Method of continuously preparing 1,2-dihydroxypropane by glycerin catalytic hydrogenation

A technology for catalytic hydrogenation and propylene glycol, applied in the preparation of hydroxyl groups, organic chemistry, etc., can solve problems such as harmful human health and environmental pollution, and achieve the effects of less by-products, simplified process requirements, and mild conditions.

Inactive Publication Date: 2007-08-08
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the presence of chromium can easily cause environmental pollution and be harmful to human health.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A tubular fixed-bed catalytic hydrogenation reactor with a diameter of 60 cm and an inner diameter of 12 mm was used in the test.

[0016] The catalyst is a composite oxide of copper, zinc and manganese, and the weight ratio of the three metal elements is:

[0017] Copper:zinc:manganese=31.5:47.6:1.

[0018] The catalyst was reductively activated by hydrogen at 250°C for 3 hours.

[0019] In the isothermal zone of the reactor, 2 grams of activated catalyst with a particle size of 20-40 meshes are installed.

[0020] The gas addition reaction raw materials are 85% glycerol aqueous solution and hydrogen, and the feeding conditions are:

[0021] Hydrogen / glycerol volume ratio: 1200; glycerin volume space velocity: 1.6h -1 .

[0022] The reaction conditions are:

[0023] Pressure: 3MPa; Temperature: 210°C.

[0024] The raw materials glycerin and hydrogen are continuously input from the upper inlet of the tubular reactor. After the catalytic hydrogenation reaction, the...

Embodiment 2

[0027] In this example, the volumetric space velocity of glycerin is 2.3h -1 , The hydrogen / glycerol volume ratio is 800.

[0028] Reaction temperature, pressure, catalyst component and other conditions are all with embodiment 1.

[0029] The liquid phase product of the reaction is analyzed by chromatography, and the conversion rate of glycerin is more than about 83%, and the selectivity of the main reaction product 1,2-propanediol is 95%.

[0030] Compared with Example 1, this example shows that the volumetric space velocity of glycerol increases, the hydrogen / glycerin volume ratio decreases, and the conversion rate of glycerol decreases.

Embodiment 3

[0032] Except that reaction temperature adopts 220 ℃, other conditions are all identical with embodiment 1.

[0033] The liquid phase product of the reaction is analyzed by chromatography to show that the conversion rate of glycerol is greater than 99%, and the selectivity of the main reaction product 1,2-propanediol reaches 94.5%.

[0034] Compared with Example 1, this example shows that the reaction temperature increases, and the conversion rate of glycerol is increased.

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PUM

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Abstract

The invention discloses a making method of 1, 2-propanediol under mild condition, which is characterized by the following: adopting copper, zinc and manganese and or aluminium catalyst; aerating glycerin and hydrogen continuously from the top of reactor; hydrogenating glycerin at 200-250 deg.c under 2.5-5Mpa; outputting and collecting reacting product from the bottom of reactor continuously; separating gas; returning to recycle; setting the weight rate of metal element of catalyst at 16-48:24-48:0.15-4:0-8.

Description

technical field [0001] The invention relates to a method for continuously preparing 1,2-propanediol by catalytic hydrogenation of glycerin. Background technique [0002] 1,2-propanediol is an important chemical basic raw material, such as in unsaturated polyester resin (used in surface coating and glass fiber reinforced resin), functional fluid (antifreeze, heat transfer fluid), food, medicine and cosmetics, liquid It has a wide range of uses in the fields of detergents, paints and coatings. The traditional raw material for the production of propylene glycol is mainly derived from petroleum propylene oxide, its price fluctuates greatly with the price of petroleum, and its cost is high. At present, the research on the preparation of 1,2-propanediol by catalytic hydrogenation using glycerol as raw material has been reported. In recent years, in order to get rid of the excessive dependence on petroleum, more biodiesel plants have been put into operation, and glycerol, as a by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/60C07C31/20
Inventor 陈长林徐南平杜智群李迎宾
Owner NANJING TECH UNIV
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