Integrated high-temperature direct chlorination system and method

Abstract

The invention discloses an integrated high-temperature direct chlorination system and method. In the high-temperature direct chlorination system, a high-temperature chlorination reactor and a high-temperature chlorination tower are combined into one. The high-temperature chlorination reactor is at the bottom. In addition to the function of the reactor itself, it can also serve as a reboiler of the high-temperature chlorination tower. The high-temperature chlorination tower at the top is a distillation tower, which can greatly reduce the floor space of the reactor and the distillation tower, while improving the thermal efficiency of the system and reducing the amount of steam used.

Description

Technical Field

[0001] The present invention relates to the field of chemical technology, and in particular to an integrated high-temperature direct chlorination system and method. Background Art

[0002] The high temperature direct chlorination (HDC) process is based on the chlorination of liquid ethylene dichloride with pure ethylene (C2H4), or by reacting a high excess of ethylene (C2H4) in the purge gas from the oxygen-based chlorination process with chlorine (Cl2) to produce gaseous ethylene dichloride (EDC: C2H4 Cl2).

[0003] The overall reaction on the catalyst bed is;

[0004] C2H4(gas)+Cl2(gas)→C2H4Cl2(vaporized)

[0005] The high temperature direct chlorination (HDC) process can be operated with either high excess ethylene or low excess ethylene feed. The purge gas containing high excess ethylene feed is sent to the purge chlorinator (R-101) to recover excess ethylene (C2H4), and the purge gas containing low excess ethylene feed is sent to gas incineration.

[0006] In the prior art, the chlorination reactor and the high-temperature chlorination tower in the high-temperature direct chlorination process are separated, the (preparation) replenishment pump of the chlorination reactor has frequent accidents, and the maintenance is time-consuming and labor-intensive. In addition, a large amount of heat is required to purify ethylene dichloride. Summary of the invention

[0007] The purpose of the present invention is to provide an integrated high-temperature direct chlorination system to solve the problem that the chlorination reactor and the high-temperature chlorination tower in the prior art are difficult to maintain if they are separated.

[0008] Another object of the present invention is to provide a high temperature direct chlorination method.

[0009] The technical solution adopted to achieve the purpose of the present invention is:

[0010] An integrated high-temperature direct chlorination module comprises a high-temperature chlorination tower T-101, a high-temperature chlorination tower reboiler E-101 connected to the lower part of the high-temperature chlorination tower through a circulation pipeline, and a high-temperature chlorination reactor R-101 connected to the bottom of the high-temperature chlorination tower through a circulation pipeline, wherein the high-temperature chlorination tower reboiler E-101 is located at the upper part of the high-temperature chlorination reactor R-101, a buffer tank V-101 is provided on the circulation pipeline, a heavy component outlet is provided at the bottom of the buffer tank V-101, a chlorine gas inlet and an ethylene inlet are provided on the high-temperature chlorination reactor R-101, and a mixed light end component outlet is provided at the top of the high-temperature chlorination tower.

[0011] In the above technical solution, a plurality of trays are arranged in the high temperature chlorination tower, preferably float valve trays.

[0012] In the above technical solution, the chlorine inlet is a chlorine distribution structure arranged in the high-temperature chlorination reactor R-101, and the ethylene inlet is an ethylene distribution structure arranged in the high-temperature chlorination reactor R-101.

[0013] Another aspect of the present invention is an integrated high-temperature direct chlorination unit, comprising the integrated high-temperature direct chlorination module and the HDC product tower T-102;

[0014] The heavy component outlet of the high-temperature chlorination tower is connected to the HDC tar kettle system through a pipeline, and the light end component outlet of the high-temperature chlorination tower is connected to the lower part of the HDC product tower T-102 through a pipeline. The top of the HDC product tower T-102 is the gas phase material outlet, and the bottom is the dichloroethane product outlet. The HDC product tower T-102 is provided with a tower tray, preferably a sieve plate tower tray.

[0015] In the above technical solution, the dichloroethane product outlet is connected to the dichloroethane storage tank TK-401 through an output pipeline, and a product pump P-103A / B and a product condenser E-103 are provided on the output pipeline. The output pipeline is also connected to the top of the high-temperature chlorination tower through a branch for reflux.

[0016] In the above technical scheme, the gas phase material outlet of the HDC product tower T-102 is connected with the inlet of the reflux tank V-101 through a pipeline, and a T-102 top condenser E-102 is provided on the pipeline between the HDC product tower T-102 and the reflux tank V-101. The liquid outlet of the reflux tank V-101 is connected with the HDC product tower T-102 through a reflux pipeline and is connected with the EDC washing system through a conveying pipeline.

[0017] Another aspect of the present invention is an integrated high-temperature direct chlorination system, comprising the integrated high-temperature direct chlorination unit and a HDC tail gas recovery system for processing and / or a HDC tar kettle system connected to the heavy component outlet.

[0018] In the above technical scheme, the HDC exhaust gas recovery system includes a T-102 exhaust condensate tank V-104, the gas outlet of the reflux tank V-101 is connected to the inlet of the T-102 exhaust condensate tank V-104 through a pipeline, a T-102 exhaust condenser E-104 is provided on the pipeline between the gas outlet of the reflux tank V-101 and the T-102 exhaust condensate tank V-104, the liquid outlet of the T-102 exhaust condensate tank V-104 is connected to the EDC washing system through a condensate discharge pipeline, a V-104 condensate pump P-104A / B is provided on the condensate discharge pipeline, the gas outlet of the T-102 exhaust condensate tank V-104 is connected to the HDC exhaust compressor C-101A / B through a pipeline, and the HDC exhaust compressor C-101A / B is connected to the LDC reactor.

[0019] In the above technical solution, the HDC tar kettle system includes a HDC tar kettle E-140 with a steam jacket and a HDC tar kettle EDC tower T-140; the heavy component outlet at the bottom of the buffer tank V-101 is connected to the feed port of the HDC tar kettle E-140 through a pipeline provided with a heavy component pump P101A / B;

[0020] The top gas outlet of the HDC tar kettle E-140 is connected to the HDC tar kettle EDC tower T-140, the top outlet of the HDC tar kettle EDC tower T-140 is connected to the T-140 reflux tank V-140 through a pipeline, and a T-140 top condenser E-142 is provided on the pipeline between the top outlet of the HDC tar kettle EDC tower T-140 and the T-140 reflux tank V-140;

[0021] The bottom outlet of the HDC tar kettle E-140 is refluxed to the top of the HDC tar kettle E-140 through the kettle circulation pump P-140A / B, and the outlet of the kettle circulation pump P-140A / B is also connected to the heavy component storage TK-405 through a pipeline;

[0022] The bottom outlet of the HDC tar kettle EDC tower T-140 is connected to the heavy component storage TK-405 through a pipeline provided with a bottom reflux pump P-141A / B, and the outlet of the bottom reflux pump P-141A / B is also connected to the bottom of the HDC tar kettle EDC tower T-140 through a bottom reflux pipeline. A bottom reboiler E-141 is provided on the bottom reflux pipeline, and the bottom outlet of the HDC tar kettle E-140 is also connected to the heavy component storage TK-405 through a pipeline; the T-140 reflux tank V- The liquid outlet of 140 is refluxed to the top of the HDC tar kettle EDC tower T-140 and the circulating EDC tower T-240 through the pipeline connection of the top reflux pump P-142A / B respectively. The circulating EDC tower T-240 is also connected to the heavy component storage TK-405 through a pipeline. The gas outlet of the T-140 reflux tank V-140 is connected to the HDC tar kettle vacuum pump C-140A / B through a pipeline. The HDC tar kettle vacuum pump C-140A / B is connected to the accident washing tower T-270 through a pipeline.

[0023] In another aspect of the present invention, a high temperature direct chlorination method is provided, wherein ethylene and chlorine are introduced into a high temperature chlorination reactor R-101 according to a molar ratio to generate liquid ethylene dichloride, and a vapor / liquid mixture with a relatively low density in the high temperature chlorination reactor R-101 promotes the circulation of liquid ethylene dichloride between the high temperature chlorination reactor R-101 and a high temperature chlorination tower through a circulation pipeline, and the vapor material leaving the high temperature chlorination reactor R-101 is directed upward through the high temperature chlorination tower and separated therein to separate the heavy components.

[0024] In the above technical solution, the high temperature direct chlorination method further comprises the following steps:

[0025] After leaving the top of the high-temperature chlorination tower, the gas phase is introduced into the lower part of the HDC product tower T-102 to distill ethylene dichloride from the mixed light end components. The final product ethylene dichloride at the bottom of the HDC product tower T-102 is pumped into the ethylene dichloride storage tank.

[0026] In the above technical solution, the high temperature direct chlorination method includes a tail gas treatment step and / or a heavy component treatment step; the tail gas treatment step:

[0027] When leaving the top of HDC product tower T-102, the gas phase material is condensed in T-102 top condenser E-102;

[0028] The HDC tail gas discharged from the reflux tank V-101 is processed by the HDC tail gas recovery system. After being condensed by the T-102 exhaust condenser E-104, the HDC tail gas enters the T-102 exhaust condensate tank V-104. The condensate discharged from the exhaust condensate tank V-104 is pumped to the EDC washing system by the V-104 condensate pump P-104A / B. The non-condensable matter and inert gas discharged from the exhaust condensate tank V-104 are sent to the purification chlorinator R-102 for incineration through the HDC exhaust compressor C-101A / B.

[0029] The heavy component processing steps:

[0030] The heavy component enters the HDC tar kettle E-140, and the liquid after vaporization of the HDC tar kettle E-140 is sent to the HDC tar kettle EDC tower T-140. The tar, iron ion compounds and high boiling materials accumulated at the bottom of the HDC tar kettle E-140 and the HDC tar kettle EDC tower T-140 need to be intermittently sent to the heavy component storage TK-405; the steam material from the top of the HDC tar kettle EDC tower T-140 is condensed and collected in the T-140 reflux tank V-140, and part of the recovered ethylene dichloride is pumped back to the HDC tar kettle EDC tower T-140 for reflux, and the rest is pumped to the circulating EDC tower T-240; the uncondensed matter in the T-140 top condenser E-142 is pumped to the accident washing tower T-270 through the HDC tar kettle vacuum pump C-140A / B.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The high-temperature direct chlorination method of the present invention has high selectivity for ethylene and chlorine, has few by-products, does not require a catalyst for direct chlorination, and is green and environmentally friendly.

[0033] 2. The high temperature direct chlorination method of the present invention can be used to rectify EDC by utilizing the reaction heat, with low utility consumption, low steam and cooling water requirements. The refining process of ethylene dichloride is simplified, and when ethylene dichloride is transferred from the high temperature chlorination reactor to the high temperature chlorination tower, the reaction heat generated can be directly used to purify EDC.

[0034] 3. When the high temperature chlorination reactor and the high temperature chlorination tower are operated as one, the probability of stopping is very low, and the quality of HDC products is easy to control. The design of the combined tower kettle has the characteristics of low maintenance and long online operation time. It can achieve more than 98% long online time operation (excluding annual inspection time). The operation process of this system is fully automated, including the characteristics of allowing the system to be safely stopped in an emergency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Shown is a process flow chart of high temperature direct chlorination.

[0036] Figure 2 It is the process flow chart of HDC tar kettle system. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] Example 1 1.1

[0040] An integrated high-temperature direct chlorination module comprises a high-temperature chlorination tower T-101, a high-temperature chlorination tower reboiler E-101 connected to the lower part of the high-temperature chlorination tower through a circulation pipeline, and a high-temperature chlorination reactor R-101 connected to the bottom of the high-temperature chlorination tower through a circulation pipeline, wherein the high-temperature chlorination tower reboiler E-101 is located at the upper part of the high-temperature chlorination reactor R-101, a buffer tank V-101 is provided on the circulation pipeline, a heavy component outlet is provided at the bottom of the buffer tank V-101, a chlorine gas inlet and an ethylene inlet are provided on the high-temperature chlorination reactor R-101, and a mixed light end component outlet is provided at the top of the high-temperature chlorination tower.

[0041] The buffer tank V-101 can play a buffering role. When the vehicle is stopped, EDC is pumped into the buffer tank V-101. The high-temperature chlorination tower is provided with a plurality of trays, preferably float valve trays.

[0042] The high-temperature direct chlorination system of this process adopts a unique conjoined structure, combining the traditional high-temperature chlorination reactor and the high-temperature chlorination tower into one. The medium-pressure steam consumption of the traditional structure is 22 tons / hour. After adopting the conjoined structure, the energy consumption is reduced to 0. The high-temperature chlorination reactor is at the bottom. In addition to the role of the reactor itself, it can also serve as the reboiler of the high-temperature chlorination tower. The high-temperature chlorination tower at the top is a distillation tower, and more preferably a floating valve tower with 45 trays. Compared with the existing split equipment form, this can greatly reduce the footprint of the reactor and the distillation tower, while improving the thermal efficiency of the system and reducing the amount of steam used.

[0043] Preferably, the lower part of the high temperature chlorination tower is provided with a high temperature chlorination tower reboiler E-101 connected thereto, and the high temperature chlorination reactor R-101 is installed at the bottom of the high temperature chlorination tower. The high temperature chlorination tower reboiler E-101 is located at the upper part of the high temperature chlorination reactor R-101, and the high temperature chlorination reactor R-101 provides a circulation path for liquid ethylene dichloride from the bottom of the high temperature chlorination tower to the reaction area near the bottom of the high temperature chlorination reactor R-101, and then returns to the high temperature chlorination tower to form a circulating liquid.

[0044] Conventional distillation tower is divided into rectifying section, stripping section and reboiler, and reboiler is connected with the bottom of rectifying tower.And the reboiler in the present embodiment is connected with the middle lower position of high temperature chlorination tower.In high temperature chlorination reactor R-101, liquid movement is realized by density difference, so that vapor / liquid is separated in high temperature chlorination tower.High temperature chlorination tower reboiler E-101 is only used when high temperature chlorination reactor just starts.After high temperature chlorination reactor is operated, high temperature chlorination tower reboiler E-101 does not work, and energy consumption is 0.

[0045] Preferably, the ethylene distribution structure is located at the bottom of the chlorine distribution structure. Both the chlorine distribution structure and the ethylene distribution structure may adopt distributors or nozzles, preferably Inconel distributors or nozzles having many small diameter holes.

[0046] In the high temperature chlorination reactor R-101, chlorine (Cl2) is introduced into the circulating liquid through the chlorine distribution structure. Ethylene (C2H4) is introduced below the chlorine (Cl2) through the ethylene distribution structure. In the high temperature chlorination reactor R-101, ethylene reacts with chlorine to form EDC. The heat of reaction triggers vaporization and rises to the high temperature chlorination tower.

[0047] Furthermore, the bottom materials of the high temperature chlorination reactor R-101 and the high temperature chlorination tower are both monel coated carbon steel. The high temperature chlorination tower is provided with a plurality of trays, preferably float valve trays. 1.2

[0049] A high-temperature direct chlorination unit, comprising the high-temperature direct chlorination module as described in 1.1 and a HDC product tower T-102, wherein the mixed light end component outlet of the high-temperature chlorination tower T-101 is connected to the lower part of the HDC product tower T-102 through a pipeline, the top of the HDC product tower T-102 is a gas phase material outlet, and the bottom is a dichloroethane product outlet. The tower body of the HDC product tower T-102 is made of carbon steel material, and the internal tower tray is a carbon steel tower tray, preferably a sieve plate tower tray.

[0050] Furthermore, the dichloroethane product outlet is connected to the dichloroethane storage tank TK-401 through an output pipeline, and a product pump P-103A / B and a product condenser E-103 are arranged on the output pipeline. The outlet of the product pump P-103A / B is also connected to the top of the high-temperature chlorination tower through a branch for reflux.

[0051] Furthermore, the gas phase material outlet of the HDC product tower T-102 is connected to the inlet of the reflux tank V-101 through a pipeline, and a T-102 top condenser E-102 is provided on the pipeline between the HDC product tower T-102 and the reflux tank V-101, and the liquid outlet of the reflux tank V-101 is connected to the HDC product tower T-102 through a reflux pipeline and is connected to the EDC washing system through a conveying pipeline.

[0052] Example 2

[0053] A high-temperature direct chlorination system comprises a high-temperature direct chlorination unit as described in Example 1.2 and a HDC tail gas recovery system.

[0054] Specifically, the HDC tar kettle system includes a HDC tar kettle E-140 with a steam jacket and a HDC tar kettle EDC tower T-140; the heavy component outlet at the bottom of the buffer tank V-101 is connected to the feed port of the HDC tar kettle E-140 through a pipeline provided with a heavy component pump P101A / B;

[0055] The top gas outlet of the HDC tar kettle E-140 is connected to the HDC tar kettle EDC tower T-140, the top outlet of the HDC tar kettle EDC tower T-140 is connected to the T-140 reflux tank V-140 through a pipeline, and a T-140 top condenser E-142 is provided on the pipeline between the top outlet of the HDC tar kettle EDC tower T-140 and the T-140 reflux tank V-140;

[0056] The bottom outlet of the HDC tar kettle E-140 is refluxed to the top of the HDC tar kettle E-140 through the kettle circulation pump P-140A / B, and the outlet of the kettle circulation pump P-140A / B is also connected to the heavy component storage TK-405 through a pipeline;

[0057] The bottom outlet of the HDC tar kettle EDC tower T-140 is connected to the heavy component storage TK-405 through a pipeline provided with a bottom reflux pump P-141A / B, and the outlet of the bottom reflux pump P-141A / B is also connected to the bottom of the HDC tar kettle EDC tower T-140 through a bottom reflux pipeline. A bottom reboiler E-141 is provided on the bottom reflux pipeline, and the bottom outlet of the HDC tar kettle E-140 is also connected to the heavy component storage TK-405 through a pipeline; the T-140 reflux tank V- The liquid outlet of 140 is refluxed to the top of the HDC tar kettle EDC tower T-140 and the circulating EDC tower T-240 through the pipeline connection of the top reflux pump P-142A / B respectively. The circulating EDC tower T-240 is also connected to the heavy component storage TK-405 through a pipeline. The gas outlet of the T-140 reflux tank V-140 is connected to the HDC tar kettle vacuum pump C-140A / B through a pipeline. The HDC tar kettle vacuum pump C-140A / B is connected to the accident washing tower T-270 through a pipeline.

[0058] Example 3

[0059] A high temperature direct chlorination method comprises the following steps:

[0060] Step 1, ethylene (C2H4) and chlorine (Cl2) are introduced into a high-temperature chlorination reactor R-101 according to a molar ratio to generate liquid ethylene dichloride. The vapor / liquid mixture with a lower density in the high-temperature chlorination reactor R-101 promotes the circulation of liquid ethylene dichloride (HDC:C2H4Cl2) between the high-temperature chlorination reactor R-101 and the high-temperature chlorination tower through a circulation pipeline. The steam material leaving the high-temperature chlorination reactor R-101 is guided upward through the high-temperature chlorination tower and separated therein. The heavy component is continuously extracted from the bottom of the high-temperature chlorination tower and sent to the HDC tar kettle system.

[0061] Preferably, the molar ratio of ethylene (C2H4) to chlorine (Cl2) is (1.01-1.10):1, preferably 1.05:1, to ensure excess ethylene to inhibit side reactions, wherein the chlorine feed temperature is 35-45°C, preferably 40°C, and the pressure is 0.40-0.45MpaG, preferably 0.42MpaG; the ethylene feed temperature is 35-40, preferably 39°C, and the pressure is 0.25-0.32MpaG, preferably 0.29MpaG. The heavy components continuously extracted from the bottom of the high-temperature chlorination tower are mainly dichloroethane, trichlorobutene, trichloroethane, and tetrachloroethane.

[0062] Furthermore, the chlorine (Cl2) feed contains gaseous oxygen (O2) greater than 0.5% by volume, which inhibits the substitution reaction between chlorine (Cl2) and dichloroethane (EDC: C2H4Cl2) to generate 1,1,2-trichloroethane (and further tetrachloroethane and pentachloroethane).

[0063] Furthermore, the liquid level of the high temperature chlorination tower is maintained by pumping the bottom of the HDC product tower T-102. The pressure at the bottom of the high temperature chlorination tower is controlled at 0.10-015 MPaG, preferably 0.12 MPaG.

[0064] Step 2, after leaving the top of the high-temperature chlorination tower, the gas phase material is introduced into the lower part of the HDC product tower T-102, and ethylene dichloride (EDC: C2H4Cl2) is distilled from the mixed light end components, and the final product ethylene dichloride (EDC: C2H4Cl2) at the bottom of the HDC product tower T-102 is pumped into the ethylene dichloride (EDC: C2H4Cl2) storage tank;

[0065] When leaving the top of HDC product tower T-102, the gas phase is condensed in T-102 top condenser E-102 using cooling water;

[0066] Furthermore, the condensate from the T-102 top condenser E-102 is returned to the HDC product tower T-102 as reflux by controlling the liquid level of the reflux tank V-101.

[0067] Step 3, the HDC tail gas discharged from the reflux tank V-101 is processed by the HDC tail gas recovery system, and the HDC tail gas is condensed by the T-102 exhaust condenser E-104, and then enters the T-102 exhaust condensate tank V-104, and the condensate (EDC, a small amount of trichloroethylene, ethyl chloride, benzene) discharged from the exhaust condensate tank V-104 is pumped to the EDC washing system by the V-104 condensate pump P-104A / B, and the non-condensable matter and inert gas (ethylene, a small amount of nitrogen, oxygen, carbon dioxide, HCL) discharged from the exhaust condensate tank V-104 are sent to the purification chlorinator R-102 through the HDC exhaust compressor C-101.

[0068] Ethylene (C2H4) is used to control the exhaust gas outside the flammable area. Three oxygen analyzers are installed on the outlet pipe of HDC exhaust compressor C-101 to monitor the exhaust gas, and the shutdown procedure is triggered according to the voting circuit of the three oxygen analyzers.

[0069] The tail gas mainly contains nitrogen, ethylene, non-condensables and a small amount of organic matter, which are sent to the purification chlorinator R-102. Non-condensables and inert gases from the feed raw material flow are sent to incineration through the purification chlorinator R-102.

[0070] 3.2 The HDC tar kettle system in 3.1 is described in detail.

[0071] The liquid level of HDC tar kettle E-140 is maintained by controlling the steam in the jacket of HDC tar kettle E-140. The liquid after vaporization of HDC tar kettle E-140 is sent to HDC tar kettle EDC tower T-140. The tar, iron ion compounds and high boiling products accumulated at the bottom of HDC tar kettle E-140 and HDC tar kettle EDC tower T-140 need to be intermittently sent to the heavy component storage TK-405. The iron ion compounds include ferric chloride generated by the reaction of chlorine and steel equipment. This part is sufficient as a catalyst and does not need to be added externally.

[0072] The steam material from the top of the HDC tar kettle EDC tower T-140 is condensed, 60-65°C before condensation, preferably 62°C, and 52-57°C after condensation, preferably 55°C, and is collected in the T-140 reflux tank V-140. Part of the recovered ethylene dichloride (EDC: C2H4Cl2) is pumped back to the HDC tar kettle EDC tower T-140 for reflux, and the rest is pumped to the circulating EDC tower T-240T-240.

[0073] The uncondensed materials (EDC, a small amount of HCL, trichloroethylene, ethyl chloride, benzene) in the top condenser E-142 of T-140 tower are pumped to the accident washing tower T-270 through the HDC tar kettle vacuum pump C-140A / B.

[0074] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A high-temperature direct chlorination method based on an integrated high-temperature direct chlorination module, It is characterized in that The integrated high-temperature direct chlorination module comprises a high-temperature chlorination tower, a high-temperature chlorination tower reboiler connected to the lower part of the high-temperature chlorination tower through a circulation pipeline, and a high-temperature chlorination reactor connected to the bottom of the high-temperature chlorination tower through a circulation pipeline, the high-temperature chlorination tower reboiler is located at the upper part of the high-temperature chlorination reactor, a buffer tank is provided on the circulation pipeline, a heavy component outlet is provided at the bottom of the buffer tank, a chlorine inlet and an ethylene inlet are provided on the high-temperature chlorination reactor, and a mixed light end component outlet is provided at the top of the high-temperature chlorination tower; The high temperature chlorination reactor and the high temperature chlorination tower adopt a joint structure. The high temperature chlorination reactor provides a circulation path for liquid ethylene dichloride from the bottom of the high temperature chlorination tower to the reaction area near the bottom of the high temperature chlorination reactor, and then returns to the high temperature chlorination tower to form a circulating liquid; The high temperature direct chlorination method comprises the following steps: Ethylene and chlorine are introduced into a high temperature chlorination reactor according to a molar ratio to generate liquid ethylene dichloride. The vapor / liquid mixture with a lower density in the high temperature chlorination reactor promotes the circulation of liquid ethylene dichloride between the high temperature chlorination reactor and the high temperature chlorination tower through a circulation pipeline. The vapor material leaving the high temperature chlorination reactor is guided upward through the high temperature chlorination tower and separated therein to separate the heavy component. The high-temperature chlorination tower reboiler is only used when the high-temperature chlorination reactor is just started up. After the high-temperature chlorination reactor is running, the high-temperature chlorination tower reboiler does not work.

2. The high temperature direct chlorination method according to claim 1, It is characterized in that A plurality of tower plates are arranged in the high-temperature chlorination tower.

3. The high temperature direct chlorination method according to claim 1, It is characterized in that The chlorine inlet is a chlorine distribution structure arranged in the high-temperature chlorination reactor, and the ethylene inlet is an ethylene distribution structure arranged in the high-temperature chlorination reactor.

4. The high temperature direct chlorination method according to claim 1, It is characterized in that The mixed light end component outlet of the high temperature chlorination tower is connected to the lower part of the HDC product tower through a pipeline. The top of the HDC product tower is the gas phase material outlet, and the bottom is the dichloroethane product outlet. The HDC product tower is provided with a tower tray.

5. The high temperature direct chlorination method according to claim 4, It is characterized in that The dichloroethane product outlet is connected to the dichloroethane storage tank through an output pipeline, and a product pump and a product condenser are arranged on the output pipeline. The outlet of the product pump is also connected to the top of the high-temperature chlorination tower through a branch for reflux.

6. The high temperature direct chlorination method according to claim 4, It is characterized in that The gas phase material outlet of the HDC product tower is connected to the inlet of the reflux tank through a pipeline, a top condenser is arranged on the pipeline between the HDC product tower and the reflux tank, and the liquid outlet of the reflux tank is connected to the HDC product tower through a reflux pipeline and is connected to the EDC washing system through a conveying pipeline.

7. The high temperature direct chlorination method according to claim 6, It is characterized in that It also includes a HDC tail gas recovery system and / or a HDC tar kettle system connected to the heavy component outlet.

8. The high temperature direct chlorination method according to claim 7, It is characterized in that The HDC tail gas recovery system comprises an exhaust condensate tank, the gas outlet of the reflux tank is connected to the inlet of the exhaust condensate tank through a pipeline, an exhaust condenser is arranged on the pipeline between the gas outlet of the reflux tank and the exhaust condensate tank, the liquid outlet of the exhaust condensate tank is connected to the EDC washing system through a condensate discharge pipeline, a condensate pump is arranged on the condensate discharge pipeline, the gas outlet of the exhaust condensate tank is connected to the HDC exhaust compressor through a pipeline, and the HDC exhaust compressor is connected to the purification chlorinator; The HDC tar kettle system includes a HDC tar kettle with a steam jacket and a HDC tar kettle EDC tower; the heavy component outlet at the bottom of the buffer tank is connected to the feed port of the HDC tar kettle through a pipeline provided with a heavy component pump; The top gas outlet of the HDC tar kettle is connected to the HDC tar kettle EDC tower, the top outlet of the HDC tar kettle EDC tower is connected to a reflux tank through a pipeline, and a top condenser is provided on the pipeline between the top outlet of the HDC tar kettle EDC tower and the reflux tank; The bottom outlet of the HDC tar kettle is refluxed to the top of the HDC tar kettle through a kettle circulation pump, and the outlet of the kettle circulation pump is also connected to the heavy component storage through a pipeline; The bottom outlet of the HDC tar kettle EDC tower is connected to the heavy component storage through a pipeline provided with a bottom reflux pump, and the outlet of the bottom reflux pump is also connected to the bottom of the HDC tar kettle EDC tower through a bottom reflux pipeline, and a bottom reboiler is provided on the bottom reflux pipeline; The liquid outlet of the reflux tank is connected to the top of the HDC tar kettle EDC tower and the circulating EDC tower through the pipeline of the top reflux pump respectively. The circulating EDC tower is also connected to the heavy component storage through a pipeline. The gas outlet of the reflux tank is connected to the HDC tar kettle vacuum pump through a pipeline, and the HDC tar kettle vacuum pump is connected to the accident washing tower through a pipeline.

9. The high temperature direct chlorination method according to claim 1, It is characterized in that The following steps are also included: After leaving the top of the high-temperature chlorination tower, the gas phase material is introduced into the lower part of the HDC product tower to distill ethylene dichloride from the mixed light end components. The final product ethylene dichloride at the bottom of the HDC product tower is pumped into the ethylene dichloride storage tank.

10. The high temperature direct chlorination method according to claim 9, It is characterized in that It also includes a tail gas treatment step and / or a heavy component treatment step; The tail gas treatment steps: When leaving the top of the HDC product tower, the vapor phase is condensed in the overhead condenser; The HDC tail gas discharged from the reflux tank is processed by the HDC tail gas recovery system. After being condensed by the exhaust condenser, the HDC tail gas enters the exhaust condensate tank. The condensate discharged from the exhaust condensate tank is pumped to the EDC washing system by the condensate pump. The non-condensables and inert gases discharged from the exhaust condensate tank are sent to the purification chlorinator through the HDC exhaust compressor for incineration; The heavy component processing steps: The heavy component enters the HDC tar kettle, and the liquid after HDC tar kettle vaporization is sent to the HDC tar kettle EDC tower. The tar, iron ion compounds and high boiling products accumulated in the HDC tar kettle and the bottom of the HDC tar kettle EDC tower need to be intermittently sent to the heavy component storage; the steam material from the top of the HDC tar kettle EDC tower is condensed and collected in the EDC tower reflux tank. Part of the recovered ethylene dichloride is pumped back to the HDC tar kettle EDC tower for reflux, and the rest is pumped to the circulating EDC tower; The uncondensed material in the top condenser is pumped to the emergency washing tower through the HDC tar kettle vacuum pump.

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