Continuous purification and acidulation of vegetable oil soapstock

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Abstract
Summary: In summary, the results from full‐scale continuous production indicate that all types of cottonseed soapstocks are sufficiently upgraded by treatment with strong caustic and graining and washing to permit subsequent acidulation. At 175°–195°F., in the presence of a dispersing agent with spent mineral acid at about 4% H2SO4, acidulation of purified soapstock yields a clean, brown, fast‐breaking fatty acid phase with acid value about 188, unsaponifiables about 3%, and an Oxidized Acids content of 3–5%. In laboratory distillations, still residues are usually in the range of 18–23% with a 24‐hr. Gardner color of about 2 on the color cut.

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