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Decoloring method of crude stearyl chloride

A technology of stearoyl chloride and acid chloride, applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylate, etc., can solve the problems of difficult to achieve rectification decolorization and high tar generation rate, and achieve high productivity and improved product quality , the effect of low processing costs

Inactive Publication Date: 2015-05-06
甘肃银光聚银化工有限公司
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  • Application Information

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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  • Decoloring method of crude stearyl 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 800 Pa, 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 30 HAZEN.

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Abstract

The invention relates to a decoloring method of crude stearyl chloride which is characterized by comprising the following steps: pre-heating colored crude stearyl chloride to 80-200 DEG C in a pre-heater, sending the pre-heated colored crude stearyl chloride into an evaporator and circularly evaporating at 120-250 DEG C under an absolute pressure of 5Pa-50Kpa, pumping heavy components at the bottom of the evaporator into a tar concentrating devise by using a recycle pump to perform further concentration and evaporation, discharging the colored heavy component tar from the bottom for processing, cooling down gas phase at the top of the evaporator and the tar concentrating devise by using a condenser and a subcooler to obtain colorless pure stearyl chloride products. According to the invention, continuous decoloring of crude stearyl chloride containing heavy components is realized with high yield and low cost of process. Compared with activated carbon adsorption decoloring technology, the invention is applicable to removal of high boiling tar from heat sensitive materials due to low saturation of the product.

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 acid chloride (Stearoyl acid chloride, 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 po...

Claims

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Application Information

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Patent Type & Authority Applications(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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