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Method for preparing dichloropropanol by utilizing HCl-containing tail gas

A technology of dichloropropanol and tail gas, which is applied in the field of preparing dichloropropanol, can solve the problems that the output cannot meet domestic needs, and achieve significant economic benefits and reduce energy consumption

Pending Publication Date: 2021-03-12
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, domestic epichlorohydrin consumption has grown rapidly, and the output is far from meeting domestic needs

Method used

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  • Method for preparing dichloropropanol by utilizing HCl-containing tail gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In the preparation tank, 10L (12.9kg, purity 98wt%) glycerin is heated to 60-80° C. and then the catalyst is added. The catalyst is adipic acid, and the addition amount is 632 g. Stir at this temperature to completely dissolve the adipic acid in the glycerin. Introduce the glycerol in which adipic acid is dissolved into the circulation tank, control the temperature of the material in the circulation tank to 125°C, turn on the supergravity reactor motor, control the reactor speed to 400rpm, and turn on the liquid circulation pump to send the material to the supergravity reactor. Begin to pass into pentafluoroethane to produce tail gas (HCl content 90wt%), gas flow 53L / min starts to react, controls HCl in the tail gas: glycerol=3:1 (molar ratio), reaction temperature is controlled at 120 ℃, during the reaction The reaction pressure is 0.15MPa. The liquid phase circulation time is 3h (ie, the reaction time is 3h). After the reaction was finished, the crude product tank w...

Embodiment 2

[0027] In the preparation tank, 10L (12.9kg, purity 98wt%) glycerin is heated to 60-80° C. and then the catalyst is added. The catalyst is acetic acid, and the addition amount is 253 g. Stir at this temperature to completely dissolve the acetic acid in the glycerin. Introduce the acetic acid-dissolved glycerin into the circulation tank, control the temperature of the material in the circulation tank to 70°C, turn on the supergravity reactor motor, control the reactor speed at 650rpm, and turn on the liquid circulation pump to send the material to the supergravity reactor. Begin to pass into difluorochloromethane cracking tail gas (wet process cracking tail gas, HCl content 17wt%, tail gas temperature 230-250 ℃), gas flow rate 105L / min starts to react, controls HCl in the tail gas: glycerol=3:1 ( mol ratio), the reaction temperature is controlled at 130-135° C., and the reaction pressure is 0.15 MPa during the reaction. Liquid phase cycle time 10h. After the reaction was fini...

Embodiment 3

[0029] In the preparation tank, 10L (12.9kg, purity 98wt%) glycerin is heated to 60-80°C and then the catalyst is added, the catalyst is suberic acid, and the addition amount is 127g. Stirring under this temperature condition completely dissolves suberic acid in glycerin. Introduce the glycerol in which suberic acid is dissolved into the circulation tank, control the temperature of the material in the circulation tank to 70°C, turn on the supergravity reactor motor, control the reactor speed at 400rpm, and turn on the liquid circulation pump to send the material to the supergravity reactor. Begin to pass into difluoro-chloroethane cracking to produce vinylidene fluoride tail gas (HCl content 33wt%, tail gas temperature 220-230 ℃), gas flow 72L / min starts to react, controls HCl in the tail gas: glycerin=3:1 (mol ratio), the reaction temperature is controlled at 125° C., and the reaction pressure is 0.2 MPa during the reaction. The liquid phase circulation time is 4.5h. After ...

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Abstract

The invention discloses a method for preparing dichloropropanol by by-product HCl-containing tail gas. The dichloropropanol is produced by reacting the HCl-containing tail gas with glycerol in a supergravity reactor. According to the method, HCl and glycerol in the reaction tail gas quickly and efficiently react to prepare dichloropropanol by utilizing the supergravity reactor, the reaction is enhanced by virtue of a supergravity technology, the defect of slow reaction caused by relatively low HCl concentration is overcome, and meanwhile, the by-product HCl is recycled and converted into dichloropropanol, dichlorohydrin is an intermediate product for producing epoxy chloropropane with a relatively high additional value, and subsequent tail gas separation can reduce the link of separating HCl, so that the energy consumption in the production process is reduced. Therefore, the method for utilizing the by-product HCl is green, efficient and remarkable in economic benefit.

Description

technical field [0001] The invention belongs to the technical fields of environmental protection and petrochemical industry, and in particular relates to a method for preparing dichloropropanol by using tail gas containing HCl. Background technique [0002] In recent years, the treatment of HCl-containing tail gas has become a problem that some chemical companies, especially fluorine chemical companies, have gradually paid attention to. With the improvement of industrial production capacity, a large amount of HCl-containing tail gas can be produced every year. If it is directly absorbed by lye or water, the annual waste hydrochloric acid or waste solid treatment fee will be as high as tens of millions or even hundreds of millions of yuan. If the HCl in it can be reused to synthesize high value-added products, it will not only save the cost of waste hydrochloric acid or waste solid treatment, but also create new profits and turn waste into treasure. Moreover, after the HCl i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/62C07C31/36
CPCC07C29/62
Inventor 周黎旸李宏峰徐晓波
Owner JUHUA GROUP TECH CENT