Carboxylic ester hydrogenation catalyst and method for preparing cyclohexanol and ethanol

A technology of hydrogenation catalyst and carboxylate, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., and can solve problems such as no information disclosure

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Known from the published literature, there is no information disclosure about the hydrogenation of cyclohexyl acetate to co-produce cyclohexanol and ethanol in the prior art

Method used

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  • Carboxylic ester hydrogenation catalyst and method for preparing cyclohexanol and ethanol
  • Carboxylic ester hydrogenation catalyst and method for preparing cyclohexanol and ethanol
  • Carboxylic ester hydrogenation catalyst and method for preparing cyclohexanol and ethanol

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0038] The present invention also provides a kind of preparation method of carboxylic acid ester hydrogenation catalyst, comprising:

[0039] (1) Composite metal oxides are prepared by co-precipitation; the composite metal oxides include (a) copper oxide, (b) zinc oxide, (c) oxidation of one or more metals selected from the following groups substances, aluminum, gallium, tin, titanium, zirconium, chromium, molybdenum, tungsten, manganese, rhenium, lanthanide metals and actinide metals; in the composite metal oxide, component (a) 5-60 parts, component (b) 10-50 parts, component (c) 5-60 parts;

[0040] (2) impregnating the composite metal oxide obtained in step (1) with an aqueous alkali metal hydroxide and / or alkaline earth metal hydroxide solution with a mass fraction of 0.5-5%, and then filtering, drying, and roasting to obtain the product.

[0041] Preferably, component (c) is an oxide of one or more metals selected from the following group: aluminum, gallium, tin, titaniu...

Embodiment 1～6

[0065] Embodiment 1~6 (preparation of catalyst)

[0066] The catalysts of Examples 1 to 6 were prepared according to the following procedure: weigh a certain amount of soluble metal salt according to the formula in Table 1, place it in a 2000mL three-neck flask, add water to dissolve and prepare about 1000mL solution, and install a stirrer and a pH meter on the flask and a thermometer, and place the flask in a temperature-adjustable constant temperature water bath, start stirring, adjust the temperature of the constant temperature water bath, gradually drop a certain concentration of precipitant solution into the flask, control the drop rate of the precipitant aqueous solution, and increase the temperature of the solution. The high temperature is controlled within 1°C. As the pH of the solution increases, precipitation occurs in the solution, and gradually increases as the pH increases. When the pH of the solution reaches the specified value, the dropwise addition of the preci...

Embodiment 7～15

[0067] Examples 7-15 (catalyst evaluation in autoclave)

[0068] Embodiment 7~15 is the cyclohexyl acetate hydrogenation test of the catalyst that carries out example 1~6 in autoclave, test procedure is as follows: get a certain amount of catalyst powder and be placed in 500mL autoclave, add 250g cyclohexyl acetate Hexyl ester, the reaction kettle was closed, replaced with nitrogen three times, hydrogen gas was introduced to a certain pressure, and the temperature was gradually raised. At about 80°C, the pressure in the kettle began to drop, indicating that the catalyst in the kettle began to reduce, and the ester hydrogenation reaction began. Timely Supplement hydrogen to maintain a certain pressure in the reactor, and finally raise the temperature to a given temperature, and maintain the pressure at this temperature for a certain period of time, then stop the reaction, cool down to room temperature, and unload the reaction product and catalyst. Analyze the product compositio...

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Abstract

The invention relates to a carboxylic ester hydrogenation catalyst and a method for preparing cyclohexanol and ethanol. The catalyst comprises the following components in parts by mass: 5-60 parts of copper oxide (a), 10-50 parts of zinc oxide (b) and 5-60 parts of oxide (c) of metal selected from one or more of aluminum, gallium, tin, titanium, zirconium, chromium, molybdenum, tungsten, manganese, rhenium, lanthanide metals and actinide metals, and (d) one or more of 0.2-2 parts of alkali metal hydroxides and alkaline-earth metal hydroxide. According to the catalyst and the method, the cyclohexanol and the ethanol can be coproduced through carboxylic ester hydrogenation.

Description

technical field [0001] The invention relates to a carboxylic acid ester hydrogenation catalyst and a method for preparing cyclohexanol and ethanol. Background technique [0002] Both cyclohexanol and ethanol are important chemical raw materials and solvents. Cyclohexanol is mainly used to produce nylon 6, nylon 66, etc., while ethanol is a raw material for synthetic esters and other chemical products, and is also widely used as a fuel additive for gasoline. [0003] Industrially, the production methods of cyclohexanol mainly include cyclohexane air oxidation method, phenol hydrogenation method and cyclohexene hydration method. The cyclohexane air oxidation method has been criticized by the industry because of its poor selectivity, a large number of by-products, low product yield, and a large amount of waste lye. Phenol hydrogenation is a relatively clean technical route for the production of cyclohexanol, and has the advantages of short process flow, high product purity, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J23/83B01J23/835C07C29/149C07C31/08C07C35/08
Inventor 温朗友宗保宁慕旭宏杨克勇郜亮俞芳董明会喻惠利
Owner CHINA PETROLEUM & CHEM CORP
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