Comparison of alternative solvents for oils extraction

TLDR

Hexane dominates oilseed extraction, but rising costs and safety, environmental, and health concerns have spurred interest in alternatives, and solvent choice depends on properties and desired product. The study reviews literature on solvent use for oilseed extraction. Recent research has focused on solvents such as ethanol, isopropanol, methylene chloride, aqueous acetone, and hexane/acetone/water mixtures. The review identifies more than 70 solvents used for oil extraction.

Abstract

Abstract A comprehensive review of the literature about use of solvents for extraction of oilseeds is presented. Mention has been found of over 70 solvents. Currently, hexane is the major solvent in use, but recent price increases and safety, environmental and health concerns, have generated interest in alternatives. Solvents vary considerably in chemical and physical properties which affect their performance in oil extraction. The choice of solvent depends upon the primary end product desired (oil or meal). Recent research on alternative solvents has focused on ethanol, isopropanol, methylene chloride, aqueous acetone, and hexane/acetone/water mixtures.