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[Chemical Knowledge]：Production and manufacturing method and process flow of phosphorous acid

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The manufacturing method
of phosphorous acid
Phosphorous acid is an important chemical raw material, widely used in pesticides, pharmaceuticals, plastics, dyes and other fields. This article will introduce the manufacturing method of phosphorous acid, including raw material preparation, reaction process, post-treatment and so on.

1. Raw Material Preparation

The main raw materials for the manufacture of phosphorous acid are phosphoric acid, sulfuric acid and methanol. The ratio of phosphoric acid to sulfuric acid is 1:1, and the amount of methanol is 30% to 40% of the mass of phosphoric acid. In the process of raw material preparation, it is necessary to ensure the quality and purity of various raw materials to avoid adverse effects on subsequent reactions.

2. reaction process

1. add phosphoric acid and sulfuric acid into the reactor in proportion and stir evenly.
2. While stirring, slowly add methanol at a controlled rate such that the reaction temperature does not exceed 80°C.
3. After the addition is completed, continue to stir for a certain period of time to allow the reaction to proceed fully.
4. After completion of the reaction, the reaction solution was allowed to stand and stratify, and the phosphorous acid and sulfuric acid methanol layers were separated.

3. work-up

1. Distillation of phosphorous acid to collect the product at the specified fraction.
2. The distillation residue is treated to recover methanol and sulfuric acid.
3. Refine the collected phosphorous acid to remove impurities therein.
Precautions for
4.

1. During the manufacturing process, the reaction temperature and pH value should be strictly controlled to ensure the smooth progress of the reaction.
2. The reaction equipment and pipelines need to be regularly maintained and maintained to ensure the normal operation of the equipment and the quality of the product.
3. When dealing with waste liquid and waste gas, environmental protection requirements should be followed to avoid environmental pollution.

In short, the manufacturing method of phosphorous acid involves multiple links, and it is necessary to strictly control the process parameters and operation points of each link to ensure the quality and yield of the product. At the same time, it is also necessary to pay attention to environmental protection and safety production issues to promote the sustainable development of chemical production.

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