Method for preparing dichloropropanol

A technology of dichloropropanol and hydrogen chloride, which is applied in the direction of introducing halogen preparation, hydroxyl compound preparation, chemical instruments and methods, etc., can solve the problems of reducing value, achieve the improvement of raw material utilization rate, specific catalytic performance, and increase reaction speed Effect

Active Publication Date: 2012-09-19
西安汉术化学工程股份有限公司
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Problems solved by technology

However, the supply of glycerol is greater than the dem

Method used

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  • Method for preparing dichloropropanol
  • Method for preparing dichloropropanol

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[0025] As shown in Figure 1, the glycerol with a weight purity of 95.0% (temperature at 50°C) and a flow of 4300kg / h flow through scrubber S20 and heat exchanger E11 to raise the temperature of glycerin to 130°C and enter scrubber S10, where the absorption part After the HCl enters the chlorination reactor (R10), under the action of the catalyst oxalic acid (weight concentration is about 2~3%), the chlorohydrin reaction is carried out with 4000kg / h HCl (pressure ≥0.2MPaG), that is, the above In the first and second steps of the reaction, the weight concentration of dichloropropanol produced is about 12%. The temperature of the chlorination reactor (R10) is maintained at 120~130℃, the pressure is 0.5bar, the diameter is 3.5m, the height is 10m, and the material is fiber reinforced material / perfluoroalkylate.

[0026] The mixture formed by the reaction overflows into the buffer tank V10, and then is sent to the vacuum distillation tower (T20, vacuum, temperature is 140℃, the materi...

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Abstract

The invention provides a method for preparing dichloropropanol, which comprises the following steps: under the action of a catalyst, chlorinating biodiesel byproduct glycerol with chlorine hydride by using a catalytic chlorination technique which comprises continuous feeding, vacuum distillation and continuous production, thereby generating monochloropropanol; and converting the monochloropropanol into dichloropropanol. The dichloropropanol produced by the method is mainly used as a raw material for producing epoxy chloropropane. In the technique for producing dichloropropanol, the utilization ratio of chlorine hydride is very high, and nearly no chlorine hydride is discharged out, thereby greatly reducing the environmental pollution. The invention has the advantages of mild reaction conditions, high catalyst activity, specific catalytic performance, high product selectivity, clean process, easy separation, continuous operation, environment friendliness and the like.

Description

Technical field [0001] The invention relates to a production process of dichloropropanol, in particular to a method for producing dichloropropanol from biodiesel by-product glycerin through continuous catalytic chlorination and continuous rectification. Background technique [0002] At present, epichlorohydrin and its precursor dichloropropanol have two production processes, propylene high-temperature chlorination method and propylene acetate method. Among them, the high-temperature chlorination of propylene is by far the most important production method for epichlorohydrin and its precursor dichloropropanol in the world. Propylene is a petroleum reaction product. The process is to chlorinate propylene with chlorine at a high temperature of 500C. After hydrolysis, a low concentration of dichloropropanol is generated. The propylene acetate method refers to the catalytic oxidation of propylene with acetic acid by palladium to generate propylene acetate, and then catex-catalyzed hy...

Claims

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Application Information

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IPC IPC(8): C07C31/36C07C29/62C07C29/80
Inventor 邓绍贵刘艳何世强董颖涛王志琰马飞狄萌
Owner 西安汉术化学工程股份有限公司
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