The synthesis of glycerine from the by-products of the biodiesel production happens through catalyzation with the aid of sulphuric acid and potassium hydroxide. During this process potassium sulphate develops, which can be removed from the process and without any further refinement or purification can be used in agriculture: as straight fertilizer or as component in mixed and complete fertilizers, required by chloride-sensitive plants such as potatoes and certain fruits and vegetables. Potassium sulphate is also used for synthesizing alum and as an important basic material in the glass, colorant and chemical industry.
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