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[Chemical Knowledge]：Production and manufacturing method and process of cystine

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The manufacturing method
of cystine
in the field of chemical production raw materials, cystine is an important sulfur-containing amino acid, widely used in medicine, food, cosmetics and other industries. In order to meet the needs of different fields, it is very important to study the manufacturing method of cystine. This article will introduce the manufacturing method of cystine in detail, including its raw materials, process flow, operation points and so on.

1. raw material

1 hair: hair is the main raw material of cystine production, because of the high content of cystine in hair, it has high economic value. Human hair, pig feathers, chicken feathers and the like are usually used as raw materials.
2. Hydrochloric acid: used to adjust the pH value and promote the precipitation of cystine.
3. Sodium hydroxide: Used to neutralize excess hydrochloric acid and adjust the pH of the solution.

2. Process
The manufacturing process of
cystine mainly includes the following steps:

1. Raw material processing: The collected hair is cleaned to remove impurities such as grease and dust.
2. Acidolysis: Add the cleaned hair to hydrochloric acid for acidolysis reaction to decompose the protein in the hair, and dissolve cystine in the acid solution.
3. Neutralization: The acid solution is neutralized with sodium hydroxide to a certain pH value to precipitate cystine.
4. Filtration: The precipitated cystine was separated from the solution by a filtration operation.
5. Washing: Washing cystine with water to remove residual salt and other impurities.
6. Drying: The washed cystine is dried to obtain the finished product.

3. operation points

1. raw material processing: to ensure that the hair clean, to avoid the impact of impurities on the subsequent process.
2. Acidolysis: control the concentration and addition rate of hydrochloric acid, so that the acidolysis reaction is fully carried out.
3. Neutralization: control the speed and amount of sodium hydroxide to make the solution pH moderate and ensure the precipitation of cystine.
4. Filtration: Select the appropriate filtration equipment to ensure the effective separation of cystine and solution.
5. Washing: The washing process needs to be fully stirred to make the impurities on the surface of the cystine fall off.
6. Drying: Use appropriate drying methods to ensure the quality and purity of cystine.

4. common problems and solutions

1. cystine yield is low: possible reasons include poor quality of raw materials, incomplete acidolysis, and excessive. The solution is to improve the quality of raw materials, optimize the acid solution process parameters, control the neutralization process and so on.
2. product color deep: possible reasons include impurities in raw materials, oxidation during drying, etc. The solution is to strengthen the cleaning of raw materials, the use of low-temperature drying methods.
3. Low product purity: possible reasons include incomplete filtration, insufficient washing, etc. The solution is to optimize the filtration equipment, strengthen the washing process and so on.

5. environmental protection and safety measures

1. Wastewater treatment: proper treatment of wastewater generated in the production process to ensure that it is discharged after reaching environmental protection standards.
2. Waste gas treatment: collect and treat the waste gas generated in the production process to reduce air pollution.
3. Operation safety: strengthen staff safety training, ensure compliance with safety regulations during operation, and prevent safety accidents.

summary:

This paper introduces the manufacturing method of cystine in detail, including raw materials, process flow, operation points and so on. In the actual production process, the process parameters should be adjusted and optimized according to the specific situation to improve the yield and purity of cystine. At the same time, environmental protection and safety measures are strengthened to ensure that the production process meets environmental and safety requirements.

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