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Method for synthesizing dichloropropanol by reaction of glycerol and hydrogen chloride

A technology of dichloropropanol and hydrogen chloride, which is applied in the fields of chemical industry and chemistry, can solve the problems of continuous unfavorable reactions, long reaction time, and reduction of catalyst content, and achieve the effects of shortening reaction time, improving selectivity, and avoiding consumption loss

Inactive Publication Date: 2011-11-09
JIANGSU LEE & MAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The conversion of glycerol can be improved by timely distillation to remove the water generated in the reaction, but the reaction time is longer
In addition, due to the low boiling point of acetic acid, it is easy to be distilled off together with water at the reaction temperature, resulting in a gradual decrease in the catalyst content, which is not conducive to the continuous reaction. Many researchers have improved the design of the reaction device.

Method used

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  • Method for synthesizing dichloropropanol by reaction of glycerol and hydrogen chloride
  • Method for synthesizing dichloropropanol by reaction of glycerol and hydrogen chloride
  • Method for synthesizing dichloropropanol by reaction of glycerol and hydrogen chloride

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Add 19.07g (207mmol) of glycerol and 1.184g (16mmol) of propionic acid to the reactor, heat it to 105°C, and feed 3.31mol of gaseous hydrogen chloride at a flow rate of 331mmol / h, the reaction time is 10 hours, sampling analysis, gas spectrogram results It shows that the conversion rate of glycerol is 99.3%, and the yield of dichloropropanol is 81.4%.

Embodiment 2

[0025] Add 19.07g (207mmol) of glycerin and 2.176g (16mmol) of zinc chloride to the reactor, heat it to 105°C, and feed 3.31mol of gaseous hydrogen chloride at a flow rate of 331mmol / h. The reaction time is 10 hours. Sampling test, gas spectrogram results It shows that the conversion rate of glycerol is 90.1%, and the yield of dichloropropanol is 77.8%.

Embodiment 3

[0027] Add 19.07g (207mmol) of glycerol and 1.49g (16mmol) of chloroacetic acid into the reactor, heat it to 105°C, and feed 3.31mol of gaseous hydrogen chloride at a flow rate of 331mmol / h. The reaction time is 10 hours. Sampling test is performed, and the gas spectrogram results show The conversion rate of glycerol was 70.2%, and the yield of dichloropropanol was 78.3%.

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Abstract

The invention discloses a method for synthesizing dichloropropanol by reaction of glycerol and hydrogen chloride. In the method, glycerol reacts with anhydrous hydrogen chloride gas in the presence of a catalyst at 100-120 DEG C and atmospheric pressure for 5-15 hours to synthesize dichloropropanol, wherein the catalyst is one of propionic acid, zinc chloride, chloroacetic acid, zinc propionate and zinc adipate. By the method disclosed by the invention, the glycerol is almost fully converted, and the dichloropropanol yield is higher than 90%; and the method has the advantages of low investment, low energy consumption and little waste emission, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the fields of chemistry and chemical industry, and relates to a method for synthesizing dichloropropanol with glycerin and hydrogen chloride gas under the action of a catalyst. Background technique [0002] China is currently the largest production base of epoxy resin in the world, and there is a great demand for epichlorohydrin products. The traditional production routes of epichlorohydrin are propylene high-temperature chlorination method and propylene acetate method. Both processes use propylene and chlorine gas as raw materials, which have the disadvantages of toxic and harmful raw materials, low conversion rate, many chlorine-containing by-products, serious equipment corrosion, and many "three wastes". [0003] In recent years, with the trend of depletion of oil resources, the biodiesel industry as an alternative energy source has developed rapidly, and a large amount of glycerol (accounting for about 10% of biodiesel pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/36C07C29/62
Inventor 陈新滋黎星术贾振华贾青
Owner JIANGSU LEE & MAN CHEM
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