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The decolorization method of crude stearoyl chloride

A technology of stearyl chloride and acid chloride, which is applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylate, etc., can solve problems such as difficult decolorization by rectification and high tar generation rate, and achieve high production capacity and improved product quality , The effect of reducing the amount of waste

Inactive Publication Date: 2016-03-02
甘肃银光聚银化工有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

Therefore, only rapid gasification at a lower temperature can successfully achieve distillation decolorization. Under conventional rectification conditions, the rate of tar formation is too high, and distillation decolorization is difficult to achieve.

Method used

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  • The decolorization method of crude stearoyl chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1, see figure 1 :

[0024] The crude stearyl chloride generated by the photochemical reaction is continuously pumped into the preheater 1 at a flow rate of 120kg / h, heated to 120°C, and then enters the acid chloride evaporator 2, where the acyl chloride is circulated in the acid chloride evaporator 2, and the material at the bottom of the evaporator is recycled The circulation pump 6 is pumped into the concentrator 8 for tar concentration. The acid chloride evaporator is composed of two-stage falling film evaporators in series, the pressure is controlled at an absolute pressure of 600Pa, the temperature of the first-stage falling-film evaporator is controlled at 185°C, and the temperature of the second-stage falling-film evaporator is controlled at 196°C. The concentrator 8 is a wiped film evaporator, the pressure is controlled at an absolute pressure of 400 Pa, and the temperature is controlled at 210°C. Continuous operation obtained 472kg of stearyl chloride...

Embodiment 2

[0025] Example 2, see figure 1 :

[0026] The crude stearyl chloride generated by the photochemical reaction is continuously pumped into the preheater 1 at a flow rate of 150kg / h, heated to 180°C, and then enters the acid chloride evaporator 2, where the acyl chloride is circulated in the acid chloride evaporator 2, and the material at the bottom of the evaporator is pumped again Enter tar concentrator 8 and carry out tar concentration. The acid chloride evaporator is a first-stage falling film evaporator, the pressure is controlled at an absolute pressure of 1KPa, and the temperature is controlled at 220°C. The tar concentrator is a molecular still, the pressure is controlled at an absolute pressure of 800Pa, and the temperature is controlled at 280°C. Continuously operated for 2 hours to obtain stearyl chloride product (c) 293kg, concentrated tar 7kg. The chromaticity of acid chloride product measured by platinum-cobalt colorimetry is 30HAZEN.

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Abstract

The invention relates to a decolorization method of stearoyl chloride, which is characterized in that the colored thick stearoyl chloride is preheated to 80-200°C in a preheater, and then enters an evaporator, under an absolute pressure of 5Pa to 50KPa, Circulating evaporation between 120 and 250°C, the heavy components at the bottom of the evaporator are pumped into the tar concentrator through a circulating pump for further concentration and evaporation, and the tar with heavy components is discharged from the bottom for treatment, and the gas phase at the top of the evaporator and tar concentrator passes through the condenser And subcooler cooling to obtain colorless pure stearyl chloride product. The invention realizes continuous decolorization of crude stearyl chloride containing heavy components, has high production capacity, and low treatment cost. Compared with the activated carbon adsorption decolorization process, the product of the invention has low chroma, and is suitable for removing high-boiling-point tar in heat-sensitive substances.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a method for decolorizing crude stearyl chloride. Background technique [0002] Industrial stearoyl chloride (Stearoylacidchloride, also known as octadecanoyl chloride) is produced by the reaction of stearic acid with phosgene under the catalysis of dimethylformamide (DMF). During the catalytic photochemical reaction, DMF, stearic acid, and stearyl chloride undergo side reactions to generate complex tar-like colored substances, making the crude stearyl chloride appear light yellow to dark brown, which seriously affects the chroma and color of the stearyl chloride product. Purity has all had greater impact on the range of application of stearyl chloride products and the quality of subsequent derivative products. [0003] At present, the decolorization of crude stearyl chloride generally adopts the activated carbon adsorption process. A certain amount of activated carbon powder is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/42C07C51/64
CPCC07C51/64C07C53/42
Inventor 韩胜兵沈精平蒙鸿飞李小利付振波毛志红张义新
Owner 甘肃银光聚银化工有限公司
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