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Heat-pump distillation technology for recycling dichloromethane solvent

A methylene chloride, heat recovery technology, applied in the preparation of halogenated hydrocarbons, chemical instruments and methods, organic chemistry and other directions, can solve the problems of high production energy consumption, high harm, high toxicity, etc., to reduce operating costs and save consumption Effect

Inactive Publication Date: 2016-06-22
JIANGSU LEKE ENERGY SAVING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dichloromethane is also used as a refrigerant in industrial refrigeration systems, but it is very harmful and can produce highly toxic phosgene when it comes into contact with open flames or hot objects
[0006] In this production process, the steam pressure at the top of the tower is much lower than the material temperature of the tower kettle, so the tower kettle must be preheated with a large amount of raw steam, and the production energy consumption is too high

Method used

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  • Heat-pump distillation technology for recycling dichloromethane solvent
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  • Heat-pump distillation technology for recycling dichloromethane solvent

Examples

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Embodiment 2

[0029] An enterprise uses dichloromethane as the extraction agent, and adopts rectification to recover the dichloromethane solvent. It requires the concentration of dichloromethane at the top of the tower to be higher than 95%, and the processing capacity is 10t / h, of which the dichloromethane content is 50%.

[0030] A dichloromethane solvent recovery heat pump rectification process is mainly composed of a rectification tower 1, a compressor 2, a reboiler 3 and a preheater 4. The rectification tower 1 adopts a packed tower, and the main separation task is completed in the tower, and the dichloromethane vapor 5 with a concentration of 95% is extracted from the top of the tower, and the dichloromethane vapor is boosted and heated through a steam compressor 2, and the compressed dichloromethane Methylene chloride vapor 6 is used as the heat source of reboiler 3. After heat exchange in reboiler, methylene chloride vapor is condensed into methylene chloride solution. After the liqu...

Embodiment 3

[0037] A factory uses dichloromethane as a solvent to produce a certain product, and needs to recover dichloromethane. The processing capacity is 2t / h, of which the content of dichloromethane is 40%, and the concentration of dichloromethane at the top of the tower is required to be greater than 80%.

[0038] A dichloromethane solvent recovery heat pump rectification process is mainly composed of a rectification tower 1, a compressor 2, a reboiler 3 and a preheater 4. The rectifying tower 1 adopts a packed tower, and the main separation task is completed in the tower, and the dichloromethane vapor 5 with 85% concentration is produced at the top of the tower, and the dichloromethane vapor is boosted and heated through a steam compressor 2, and the compressed dichloromethane Methylene chloride vapor 6 is used as the heat source of reboiler 3. After heat exchange in reboiler, methylene chloride vapor is condensed into methylene chloride solution. After the liquid phase is preheated...

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Abstract

The invention provides a heat-pump distillation technology for recycling a dichloromethane solvent and belongs to the field of heat-pump distillation. A feedstock (10) heated by a preheater enters a distillation tower (1), a main separation task is completed in the distillation tower, dichloromethane steam (5) with the concentration of 80%-99.99% is produced from a tower top and is subjected to boosting and heating by a steam compressor, compressed dichloromethane steam (6) enters the hot side of a reboiler (3), after the steam exchanges heat of a liquid phase at the bottom of the tower, condensate is the liquid phase, and the liquid phase passes through the hot side of the preheater (4); after the feedstock (10) is preheated, a part of the feedstock is taken as a tower top discharging material (7), and the other part is taken as tower top reflux (8); a tower bottom outlet is divided into two ways, one way is evaporated into a gas phase through the cold side of the reboiler (3) and enters the tower bottom, and the other way is taken as a tower bottom heavy-component discharging material (9); the operating pressure of the distillation tower is 100 kPa-400kPa, and the reflux ratio is 0.5-6; the compression ratio of the steam compressor is 1.5-6. According to the heat-pump distillation technology for recycling the dichloromethane solvent, the energy consumption in traditional production is reduced.

Description

technical field [0001] The invention belongs to the field of heat pump rectification and relates to a new process for dichloromethane solvent heat pump rectification. Background technique [0002] Dichloromethane has the advantages of strong solvency and low toxicity. It is widely used in the manufacture of safety film film and polycarbonate, and the rest is used as paint solvent, metal degreasing agent, gas mist propellant, polyurethane foaming agent, release agent, release agent, etc. Lacquer. [0003] Dichloromethane is a colorless liquid. It is used as a reaction medium in the pharmaceutical industry for the preparation of ampicillin, amoxicillin and cephalosporin, etc.; it is also used as a solvent in film production, petroleum dewaxing solvent, aerosol propellant, Organic synthetic extractant, foaming agent for foam production such as polyurethane and metal cleaning agent, etc. [0004] Dichloromethane is mainly used in film production and medicine in China. Among t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/383C07C19/03
CPCC07C17/383C07C19/03
Inventor 夏君君
Owner JIANGSU LEKE ENERGY SAVING TECH CO LTD
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