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[Chemical Knowledge]：TCEP production and manufacturing methods and processes.

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TCEP (Tris (2-carboxyethyl) phosphine) is an important raw material for chemical production, which is widely used in medicine, pesticides, materials and other fields. This article will introduce the manufacturing method of TCEP, including raw material preparation, reaction steps, post-treatment and so on.

1. Raw Material Preparation

The manufacture of TCEP requires the following raw materials:

1. Phosphorus trichloride: As a phosphorus source, it is used to introduce phosphorus atoms.
2. Ethanol: as a carbon source and a hydrogen source, used to introduce an ethyl group and a carboxyl group.

2. Reaction Step
The production of
TCEP is mainly completed through the following steps:

1. Add phosphorus trichloride and ethanol into a reactor at a molar ratio of 1:3, and stir and mix evenly.
2. While stirring, a certain amount of water is slowly added dropwise, and the reaction temperature is controlled between 60 and 80 ° C., so that TCEP and hydrogen chloride gas are formed.
3. During the reaction, the pH value and the temperature of the reaction solution need to be continuously monitored, and the speed of adding water and the reaction time should be adjusted according to the actual situation.
4. After completion of the reaction, the reaction solution was cooled to room temperature, and solid impurities were removed by filtration to obtain a crude product of TCEP.

3. post-treatment

In order to obtain a TCEP product with higher purity, the following post-treatment steps are required:

1. The crude product is washed with distilled water several times to remove residual hydrogen chloride and other impurities.
2. Adjust the pH value to neutral or slightly acidic with lye, and filter again to remove solid impurities.
3. The filtrate is subjected to vacuum distillation to collect the fraction of TCEP to obtain a TCEP product with higher purity.
Precautions for
4.

1. During the manufacturing process, attention should be paid to controlling the reaction temperature and pH value to prevent side reactions and product quality problems.
2. Corrosion-resistant reactors and pipes are required to prevent corrosion of equipment by phosphorus trichloride.
3. Hydrogen chloride gas produced during the manufacturing process is irritating and corrosive and requires proper disposal and discharge.

In short, the manufacture of TCEP requires multiple steps and precautions to obtain a higher purity product. In the actual production process, it is necessary to adjust and optimize according to the specific situation to ensure product quality and production efficiency.

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