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Method for preparing hexafluoroisopropanol by gas phase hydrogenation

A technology for preparing hexafluoroisopropanol and hydrogen, which is applied in chemical instruments and methods, hydroxyl compound preparation, catalyst activation/preparation, etc., can solve the problem of low catalytic efficiency, etc., and achieves low requirements for reaction equipment, high catalytic activity and, Highly selective effect

Active Publication Date: 2022-04-22
TIANJIN CHANGLU CHEM NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, hexafluoroisopropanol is prepared by gas-phase catalytic hydrogenation of hexafluoroacetone. In this field, gas-phase catalytic hydrogenation can be carried out continuously at close to normal pressure - by making the gas-phase raw material of hexafluoroacetone continuous It is carried out in the form of a catalyst, usually Pd / C is used as a catalyst for hydrogenation, but the catalytic efficiency is often not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: The preparation method of catalyst comprises the following steps: firstly, the metal hydrogen storage material LaNi5 is mechanically ground into 200-600 mesh alloy powder, and then the metal boride Co-B is mixed with the metal hydrogen storage material powder by 5:1 After mixing, the sample is placed in a mechanical ball mill, the ball milling time is set to 3-48h, the ball milling speed is 200-600r / min, and the ball-to-material ratio is 6:1; after the ball milling, the metal with catalytic activity is attached to the storage in an amorphous form. The surface of a hydrogen alloy, labeled as catalyst La-Co. Among them, the preparation method of Co-B is: NaBH4 is prepared into a solution of 0.01-10mol / L, and the soluble metal salt CoNO3 is dissolved in deionized water to prepare a solution of 0.05-5mol / L. At room temperature, NaBH4 is slowly dripped under magnetic stirring. into the soluble metal salt solution, the obtained powder is filtered, and vacuum-dri...

Embodiment 2

[0017] Embodiment 2: the preparation method of catalyst comprises the following steps: first metal hydrogen storage material LaNi5 is mechanically ground into 200-600 mesh alloy powder, then metal boride Co-B is mixed with metal hydrogen storage material powder by 5:1 After mixing, the sample is placed in a mechanical ball mill, the ball milling time is set to 3-48h, the ball milling speed is 200-600r / min, and the ball-to-material ratio is 6:1; after the ball milling, the metal with catalytic activity is attached to the storage in an amorphous form. The surface of a hydrogen alloy, labeled as catalyst La-Co. Among them, the preparation method of Co-B is: NaBH4 is prepared into a solution of 0.01-10mol / L, and the soluble metal salt CoNO3 is dissolved in deionized water to prepare a solution of 0.05-5mol / L. At room temperature, NaBH4 is slowly dripped under magnetic stirring. into the soluble metal salt solution, the obtained powder is filtered, and vacuum-dried to obtain an amo...

Embodiment 3

[0019] Embodiment 3: the preparation method of catalyst, comprises the following steps: first mechanically grind metal hydrogen storage material LaNi5 into 200-600 order alloy powder, then metal boride Co-B and metal hydrogen storage material powder are mixed by 5:1 After mixing, the sample is placed in a mechanical ball mill, the ball milling time is set to 3-48h, the ball milling speed is 200-600r / min, and the ball-to-material ratio is 6:1; after the ball milling, the metal with catalytic activity is attached to the storage in an amorphous form. The surface of a hydrogen alloy, labeled as catalyst La-Co. Among them, the preparation method of Co-B is: NaBH4 is prepared into a solution of 0.01-10mol / L, and the soluble metal salt CoNO3 is dissolved in deionized water to prepare a solution of 0.05-5mol / L. At room temperature, NaBH4 is slowly dripped under magnetic stirring. into the soluble metal salt solution, the obtained powder is filtered, and vacuum-dried to obtain an amorp...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/145C07C31/38B01J23/83
CPCC07C29/145B01J23/83B01J37/0036C07C31/38
Inventor 陈爽徐雅硕马雅松张志君
Owner TIANJIN CHANGLU CHEM NEW MATERIAL CO LTD
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