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Method for producing 1-propylene glycol with glycerol hydrogenation

A technology for the preparation of hydrogen and propylene glycol, which is applied to the hydrogenation of glycerol to prepare 1, which can solve the problems of environmental pollution, low selectivity and conversion rate, and achieve the effect of simple catalyst composition, high selectivity and high conversion rate

Inactive Publication Date: 2008-06-11
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this catalyst system contains metal chromium, which will pollute the environment; the selectivity and conversion rate are low

Method used

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  • Method for producing 1-propylene glycol with glycerol hydrogenation
  • Method for producing 1-propylene glycol with glycerol hydrogenation
  • Method for producing 1-propylene glycol with glycerol hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 30 grams of copper nitrate and 200 ml of water into the reactor, and stir the solution at 30°C. Titrate with 15% sodium hydroxide and stop when pH=8-9. Solution A was formed.

[0023] Mix solution A with 44ml of silica sol containing 40% silica, heat up to 80°C, age for 4 hours; filter; dry at 120°C for 16 hours, and bake at 400°C for 4 hours. Get CuO(30%wt) / SiO 2 (70%wt) hydrogenation catalyst. The above-mentioned catalyst is crushed into small particles, sieved, and set aside.

Embodiment 2

[0025] Hydrogen reduction of the above catalyst particles, 5% glycerin methanol solution. A tank reaction was adopted, and the hydrogenation reaction was carried out at 150° C. and 6.5 MPa for 12 hours. The catalyst was isolated and sampled for gas chromatographic analysis. The results are shown in Table 1.

Embodiment 3

[0027] The above catalyst particles were reduced with hydrogen, 20% glycerol in methanol. A tank reaction was adopted, and the hydrogenation reaction was carried out at 150° C. and 6.5 MPa for 12 hours. The catalyst was isolated and sampled for gas chromatographic analysis. The results are shown in Table 1.

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Abstract

The invention discloses a method for preparing 1, 2-propylene glycol reaction hydrogenated by glycerol, which adopts CuO-SiO2 as catalyst, one or two of carbinol and water as reaction solvent. The glycerol is hydrogenated to prepare 1, 2-propylene glycol under the operation condition of reaction temperature of 140-200 DEG C and reaction pressure of 4.0-10.0 Mpa. The inventive catalyst adopts normal preparation procedure and the catalyst composition is simple and doesn't contain chromium metal. The alcohol-water mixed solvent system realizes high conversion rate of the reaction.

Description

technical field [0001] The invention relates to a method for preparing 1,2-propanediol by hydrogenation of glycerin. technical background [0002] 1,2-propanediol is an important chemical raw material, and its main use is as an intermediate for coatings and reinforced plastics in the production of unsaturated polyester resins. Propylene glycol is widely used in food, medicine and cosmetics due to its low toxicity, wettability and excellent solubility. It is used to produce tobacco wetting agents, small animal food, polymer plasticizers and special plasticizers. Recently, new applications for liquid detergents have been developed. And along with the development of the national economy, only the output of unsaturated polyester resin products is increasing at an annual rate of 10% to 20%, and the demand for 1,2-propanediol will increase at the same rate. [0003] In recent years, countries around the world have gradually promoted biodiesel from considerations of environmental...

Claims

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Application Information

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IPC IPC(8): C07C29/60C07C31/20B01J23/72B01J21/08
Inventor 崔芳陈静夏春谷黄志威张新志童进
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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