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Method for preparing lactic acid by catalytic oxidation of 1,2-propylene glycol

A technology for catalytic oxidation and propylene glycol, applied in 1 field, can solve problems such as less application, and achieve the effects of improving efficiency, low cost and reducing cost

Active Publication Date: 2011-11-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The unique basic sites of magnesium-containing supports may promote the catalytic oxidation of alcohols by interacting with hydroxyl groups or hydrogen, but such magnesium-containing catalyst supports are rarely used in related reactions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 0.12 g of AuPt / dolomite (Au0.5wt%, Pt2wt%) catalyst, 1 g of 1,2-propylene glycol, 1.2 g of NaOH, and 10 ml of water into a stainless steel autoclave with a polytetrafluoroethylene lining inside. The temperature was raised to a reaction temperature of 40° C. using an automatic temperature controller, and 1.2 MPa oxygen was added to react for 9 hours, keeping the pressure constant during the reaction. The reaction product was analyzed by HPLC, and the reaction results are shown in Table 1.

Embodiment 2

[0020] 0.2 g of AuRu / MgO (Au 1.2 wt%, Ru 0.2%) catalyst, 1 g of 1,2-propylene glycol, 1.4 g of NaOH and 10 ml of water were added to a stainless steel autoclave with a polytetrafluoroethylene liner inside. The temperature was raised to a reaction temperature of 50° C. using an automatic temperature controller, and 0.3 MPa oxygen was added to react for 3 hours, keeping the pressure constant during the reaction. The reaction product was analyzed by HPLC, and the reaction results are shown in Table 1.

Embodiment 3

[0022] 0.22 g of AuPd / MgCeO x (Au0.2wt%, Pd2wt%, Mg: Ce=4:1) catalyst, 1 gram of 1,2-propylene glycol, 1.0 gram of NaOH and 10 milliliters of water were added to a stainless steel autoclave with a polytetrafluoroethylene lining inside. The temperature was raised to a reaction temperature of 50° C. using an automatic temperature controller, and 0.3 MPa oxygen was added to react for 3 hours, keeping the pressure constant during the reaction. The reaction product was analyzed by HPLC, and the reaction results are shown in Table 1.

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Abstract

The invention discloses a method for preparing lactic acid by catalytic oxidation of 1,2-propylene glycol. The 1,2-propylene glycol can be catalyzed with high efficiency and high selectivity to synthesize the lactic acid by using a gold-based catalyst and using oxygen or air as an oxidant. The operation conditions are mild, the conversion rate of the 1,2-propylene glycol reaches 92 percent, and the selectivity of the lactic acid is 99 percent.

Description

technical field [0001] The invention relates to the field of chemistry and chemical engineering, in particular to a method for preparing lactic acid by catalytic oxidation of 1,2-propanediol. Background technique [0002] Lactic acid is a chemical with high demand and wide application. It can be used as the starting material of polylactic acid (PLA) to produce a new generation of biodegradable plastics. It can also be used as food additives, preservatives, carriers, co-solvents , pharmaceutical preparations, pH regulators. At present, lactic acid is produced by fermentation from raw materials such as glucose, starch, liquefied starch, and sucrose. The traditional production method is the fermentation method, which has high cost, complicated products and difficult separation and purification. [0003] The preparation of lactic acid by catalytic oxidation of 1,2-propanediol is a new raw material route and synthetic method with important application prospects, high efficiency...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/08C07C51/235B01J27/232B01J23/52B01J23/66B01J27/236
Inventor 马红徐杰蔡嘉莹高进苗虹张展
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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