Dichloromethane waste gas treating method and system thereof

A dichloromethane and waste gas treatment technology, applied in separation methods, chemical instruments and methods, organic chemistry, etc., can solve problems such as damage to the health of operators, harm to the central nervous system and respiratory system, pollution, etc. Secondary pollution, good economic benefits, compact and simple structure

Active Publication Date: 2013-07-17
HANGZHOU ZHONGHUAN ENVIRONMENTAL ENG
View PDF5 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The boiling point of dichloromethane is 39.8°C, the melting point is -96.7°C, and the relative density is 1.33 (the density of water is 1). It has certain toxicity and is harmful to the human central nervous system and respiratory system, and its solution is also corrosive. sex
The direct discharge of dichloromethane waste gas will cause serious pollution to the atmospheric environment, cause damage to the health of operators, and affect the

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Dichloromethane waste gas treating method and system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1 The methylene chloride waste gas treatment system shown includes a methylene chloride waste gas inlet pipe 13, a pretreatment system, a condensation system, a recovery storage tank 3, a fan 4, and a solvent pump 5. The pretreatment system consists of a condenser 12 and a condensing system. The methylene chloride exhaust gas inlet pipe is connected to the lower end side of the condenser. The pipe connecting the condenser and the gas-to-air heat exchanger is provided with a fan 4, and the outlet of the fan exchanges heat with the gas The bottom pipe connection of the device.

[0030] The condensing system consists of two condensing towers, which are divided into a first condensing tower 2-1 and a second condensing tower 2-2. The first condensing tower and the second condensing tower are connected in series through pipelines. Each condensing tower is composed of a liquid nitrogen cryogenic section 6 formed by a condenser tube and a gas-gas exchange pre-coolin...

Embodiment 2

[0035] A methylene chloride waste gas treatment method using the system in Example 1, specifically as follows:

[0036] Step 1. Set the concentration to 1g / m 3 Above, air volume at 60m 3 The methylene chloride waste gas with a temperature above 20~35℃ and a temperature of 20~35℃ is transported to the tube condenser in the pretreatment system for cooling treatment, so that the temperature is reduced to 0~10℃, and the cooling medium is 5℃ freezing The brine then enters the condensing system.

[0037] Step 2: The exhaust gas after cooling treatment enters the condensation system for cryogenic treatment, and the cooling medium is liquid nitrogen. The condensing system consists of two condensing towers. Each condensing tower is divided into two sections, consisting of a liquid nitrogen cryogenic section and a gas-gas exchange pre-cooling section. After entering the tower, the exhaust gas first goes to the shell side and passes through the liquid nitrogen cryogenic section for cryogenic ...

Embodiment 3

[0040] The concentration is 2g / m 3 , Air volume at 100m 3 / h, the methylene chloride waste gas with a temperature of 30°C is piped to the tube condenser in the pretreatment system for cooling treatment, and the temperature is reduced to 10°C. The cooled waste gas enters two condensation towers for deep cooling. Cooling treatment, the cooling medium is liquid nitrogen. After entering the tower, the exhaust gas will go through the shell side and pass through the liquid nitrogen cryogenic section for cryogenic treatment. The temperature will be cooled to -94℃. Then the low-temperature tail gas will go through the tube side. After the gas-gas heat exchange, the liquid nitrogen is recovered Part of the cold energy after cryogenic cooling will then enter the second stage of condensation for cryogenic treatment to reduce the temperature of the exhaust gas to -144°C, and then discharge the treated exhaust gas at high altitude with an emission temperature of -40°C. The partial analysis t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the technical field of waste gas recovery and treatment, and relates to a dichloromethane waste gas treating method and a system thereof. The dichloromethane waste gas treating system comprises a dichloromethane waste gas inlet pipe, a pretreating system, a condensing system and a recovering system, wherein the pretreating system is formed by a condenser and a gas-to-gas heat exchanger connected with the condenser, the dichloromethane waste gas inlet pipe is connected with the condenser, a fan is arranged on a pipeline connecting the condenser with the gas-to-gas heat exchanger, and the condensing system is formed by two condensing towers including a primary condensing tower and a secondary condensing tower and capable of deeply condensing dichloromethane waste gas so as to enable the same to realize cooling crystallization. The invention further provides the dichloromethane waste gas treating method utilizing the dichloromethane waste gas treating system. The dichloromethane waste gas treating method is a cooling crystallization treating method and includes physical processes of cooling, crystallizing, resolving recovering and the like.

Description

technical field [0001] The invention belongs to the technical field of waste gas recovery and treatment, and relates to a methylene chloride waste gas treatment method and a system thereof. Background technique [0002] Dichloromethane has a pungent smell and is mainly used in film production and medicine in China. The boiling point of dichloromethane is 39.8°C, the melting point is -96.7°C, and the relative density is 1.33 (the density of water is 1). It has certain toxicity and is harmful to the human central nervous system and respiratory system, and its solution is also corrosive. sex. The direct discharge of methylene chloride waste gas will cause serious pollution to the atmospheric environment, damage the health of the operators, and affect the living environment of the surrounding residents. [0003] At present, the purification methods commonly used for organic waste gas include combustion method, adsorption method, absorption method and so on. The combustion met...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B01D53/00C07C19/03C07C17/392
Inventor 邵振华王百根胡佳斌
Owner HANGZHOU ZHONGHUAN ENVIRONMENTAL ENG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap