CN111205166B - Method for preparing hexafluoroisopropanol by gas-phase hydrogenation - Google Patents
Method for preparing hexafluoroisopropanol by gas-phase hydrogenation Download PDFInfo
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- CN111205166B CN111205166B CN201911399561.2A CN201911399561A CN111205166B CN 111205166 B CN111205166 B CN 111205166B CN 201911399561 A CN201911399561 A CN 201911399561A CN 111205166 B CN111205166 B CN 111205166B
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- C07—ORGANIC CHEMISTRY
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- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/132—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen containing functional group
- C07C29/136—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen containing functional group of >C=O containing groups, e.g. —COOH
- C07C29/143—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen containing functional group of >C=O containing groups, e.g. —COOH of ketones
- C07C29/145—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen containing functional group of >C=O containing groups, e.g. —COOH of ketones with hydrogen or hydrogen-containing gases
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- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/83—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with rare earths or actinides
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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0027—Powdering
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Abstract
The invention belongs to the field of fluorine chemical industry, and particularly relates to a method for preparing hexafluoroisopropanol by gas-phase hydrogenation, which comprises the following steps: filling a catalyst into a hydrogenation chamber, gasifying hexafluoroacetone hydrate at 110 ℃, introducing the gasified hexafluoroacetone hydrate and mixed gas of hydrogen and nitrogen into the hydrogenation chamber filled with the catalyst, wherein the reduction temperature of the hydrogen chamber is 150-350 ℃, the reduction time is 1-3 hours, and the molar ratio of hydrogen to hexafluoroacetone is 3-20: 1; and after the reaction is finished, the reaction product enters a product treatment unit for product separation. The method for preparing hexafluoroisopropanol by gas-phase hydrogenation can be used for reaction under mild conditions, and has low requirements on reaction equipment; the catalyst has high catalytic activity and high selectivity, and almost no by-product is generated; the catalyst of the invention has simple preparation, easy molding and large-scale production.
Description
Technical Field
The invention belongs to the field of fluorine chemical industry, and particularly relates to a method for preparing hexafluoroisopropanol by gas-phase hydrogenation.
Background
Hexafluoroisopropanol (HFIP) is an important chemical raw material and an important intermediate for synthesizing certain chemical products, and is widely applied to plastic industry, medicines and pesticides. Hexafluoroisopropanol is an excellent solvent capable of dissolving many poorly soluble high molecular polymers at room temperature, including nylon-66, nylon-6, polyamides, polyesters, polyacrylonitriles, polyacetals, hydrolyzed polyvinyl esters, and the like. This important property of hexafluoroisopropanol can be used in the recycling of plastics; and the chromatographic analysis of the high polymer, a useful high polymer coating can be formed on the surface of a plurality of objects. Hexafluoroisopropanol also has excellent surface tension, can well disperse and dissolve certain dyes and organic pigments, can make the dyes and organic pigments easily enter some porous structure materials, such as metal, ceramics, concrete and textile fibers, and makes the materials easily colored. Hexafluoroisopropanol is an important intermediate for preparing the anesthetic, the clinical use dosage of the anesthetic prepared by the hexafluoroisopropanol is small, the hexafluoroisopropanol is easy to be absorbed by a human body, the anesthetic efficiency is high, and the influence on the human body is small.
The excellent performance and wide market application prospect of hexafluoroisopropanol arouse the interest of domestic and foreign fluorine-containing product production companies, and research is carried out from the sixties of the last century abroad, and industrial production is formed. Currently, hexafluoroisopropanol is prepared by a method of vapor phase catalytic hydrogenation of hexafluoroacetone, in which field, the vapor phase catalytic hydrogenation can be continuously carried out under the condition of approaching normal pressure-by continuously passing the vapor phase raw material of hexafluoroacetone through a catalyst, generally Pd/C is adopted as the catalyst for hydrogenation, but the catalytic efficiency is not high.
Disclosure of Invention
The invention aims to provide a method for preparing hexafluoroisopropanol by gas-phase hydrogenation.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preparing hexafluoroisopropanol by gas-phase hydrogenation comprises the following steps: filling a catalyst into a hydrogenation chamber, gasifying hexafluoroacetone hydrate at 110 ℃, introducing the gasified hexafluoroacetone hydrate and mixed gas of hydrogen and nitrogen into the hydrogenation chamber filled with the catalyst, wherein the reduction temperature of the hydrogen chamber is 150-350 ℃, the reduction time is 1-3 hours, and the molar ratio of hydrogen to hexafluoroacetone is 3-20: 1; and after the reaction is finished, the reaction product enters a product treatment unit for product separation.
Preferably, the method for preparing hexafluoroisopropanol by gas-phase hydrogenation comprises the following steps: filling a catalyst into a hydrogenation chamber, gasifying hexafluoroacetone hydrate at 110 ℃, introducing the gasified hexafluoroacetone hydrate and mixed gas of hydrogen and nitrogen into the hydrogenation chamber filled with the catalyst, wherein the reduction temperature of the hydrogen chamber is 200 ℃, the reduction time is 1-3 hours, and the molar ratio of hydrogen to hexafluoroacetone is 5: 1; and after the reaction is finished, the reaction product enters a product treatment unit for product separation.
The product treatment unit comprises a product 65-degree condensation device for recovering raw materials, a 30-degree condensation device for obtaining a product hexafluoroisopropanol and a 0-degree cold trap for recovering low-boiling-point byproducts, which are connected in sequence.
The catalyst comprises the following components in parts by mass: 5-10 parts of metal hydrogen storage material; 1 part of metal boride.
The metal hydrogen storage material is LaNi5, ZrMn2, Mg2Ni and V0.8Ti0.2；La0.67Mg0.33Ni3.0A(ii) a One of the metal boride Co-B, Ni-B, Pd-B alloys.
The preparation method of the catalyst comprises the following steps: firstly, mechanically grinding a metal hydrogen storage material into 200-mesh 600-mesh alloy powder, then mixing metal boride and metal hydrogen storage material powder, putting a mixed sample into a mechanical ball mill, and setting the ball milling time to be 3-48h, the ball milling rotation speed to be 200-mesh 600r/min and the ball-to-material ratio to be 12:1-2: 1; after the ball milling is finished, the metal with catalytic activity is obtained and is attached to the surface of the hydrogen storage alloy in an amorphous state.
Compared with the prior art, the invention has the beneficial effects that:
the catalysts of the present application react reversibly with gaseous H2 to form metal solid solutions and metal hydrides. Hydrogen molecules contact the surface of the alloy, are firstly adsorbed on the surface of the alloy molecules, then H-H bonds are dissociated to form atomic hydrogen, and the atomic hydrogen is reduced into hexafluoroisopropanol by the reduction of hexafluoroacetone under the action of a hydrogenation catalyst. The method for preparing hexafluoroisopropanol by gas-phase hydrogenation can be used for reaction under mild conditions, and has low requirements on reaction equipment; the catalyst has high catalytic activity and high selectivity, and almost no by-product is generated; the catalyst of the invention has simple preparation, easy molding and large-scale production.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the following preferred embodiments.
Example 1: the preparation method of the catalyst comprises the following steps: firstly, mechanically grinding a metal hydrogen storage material LaNi5 into alloy powder of 200-mesh and 600-mesh, then mixing metal boride Co-B and metal hydrogen storage material powder according to a ratio of 5:1, putting a mixed sample into a mechanical ball mill, and setting ball milling time to be 3-48h, ball milling rotation speed to be 200-mesh and 600r/min and ball material ratio to be 6: 1; after the ball milling is finished, the obtained metal with catalytic activity is attached to the surface of the hydrogen storage alloy in an amorphous state and is marked as a catalyst La-Co. The preparation method of the Co-B comprises the following steps: NaBH4 is prepared into a 0.01-10mol/L solution, soluble metal salt CoNO3 is dissolved in deionized water to prepare a 0.05-5mol/L solution, NaBH4 is slowly dripped into the soluble metal salt solution under magnetic stirring at room temperature, and the obtained powder is filtered and vacuum-dried to obtain the amorphous metal boride alloy.
The obtained catalyst is applied to the preparation of hexafluoroisopropanol by the gas-phase catalytic hydrogenation of hexafluoroacetone. The method specifically comprises the following steps: filling a catalyst into a hydrogenation chamber, gasifying hexafluoroacetone hydrate at 110 ℃, introducing the gasified hexafluoroacetone hydrate and mixed gas of hydrogen and nitrogen into the hydrogenation chamber filled with the catalyst, wherein the reduction temperature of the hydrogen chamber is 200 ℃, the reduction time is 1-3 hours, and the molar ratio of hydrogen to hexafluoroacetone is 10: 1; and after the reaction is finished, the reaction product enters a product treatment unit for product separation.
Example 2 method for preparing a catalyst comprising the steps of: firstly, mechanically grinding a metal hydrogen storage material LaNi5 into alloy powder of 200-mesh and 600-mesh, then mixing metal boride Co-B and metal hydrogen storage material powder according to a ratio of 5:1, putting a mixed sample into a mechanical ball mill, and setting ball milling time to be 3-48h, ball milling rotation speed to be 200-mesh and 600r/min and ball material ratio to be 6: 1; after the ball milling is finished, the obtained metal with catalytic activity is attached to the surface of the hydrogen storage alloy in an amorphous state and is marked as a catalyst La-Co. The preparation method of the Co-B comprises the following steps: NaBH4 is prepared into a 0.01-10mol/L solution, soluble metal salt CoNO3 is dissolved in deionized water to prepare a 0.05-5mol/L solution, NaBH4 is slowly dripped into the soluble metal salt solution under magnetic stirring at room temperature, and the obtained powder is filtered and vacuum-dried to obtain the amorphous metal boride alloy.
The obtained catalyst is applied to the preparation of hexafluoroisopropanol by the gas-phase catalytic hydrogenation of hexafluoroacetone. The method specifically comprises the following steps: filling a catalyst into a hydrogenation chamber, gasifying hexafluoroacetone hydrate at 110 ℃, introducing the gasified hexafluoroacetone hydrate and mixed gas of hydrogen and nitrogen into the hydrogenation chamber filled with the catalyst, wherein the reduction temperature of the hydrogen chamber is 200 ℃, the reduction time is 1-3 hours, and the molar ratio of hydrogen to hexafluoroacetone is 3: 1; and after the reaction is finished, the reaction product enters a product treatment unit for product separation.
Example 3: the preparation method of the catalyst comprises the following steps: firstly, mechanically grinding a metal hydrogen storage material LaNi5 into alloy powder of 200-mesh and 600-mesh, then mixing metal boride Co-B and metal hydrogen storage material powder according to a ratio of 5:1, putting a mixed sample into a mechanical ball mill, and setting ball milling time to be 3-48h, ball milling rotation speed to be 200-mesh and 600r/min and ball material ratio to be 6: 1; after the ball milling is finished, the obtained metal with catalytic activity is attached to the surface of the hydrogen storage alloy in an amorphous state and is marked as a catalyst La-Co. The preparation method of the Co-B comprises the following steps: NaBH4 is prepared into a 0.01-10mol/L solution, soluble metal salt CoNO3 is dissolved in deionized water to prepare a 0.05-5mol/L solution, NaBH4 is slowly dripped into the soluble metal salt solution under magnetic stirring at room temperature, and the obtained powder is filtered and vacuum-dried to obtain the amorphous metal boride alloy.
The obtained catalyst is applied to the preparation of hexafluoroisopropanol by the gas-phase catalytic hydrogenation of hexafluoroacetone. The method specifically comprises the following steps: filling a catalyst into a hydrogenation chamber, gasifying hexafluoroacetone hydrate at 110 ℃, introducing the gasified hexafluoroacetone hydrate and mixed gas of hydrogen and nitrogen into the hydrogenation chamber filled with the catalyst, wherein the reduction temperature of the hydrogen chamber is 200 ℃, the reduction time is 1-3 hours, and the molar ratio of hydrogen to hexafluoroacetone is 20: 1; and after the reaction is finished, the reaction product enters a product treatment unit for product separation.
Example 4: the preparation method of the catalyst comprises the following steps: firstly, mechanically grinding a metal hydrogen storage material LaNi5 into alloy powder of 200-mesh and 600-mesh, then mixing metal boride Co-B and metal hydrogen storage material powder according to a ratio of 5:1, putting a mixed sample into a mechanical ball mill, and setting ball milling time to be 3-48h, ball milling rotation speed to be 200-mesh and 600r/min and ball material ratio to be 6: 1; after the ball milling is finished, the obtained metal with catalytic activity is attached to the surface of the hydrogen storage alloy in an amorphous state and is marked as a catalyst La-Co. The preparation method of the Co-B comprises the following steps: NaBH4 is prepared into a 0.01-10mol/L solution, soluble metal salt CoNO3 is dissolved in deionized water to prepare a 0.05-5mol/L solution, NaBH4 is slowly dripped into the soluble metal salt solution under magnetic stirring at room temperature, and the obtained powder is filtered and vacuum-dried to obtain the amorphous metal boride alloy.
The obtained catalyst is applied to the preparation of hexafluoroisopropanol by the gas-phase catalytic hydrogenation of hexafluoroacetone. The method specifically comprises the following steps: filling a catalyst into a hydrogenation chamber, gasifying hexafluoroacetone hydrate at 110 ℃, introducing the gasified hexafluoroacetone hydrate and mixed gas of hydrogen and nitrogen into the hydrogenation chamber filled with the catalyst, wherein the reduction temperature of the hydrogen chamber is 150 ℃, the reduction time is 1-3 hours, and the molar ratio of hydrogen to hexafluoroacetone is 10: 1; and after the reaction is finished, the reaction product enters a product treatment unit for product separation.
Example 5:
the preparation method of the catalyst comprises the following steps: firstly, mechanically grinding a metal hydrogen storage material LaNi5 into alloy powder of 200-mesh and 600-mesh, then mixing metal boride Co-B and metal hydrogen storage material powder according to a ratio of 5:1, putting a mixed sample into a mechanical ball mill, and setting ball milling time to be 3-48h, ball milling rotation speed to be 200-mesh and 600r/min and ball material ratio to be 6: 1; after the ball milling is finished, the obtained metal with catalytic activity is attached to the surface of the hydrogen storage alloy in an amorphous state and is marked as a catalyst La-Co. The preparation method of the Co-B comprises the following steps: NaBH4 is prepared into a 0.01-10mol/L solution, soluble metal salt CoNO3 is dissolved in deionized water to prepare a 0.05-5mol/L solution, NaBH4 is slowly dripped into the soluble metal salt solution under magnetic stirring at room temperature, and the obtained powder is filtered and vacuum-dried to obtain the amorphous metal boride alloy.
The obtained catalyst is applied to the preparation of hexafluoroisopropanol by the gas-phase catalytic hydrogenation of hexafluoroacetone. The method specifically comprises the following steps: filling a catalyst into a hydrogenation chamber, gasifying hexafluoroacetone hydrate at 110 ℃, introducing the gasified hexafluoroacetone hydrate and mixed gas of hydrogen and nitrogen into the hydrogenation chamber filled with the catalyst, wherein the reduction temperature of the hydrogen chamber is 350 ℃, the reduction time is 1-3 hours, and the molar ratio of hydrogen to hexafluoroacetone is 10: 1; and after the reaction is finished, the reaction product enters a product treatment unit for product separation.
Comparative example 1:
5 percent Pd/C is used as a catalyst to be applied to the preparation of hexafluoroisopropanol by the gas-phase catalytic hydrogenation of hexafluoroacetone. The method specifically comprises the following steps: filling a catalyst into a hydrogenation chamber, gasifying hexafluoroacetone hydrate at 110 ℃, introducing the gasified hexafluoroacetone hydrate and mixed gas of hydrogen and nitrogen into the hydrogenation chamber filled with the catalyst, wherein the reduction temperature of the hydrogen chamber is 200 ℃, the reduction time is 1-3 hours, and the molar ratio of hydrogen to hexafluoroacetone is 10: 1; and after the reaction is finished, the reaction product enters a product treatment unit for product separation.
The effect of the different examples on the reaction yield as well as on the selectivity is shown in table 1.
TABLE 1
| Examples | Conversion rate% | Selectivity% |
| 1 | 99.8 | 100 |
| 2 | 98.5 | 100 |
| 3 | 99.8 | 100 |
| 4 | 96.8 | 100 |
| 5 | 96.1 | 99.6 |
| Comparative example 1 | 92.3 | 97.2 |
As can be seen from Table 1, the method for preparing hexafluoroisopropanol by gas phase hydrogenation can be used for reaction under mild conditions, and has low requirements on reaction equipment; the catalyst has high catalytic activity and high selectivity, and almost no by-product is generated; the catalyst of the invention has simple preparation, easy molding and large-scale production.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (2)
1. The method for preparing hexafluoroisopropanol by gas-phase hydrogenation is characterized by comprising the following steps: filling a catalyst into a hydrogenation chamber, gasifying hexafluoroacetone hydrate at 110 ℃, introducing the gasified hexafluoroacetone hydrate and mixed gas of hydrogen and nitrogen into the hydrogenation chamber filled with the catalyst, wherein the reduction temperature of the hydrogen chamber is 150-350 ℃, the reduction time is 1-3 hours, and the molar ratio of hydrogen to hexafluoroacetone is 3-20: 1; after the reaction is finished, the reaction product enters a product processing unit for product separation;
the catalyst comprises the following components in parts by mass: 5-10 parts of metal hydrogen storage material; 1 part of metal boride; the metal hydrogen storage material is LaNi5Or La0.67Mg0.33Ni3.0One kind of (1); one of the metal boride Co-B, Ni-B, Pd-B alloy;
the preparation method of the catalyst comprises the following steps: firstly, mechanically grinding a metal hydrogen storage material into 200-mesh 600-mesh alloy powder, then mixing metal boride and the metal hydrogen storage material powder, putting the mixed sample into a mechanical ball mill, and setting the ball milling time to be 3-48h, the ball milling rotation speed to be 200-mesh 600r/min and the ball-to-material ratio to be 12:1-2: 1; after the ball milling is finished, the metal with catalytic activity is obtained and is attached to the surface of the hydrogen storage alloy in an amorphous state.
2. The method for preparing hexafluoroisopropanol by gas-phase hydrogenation as claimed in claim 1, wherein said product treatment unit comprises sequentially connected product 65 ° condensing unit for recovering raw material, 30 ° condensing unit for obtaining hexafluoroisopropanol product and 0 ℃ cold trap for recovering low-boiling by-products.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR1361260A (en) * | 1962-07-03 | 1964-05-15 | Allied Chem | Production process for hexafluoroisopropyl alcohol |
| JPH0672923A (en) * | 1991-10-28 | 1994-03-15 | Snow Brand Milk Prod Co Ltd | Hydrogenation reduction of carbonyl compound |
| US7659433B2 (en) * | 2004-02-04 | 2010-02-09 | Halocarbon Products Corporation | Purification of 1,1,1,3,3,3-hexafluoroisopropanol |
| CN102274734B (en) * | 2010-06-13 | 2013-10-16 | 中化蓝天集团有限公司 | Catalyst used for gas phase catalytic hydrogenation of hexafluoroacetone hydrate for preparing hexafluoroisopropanol and preparation method and application thereof |
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