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Device and process for recovering carbon oxysulfide in chlorination process tail gas

A carbon oxysulfide and process tail gas technology, applied in the directions of carbon oxysulfide, carbon-sulfur compounds, steam condensation, etc., can solve the problems of increasing waste treatment costs, large solid waste and waste water, waste of carbon oxysulfide by-products, etc. The effect of high production value, reduction of raw material waste, and high degree of equipment integration

Pending Publication Date: 2021-04-13
浙江省天正设计工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment method not only wastes valuable by-products of carbon dioxide sulfide, but also generates a large amount of solid waste and wastewater, increasing the cost of waste treatment

Method used

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  • Device and process for recovering carbon oxysulfide in chlorination process tail gas

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Effect test

Embodiment 1

[0033] The invention recovers the carbon oxysulfide in the toluene-containing chlorination tail gas. The total flow rate of tail gas to be recovered is 100kg / h, wherein the mass fraction of carbon dioxide sulfide is 0.60, the mass fraction of hydrogen chloride is 0.38, and the mass fraction of toluene is 0.02. The outlet pressure of the tail gas compressor 4 is 2MPa, the refrigerant of the primary condenser 5 is circulating water, the refrigerant of the secondary condenser 7 is low-temperature water, and the refrigerant of the feed condenser 9 is -30°C cryogenic calcium chloride. The heating medium of the bottom reboiler 12 is 75°C hot water, and the cooling medium of the top condenser 11 is -30°C cryogenic calcium chloride. The recovered carbon oxysulfide flow rate is 48.87kg / h, the mass fraction is 0.992, and the recovery rate is 80.80%

Embodiment 2

[0035]The invention recovers the carbon oxysulfide in the ethanol-containing chlorination tail gas. The total flow rate of tail gas to be recovered is 100kg / h, in which the mass fraction of carbon oxysulfide is 0.55, the mass fraction of hydrogen chloride is 0.40, and the mass fraction of toluene is 0.05. The outlet pressure of exhaust compressor 4 is 2MPa, the refrigerant of primary condenser 5 is circulating water, the refrigerant of secondary condenser 7 is frozen ethylene glycol at -15°C, and the refrigerant of feed condenser 9 is cryogenic at -30°C Calcium chloride, the heating medium of the bottom reboiler 12 is 75°C hot water, and the cooling medium of the tower top condenser 11 is -30°C cryogenic calcium chloride. The flow rate of recovered carbon oxysulfide is 45.58kg / h, the mass fraction is 0.993, and the recovery rate is 82.29%.

Embodiment 3

[0037] The invention recovers the carbon oxysulfide in the chlorinated tail gas containing methylene chloride. The total flow rate of tail gas to be recovered is 100kg / h, wherein the mass fraction of carbon dioxide sulfide is 0.58, the mass fraction of hydrogen chloride is 0.39, and the mass fraction of toluene is 0.03. The outlet pressure of the tail gas compressor 4 is 2MPa, the refrigerant of the primary condenser 5 is low-temperature water, the refrigerant of the secondary condenser 7 is frozen ethylene glycol at -15°C, and the refrigerant of the feed condenser 9 is cryogenic at -30°C Calcium chloride, the heating medium of the bottom reboiler 12 is 75°C hot water, and the cooling medium of the tower top condenser 11 is -30°C cryogenic calcium chloride. The recovered carbon oxysulfide flow rate is 50.11kg / h, the mass fraction is 0.991, and the recovery rate is 85.62%.

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Abstract

The invention discloses a device and process for recovering carbon oxysulfide in chlorination process tail gas, and belongs to the technical field of tail gas recovery. The device comprises a tail gas compressor, a first-stage condenser, a first-stage gas-liquid separator, a second-stage condenser, a second-stage gas-liquid separator, a feeding condenser, a low-temperature rectifying tower, a tower top condenser, a tower bottom reboiler, a carbon oxysulfide product buffer tank and a carbon oxysulfide filling pump. The process comprises the following steps: compressing tail gas through the tail gas compressor, feeding the compressed tail gas into the first-stage condenser, the first-stage gas-liquid separator, the second-stage condenser and the second-stage gas-liquid separator for condensation separation, feeding the separated tail gas into the feeding condenser for condensation, performing rectification separation through the low-temperature rectifying tower, separating hydrogen chloride from the top of the tower, and separating carbon oxysulfide from the bottom of the tower, enabling the carbon oxysulfide to enter the carbon oxysulfide product buffer tank for temporary storage, and outputting the carbon oxysulfide by the carbon oxysulfide filling pump. The device is high in integration degree, reduces three-waste emission and raw material waste, and reduces the separation difficulty.

Description

technical field [0001] The invention belongs to the technical field of tail gas recovery and utilization, and in particular relates to a carbon oxysulfide recovery device and process in the tail gas of a chlorination process. Background technique [0002] Chlorination is the reaction of introducing chlorine atoms into the molecules of compounds. It is an important unit reaction in pharmaceutical and chemical industry, and has applications in various fields such as raw material medicine, agriculture, light industry, and rubber. The tail gas of the chlorination process often contains by-product hydrogen chloride, organic solvents and other by-products, which are complex in composition and difficult to recover. [0003] Solid phosgene is an important intermediate in pharmaceutical synthesis and pesticide manufacturing. It is used in the synthesis of fine chemicals such as chloroformate and acid chloride, drugs such as azlocillin and antihypertensives, carbamate pesticides, her...

Claims

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Application Information

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IPC IPC(8): C01B32/77B01D5/00B01D3/14B01D3/32
CPCB01D3/14B01D3/322B01D5/0036B01D5/006B01D5/009C01B32/77
Inventor 顾川川孔敏杨森陈杰赵志明
Owner 浙江省天正设计工程有限公司
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