Process for extracting plant-protecting agents and/or for reducing contaminants from cereals

摘要

A method for the extraction of pesticides and/or the reduction of unwanted byproducts, oils and waxes from grain, e.g. rice The method comprises: (1) adjusting the moisture content in the grain to 5-30% by drying or wetting the grain; (2) extracting substances by treating the grain with liquid, in the presence of CO2 at 40-360 bar and 5-60 degrees C and in the presence of solvents; and (3) removing the extract from the CO2 using a wash column or solid adsorption substance, or a two-phase pressure-reducing process using a pre-secretion unit and a wash column.