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A kind of waste material filtering method of stearoyl chloride

A technology of stearoyl chloride and filtration method, which is applied in the direction of chemical instruments and methods, preparation of organic compounds, preparation of carboxylate, etc., can solve problems such as high labor intensity, large amount of activated carbon powder, and difficult solid waste treatment, and achieve The effect of reducing reaction time, reducing waste, and reducing time for rectification and waste gas treatment

Active Publication Date: 2017-06-16
ANHUI GUANGXIN AGROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acid chloride obtained by this method has high chroma, poor product quality, high labor intensity and poor operating environment
The amount of activated carbon powder added during the treatment process is large, the production cost is high, and solid waste treatment is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First, the temperature of the crude stearoyl chloride is heated to 75°C, and a filter is used to filter once, and at the same time, the pressure of the crude stearoyl chloride is increased to 0.5KPa, which can avoid further polymerization of the crude stearoyl chloride at high temperature to generate more By-products, such as tar substances, and the state of tar substances at this temperature is a solid-liquid mixture, so a filtration can be performed, that is, a preliminary filtration can reduce the production of tar substances;

[0025] Secondly, heat the above-mentioned filtered material to 86°C, stir for 20 minutes, then cool down to 30°C, and continue to precipitate for 2 days. The mixture can be heated and precipitated to avoid coagulation of tar substances and stearoyl chloride. Therefore, it is necessary to Heating, and will carry out precipitation, can carry out secondary filtration separation of tar-like substance, can make stearoyl chloride and tar-like substa...

Embodiment 2

[0031] First, the temperature of the crude stearoyl chloride is heated to 78°C, and a filter is used to filter once, and at the same time, the pressure of the crude stearoyl chloride is increased to 0.40KPa, which can avoid the further polymerization reaction of the crude stearoyl chloride at high temperature to generate more By-products, such as tar substances, and the state of tar substances at this temperature is a solid-liquid mixture, so a filtration can be performed, that is, a preliminary filtration can reduce the production of tar substances;

[0032] Secondly, heat the above-mentioned filtered material to 88°C, stir for 18 minutes, cool down to 40°C, and continue to precipitate for 1.5 days. The mixture can be heated and precipitated to avoid coagulation of tar substances and stearoyl chloride. Therefore, it is necessary to Heating, and will carry out precipitation, can carry out secondary filtration separation of tar-like substance, can make stearoyl chloride and tar-...

Embodiment 3

[0038] First, the temperature of the crude stearoyl chloride is heated to 80°C, and a filter is used to filter once, and at the same time, the pressure of the crude stearoyl chloride is increased to 0.35KPa, which can avoid further polymerization of the crude stearoyl chloride at high temperature to generate more By-products, such as tar substances, and the state of tar substances at this temperature is a solid-liquid mixture, so a filtration can be performed, that is, a preliminary filtration can reduce the production of tar substances;

[0039] Secondly, heat the above-mentioned filtered material to 92°C, stir for 15 minutes, then cool down to 50°C, and continue to precipitate for 1 day. The mixture can be heated and precipitated to avoid coagulation of tar substances and stearyl chloride. Therefore, it is necessary to Heating, and will carry out precipitation, can carry out secondary filtration separation of tar substance, can make stearoyl chloride and tar substance separat...

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Abstract

The invention provides a stearoyl chloride waste filtering method. The method comprises the steps of heating coarse stearoyl chloride, and conducting primary filtration with a filter; heating materials generated after primary filtration; inputting mixed materials obtained after precipitation into a separating tank for secondary filtering separation; introducing mixed materials obtained after secondary filtration into a concentrator for concentration, and then transferring the materials into a filtering tank for standing so that ternary filtration can be conducted; finally, conducting standing and layering on the materials obtained after the three times of filtration. By the adoption of the production technology, tar substances in coarse stearoyl chloride can be completely filtered out and separated, and the situation that side reaction is caused during re-separation of coarse stearoyl chloride to affect the purity of stearoyl chloride is avoided by means of certain temperature, certain time and certain pressure, so that raw material waste is avoided and production cost is reduced; meanwhile, tar substances can be separated out by over 97.9%.

Description

technical field [0001] The invention relates to the field of plastic fine chemical production, in particular to a waste material filtering method of stearoyl chloride. Background technique [0002] Stearoyl acid chloride (Stearoyl acid chloride, also known as octadecanoyl chloride) is a pesticide intermediate and also a raw material for the production of neutral sizing agent for papermaking——alkyl ketone dimer (AKD). Under the catalysis of the catalyst dimethylformamide (DMF), it reacts with phosgene to form an acylated product. The reaction is mainly divided into two stages: [0003] 1. Catalyst activation stage [0004] Phosgene reacts with dimethylformamide to generate active group (1), which is very unstable and releases a molecule of CO very quickly. 2 , and generate an active group (2); [0005] 2. The active group (2) reacts with stearic acid to generate stearyl chloride, regenerates dimethylformamide, and releases a molecule of HCl at the same time; [0006] At ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/64C07C53/42
CPCC07C51/64C07C53/42
Inventor 过学军胡安胜吴建平高焰兵戴玉婷张军刘长庆徐小兵黄显超朱张
Owner ANHUI GUANGXIN AGROCHEM
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