Manufacturing method of cystine
In the field of raw materials for chemical production, cystine is an important sulfur-containing amino acid, which is widely used in pharmaceutical, food and cosmetic industries. In order to meet the needs of different fields, it is crucial to study the manufacturing method of cystine. In this paper, the manufacturing method of cystine will be introduced in detail, including its raw materials, process flow, operation points and other aspects.
I. Raw materials
1. Hair: Hair is the main raw material for the production of cystine, which has high economic value due to its high cystine content. Usually use human hair, pig hair, chicken hair, etc. as raw materials.
2. Hydrochloric acid: used to adjust the pH value and promote the precipitation of cystine.
3. Sodium hydroxide: used to neutralize the excess hydrochloric acid and adjust the solution pH.
II. Process flow
The process flow of manufacturing cystine mainly includes the following steps:
1. Raw material treatment: the collected hair is washed to remove impurities such as grease and dust.
2. Acidolysis: The cleaned hair is added into hydrochloric acid for acidolysis reaction, so that the proteins in the hair are decomposed and cystine is dissolved in the acidolysis solution.
3. Neutralization: The acid solution is neutralized with sodium hydroxide to a certain pH value to precipitate the cystine.
4. Filtration: The precipitated cystine is separated from the solution by a filtration operation.
5. Washing: Cystine is washed with water to remove residual salts and other impurities.
6. Drying: The washed cystine is dried to obtain the finished product.
3. Operation Points
1. Raw material treatment: Ensure the hairs are cleaned to avoid the influence of impurities on the subsequent process.
2. Acidolysis: Control the concentration and addition speed of hydrochloric acid to make the acidolysis reaction proceed adequately.
3. Neutralization: Control the addition rate and amount of sodium hydroxide to make the solution pH value moderate and ensure the precipitation of cystine.
4. Filtration: Choose suitable filtration equipment to ensure effective separation of cystine from the solution.
5. Washing: The washing process needs to be stirred sufficiently, so that the impurities on the surface of cystine are dislodged.
6. Drying: Adopt suitable drying method to ensure the quality and purity of cystine.
Four, common problems and solutions
1. Low yield of cystine: Possible reasons include poor quality of raw materials, incomplete acid digestion, excessive neutralization, etc. The solution is to improve the quality of raw materials, optimize the quality of the acid solution, and optimize the quality of cystine. The solution is to improve the quality of raw materials, optimize the acid digestion process parameters, and control the neutralization process. Dark color of product: Possible reasons include impurities in raw materials, oxidation during drying process, etc. The solution is to strengthen the cleaning of raw materials, use of drying process, and so on. The solution is to strengthen the cleaning of raw materials, 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 drying process, and adopt low temperature drying method. The solution is to optimize the filtration equipment and strengthen the washing process.
V. Environmental protection and safety measures
1. Wastewater treatment: Properly treat the wastewater generated in the production process to ensure that it meets the environmental standards and then discharged.
2. Waste gas treatment: collect and treat the waste gas generated in the production process to reduce air pollution.
3. Operation safety: Strengthen the safety training of employees to ensure that the operation process to comply with the safety norms, to prevent the occurrence of safety accidents.
Summary:
This article describes in detail the manufacturing method of cystine, including raw materials, process flow, operation points and other aspects. In the actual production process, the process parameters need to be adjusted and optimized according to the specific conditions in order 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 protection and safety requirements.
