申请人:Tosoh Corporation
公开号:EP3878845A1
公开(公告)日:2021-09-15
Provided is a method of producing perfluoro(2-methylene-4-methyl-1,3-dioxolane), the method including at least following processes (1) to (3):
(1) reacting at least one of perfluoro(2,4-dimethyl-2-fluoroformyl-1,3-dioxolane) and a hydrolysis product thereof with a basic aqueous solution containing one or more cations selected from the group consisting of alkali metal ions and alkaline earth metal ions and then separating a liquid containing produced perfluoro(2,4-dimethyl-1,3-dioxolane-2-yl)carboxylic acid alkali metal salts or perfluoro(2,4-dimethyl-1,3-dioxolane-2-yl)carboxylic acid alkaline earth metal salts by a liquid separation operation;
(2) performing one or more water content reduction treatments selected from the group consisting of water evaporation and water adsorption on the liquid containing the obtained perfluoro(2,4-dimethyl-1,3-dioxolane-2-yl)carboxylic acid alkali metal salts or perfluoro(2,4-dimethyl-1,3-dioxolane-2-yl)carboxylic acid alkaline earth metal salts to obtain perfluoro(2,4-dimethyl-1,3-dioxolane-2-yl)carboxylic acid alkali metal salts or perfluoro(2,4-dimethyl-1,3-dioxolane-2-yl)carboxylic acid alkaline earth metal salts in a solution state or a solid state; and
(3) causing a decarboxylation reaction in a liquid phase system with the obtained perfluoro(2,4-dimethyl-1,3-dioxolane-2-yl)carboxylic acid alkali metal salts or perfluoro(2,4-dimethyl-1,3-dioxolane-2-yl)carboxylic acid alkaline earth metal salts in a solution state or a solid state to produce perfluoro(2-methylene-4-methyl-1,3-dioxolane).
提供了一种生产全氟(2-亚甲基-4-甲基-1,3-二氧戊环)的方法,该方法至少包括以下过程(1)至(3):
(1) 将全氟(2,4-二甲基-2-氟甲酰-1,3-二氧戊环)及其水解产物中的至少一种与含有一种或多种选自碱金属离子和碱土金属离子组成的组中的阳离子的碱性水溶液反应,然后分离出含有生成的全氟(2,4-二甲基-2-氟甲酰-1,3-二氧戊环)的液体、4-二甲基-1,3-二氧戊环-2-基)羧酸碱金属盐或全氟(2,4-二甲基-1,3-二氧戊环-2-基)羧酸碱土金属盐的液体进行液体分离操作;
(2) 对含有所获得的全氟(2,4-二甲基-1,3-二氧戊环-2-基)羧酸碱金属盐或全氟(2,4-二甲基-1、全氟(2,4-二甲基-1,3-二氧戊环-2-基)羧酸碱金属盐或全氟(2,4-二甲基-1,3-二氧戊环-2-基)羧酸碱土金属盐,得到溶液状态或固体状态的全氟(2,4-二甲基-1,3-二氧戊环-2-基)羧酸碱金属盐;和
(3) 在液相体系中,使获得的全氟(2,4-二甲基-1,3-二氧戊环-2-基)羧酸碱金属盐或全氟(2,4-二甲基-1,3-二氧戊环-2-基)羧酸碱土金属盐在溶液态或固态下发生脱羧反应,生成全氟(2-亚甲基-4-甲基-1,3-二氧戊环)。