Method for preparing and purifying CBD monomer from industrial cannabis sativa flowers and leaves

The invention relates to a method for preparing and purifying CBD monomers from industrial cannabis sativa flowers and leaves, which comprises the following steps: decarboxylating cannabis sativa at high temperature, extracting with ethanol to obtain cannabis sativa extract, decoloring and winterizing the cannabis sativa extract, decarboxylating again for further decarboxylation, carrying out molecular distillation to obtain CBD-rich oil, and preparing chromatography to obtain CBD oil. Finally, pure CBD is obtained through a devitrification step. The CBD monomer prepared by the method disclosed by the invention has extremely high yield and purity. 本发明涉及一种从工业大麻花叶中CBD单体的制备和纯化方法，将大麻高温脱羧再用乙醇提取得到大麻浸膏，对大麻浸膏进行脱色和冬化，再一次进行脱羧步骤进一步脱羧，再经过分子蒸馏得到富含CBD的油，通过制备色谱得到CBD油，最后通过析晶步骤得到纯的CBD。按照本发明公开的方法制备得到的CBD单体，具有极高的收率和纯度。