申请人:TOSOH CORPORATION
公开号:US20220002262A1
公开(公告)日:2022-01-06
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).
提供了一种制备全氟(2-亚甲基-4-甲基-1,3-二氧杂环己烷)的方法,该方法包括至少以下步骤(1)至(3):(1)将至少一种全氟(2,4-二甲基-2-氟甲酰基-1,3-二氧杂环己烷)及其水解产物与含有选自碱金属离子和碱土金属离子的阳离子的碱性水溶液反应,然后通过液体分离操作分离出含有产生的全氟(2,4-二甲基-1,3-二氧杂环己烷-2-基)羧酸碱金属盐或全氟(2,4-二甲基-1,3-二氧杂环己烷-2-基)羧酸碱土金属盐的液体;(2)对所得到的含有全氟(2,4-二甲基-1,3-二氧杂环己烷-2-基)羧酸碱金属盐或全氟(2,4-二甲基-1,3-二氧杂环己烷-2-基)羧酸碱土金属盐的液体进行选自水蒸发和水吸附的一种或多种水分减少处理,以获得溶液状态或固态的全氟(2,4-二甲基-1,3-二氧杂环己烷-2-基)羧酸碱金属盐或全氟(2,4-二甲基-1,3-二氧杂环己烷-2-基)羧酸碱土金属盐;以及(3)在溶液状态或固态的全氟(2,4-二甲基-1,3-二氧杂环己烷-2-基)羧酸碱金属盐或全氟(2,4-二甲基-1,3-二氧杂环己烷-2-基)羧酸碱土金属盐的存在下,在液相体系中进行脱羧反应,以产生全氟(2-亚甲基-4-甲基-1,3-二氧杂环己烷)。