CN214193094U - Oxychlorination reaction unit and oxychlorination reaction system based on four-stage reactor - Google Patents
Oxychlorination reaction unit and oxychlorination reaction system based on four-stage reactor Download PDFInfo
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- CN214193094U CN214193094U CN202022577175.2U CN202022577175U CN214193094U CN 214193094 U CN214193094 U CN 214193094U CN 202022577175 U CN202022577175 U CN 202022577175U CN 214193094 U CN214193094 U CN 214193094U
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Abstract
The utility model provides an oxychlorination reaction unit based on four-stage reactor, oxychlorination reaction system based on four-stage reactor is including four oxychlorination reactors that establish ties in proper order and oxychlorination reaction unit and result aftertreatment and ethylene cyclic unit based on four-stage reactor, wherein: each oxychlorination reactor is a fixed bed reactor, each oxychlorination reactor is provided with a cooling mechanism, an oxygen pipeline is respectively communicated with each oxychlorination reactor through an oxygen branch pipeline, and a hydrogen chloride pipeline and an ethylene pipeline are communicated with the first-stage oxychlorination reactor at the head end. The system has low energy consumption and high safety factor.
Description
Technical Field
The utility model relates to a chemical industry technical field especially relates to an oxychlorination reaction system based on four-stage reactor.
Background
The production of vinyl chloride is divided into an ethylene method and an acetylene method according to raw materials, and the production process is divided into a calcium carbide or natural gas acetylene method, a combination method, an oxychlorination method and a full-equilibrium oxychlorination method. Wherein the ethylene oxychlorination process is an advanced and reasonable production route which is internationally accepted at present. The chloroethylene is directly synthesized by taking hydrogen chloride, oxygen and ethylene as raw materials. The technical key to the oxychlorination unit is the type of reactor and the source of oxygen. The reactor type includes two types, namely an ebullated bed reactor and a fixed bed reactor.
When the fluidized bed reactor is used for operation, ethylene, oxygen and hydrogen chloride are simultaneously added into the reactor according to a certain proportion, an internal cooling coil for removing heat is arranged in the fluidized bed reactor, a cyclone separator is arranged at the upper part of the reactor, and the catalyst carried in the material is collected, so that not only can the loss of the catalyst be caused in the reactor, but also the catalyst is easily released into waste water to cause environmental pollution.
The catalyst is fixed among the fixed bed reactor, and is little to environmental pollution, but fixed bed reactor list platform productivity capacity is less, adopts the mode of two-stage fixed bed series connection to improve productivity among the prior art, like the utility model patent "oxychlorination of ethylene in two-stage fixed bed reactor" of grant publication number CN1067041C, adopts the mode production dichloroethane of two reactors series connection, oxygen in this reaction system with 50%: 50 percent of the mixture enters a two-stage fixed bed reactor, the safety coefficient is low, and simultaneously the minimum load of a two-stage reactor system is 30 percent, so that the requirement of low-load operation of a factory cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an oxychlorination reaction system based on four-stage reactor that allies oneself with based on four-stage reactor to the oxychlorination reaction system factor of safety who exists among the prior art low, problem such as load of operation height, and provide one kind and ally oneself with based on four-stage reactor.
An oxychlorination reaction unit based on a four-stage reactor, comprising four oxychlorination reactors connected in series in sequence, wherein:
each oxychlorination reactor is a fixed bed reactor, each oxychlorination reactor is provided with a cooling mechanism, an oxygen pipeline is respectively communicated with each oxychlorination reactor through an oxygen branch pipeline, and a hydrogen chloride pipeline and an ethylene pipeline are communicated with the first-stage oxychlorination reactor at the head end.
In the above technical scheme, each oxychlorination reactor is a tubular fixed bed reactor, the oxygen pipeline, the hydrogen chloride pipeline and the ethylene pipeline are all provided with preheating mechanisms, and the cooling mechanism is a high-pressure steam heat energy removing mechanism.
In the technical scheme, the four oxychlorination reactors are a primary oxychlorination reactor R-301, a secondary oxychlorination reactor R-302, a tertiary oxychlorination reactor R-303 and a quaternary oxychlorination reactor R-304 respectively, the hydrogen chloride pipeline and the ethylene pipeline are communicated with the primary oxychlorination reactor R-301, and the oxygen pipeline is communicated with each oxychlorination reactor through an oxygen branch pipeline respectively.
The utility model discloses an on the other hand, an oxychlorination reaction system based on four-stage reactor, a serial communication port, include oxychlorination reaction unit and result aftertreatment and ethylene circulation unit based on four-stage reactor, wherein: the product post-treatment and ethylene circulation unit comprises a gas-liquid separation tank for gas-liquid separation, a discharge hole of a four-stage oxychlorination reactor at the tail end is communicated with a feed inlet of the gas-liquid separation tank, a liquid outlet of the gas-liquid separation tank is communicated with an ethylene recovery tower through a pipeline to remove dissolved ethylene, a filler is arranged in the ethylene recovery tower, a steam inlet pipeline is arranged at the lower part of the ethylene recovery tower, and the bottom of the ethylene recovery tower is communicated with an EDC water washing tank V-120 through a pipeline to collect dichloroethane.
In the technical scheme, the gas-liquid separation tank is provided with two stages, namely an oxychlorination primary separation tank V-300 and an oxychlorination secondary separation tank V-310.
In the technical scheme, the product post-treatment and ethylene circulation unit comprises an oxychlorination primary separation tank V-300, an oxychlorination secondary separation tank V-310 and an ethylene recovery tower T-300, a discharge hole of a four-stage oxychlorination reactor R-304 is communicated with the oxychlorination primary separation tank V-300 through a discharge pipeline to perform first gas-liquid separation, a liquid outlet of the oxychlorination primary separation tank V-300 is respectively connected to an inlet pipeline of the ethylene recovery tower T-300 and the top of the four-stage oxychlorination reactor R-304 through an output pipeline provided with an oxychlorination reactor product pump P-300A/B, a condensed water cooler E-304 is arranged on a pipeline between the oxychlorination reactor product pump P-300A/B and the top of the oxychlorination primary separation tank V-300, a top gas outlet of the ethylene recovery tower T-300 is connected to a pipeline between the four-stage oxychlorination reactor R-304 and the oxychlorination primary separation tank V-300, and a bottom liquid outlet of the ethylene recovery tower T-300 is connected to an EDC water washing tank V-120 through a pipeline provided with a water-cooled heat exchanger E-312;
the gas outlet of the primary oxychlorination separation tank V-300 is communicated with the inlet of the secondary oxychlorination separation tank V-310 through a pipeline provided with a condenser E-310 (a shell-and-tube graphite condenser) to carry out secondary gas-liquid separation, the liquid outlet of the secondary oxychlorination separation tank V-310 is communicated with the primary oxychlorination separation tank V-300, the gas outlet of the secondary oxychlorination separation tank V-310 is connected to the primary oxychlorination reactor R-301 through a pipeline provided with an Oxy circulating compressor C-300 to convey ethylene circulating gas, the outlet of the Oxy circulating compressor C-300 is also connected to a condensation tank V-311 through a pipeline provided with a gas condenser E-311, the top gas outlet of the condensation tank V-311 is connected to an Oxy purifying dryer D-310A/B, the bottom liquid outlet of the condensation tank V-311 is connected to the oxychlorination primary separating tank V-300 through a pipeline, and the Oxy purification dryer D-310A/B is respectively connected to the HDC reactor R-101 or the purified gas chlorination reactor R-102 through a pipeline.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the environmental impact is low: the utility model discloses a fixed bed technology compares the boiling bed catalyst and is basically lossless, and then can not discharge the catalyst to waste water in, and the copper pollution situation is reduced to minimumly. No large amount of waste water is produced and the dioxin content related to the catalyst used in the oxychlorination process is minimized.
2. High selectivity and safe operation: ethylene concentration is the main driver for the choice of EDC formation in the reaction. The utility model discloses ethylene concentration that fixed bed technology can be controlled is greater than 90%, through the series operation to 4 oxychlorination reactors, through 30%: 30%: 10% oxygen reposition of redundant personnel, makes the reaction conversion rate of Hydrogen Chloride (HCL) be greater than 99.8% (and 2 grades of fixed bed conversion rate 99.7%), thereby can reach more than 98.5% to EDC's selectivity. The organic phase recovered by the oxychlorination unit needs to be sent to an EDC refining acid-base washing process, and HCL in the organic phase is neutralized by alkali, so that the content of HCL in the recovered organic phase can be effectively reduced through the process operation, and the dosage of the NAOH in the EDC refining acid-base washing unit is reduced, and simultaneously, because the oxygen is 30 percent, 10 percent and 50 percent relative to a 2-stage reactor: the 50% ratio makes the device safer to operate.
3. The consumption of the catalyst is low, and the loss of the fixed bed catalyst is basically zero, so that the continuous addition of the catalyst is not needed, and the link of continuously treating solid (waste) is avoided. Because the load of a single reactor is low, the average service life of the catalyst of the 4-stage reactor is generally more than 4 years, and the service life of the catalyst is about 2-4 months longer than that of the catalyst of the 2-stage reactor.
4. And the waste gas emission is reduced, and the oxychlorination unit is not designed to be evacuated into the atmosphere before passing through the washing tower. The off-gas from the oxychlorination unit will be sent to the high temperature chlorination reactor R-101 or to the clean gas chlorination reactor R-102. During start-up and shut-down, the oxychlorination unit is not vented to the atmosphere.
5. The reliability is high, because the (oxychlorination reactor) is made of the best material, the maintenance period is required to be more than 2.5 years on average, and the period is prolonged by about 6 months compared with the period of a 2-stage reactor.
6. The maintenance cost is low, and is extremely low. The oxychlorination reactor does not need to be maintained regularly during normal shutdown and maintenance, compared with a 2-stage reactor, the oxygen introduced into the first-stage reactor is reduced, the carbonization condition of organic matters is obviously improved, and the pressure drop of the reactor (coke is attached to the upper ceramic ring) is controlled. Essentially no coke removal work is required during the catalyst life cycle. And the secondary reactor is required to carry out 1 to 2 times of maintenance work within the service life cycle (3 to 4 years) of the catalyst. Therefore, the top of the first oxychlorination reactor, even if the recycle liquor of the oxychlorination recycle compressor contains high concentrations of organic matter and water (H)2O) does not cause excessive carbon deposition, and reduces the workload of maintenance.
7. The load adjusting interval is large and easy to control, the lowest load of the 2-stage reactor system is about 30 percent, the lowest load of the 4-stage reactor can reach 20 percent, the requirement of low-load operation of a factory is met, and the method can be realized through automatic control.
8. The operation is convenient, and when the 4-stage reactor system is stopped, no further operation is needed. The method can be realized in less than 30 minutes when the vehicle is driven from 0 to full load operation.
Drawings
FIG. 1 shows a flow diagram of an oxychlorination reaction process.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
An oxychlorination reaction unit based on four-stage reactor, includes four oxychlorination reactors that establish ties in proper order, wherein:
each oxychlorination reactor is a fixed bed reactor, each oxychlorination reactor is provided with a cooling mechanism, an oxygen pipeline is respectively communicated with each oxychlorination reactor through an oxygen branch pipeline, and a hydrogen chloride pipeline and an ethylene pipeline are communicated with the first-stage oxychlorination reactor at the head end.
Preferably, each oxychlorination reactor is a tubular fixed bed reactor, the oxygen pipeline, the hydrogen chloride pipeline and the ethylene pipeline are respectively provided with a preheating mechanism, and the cooling mechanism is a high-pressure steam heat energy removing mechanism. An ethylene preheater E-300 is arranged on the ethylene pipeline, an HCL preheater E-301 is arranged on the hydrogen chloride pipeline, and an oxygen preheater E-302 is arranged on the oxygen pipeline.
The four oxychlorination reactors are respectively a primary oxychlorination reactor R-301, a secondary oxychlorination reactor R-302, a tertiary oxychlorination reactor R-303 and a quaternary oxychlorination reactor R-304, the hydrogen chloride pipeline and the ethylene pipeline are communicated with the primary oxychlorination reactor R-301, the oxygen pipeline is respectively communicated with each oxychlorination reactor through an oxygen branch pipeline, so that oxygen is respectively introduced into the four oxychlorination reactors R-301, R-302, R-303 and R-304 according to a preset proportion, and the oxygen concentration is kept below the flammability limit.
Example 2
A four-stage reactor based oxychlorination reaction system comprising the four-stage reactor based oxychlorination reaction unit and the product post-treatment and ethylene recycle unit of example 1, wherein: the product post-treatment and ethylene circulation unit comprises a gas-liquid separation tank for gas-liquid separation, a discharge hole of a four-stage oxychlorination reactor at the tail end is communicated with a feed inlet of the gas-liquid separation tank, a liquid outlet of the gas-liquid separation tank is communicated with an ethylene recovery tower through a pipeline to remove dissolved ethylene, a filler is arranged in the ethylene recovery tower, a steam inlet pipeline is arranged at the lower part of the ethylene recovery tower, and the bottom of the ethylene recovery tower is communicated with an EDC water washing tank V-120 through a pipeline to collect dichloroethane.
Preferably, the gas-liquid separation tank is provided with two stages, namely an oxychlorination primary separation tank V-300 and an oxychlorination secondary separation tank V-310. The two gas-liquid separation tanks can both adopt a carbon steel container with a vertical PTFE lining.
The product post-treatment and ethylene circulation unit comprises an oxychlorination primary separating tank V-300, an oxychlorination secondary separating tank V-310 and an ethylene recovery tower T-300, a discharge hole of a four-stage oxychlorination reactor R-304 is communicated with the oxychlorination primary separating tank V-300 through a discharge pipeline to perform primary gas-liquid separation, a liquid outlet of the oxychlorination primary separating tank V-300 is respectively connected to the top of the ethylene recovery tower T-300 and an inlet pipeline of the oxychlorination primary separating tank V-300 through an output pipeline provided with an oxychlorination reactor product pump P-300A/B, a return pipeline between the oxychlorination reactor product pump P-300A/B and the top of the oxychlorination primary separating tank V-300 is provided with a condensed water cooler E-304, a top gas outlet of the ethylene recovery tower T-300 is connected to a pipeline between the four-stage oxychlorination reactor R-304 and the oxychlorination primary separation tank V-300, and a bottom liquid outlet of the ethylene recovery tower T-300 is connected to an EDC water washing tank V-120 through a pipeline provided with a water-cooled heat exchanger E-312;
the gas outlet of the primary oxychlorination separation tank V-300 is communicated with the inlet of the secondary oxychlorination separation tank V-310 through a pipeline provided with a condenser E-310 (a shell-and-tube graphite condenser) to carry out secondary gas-liquid separation, the liquid outlet of the secondary oxychlorination separation tank V-310 is communicated with the primary oxychlorination separation tank V-300, the gas outlet of the secondary oxychlorination separation tank V-310 is connected to the primary oxychlorination reactor R-301 through a pipeline provided with an Oxy circulating compressor C-300 to convey ethylene circulating gas, the outlet of the Oxy circulating compressor C-300 is also connected to a condensation tank V-311 through a pipeline provided with a gas condenser E-311, the top gas outlet of the condensation tank V-311 is connected to an Oxy purifying dryer D-310A/B, the bottom liquid outlet of the condensation tank V-311 is connected to the oxychlorination primary separating tank V-300 through a pipeline, and the Oxy purification dryer D-310A/B is respectively connected to the HDC reactor R-101 or the purified gas chlorination reactor R-102 through a pipeline.
Example 3
The oxychlorination reaction system based on four-stage reactor is to mix ethylene (C)2H4) Anhydrous hydrogen chloride (HCl) and oxygen (O)2) Using copper chloride (CuCl)2) Gas phase reaction with catalyst to produce dichloroethane (EDC: C)2H4Cl2) And water (H)2O). The reaction process is carried out in a series of four tubular fixed bed reactorsThe process is carried out in series. The use of a large excess of ethylene helps control the reaction temperature and maintain the oxygen concentration below the flammability limit. Unreacted ethylene is separated from the EDC and water, compressed and recycled back to the reactor system.
The overall reaction process on the catalyst bed;
C2H4(gas) +2HCl (gas) +1/2O2(gas) → C2H4Cl2(liquid) + H2O (liquid)
An oxychlorination reaction process comprising the steps of:
step 1, preheating hydrogen chloride to about 155 ℃, conveying the hydrogen chloride to a primary oxychlorination reactor, mixing ethylene preheated to about 155 ℃ with high-concentration ethylene circulating gas, conveying the mixture to the primary oxychlorination reactor, preheating oxygen to about 152-.
Specifically, hydrogen chloride (HCl) and ethylene (C) are used as raw materials to avoid dew point corrosion2H4) And oxygen (O)2) The feed to the primary oxychlorination reactor R-301 is started after preheating to 152-157 deg.C, preferably about 155 deg.C. Hydrogen Chloride (HCL) and ethylene (C) are fed to a primary oxychlorination reactor R-3012H4) And oxygen (O)2) Then the mixture is respectively sent into four oxychlorination reactors R-301, R-302, R-303 and R-304 according to the ratio of 30:30:30: 10. Pure ethylene (C)2H4) With high concentrations of ethylene (C)2H4) After the mixture of the circulating gas is sent into a first-stage oxychlorination reactor R-301.
The reaction mechanism of the four oxychlorination reactors is as follows:
total HCl and ethylene (C) after preheating2H4) With total oxygen (O) designed at 30% feed ratio2) Is sent into the first stageOxychlorination reactor R-301 in which dichloroethane (EDC: C) is formed at the desired oxychlorination unit reaction rate of 30%2H4Cl2) And water (H)2O) steam. The reaction takes place in the reactor tube over a copper chloride catalyst supported on an aluminum support base. The reaction process generates heat energy and the heat energy is removed by generating a high pressure vapor form of about 1.50 to 1.95MPaG, preferably 1.85 MPaG.
The gas leaving the primary oxychlorination reactor R-301 is mixed with oxygen (O)2) Combined and then sent to a secondary oxychlorination reactor R-302. Amount of oxygen (O) added to the secondary oxychlorination reactor R-3022) Supplied in the proportion required by the oxychlorination unit of about 30%, the starting material reacts to form more dichloroethane (EDC: C)2H4Cl2) And water (H)2O) steam. The heat of reaction is removed by generating a high pressure vapor form of about 1.50 to 1.95MPaG, preferably 1.85 MPaG.
The gas leaving the secondary oxychlorination reactor R-302 is mixed with oxygen (O)2) And combining and entering a three-stage oxychlorination reactor (R-303). Amount of oxygen (O) added to the three-stage oxychlorination reactor R-3022) Supplied in the proportion required by the oxychlorination unit of about 30%, the feed is reacted again to give more dichloroethane (EDC: C)2H4Cl2) And water (H)2O) steam. The heat of reaction is removed by high pressure steam which produces about 1.50 to 1.95MPaG, preferably 1.85 MPaG.
The gas leaving the tertiary oxychlorination reactor R-303 is mixed with the rest of the oxygen (O)2) Combined and enters a four-stage oxychlorination reactor R-304. Residual oxygen (O) required for oxychlorination unit2) Is fed into a four-stage oxychlorination reactor R-304 in a proportion of 10% and the feed is reacted to form more dichloroethane (EDC: C)2H4Cl2) And water (H)2O) steam. The heat of reaction is removed by high pressure steam which produces about 1.50 to 1.95MPaG, preferably 1.85 MPaG.
As the gas leaves the quaternary oxychlorination reactor R-304, nearly all of the oxygen (O2) and over 99.8% of the hydrogen chloride (HCl) react. All oxychlorination reactors (R-301, R-302, R-303, R-304) are atOperation in the rich (oxygen-lean) region, since a large excess of ethylene is used in the process to ensure oxygen (O)2) The concentration is below the flammability limit range.
The reaction temperature in each oxychlorination reactor can be controlled to a certain extent by properly adjusting the pressure of the steam drum on each oxychlorination reactor and the flow rate of the ethylene recycle gas to the first oxychlorination reactor R-301. The maximum temperature in the tubes of the oxychlorination reactors R-302, R-303, R-304 should be maintained at 265 ℃ and 270 ℃. The total ethylene/hydrogen chloride feed must be ensured and the hot spot temperature of the primary oxychlorination reactor R-301 will reach 280 ℃.
Step 2, a product discharged from a four-stage oxychlorination reactor R-304 enters an oxychlorination primary separation tank V-300 for primary gas-liquid separation, gas is separated from condensed EDC and water and then enters an oxychlorination secondary separation tank V-310 for secondary gas-liquid separation, liquid generated by separation is returned to the oxychlorination primary separation tank V-300, part of the gas is compressed by an oxychlorination circulating compressor C-300 and then is sent to a primary oxychlorination reactor R-301 to be used as ethylene circulating gas, part of the gas enters a condensation tank V-311 after being condensed by a gas condenser E-311, liquid generated by condensation of the condensation tank V-311 enters the oxychlorination primary separation tank V-300, uncondensed gas in the condensation tank V-311 is dried by an OXY purification dryer D-310A/B and then is sent to an HDC reactor R-101 or a purified gas chlorination reactor R-102 (ii) a
The liquid flow discharged from the primary oxychlorination separation tank V-300 consists of rich EDC and water, the water phase still contains a large amount of dissolved ethylene, part of the dissolved ethylene is pumped to an ethylene recovery tower T-300 by an oxychlorination reactor product pump P-300A/B, and part of the dissolved ethylene enters the primary oxychlorination separation tank V-300 after being condensed by a condensed water cooler E-304.
The oxychlorination primary separating tank V-300 and the oxychlorination secondary separating tank V-310 are vertical carbon steel containers lined with PTFE,
the residual water leaving the gas phase of the oxychlorination secondary separation tank V-310 is removed in an Oxy purge dryer D-310A/B. The Oxy purifying dryer D-310A/B is provided with an acid-proof molecular sieve. The dried purge gas is continuously analyzed for water content and then sent to either HDC reactor R-101 or purge gas chlorination reactor R-102.
And 3, separating the dissolved ethylene in the liquid phase products from the primary oxychlorination separation tank V-300 and the secondary separation tank V-310 by using medium-pressure steam (0.95MpaG) in the ethylene recovery tower T-300, conveying the top ethylene gas of the ethylene recovery tower into the primary oxychlorination separation tank V-300, and conveying the bottom liquid into an EDC water washing tank for washing to obtain the EDC.
The liquid from the oxychlorination primary separation tank V-300 is pumped to the top of an ethylene recovery column T-300, which is packed with random packing. Medium pressure steam is injected into the bottom of the ethylene recovery column T-300 under flow control. The overhead vapor, consisting essentially of EDC and water, as well as recovered ethylene, is sent to the oxychlorination primary drum V-300 before quenching. The bottom flow of the ethylene recovery tower T-300 is subjected to liquid level control through a water-cooled heat exchanger E-312 and then sent to an EDC water washing tank V-120.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The utility model provides an oxychlorination reaction unit based on four-stage reactor which characterized in that, includes four oxychlorination reactors that establish ties in proper order, wherein:
each oxychlorination reactor is a fixed bed reactor, each oxychlorination reactor is provided with a cooling mechanism, an oxygen pipeline is respectively communicated with each oxychlorination reactor through an oxygen branch pipeline, and a hydrogen chloride pipeline and an ethylene pipeline are communicated with the first-stage oxychlorination reactor at the head end.
2. The four-stage reactor based oxychlorination reaction unit according to claim 1, wherein each oxychlorination reactor is a tubular fixed bed reactor.
3. The oxychlorination reaction unit based on a four-stage reactor according to claim 1, wherein preheating means are provided on the oxygen line, the hydrogen chloride line and the ethylene line.
4. The four-stage reactor based oxychlorination reaction unit of claim 1, wherein the cooling mechanism is a high pressure steam thermal energy removal mechanism.
5. The oxychlorination reaction unit based on a four-stage reactor according to claim 1, wherein the four oxychlorination reactors are a primary oxychlorination reactor, a secondary oxychlorination reactor, a tertiary oxychlorination reactor and a quaternary oxychlorination reactor, respectively, the hydrogen chloride line and the ethylene line are in communication with the primary oxychlorination reactor, and the oxygen line is in communication with each oxychlorination reactor through an oxygen branch line, respectively.
6. An oxychlorination reaction system based on a four-stage reactor, comprising an oxychlorination reaction unit based on a four-stage reactor according to any one of claims 1-5, and a product post-treatment and ethylene recycle unit.
7. The oxychlorination reaction system based on the four-stage reactor according to claim 6, wherein the product post-treatment and ethylene circulation unit comprises a gas-liquid separation tank for gas-liquid separation, a discharge port of the four-stage oxychlorination reactor at the tail end is communicated with a feed port of the gas-liquid separation tank, a liquid outlet of the gas-liquid separation tank is communicated with an ethylene recovery tower through a pipeline to remove dissolved ethylene, the ethylene recovery tower is filled with a filler, a steam inlet pipeline is arranged at the lower part of the ethylene recovery tower, and the bottom of the ethylene recovery tower is communicated with an EDC water washing tank through a pipeline to collect dichloroethane.
8. The oxychlorination reaction system based on a four-stage reactor according to claim 7, wherein the gas-liquid separation tank is provided with two stages, namely, a primary oxychlorination separation tank and a secondary oxychlorination separation tank.
9. The oxychlorination reaction system based on a four-stage reactor according to claim 7, wherein the product post-treatment and ethylene circulation unit comprises a primary oxychlorination separation tank, a secondary oxychlorination separation tank and an ethylene recovery tower, wherein a discharge port of the four-stage oxychlorination reactor is communicated with the primary oxychlorination separation tank through a discharge pipe for performing the first gas-liquid separation, a liquid outlet of the primary oxychlorination separation tank is connected to the top of the ethylene recovery tower and an inlet pipeline of the primary oxychlorination separation tank through an output pipeline provided with a product pump of the oxychlorination reactor, a condensed water cooler is arranged on a return pipeline between the product pump of the oxychlorination reactor and the top of the primary oxychlorination separation tank, and a top gas outlet of the ethylene recovery tower is connected to a pipeline between the four-stage oxychlorination reactor and the primary oxychlorination separation tank, a bottom liquid outlet of the ethylene recovery tower is connected to an EDC water washing tank through a pipeline provided with a water-cooling heat exchanger;
the gas outlet of the primary oxychlorination separation tank is communicated with the inlet of the secondary oxychlorination separation tank for second gas-liquid separation through a pipeline provided with a condenser, the liquid outlet of the secondary oxychlorination separation tank is communicated with the primary oxychlorination separation tank, the gas outlet of the secondary oxychlorination separation tank is connected to the primary oxychlorination reactor through a pipeline provided with an Oxy circulating compressor so as to convey ethylene circulating gas, the outlet of the Oxy circulating compressor is connected to a condensation tank through a pipeline provided with a gas condenser, the top gas outlet of the condensation tank is connected to an Oxy purifying dryer, the bottom liquid outlet of the condensation tank is connected to the primary oxychlorination separation tank through a pipeline, and the Oxy purifying dryer is connected to an HDC reactor or a purified gas chlorination reactor through a pipeline respectively.
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