Method for preparing beta-ionone through cyclization

The invention discloses a method for preparing beta-ionone through cyclization. The method comprises the following steps: with pseudoionone as a raw material, performing cyclization on the pseudoionone through a catalyst, namely concentrated sulfuric acid, and carrying out hydrolysis quenching so as to prepare the beta-ionone, wherein a reaction system comprises a first solvent and a second solvent; the first solvent is dichloromethane; the second solvent is one or more selected from the group consisting of petroleum ether, solvent gasoline No. 120, n-hexane, cyclohexane and n-heptane; the mass ratio of the first solvent to the second solvent is 1: (1.2-2.5); the ratio of the mass of the pseudoionone to the total mass of the first solvent and the second solvent is 1: (3.2-7.8); and the mass ratio of the pseudoionone to the catalyst, namely the concentrated sulfuric acid is 1: (1.2-2.5). 一种环合制备β-紫罗兰酮的方法，以假性紫罗兰酮为原料，经过催化剂浓硫酸的环合作用，再进行水解淬灭，制备β-紫罗兰酮，所述反应体系包括第一溶剂和第二溶剂，所述第一溶剂为二氯甲烷，第二溶剂选自石油醚、120号溶剂汽油、正己烷、环己烷、正庚烷中的一种或多