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Method for preparing succinic anhydride in high-selective and hydrogenating manner by using quenching Raney nickel to catalyze maleic anhydride under mild condition

A maleic anhydride, high-selectivity technology, applied in the direction of organic chemistry, can solve the problems of unsatisfactory conversion rate and selectivity, expensive noble metal Pd, harsh reaction temperature and pressure, etc., and achieve low production cost and short reaction time , the effect of reducing the reaction conditions

Inactive Publication Date: 2010-08-18
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN200510012808.2 uses skeleton nickel as a catalyst, in benzene as a solvent, 30-100 ° C, 0.2-0.8 MPa, although the conditions are relatively mild, the conversion rate and selectivity are not ideal
Precious metal Pd is expensive and expensive to produce
Nickel-based catalysts are widely used, but the reaction temperature and pressure of existing catalysts are relatively harsh, most of which have a temperature exceeding 150°C and a pressure exceeding 1.5MPa

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put into 2 gram maleic anhydrides, 20 milliliters of solvents, the catalyst after 0.02 gram activation in the interstitial high pressure reactor that volume is 70 milliliters. After sealing, replace with nitrogen and hydrogen respectively three times, then fill with a small amount of hydrogen, put it in a water bath and raise the temperature to 40°C, adjust the hydrogen valve to make the system pressure reach 0.2MPa, and keep it for 30 minutes. Sampling was carried out for gas chromatography analysis, the conversion rate was 100%, and the selectivity of the product succinic anhydride was 100%.

Embodiment 2

[0020] 6 grams of maleic anhydride, 60 milliliters of 1,4-dioxane, and 0.06 gram of activated catalyst were put into a 200 milliliter gap-type high-pressure reactor with a volume. After sealing, replace with nitrogen and hydrogen respectively three times, then fill with a small amount of hydrogen, put it in a water bath and raise the temperature to 40°C, adjust the hydrogen valve to make the system pressure reach 0.2MPa, and keep it for 30 minutes. Sampling was carried out for gas chromatography analysis, the conversion rate was 100%, and the selectivity of the product succinic anhydride was 100%.

Embodiment 3

[0022] Put 20 grams of maleic anhydride, 200 milliliters of 1,4-dioxane, and 0.2 grams of activated catalyst in a 0.5-liter gap-type high-pressure reactor. After sealing, replace with nitrogen and hydrogen respectively three times, then fill with a small amount of hydrogen, put it in a water bath and raise the temperature to 40°C, adjust the hydrogen valve to make the system pressure reach 0.2MPa, and keep it for 40 minutes. Sampling was carried out for gas chromatography analysis, the conversion rate was 100%, and the selectivity of the product succinic anhydride was 100%.

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PUM

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Abstract

The invention relates to a method for preparing succinic anhydride in high-selective and hydrogenating manner by using quenching Raney nickel to catalyze maleic anhydride under the mild condition. The method comprises the following steps that: the maleic anhydride, a solvent and a modified Raney nickel catalyst are added into a batch high-pressure reactor, the mass ratio of the solvent and the maleic anhydride is 2-30, the used amount of the modified Raney nickel catalyst is 0.1-10 percent of the mass of the maleic anhydride, nitrogen and hydrogen are respectively used for replacing the mixture for three times after being closed, a certain amount of hydrogen is filled, the obtained mixture is placed into the water bath for slowly heating till the reaction temperature is 10-60 DEG C, the system pressure is adjusted to be 0.1-1MPa, reaction starts, and the reaction time is 10-300 minutes. The catalyst adopts the modified Raney nickel prepared by a quenching method. The method has the benefits of: having short reaction time, high production efficiency, capability of repeatedly using the catalyst and low production cost and being suitable for industrial production.

Description

technical field [0001] The invention belongs to the application technical field of heterogeneous catalytic hydrogenation, and relates to the application of a high-activity modified skeleton nickel catalyst in the hydrogenation of maleic anhydride to prepare high value-added succinic anhydride, which is a kind of catalyzed catalyst under quenched skeleton nickel and mild conditions. The invention discloses a method for preparing succinic anhydride by highly selective hydrogenation of maleic anhydride, which can realize the preparation of succinic anhydride by highly selective hydrogenation of maleic anhydride under mild conditions. Background technique [0002] Succinic anhydride, also known as succinic anhydride, is an important intermediate with a wide range of uses. In medicine, it can be used to synthesize vitamin A, erythromycin ethylsuccinate (Lijunsha) and other drugs. At the same time, succinic anhydride is also widely used in the synthesis of pesticides, resins, pai...

Claims

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Application Information

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IPC IPC(8): C07D307/60
Inventor 吕连海杜文强刘益材
Owner DALIAN UNIV OF TECH