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Method for hydrogenolysis catalysis of glycerin

A technology that catalyzes the hydrogenolysis of glycerol, applied in chemical instruments and methods, preparation of organic compounds, catalysts for physical/chemical processes, etc., can solve problems that do not conform to the development direction of green chemical industry, complex methods and processes, and harmful to human health, etc., to achieve Good catalytic activity and stability, simple process requirements, and low environmental pollution

Inactive Publication Date: 2010-12-01
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existence of chromium element is easy to cause environmental pollution, harmful to human health, and does not conform to the development direction of green chemical industry
Chinese patent CN 1053176C provides a method for preparing acrolein by dehydration of glycerin, and rehydration and hydrogenation of acrolein to prepare propylene glycol. The process of this method is complicated and the product yield is low

Method used

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  • Method for hydrogenolysis catalysis of glycerin
  • Method for hydrogenolysis catalysis of glycerin
  • Method for hydrogenolysis catalysis of glycerin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Catalyst preparation:

[0015] The Cu-Zn-Ti (1:2:1) catalyst was prepared by co-precipitation method: according to the composition requirements of the catalyst, the corresponding amount of raw material Cu(NO 3 ) 2 ·3H 2 O, Zn(NO 3 ) 2 ·6H 2 O and TiCl 4 Mix, add appropriate amount of water to dissolve and stir evenly. Then use two constant flow pumps to add the above mixed solution and a sufficient amount of saturated sodium carbonate solution to a beaker at a constant temperature of 75°C. Maintain sufficient stirring and adjust the flow rate of the constant flow pump to keep the pH of the reaction solution between 8 and 8.5 to form a co-precipitation mixture. After the precipitation is complete, age overnight. The resulting precipitate was washed, decanted, suction filtered, and distilled water was used repeatedly until the conductivity was less than 2mS / m. The samples were dried at 120°C for 12h and calcined at 450°C for 2h to make the catalyst precursor. Th...

Embodiment 2

[0025] With embodiment 1, but change the ratio of Cu-Zn-Ti in the catalyst to be respectively 1: 2: 2, 2: 2: 1, 2: 2: 2, 1: 0: 1, the obtained results are shown in Table 2 respectively, table 3, Table 4, Table 5.

[0026] Table 2 Under normal pressure, the product selectivity and the conversion rate of raw material glycerol of Cu-Zn-Ti (1:2:2) gas-phase catalytic hydrogenolysis reaction of glycerol at different reaction temperatures

[0027]

[0028] Table 3 Under normal pressure, the product selectivity and the conversion rate of raw material glycerol in the gas phase catalytic hydrogenolysis of Cu-Zn-Ti (2:2:1) at different reaction temperatures

[0029]

[0030] Table 4 Atmospheric pressure, Cu-Zn-Ti (2:2:2) gas-phase catalytic hydrogenolysis reaction product selectivity of glycerol and conversion rate of raw material glycerol at different reaction temperatures

[0031]

[0032] Table 5 Under normal pressure, product selectivity and conversion rate of raw material...

Embodiment 3

[0040] With embodiment 1, but use raw material Zr(NO 3 ) 4 ·5H 2 O instead of TiCl 4 , to prepare Cu-Zn-Zr catalyst, and use this catalyst to catalyze the gas-phase hydrogenolysis reaction of glycerol. The results are shown in Table 6.

[0041] Table 6 Under normal pressure, the product selectivity and the conversion rate of raw material glycerol in the gas-phase catalytic hydrogenolysis of Cu-Zn-Ti (1:2:1) at different reaction temperatures

[0042]

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PUM

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Abstract

The invention discloses a method for the hydrogenolysis catalysis of glycerin, in which an atmospheric fixed bed reactor is adopted for reaction and which is characterized in that Cu-Zn-Ti or Cu-Zn-Zr with different elemental proportions is used as catalyst to catalyze glycerin at normal atmosphere between 240 DEG C to 300 DEG C to achieve hydrogenolysis at gas phase, and hydroxyacetone, ethyleneglycol and propylene glycol products are selectively prepared. The method, having the advantages of high catalyst activity, high conversion rate of glycerin, good product selectivity, mild reaction conditions, small environmental pollution and the like, provides a new effectual way of the hydrogenolysis catalysis of glycerin, thereby effectively solving the problems in the prior art.

Description

technical field [0001] The invention relates to a method for catalyzing the hydrogenolysis of glycerol, in particular to Cu-Zn-Ti or Cu-Zn-Zr catalysts composed of different proportions, under normal pressure, between 240°C and 300°C, to catalyze the gas-phase continuous hydrogenation of glycerin Solution, a method for selectively preparing products including hydroxyacetone, ethylene glycol, propylene glycol, etc. Background technique [0002] Due to the rapid development of the biodiesel industry in recent years, glycerol is produced in large quantities as a by-product in the production process. Rational use of these excess glycerol will help increase the economic benefits of the entire biodiesel industry. The main products of catalytic hydrogenolysis of glycerol are hydroxyacetone, ethylene glycol, and propylene glycol, which are important chemical basic raw materials. For example, hydroxyacetone is a raw material for the preparation of acrylic resin and an important inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/17C07C45/52C07C31/20C07C29/60B01J23/80
CPCY02P20/52
Inventor 冯永海殷恒波陈维广曹建翠张运生卢章准
Owner JIANGSU UNIV
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