zone, 4, a heat exchange mechanism, 5, a reactor, 6, a gas-liquid separation zone, 7, a demister, 8, a condenser, 9, a third pipeline, 10, a post-processor, 11, a first pipeline, 12, a second pipeline, 13 and a feeding zone.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 1 to 5, a vinyl chloride production apparatus according to the present invention will now be described. A chloroethylene production device comprises a mixed raw material gas preprocessor 1, a liquid catalyst providing mechanism, a reactor 5 and a condenser 8;
the mixed raw material gas preprocessor 1 is provided with an inlet and an outlet and is used for mixing hydrogen chloride gas and acetylene gas, removing impurities and dehumidifying;
the liquid catalyst supply mechanism is used for circularly supplying liquid catalyst participating in the reaction;
the reactor 5 is communicated with the mixed feed gas preprocessor 1 and the liquid catalyst providing mechanism, the built-in reaction area 3 is used for mixing hydrogen chloride gas, acetylene gas and liquid catalyst to react, and is provided with a heat exchange mechanism 4 used for adjusting the temperature of the liquid catalyst, and further adjusting the temperature of a reaction system; and
the condenser 8 is used for cooling the gasified liquid catalyst carried in the reaction product chloroethylene gas and refluxing to the reaction area 3, and the condenser 8 is provided with a chloroethylene gas discharge port.
In this embodiment, hydrogen chloride gas and acetylene gas obtain mixing in mixed feed gas preprocessor 1, both get into from the import, can set up two imports, get into two kinds of gases respectively, flow out from the exit after drying and edulcoration after mixing, can obtain comparatively pure mist, the drying can be realized through drier etc., and the edulcoration is then to the type of impurity, set up corresponding edulcoration device, can filter it effectively, for example, acetylene is by the active carbon absorption dehydration wherein, later with hydrogen chloride mixture, mist passes through built-in acid mist filter and removes the hydrochloric acid impurity processing back, reach the operation requirement.
The liquid catalyst providing mechanism is used for providing a liquid catalyst for catalysis, the liquid catalyst can be reacted when being mixed with two gases at the same time, the liquid catalyst is supplied in a circulating mode, the temperature balance in a reaction system is ensured, meanwhile, the material entering the pump is liquid, the cavitation erosion of the pump is avoided, and the safety of a production system is improved.
Aiming at the problem of reaction heat release, in order to avoid the phenomenon of temperature runaway, the heat exchange mechanism 4 is arranged, so that the temperature of the liquid catalyst after reaction can be reduced, and the reaction efficiency is improved.
The condenser 8 is used for converting gasified liquid catalyst carried by vinyl chloride gas generated at any time into liquid after cooling, and reflowing the liquid catalyst to the reaction area 3 again to maintain the balance of the catalyst in the reaction system, and the upper end of the condenser 8 is provided with an exhaust port for discharging rough vinyl chloride gas, thereby facilitating entering a subsequent refining link.
As a specific implementation manner of the embodiment of the present invention, as shown in fig. 2, a feeding area 13 is further disposed in the reactor 5, the feeding area 13 is located at the lower side of the reaction area 3, the feeding area 13 is communicated with the outlet of the mixed raw material gas preprocessor 1 and the liquid outlet of the liquid catalyst providing mechanism.
In this embodiment, the reactor 5 is divided into zones, and the mixed gas and the liquid catalyst gradually rise from below and enter the feeding zone 13 before entering the reaction zone 3.
As a specific implementation manner of the embodiment of the present invention, as shown in fig. 2, the hydrogen chloride gas, the acetylene gas, and the liquid catalyst enter the reaction area 3 after being uniformly mixed by the material distributor 2 disposed at the lower side of the reaction area 3.
In this embodiment, a material distributor 2 is further provided, before entering the reaction zone 3, the mixed gas and the liquid catalyst can be uniformly dispersed in the reaction zone 3 after passing through the material distributor 2, so that the reaction is more thorough, and the material distributor 2 is the prior art.
As a specific implementation manner of the embodiment of the present invention, as shown in fig. 2, the heat exchange mechanism 4 is disposed in the upper side of the reaction area 3, the heat exchange mechanism 4 is one of a tube-in-tube heat exchanger, a plate heat exchanger, and a shell-and-tube heat exchanger, and can also adopt heat exchangers of other forms.
In this embodiment, the heat exchange mechanism 4 is used to reduce the temperature of the liquid catalyst, and after the liquid catalyst enters the reactor 2, the reaction zone 3 is filled with the liquid catalyst, and the heat exchange mechanism 4 is immersed, so that the temperature can be effectively reduced and the contact time with the mixed gas is prolonged.
As a specific implementation manner of the embodiment of the present invention, as shown in fig. 1 and fig. 2, a gas-liquid separation zone 6 is further disposed in the reactor 5, the gas-liquid separation zone 6 is located on the upper side of the heat exchange mechanism 4, a demister 7 is disposed at the gas-liquid separation zone 6, and the liquid level of the liquid catalyst is located on the lower side of the gas-liquid separation zone 6.
In this embodiment, the gas-liquid separation region 6 is actually a region where the gas escapes from the liquid catalyst and then goes out from above the liquid level, the vinyl chloride gas generated by the reaction in this region can be separated from the liquid catalyst, the separated vinyl chloride gas enters the condenser 8 through the demister 7, and the demister 7 is a prior art for removing liquid.
As a specific implementation manner of the embodiment of the present invention, the condenser 8 is used to convert the gasified liquid catalyst entrained in the vinyl chloride gas after passing through the demister 7 into a liquid state and to reflux the liquid catalyst to the reactor 5.
As a specific implementation manner of the embodiment of the present invention, the liquid catalyst providing mechanism includes:
the post-processor 10 is internally provided with a partition board, the partition board divides the post-processor 10 into a first cavity and a second cavity, the upper parts of the first cavity and the second cavity are communicated, and a liquid adding opening is formed in the post-processor 10;
the first pipeline 11 is communicated with the bottom of the first cavity and supplies liquid to the reactor 5 through a pump;
one end of the second pipeline 12 is communicated with the bottom of the second cavity, and the other end of the second pipeline is communicated with the gas-liquid separation zone 6 of the reactor 5 and is used for refluxing the cooled liquid catalyst; and a third pipe 9, located at the top of the post-processor 10, communicating with the condenser 8, for feeding the vinyl chloride gas introduced into the post-processor 10 into the condenser 8.
The embodiment provides a specific implementation manner of a liquid catalyst, as shown in fig. 1 and fig. 3, that is, it has a post-processor 10 for accommodating the liquid catalyst, which is divided into two communicating cavities, that is, a first cavity and a second cavity, which are separated by a partition plate, liquid is added into the interior through a liquid adding port, the liquid catalyst in the first cavity enters into the reactor 5 by means of a pump, fills the reaction zone 3 and the region where the heat exchanging mechanism 4 is located, and is mixed with the mixed gas to react, the liquid catalyst is a continuous flowing process, which flows out from the opening of the gas-liquid separation zone 6, and returns to the post-processor 10 through a second pipe 12, the liquid catalyst which is continuously and circularly flowing is arranged, firstly, in order to maintain the temperature balance in the reaction system, and at the same time, in order to solve the problem of recovering a small amount of vinyl chloride gas which enters into the post-processor 10 along, two cavities are arranged, vinyl chloride gas entering from the bottom continuously rises in the second cavity, finally flows through the third pipeline 9 and enters the condenser 8 to be recycled, meanwhile, a small amount of unreacted mixed gas entering along with the vinyl chloride gas can also react again in the process, and the generated vinyl chloride gas also enters the condenser 8.
As a specific implementation manner of the embodiment of the present invention, the first pipeline 11, the second pipeline 12 and the third pipeline 9 are all provided with valves.
As a specific implementation manner of the embodiment of the present invention, the top of the reactor 5 is further provided with a pressure relief valve.
As a specific implementation of the embodiments of the present invention, the liquid catalyst is a non-mercury catalyst. The non-mercury catalyst can avoid environmental pollution and can be one of imidazole hydrochloride, N-methyl pyrrolidone hydrochloride, choline chloride or quaternary phosphonium salt; the active component of the liquid catalyst is one of cupric chloride, cuprous chloride, stannic chloride and ruthenium trichloride.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Vinyl chloride apparatus for producing, characterized by comprising:
the mixed raw material gas preprocessor is provided with an inlet and an outlet and is used for mixing the hydrogen chloride gas and the acetylene gas, removing impurities and dehumidifying;
a liquid catalyst supply mechanism for cyclically supplying a liquid catalyst participating in the reaction;
the reactor is communicated with the mixed feed gas preprocessor and the liquid catalyst providing mechanism, the built-in reaction area is used for the mixed hydrogen chloride gas, acetylene gas and liquid catalyst to react, and the reactor is provided with a heat exchange mechanism used for adjusting the temperature of the liquid catalyst; and
the condenser is used for cooling the gasified liquid catalyst carried in the reaction product chloroethylene gas and refluxing to the reaction area, and the condenser is provided with a chloroethylene gas discharge port.
2. A vinyl chloride production apparatus according to claim 1, wherein a feed zone is further provided in said reactor, said feed zone being located at a lower side of said reaction zone, said feed zone communicating with an outlet of said mixed feed gas preconditioner and a liquid outlet of said liquid catalyst supply mechanism.
3. The vinyl chloride production apparatus of claim 1, wherein the hydrogen chloride gas, the acetylene gas, and the liquid catalyst are mixed by a material distributor disposed at a lower side of the reaction zone and then enter the reaction zone.
4. The vinyl chloride production apparatus according to claim 1, wherein said heat exchange means is disposed on the upper side of said reaction zone, and said heat exchange means is one of a shell-and-tube heat exchanger, a plate heat exchanger, and a shell-and-tube heat exchanger.
5. A vinyl chloride production apparatus as set forth in claim 4, wherein said reactor is further provided therein with a gas-liquid separation zone located on an upper side of said heat exchange means, said gas-liquid separation zone is provided with a demister, and a liquid level of said liquid catalyst is located on a lower side of said gas-liquid separation zone.
6. A vinyl chloride production apparatus as set forth in claim 5, wherein said condenser converts the vaporized liquid catalyst entrained in the vinyl chloride gas after passing through the demister into a liquid state and returns it to the reactor.
7. The vinyl chloride production apparatus according to claim 5, wherein the liquid catalyst supply means includes:
the post-processor is internally provided with a partition plate, the partition plate divides the post-processor into a first cavity and a second cavity, the upper parts of the first cavity and the second cavity are communicated, and the post-processor is provided with a liquid filling port;
the first pipeline is communicated with the bottom of the first cavity and supplies liquid to the reactor through a pump;
one end of the second pipeline is communicated with the bottom of the second cavity, and the other end of the second pipeline is communicated with the gas-liquid separation zone of the reactor and is used for refluxing the cooled liquid catalyst;
and the third pipeline is positioned at the top of the post processor, is communicated with the condenser and is used for sending the chloroethylene gas entering the post processor into the condenser.
8. The vinyl chloride production apparatus of claim 7, wherein valves are provided on the first pipe, the second pipe, and the third pipe.
9. Vinyl chloride production plant according to claim 1, wherein a pressure relief valve is provided at the top of said reactor.
10. Vinyl chloride production unit according to claim 1, wherein said liquid catalyst is a non-mercury catalyst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921663290.2U CN211216594U (en) | 2019-09-30 | 2019-09-30 | Chloroethylene production device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921663290.2U CN211216594U (en) | 2019-09-30 | 2019-09-30 | Chloroethylene production device |
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| CN211216594U true CN211216594U (en) | 2020-08-11 |
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| CN201921663290.2U Active CN211216594U (en) | 2019-09-30 | 2019-09-30 | Chloroethylene production device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112142551A (en) * | 2020-09-08 | 2020-12-29 | 德州中科易工工程技术有限公司 | Device and method for synthesizing vinyl chloride by catalyzing hydrochlorination of acetylene through copper-based catalyst |
| CN113121303A (en) * | 2021-04-26 | 2021-07-16 | 河北美邦工程科技股份有限公司 | Chloroethylene production process and special device thereof |
| CN115253516A (en) * | 2022-08-10 | 2022-11-01 | 宁夏新龙蓝天科技股份有限公司 | Acid-resistant high-temperature-resistant mercury-free catalyst catalysis vinyl chloride conversion equipment |
-
2019
- 2019-09-30 CN CN201921663290.2U patent/CN211216594U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112142551A (en) * | 2020-09-08 | 2020-12-29 | 德州中科易工工程技术有限公司 | Device and method for synthesizing vinyl chloride by catalyzing hydrochlorination of acetylene through copper-based catalyst |
| CN112142551B (en) * | 2020-09-08 | 2023-06-16 | 德州中科易工工程技术有限公司 | Device and method for synthesizing chloroethylene by catalyzing hydrochlorination of acetylene by copper-based catalyst |
| CN113121303A (en) * | 2021-04-26 | 2021-07-16 | 河北美邦工程科技股份有限公司 | Chloroethylene production process and special device thereof |
| CN115253516A (en) * | 2022-08-10 | 2022-11-01 | 宁夏新龙蓝天科技股份有限公司 | Acid-resistant high-temperature-resistant mercury-free catalyst catalysis vinyl chloride conversion equipment |
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