Method for preparing hexafluoroisopropanol by gas phase hydrogenation

Abstract

The invention belongs to the field of fluorine chemical industry, and specifically relates to a method for preparing hexafluoroisopropanol by gas-phase hydrogenation, comprising the following steps: loading a catalyst in a hydrogenation chamber, gasifying hexafluoroacetone hydrate at 110°C, and gasifying the Hexafluoroacetone hydrate and hydrogen-nitrogen mixture are passed into the hydrogenation chamber filled with catalyst, the reduction temperature of the hydrogen chamber is 150-350°C, the reduction time is 1-3 hours, and the molar ratio of hydrogen to hexafluoroacetone is 3- 20:1; after the reaction, enter the product processing unit for product separation. The method for preparing hexafluoroisopropanol by gas-phase hydrogenation of the present invention can be reacted under mild conditions, and has low requirements on reaction equipment; the catalyst of the present invention has high catalytic activity and high selectivity, and almost no by-products are generated; the catalyst of the present invention is simple to prepare , easy molding and large-scale production.

Description

technical field

[0001] The invention belongs to the field of fluorine chemical industry, and in particular relates to a method for preparing hexafluoroisopropanol by gas-phase hydrogenation. Background technique

[0002] Hexafluoroisopropanol (HFIP) is an important chemical raw material and an important intermediate for the synthesis of certain chemical products, and is widely used in the plastics industry, medicine, and pesticides. Hexafluoroisopropanol is an excellent solvent that can dissolve many insoluble polymers at room temperature, including nylon-66, nylon-6, polyamide, polyester, polyacrylonitrile, polyacetal and hydrolyzed polyethylene grease, etc. This important property of hexafluoroisopropanol can be used in the recycling of plastics; and the chromatographic analysis of polymers can form a useful polymer coating on the surface of many objects. Hexafluoroisopropanol also has excellent surface tension, which can well disperse and dissolve certain dyes and organ...