Method of preparing gamma butyrolactone by 1,4-butanediol dehydrogenation

A technology for butanediol and butyrolactone is applied in the field of preparing γ-butyrolactone by dehydrogenation of 1,4-butanediol, which can solve the problems of production personnel and environmental hazards, low catalyst processing capacity, decreased catalyst activity, and the like. Achieve the effects of good stability, low price and reduced power consumption

Inactive Publication Date: 2006-05-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The deficiencies in the above technology exist: although the catalysts used have higher activity and selectivity, some contain precious metals, and some contain highly toxic and polluting Cr components. Great harm to people and the environment
Most of the catalysts in the above-mentioned prior art do not have long-term operation data, although some have provided long-term operation data, but the catalyst processing capacity is low, and after continuous operation, the catalyst activity decreases significantly
In addition, the molar ratio of hydroalcohol in the prior art is relatively large. To obtain high γ-butyrolactone selectivity, the molar ratio of hydroalcohol must be ≥ 3, or even 34, and the power consumption is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 35.5g Cu(NO 3 ) 2 .3H 2 O, 47.4g 50% Mn(NO) 2 Aqueous solution, 4g Al(NO 3 ) 3 .9H 2 O, dissolved in 500ml deionized water to make solution A. Na 2 CO 3 (23w%) to make solution B. Add solution A to B. Keep the final pH at 9±0.5, age for 1 hour after titration, then filter, wash with water 3 times, collect the precipitate, dry at 120°C for 12 hours, and roast at 750°C for 3 hours to obtain catalyst A: CuMn 0.87 Al 0.05 o 1.9 .

Embodiment 2

[0026] 35.5g Cu(NO 3 ) 2 .3H 2 O (Beijing Chemical Plant, chemically pure), 51g 50% Mn (NO) 2 .Aqueous solution (Beijing Chemical Plant, chemically pure), 10.7g Al(NO 3 ) 3 .9H 2 O (Beijing Chemical Plant, chemically pure), be dissolved in 500ml of deionized water, add ammoniacal liquor (23w%, Beijing Chemical Plant, chemically pure) dropwise under stirring, and age for 1 hour when the pH of the solution is 6.0, then filter and wash once Collect the precipitate, dry at 200°C for 2 hours, and bake at 500°C for 2 hours to obtain catalyst B: CuMn 0.46 Al 0.2 o 1.76

Embodiment 3

[0028] 52.2g Cu(NO 3 ) 2 .3H 2O, 91g 50% Mn(NO) 2 .Aqueous solution, 122g Al(NO 3 ) 3 .9H 2 O, dissolved in 500ml deionized water to make solution A. Na 2 CO 3 (23w%) to make solution B. Put 200ml of deionized water into a 1000ml beaker, add the two solutions A and B into the beaker at the same time under stirring, control the dripping speed of A and B, keep the pH at 5±0.5, aging for 1 hour after titration, then filter, Washed 6 times with water, collected the precipitate, dried at 120°C for 3 hours, and calcined at 500°C for 2 hours to obtain catalyst C: CuMn 0.9 Al 1.5 o 4.2 .

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PUM

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Abstract

A method for preparing γ-butyrolactone by dehydrogenating 1,4-butanediol, comprising: passing 1,4-butanediol through a reactor under the condition of 170-300°C and 0.1-1MPa in a hydrogen atmosphere, and having the following The above expression for the oxide catalyst contact: CuMn a Al b o c , where a=0.05-1.5, b=0.01-2, and c is the number of oxygen atoms satisfying the requirement that the molecular charge is 0. The catalyst used in the method of the invention does not contain chromium, avoids Cr pollution, and has high catalyst activity and good stability. After 2100 hours of continuous operation, its activity and gamma-butyrolactone selectivity are basically the same as those at the initial stage.

Description

technical field [0001] The invention relates to a method for preparing gamma-butyrolactone by dehydrogenating 1,4-butanediol. technical background [0002] γ-butyrolactone is an important organic chemical product. It is an intermediate in the synthesis of butyric acid compounds, polyvinylpyrrolidone, methionine, vitamin B1 and brain rehabilitation. It is a suitable solvent for acrylate and styrene polymers. Can be used as a useful ingredient in paints, detergents and textile auxiliaries. [0003] Known methods for preparing gamma-butyrolactone are mainly divided into two classes, one is the gas-phase hydrogenation of maleic anhydride or its ester to prepare gamma-butyrolactone, such as US 4,584,419; US 3,853,922; US 3,829,448; CN 1034541A stated. The other is 1,4-butanediol catalytic dehydrogenation to γ-butyrolactone, which will be described below [0004] related technologies. [0005] 1, 4-butanediol catalytic dehydrogenation system gamma-butyrolactone, there are two ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/33
Inventor 王海京高国强刘易
Owner CHINA PETROLEUM & CHEM CORP
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