The invention relates to a method of preparing a smoke extract, which method comprises the steps of
i) preparing a tar from wood or cellulose preferably by pyrolysis,
ii) extracting one or more fractions of the tar with an extraction solvent in its supercritical state and/or an extraction solvent in its liquid state, said solvent in its supercritical state being selected from the group consisting of CO2, propane, methane, ethylene, ammoniac, methanol, water and mixtures of one or more of these solvents, said solvent in its liquid state being selected from the group consisting of CO2, propane and mixtures of these components,
iii) collecting at least some of the extracted tar to thereby obtain a smoke extract, wherein the extracted tar is collected from the solvent by removing the solvent from the non-dissolved part of the char, and reducing the pressure in one or more steps, wherein at least some of the extracted char is condensed in each step of pressure reduction.
本发明涉及一种制备烟雾
提取物的方法,该方法包括以下步骤
i) 从木材或
纤维素中制备焦油,最好采用热分解法、
ii) 用超临界状态下的萃取溶剂和/或液态下的萃取溶剂萃取焦油的一个或多个馏分,所述超临界状态下的溶剂选自
二氧化碳、
丙烷、
甲烷、
乙烯、
氨水、
甲醇、
水和一种或多种这些溶剂的混合物组成的组,所述液态下的溶剂选自
二氧化碳、
丙烷和这些成分的混合物组成的组、
iii)收集至少部分提取的焦油,从而获得烟气
提取物,其中提取的焦油是通过从焦
炭的非溶解部分除去溶剂,并在一个或多个步骤中减压而从溶剂中收集的,其中至少部分提取的焦
炭在每个减压步骤中被冷凝。