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Hydrogenation method of 1,2-propylene glycol by bio-based glycerol

A bio-based, propylene glycol technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, preparation of hydroxyl groups, etc., can solve the problem of low catalyst stability, achieve stable activity, mild conditions, cost saving effect

Inactive Publication Date: 2012-08-15
江苏联东化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, when hydrogenating glycerol to prepare 1,2-propanediol, high temperature and high pressure are mostly used, and the stability of the catalyst is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Catalyst preparation: Prepare Cu, Zn, Al nitrate and sodium metavanadate according to the Cu / Zn / Al / V mass ratio of 45 / 27 / 25 / 3 to prepare an aqueous solution with a total concentration of 1mol / L, and pour it into it under stirring Add 1mol / L Na dropwise 2 CO 3 solution, adjust the pH value to about 8, age for 4 hours, filter, wash the precipitate until the pH of the washing solution is 7, dry at 110°C for 6 hours, and bake at 350°C for 5 hours.

[0015] Before using the catalyst obtained above, the catalyst was pressed into tablets and activated with hydrogen gradually increasing the temperature to 300° C., and the total reduction time was 24 hours.

[0016] Hydrogenation synthesis: The solvent is methanol and glycerol solution with a concentration of 40%, and hydrogenation synthesis is carried out in a 100ml fixed-bed hydrogenation reactor. The main conditions are: space velocity 0.5 / h, hydrogen-oil ratio 600, pressure 2MPa, temperature 220 Spend.

[0017] After the ...

Embodiment 2

[0019] Catalyst preparation: prepare Cu, Zn, Al nitrate and ammonium metavanadate according to the Cu / Zn / Al / V mass ratio of 40 / 30 / 29 / 1 to prepare an aqueous solution with a total concentration of 1mol / L, and pour it into it under stirring Add 1mol / L Na dropwise 2 CO 3 solution, adjust the pH value to about 8, age for 4 hours, filter, wash the precipitate until the pH of the washing solution is 7, dry at 110°C for 6 hours, and bake at 350°C for 5 hours.

[0020] Before using the catalyst obtained above, it was compressed into tablets and activated with hydrogen gradually increasing the temperature to 300°C for a total reduction time of 24 hours.

[0021] Hydrogenation synthesis: Take 95% medical grade industrial-grade glycerin produced by biodiesel by-products, prepare a 60% glycerin solution with ethanol as a solvent, and carry out hydrogenation synthesis in a 100ml fixed-bed hydrogenation reactor. The main reaction Conditions: space velocity 1.0 / h, hydrogen-oil ratio 1000, ...

Embodiment 3

[0024] The catalyst and reaction conditions are the same as those in Example 2, and the glycerin used as the reaction raw material for hydrogenation is 95% technical grade glycerol produced from biodiesel by-products.

[0025] After the reaction, the conversion rate of glycerol was 95%, and the selectivity of 1,2-propanediol produced by the reaction was 90%.

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PUM

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Abstract

The invention discloses a hydrogenation method of 1,2-propylene glycol by bio-based glycerol. The method comprises the following steps: filling a catalyst in a continuous fixed bed reactor, pressurizing a glycerol solution and hydrogen to flow into the reactor, and controlling the reaction temperature to be between 180 and 240 DEG C and the reaction pressure to be between 1.2 and 2.5MPa, wherein the solvent in the glycerol is methanol or ethanol, and the ratio of Cu, Zn, Al and V in the catalyst is (20-50):(10-50):(10-50):(1-5). The 1,2-propylene glycol hydrogenated by the bio-based glycerol has the advantages of low temperature, low pressure and mild reaction condition; and the stability of the catalyst is high.

Description

technical field [0001] The invention specifically relates to a method for synthesizing 1,2-propanediol through hydrogenation of bio-based glycerol. Background technique [0002] In recent years, due to the rapid development of biodiesel, 10% of glycerin is produced per ton of diesel oil. Due to the large amount of glycerin output but no development of downstream products, the supply of glycerin in the market has exceeded demand, and the price has dropped sharply. 1,2-Propanediol can be used as a raw material for unsaturated resins, a large amount of antifreeze, and a raw material for plasticizers, surfactants, emulsifiers and demulsifiers. It can be used as antifungal agent, fruit ripening agent, preservative, antifreeze agent and tobacco humectant. In the prior art, when hydrogenating glycerol to prepare 1,2-propanediol, high temperature and high pressure are mostly used, and the stability of the catalyst is low. Contents of the invention [0003] The object of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/60B01J23/847
Inventor 刘卫星蒋继星梁智顺
Owner 江苏联东化工有限公司