Catalyst for preparing 1,2-propylene glycol by glycerinum hydrogenation and preparation method thereof

Abstract

The invention discloses a catalyst for preparing 1,2-propylene glycol by glycerinum hydrogenation and a preparation method of the catalyst, and belongs to a catalyst containing metal or a metallic oxide. The catalyst is characterized by comprising the following raw material components in percentage by weight: 10%-40% of heteropoly acid, 30%-90% of a carrier, 5%-20% of active components, and 0.5%-10% of a modified component. The catalyst and the preparation method thereof provided by the invention have the advantages that the activity is high, the selectivity is good, a reaction condition is mild, the reaction speed is high, the conversion rate of the raw materials is high, and the energy consumption is low. The catalyst provided by the invention has an acid site and a metal hydrogenation site, is a dual-function catalyst, is high in reactivity, selectivity and stability, still keeps the high efficiency at the large air speed, and has good industrial application prospect; the catalyst provided by the invention has the advantages that the operating pressure is low, the equipment investment is saved, the energy consumption is low, and the glycerinum conversion rate can achieve 90.12%.

Description

Technical field [0001] The invention is a catalyst for preparing 1,2-propanediol by hydrogenation of glycerol and a preparation method thereof. Belongs to catalysts containing metals or metal oxides. Background technique [0002] 1,2-Propylene glycol is an important chemical raw material, which is mainly used as raw material for unsaturated polyester resin, epoxy resin and polyurethane resin. Among them, unsaturated polyester is widely used in surface coatings and reinforced plastics. Because of its low toxicity, wettability and excellent solubility, propylene glycol is widely used in food, medicine and cosmetics, and is used to produce tobacco wetting agents, small animal foods, polymer plasticizers and special plasticizers. Recently, it has developed new applications for liquid detergents. [0003] In recent years, with the shortage of energy in the world, the biodiesel industry has developed rapidly. The process of preparing biodiesel produces a large amount of by-product glyc...

AI Technical Summary

Problems solved by technology

Under the condition that the temperature is higher than 200°C and the pressure is higher than 20MPa, this method can obtain 1,2-propanediol in high yield, but the reaction conditions are harsh and the catalyst system is complex

[0007] Chinese patent CN 1061968C describes a method for preparing 1,2-propanediol by catalytic hydrogenolysis of glycerol under high temperature and high pressure. Using a catalyst containing metal cobalt, copper, molybdenum and manganese, the yield of 1,2-propanediol can be as high as 95%, but the reaction pressure is 20~32MPa, higher pressure will lead to higher investment cost of the device and greater difficulty in operation

[0012] 3. Catalysts containing metal cobalt, copper, molybdenum and manganese, the reaction pressure is as high as 20~32MPa, and the higher pressure leads to higher investment cost and more difficult operation of the device

[0013] 4. Using Cu-based catalysts and using gas-phase glycerin feed requires a higher ratio of hydrogen to glycerin, resulting in higher energy consumption and high raw material costs

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