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Tail gas treatment method

A tail gas treatment and tail gas technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of poor separation effect, difficult post-treatment, equipment corrosion, etc., and achieve low cost, high reproducibility, high treatment simple craftsmanship

Active Publication Date: 2021-11-12
ANHUI JINGHE IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the current treatment status of tail gas produced by chlorination of sucrose with Vilsmeier chlorinated reagent to produce sucralose-6-ester, there are problems of poor separation effect, difficult post-treatment, easy to cause serious equipment corrosion, and solid deposits formed by compressed gas lead to pipeline blockage and other problems, a tail gas treatment method is proposed, which can overcome the above problems or at least partially solve the above problems

Method used

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Effect test

Embodiment 1

[0094] R-1 chloride tail gas cooling and condensing the cooling tower, the condensate to 0 deg.] C, after condensation, the cooling tower bottom solution R-1 is sent to solvent recovery, cooling tower overhead exhaust R-1, i.e., the exhaust gas enters the first dehydration R-2 column desolvation process continues. First off-gas entering the pre-dehydration hydrophilic ionic liquid solvent removal column R-2, the adsorption temperature is 40 ℃, wherein the hydrophilic ionic liquid as pyridine bisulfate 50wt% and 50wt% methyl imidazole bisulfate mixture. Desolvation dehydration column top product R-2 via the second exhaust gas canister T-1 adsorb residual organic gas, then through a filter E-3, the compressor T-2, E-4 after the filter process proceeds plus pressure rectification column R-4, the pressing pressure of the rectification column 2MPa, column bottom temperature of 0 ℃, column top temperature of 10 ℃, to obtain high purity liquid SO pressure rectification column from the bo...

Embodiment 2

[0097] The chlorinated tail gas is cooled and condensed by cooling tower R-1, condensed to 30 ° C, condensing, cooling tower R-1 tower bottom aqueous solution, cooling tower R-1 tail gas, i.e., first exhaust gas into dehydration The degradation tower R-2 continues to be treated. The first exhaust gas enters the preset dehydrated dehydrocolysis pirate R-2, the adsorption temperature is 30 ° C, wherein the hydrophilic ionic liquid is 40 wt% pyridine sulfate and 60 wt% ethylimidazole sulfate. mixture. The hydrophilic ionic liquid after the dehydrated degrading tower R-2 is used to enter the ionic liquid regeneration kettle V-1 for regeneration treatment, and the regeneration temperature is 100 ° C, the vacuum degree -0.07 MPa, and the hydrophilic ion liquid after regeneration is regenerated. The bottom of the kettle V-1 is produced, and after cooling by the condenser E-1 to 30 ° C, and after filtration of the filter E-1, the dehydrated dehydrating tether R-2 continues to use. The sec...

Embodiment 3

[0100] The tail gas is cooled by the cooling tower R-1, condensed to 10 ° C, condensate, the cooling tower R-1 bottom aqueous solution is sent to the solvent recovery, the tower of the tower of the tower R-1, that is, the first exhaust gas into the dehydration The degradation tower R-2 continues to be treated. The first exhaust gas enters the preset dehydrated dehydricate R-2, the adsorption temperature is 40 ° C, wherein the hydrophilic ionic liquid is 20 wt% pyridine sulfate, 30 wt% methylimidazole sulfate and hydrogenate. Mixtures of 50 wt% ethylimidazole sulphate sulphate. The hydrophilic ionic liquid after the dehydrated release tower R-2 is used to enter the ionic liquid regeneration kettle V-1 for regeneration treatment, the regeneration temperature is 120 ° C, the vacuum-0.05 MPa, the hydrophilic ion liquid after regeneration is regenerated The bottom of the kettle V-1 is produced, and after cooling from the condenser E-1 to 20 ° C, and after filtration of the filter E-1, ...

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Abstract

The invention provides a tail gas treatment method, tail gas is generated in the process of generating sucralose-6-ester through chlorination reaction of sucralose-6-ester, the method comprises the following steps: cooling and condensing the tail gas to remove part of an organic solvent and water to obtain a first solution and first tail gas; adsorbing and separating the first tail gas by adopting hydrophilic ionic liquid to remove most of water and organic solvent in the first tail gas, so as to obtain second tail gas; adsorbing and filtering the second tail gas by adopting a solid adsorbent to obtain a gaseous mixture, and separating the gaseous mixture to obtain gaseous hydrogen chloride and liquid sulfur dioxide; and introducing the gaseous hydrogen chloride into water to obtain hydrochloric acid. According to the method, ionic liquid adsorption is mainly used and is organically combined with means such as condensation and rectification, chlorination tail gas in the sucralose production process can be effectively treated, effective separation of HCl and SO2 is achieved, high-quality hydrochloric acid and liquid SO2 products are obtained, the process is simple, and the cost is low.

Description

Technical field [0001] The invention belongs to the technical field of chemical exhaust gas separation and recovery industry, and specifically relates to an exhaust gas treatment method. Background technique [0002] Sucralose-6-ester is one of the important intermediates in the preparation of sucralose. Sucralose-6-ester can be obtained by esterification of sucrose and then chlorination with chlorination reagents. At present, the main industrial chlorination reagents are Vilsmeier chlorinated reagents and phosgene products are used by fewer companies due to the high risk and high pollution of phosgene. The Vilsmeier chlorination reagent is mainly prepared from DMF and dimethyl sulfoxide, and is relatively safe to use. However, during the chlorination process, a large amount of tail gas will be produced, including HCl, SO 2 , water, DMF and trichloroethane, etc. [0003] Traditional treatment of the above-mentioned tail gas usually uses cooling condensation, sulfuric acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/00B01D53/02B01D53/18
CPCB01D53/002B01D53/18B01D53/1425B01D53/02B01D53/1456B01D53/1418
Inventor 杨志健陈永乐陈宇涵刘建
Owner ANHUI JINGHE IND
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