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Method for treating chlorotoluene rectification tail gas

A treatment method, the technology of chlorotoluene, applied in the direction of gas treatment, separation method, chemical instrument and method, etc., can solve the problem of low added value of acid, achieve high recovery efficiency, avoid resource waste, and achieve good separation effect

Inactive Publication Date: 2020-05-08
NJTECH ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the inorganic components contain more organic impurities, the added value of the acid produced is very low, so it can only be used in pickling, phosphating and other industries.

Method used

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  • Method for treating chlorotoluene rectification tail gas
  • Method for treating chlorotoluene rectification tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] According to the above method, the mixed waste gas containing hydrogen chloride, toluene and chlorotoluene is treated. The main devices used in this embodiment include a chlorotoluene rectification tower, a toluene rectification tower, and a hydrogen chloride rectification tower, all of which are stainless steel packed towers with ceramic fillers inside. Spray seals are 4m respectively 3 / (m 2 , h), 5m 3 / (m 2 , h), 5m 3 / (m 2 , h), 4m 3 / (m 2 , h).

[0031] The composition of the mixed waste gas containing hydrogen chloride, toluene and chlorotoluene is 1wt% toluene, 1.5wt% chlorotoluene, and the rest is 97.5wt% hydrogen chloride.

[0032] The solvent A used is methanol, the solvent B used is clay, and the solvent C used is n-butanol.

[0033] The saturated solvent A is desorbed in the rectification tower at a temperature of 170°C to obtain chlorotoluene with a product purity of 98%. The saturated solvent B is desorbed in a rectification tower at a temperature ...

Embodiment 2

[0035] According to the above method, the mixed waste gas containing hydrogen chloride, toluene and chlorotoluene is treated. The main devices used in this embodiment include a chlorotoluene rectification tower, a toluene rectification tower, and a hydrogen chloride rectification tower, all of which are stainless steel packed towers with ceramic fillers inside. Spray seals are 7m respectively 3 / (m 2 , h), 8m 3 / (m 2 , h), 6m 3 / (m 2 , h), 8m 3 / (m 2 , h).

[0036] The composition of the mixed waste gas containing hydrogen chloride, toluene and chlorotoluene is 1.5wt% toluene, 1.0wt% chlorotoluene, and the rest is 97.5wt% hydrogen chloride.

[0037] The solvent A used is butylsulfone, the solvent B used is clay, and the solvent C used is glycerol.

[0038] The saturated solvent A is desorbed in the rectification tower at a temperature of 120°C to obtain chlorotoluene with a product purity of 96%. The saturated solvent B is desorbed in a rectification tower at a tempera...

Embodiment 3

[0040] According to the above method, the mixed waste gas containing hydrogen chloride, toluene and chlorotoluene is treated. The main devices used in this embodiment include a chlorotoluene rectification tower, a toluene rectification tower, and a hydrogen chloride rectification tower, all of which are stainless steel packed towers with ceramic fillers inside. Spray seals are 5m respectively 3 / (m 2 , h), 7m 3 / (m 2 , h), 4m 3 / (m 2 , h), 6m 3 / (m 2 , h).

[0041] The composition of the mixed waste gas containing hydrogen chloride, toluene and chlorotoluene is 4.0wt% toluene, 3.0wt% chlorotoluene, and the rest is 93wt% hydrogen chloride.

[0042] The solvent A used is butylsulfone, the solvent B used is clay, and the solvent C used is diethyl carbonate.

[0043]The saturated solvent A is desorbed in the rectification tower at a desorption temperature of 190°C to obtain chlorotoluene with a product purity of 97%. The saturated solvent B is desorbed in a rectification t...

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Abstract

The invention discloses a treatment method of chlorotoluene rectification tail gas in the field of tail gas treatment. The method is characterized by comprising the following steps of: sequentially introducing the mixed waste gas containing hydrogen chloride, methylbenzene and chlorotoluene into rectifying towers with a solvent A, a solvent B and a solvent C as absorbents; separating and adsorbinghydrogen chloride, toluene and chlorotoluene. By means of the combination of the solvent A, solvent B and solvent C, mixed waste gas containing hydrogen chloride, methylbenzene and chlorotoluene is absorbed in a multi-stage distribution manner. According to the method, separation of all components can be effectively achieved, waste gas treatment is thorough, resource recycling can be completely achieved, the recycling efficiency is high, carbon fibers in the carbon fiber device can be desorbed for regeneration. The service life is long, and chlorobenzene and methylbenzene tail gas are thoroughly absorbed. The method is simple and easy to implement.

Description

technical field [0001] The invention relates to the technical field of tail gas treatment, in particular to a method for treating tail gas from rectification of chlorotoluene. Background technique [0002] In the chlorination industry, especially the chlorination of toluene and chlorotoluene, a large amount of by-product hydrogen chloride (HCl) will be produced, which contains a certain amount of toluene and chlorotoluene, which not only causes serious pollution to the environment, but also seriously affects on-site operations. people and surrounding residents. [0003] At present, due to the complex composition of inorganic organic waste gas and the difficulty in treatment, most enterprises adopt simple water absorption or alkali absorption treatment process, which not only has poor effect, but also produces a large amount of high-salt waste water and waste acid, which are hazardous wastes. Greatly increased the environmental protection pressure and processing costs of ent...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/72B01D53/18B01D53/04
CPCB01D53/04B01D53/1418B01D53/1425B01D53/1456B01D53/1487B01D53/18B01D53/72B01D53/78B01D2252/202B01D2252/2021B01D2252/20484B01D2252/2056B01D2257/2045B01D2257/7027
Inventor 沈德第吴玉明杨俊
Owner NJTECH ENVIRONMENT TECH CO LTD
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