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Method for preparing acid by catalytic dehydrogenation of alcohol under solvent-free conditions

A catalytic dehydrogenation, solvent-free technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylates, etc., can solve the problems of poor catalyst stability, easy aggregation, catalyst deactivation, etc. The effect of low reaction temperature and high catalyst activity

Active Publication Date: 2021-08-24
珠海市格特生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Cu-based heterogeneous catalysts are nanoparticles, which are easy to aggregate under high-temperature aqueous reaction conditions, resulting in catalyst deactivation and poor catalyst stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: (catalyzed dehydrogenation of ethylene glycol prepares glycolic acid)

[0023] Ethylene glycol is added in the round-bottomed flask that has reflux device, then add Cu / MgO catalyst (addition is 15% of the ethylene glycol quality, the mass percentage of Cu in Cu / MgO catalyst is 20%), then add NaOH (the molar ratio of ethylene glycol and NaOH is 1:1.2), through normal pressure N 2 , heated to 180° C., and reacted for 1 hour. After the reaction, samples were taken for gas phase and liquid phase analysis.

[0024] After testing, the conversion rate of ethylene glycol is 100%, and the yield of glycolic acid is 92%.

Embodiment 2

[0025] Embodiment 2: (preparation of lactic acid by catalytic dehydrogenation of 1,2-propanediol)

[0026] 1,2-propanediol is added in the round bottom flask that has reflux device, then add Ni / ZnO catalyst (addition is 10% of 1,2-propanediol quality, the mass percentage of Ni in Ni / ZnO catalyst is 5% ), then add NaOH (1,2-propanediol, the molar ratio of NaOH is 1:1), pass into normal pressure N 2 , heated to 140° C., and reacted for 2 hours. After the reaction, samples were taken for gas phase and liquid phase analysis.

[0027] After testing, the conversion rate of 1,2-propanediol was 98%, and the yield of lactic acid was 86%.

Embodiment 3

[0028] Embodiment 3: (preparation of lactic acid by catalytic dehydrogenation of glycerol)

[0029] Add glycerol to a round-bottomed flask with reflux, followed by Cu / ZrO 2 Catalyst (addition is 5% of glycerol quality, Cu / ZrO 2 The mass percent of Cu in the catalyst is 30%), then add KOH (the molar ratio of glycerol and KOH is 1:1.1), and pass into normal pressure N 2 , heated to 120°C, and reacted for 0.5h. After the reaction, samples were taken for gas phase and liquid phase analysis.

[0030] After testing, the conversion rate of glycerol is 95%, and the yield of lactic acid is 65%.

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PUM

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Abstract

The invention discloses a method for preparing an acid by catalytic dehydrogenation of alcohol under the condition of no solvent, which comprises the following steps: under a protective atmosphere, adding a supported metal catalyst and a basic additive to the alcohol, performing catalytic dehydrogenation reaction, and obtaining the acid; The supported metal catalyst is based on at least one of magnesium oxide, zinc oxide, zirconium dioxide, ceria, lanthanum trioxide, hydroxyapatite, activated carbon, carbon nanofibers, and carbon nanotubes as a carrier, with Cu, At least one of Ni is an active component. The invention carries out the reaction of alcohol catalytic dehydrogenation to prepare acid under solvent-free conditions, avoids the problem of catalyst aggregation and deactivation, and has the advantages of low reaction temperature, short reaction time, low catalyst cost, high catalyst activity and good stability.

Description

technical field [0001] The invention relates to a method for preparing acid by catalytic dehydrogenation of alcohol under solvent-free conditions. Background technique [0002] Glycolic acid, lactic acid and 3-hydroxypropionic acid are fine chemicals with high added value, which are widely used in food, medicine, cosmetics, agriculture and chemical industry, and they can also be used as monomers to synthesize biodegradable Plastics such as polyglycolic acid, polylactic acid, and poly-3-hydroxypropionic acid. At present, the industrial production method of glycolic acid, lactic acid and 3-hydroxypropionic acid is mainly fermentation method, which has problems such as high cost, low yield and difficult separation and purification of products. Therefore, the development of new efficient methods to prepare glycolic acid, lactic acid, and 3-hydroxypropionic acid is still a hot issue. [0003] Glycerol is a by-product in the biodiesel production process, and every 10 tons of bio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/00C07C59/06C07C59/08C07C59/01
CPCC07C51/00C07C59/06C07C59/08C07C59/01
Inventor 张俊杰麦裕良王曦蒋婷婷陈佳志张磊高敏
Owner 珠海市格特生物科技有限公司
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