Alkaline soap turns into acidic soap
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A batch of alkaline soaps was produced; due to being stored for too long, they have now turned into acidic soaps. What’s going on? I’m a beginner seeking help – thank you very much
Some saponification raw materials contain easily oxidizable groups such as unsaturated groups; the final product of the oxidation of these groups is acid, resulting in an increasing amount of acidic substances.
Soaps with high moisture content and low fat content: I used to think that they changed as a result of coming into contact with carbon dioxide in the air, but this explanation doesn’t seem sufficient
This one. . . Life is really full of surprises
It was probably due to incomplete saponification at that time, as well as an incorrect ratio between the acid value, saponification value, and alkali content!
{:3_50:} It’s mainly the hydrolysis of lipids in your soap that absorbs acidic gases; oxidation occurs very slowly, so it’s unlikely to happen. This is closely related to the degree of hydrolysis of the soap you produce in the initial stages. To determine which factor is at fault, the simplest method is to test the acidity or alkalinity of the material that is in contact with air on the surface, and then take samples from the inside to check its acidity or alkalinity as well.
All data during the production process is under control
Excess alkali leads to the production of alkaline soaps; during the saponification process, soap encapsulates oil, resulting in the alkaline soaps you are referring to. The actual saponification reaction is incomplete; by searching on a search engine, many similar articles will be available that explain this issue. Soap slowly dissolves under alkaline conditions, and the oil or fatty acids contained in the soap are released; no further saponification occurs at room temperature, but there may be an increase in the acid value.
Okay, okay, thank you. I lost interest in this field after graduating, and now I’m picking it up again; there are many things I don’t understand. It’s great that I found this forum – it’s nice to meet you all. Thank you~
At present, the product samples kept in the laboratory are still alkaline, but those in the warehouse have turned into acidic soap. The sample is in a sealed state