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Decolorization of Acetyl Chloride and Application of Acidic Strong Oxidizer in Acetyl Chloride Decolorization

A strong oxidant and acetyl chloride technology, applied in the field of organic matter decolorization, can solve problems such as unfavorable normal use, affecting appearance, poor effect, etc., and achieve the effect of improving use value, simple implementation, and simple operation

Active Publication Date: 2021-01-05
湖北新蓝天新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The discolored acetyl chloride contains a small amount of impurities, and after the discolored acetyl chloride is repurified and rectified, it will still change color during the later storage and transportation process, which not only affects the appearance, but also the impurities will affect the acetyl chloride. The reaction has an impact, which is not conducive to its normal use as a reaction raw material in various downstream fields. At present, because acetyl chloride itself is relatively active, activated carbon is usually used to decolorize it, and the effect is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Put 200 g of acetyl chloride to be treated at one time into a 500 ml four-neck flask equipped with devices such as a thermometer, mechanical stirring, reflux condenser, and constant pressure dropping funnel. After feeding, the three-necked flask was immersed in cooling water and started stirring. Add 0.2g of concentrated sulfuric acid with a mass fraction not lower than 98% into a constant pressure dropping funnel and drop it into acetyl chloride at a constant speed. The temperature during the dropping process is not higher than 45°C, and the dropping time is 0.5-1h. After the concentrated sulfuric acid was added dropwise, the cooling water was removed and replaced with an electric heating mantle, and the constant pressure dropping funnel was removed and replaced with a sealing plug. Acetyl chloride was slowly warmed up to full reflux, and the reflux reaction time was 1 hour. After the reflux reaction is completed, the reflux device is changed to a rectification device...

Embodiment 2

[0048] The operation steps of the present embodiment are basically the same as those of the embodiment 1, the difference is as follows: the mass fraction of dripping is not less than 0.8 g of 98% concentrated sulfuric acid.

Embodiment 3

[0050] The operating steps of this embodiment are basically the same as those of Embodiment 1, except that the mass fraction of the dropwise added concentrated sulfuric acid is not less than 0.1 g of 98%.

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PUM

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Abstract

The invention discloses a decolorization method of acetyl chloride. The decolorization method comprises the following steps: S1: adding a strong acid oxidant to the discolored acetyl chloride while stirring at the temperature not higher than 45 DEG C; controlling the mass ratio of the strong acid oxidant and acetyl chloride to be (1: 250) to (1:1000); S2: rising the temperature until fractions occur, and performing a total reflux reaction; S3: after the total reflux reaction is finished, distilling to be cutoff at the temperature not higher than 85 DEG C. The invention further discloses application of the strong acid oxidant to decolorization of acetyl chloride. The method disclosed by the invention can remove organic compounds containing unsaturated bonds and more active in properties inacetyl chloride to effectively prevent the discoloration of acetyl chloride in transportation and storage to improve use values of acetyl chloride.

Description

technical field [0001] The invention relates to the field of organic matter decolorization, in particular to an acetyl chloride decolorization method and the application of a strong acidic oxidant in the acetyl chloride decolorization. Background technique [0002] During the industrial use of acetic anhydride and methyltrichlorosilane to synthesize methyltriacetoxysilane, the by-product acetyl chloride will be generated. As a raw material for organic synthesis, acetyl chloride is used in the production of pesticides, medicines, new electroplating complexing agents, catalysts for chlorination of carboxylic acids, acetylation reagents, and other fine organic synthesis intermediates. [0003] Due to the existence of other side reactions in the production process, the trace impurities of acetyl chloride with active organic substances are unstable during storage and transportation, which leads to the darkening of the color of acetyl chloride. [0004] At present, it takes about...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/64C07C53/40
CPCC07C51/64C07C53/40
Inventor 吴崇梁成凯冯琼华
Owner 湖北新蓝天新材料股份有限公司
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