Production process for extracting cottonseed oil and gossypol from cottonseed embryo piece

The invention discloses a production process for extracting cottonseed oil and gossypol from cottonseed embryo pieces. The production process comprises the following steps: (1) leaching cottonseed embryo pieces in a acetone n-hexane mixed solvent at 50-60 DEG C for 60-110 minutes, filtering so as to obtain a filter residue I and an extract containing gossypol, feeding the filter residue I to the step (2), and recycling the solvent from the extract containing gossypol so as to obtain a gossypol crude product I; (2) leaching the filter residue I with methanol so as to obtain a filter residue II and a methanol leachate, feeding the methanol leachate to the step (3), leaching the filter residue II with a mixed solution of liquefied propane and liquefied butane at 50-55 DEG C for 70-90 minutes, and filtering so as to obtain cottonseed oil; (3) adding phenylamine for complexing into the methanol leachate, performing solid-liquid separation so as to obtain diphenylamine gossypol, recycling the solvent, and decomplex