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Method for preparing 1,2-dihydroxypropane by glycerine hydrogenation

A technology for the preparation of propylene glycol and hydrogen, which is applied in the preparation of eliminating hydroxyl groups, chemical instruments and methods, and preparation by reduction of oxygen-containing functional groups, and can solve the problems of complex processes and low product yields.

Active Publication Date: 2007-12-12
SHANGHAI HUAYI NEW MATERIAL
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  • Description
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  • Application Information

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Problems solved by technology

Chinese patent CN 1053176C provides a method for producing acrolein by dehydration of glycerin, and rehydration and hydrogenation of acrolein to produce 1,3-propanediol and 1,2-propanediol. The yield of 1,3-propanediol is 60%, and the yield of 1,2-propanediol Yield 10%, this method process is complicated, and product yield is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7

[0011] In a 500 milliliter stainless steel high-pressure stirred reactor, add 300 grams of glycerin or glycerol solution and a certain amount of catalysts that have been reduced with hydrogen for 4 hours at 300 ° C respectively (the non-oxygen element composition of the catalyst is 28% Cu-47% Co-25% Al), then heat up to 80°C and feed hydrogen, control the reaction pressure to 0.1-10MPa, the reaction temperature to 180-280°C, the stirring speed to 500-2000 rpm, and react for 6 hours. The specific reaction conditions and reaction results in Examples 1-7 are shown in Table 1, and the following percentages are all mass percentages.

[0012] Table 1. Reaction conditions and results of batch hydrogenation of various glycerin raw materials to 1,2-propanediol

[0013]

Embodiment 8～16

[0015] Put 50 grams of the catalyst into a fixed-bed tubular reactor, and reduce it with hydrogen at 300°C for 4 hours. After the reduction, the temperature is lowered to the reaction temperature, and the glycerin aqueous solution with a mass fraction of 80% and hydrogen are mixed and preheated and then enter the reactor for reaction. Liquid mass space velocity 2.0h -1 , hydrogen / glycerol molar ratio 10:1. The reaction product was analyzed by gas chromatography. The specific reaction temperature and pressure and the reaction results in Examples 8-16 are shown in Table 2.

[0016] Table 2. Catalyst, reaction conditions and results of continuous hydrogenation of glycerol in fixed bed to 1,2-propanediol

[0017] Example

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Abstract

The invention provides a method for preparing 1, 2- methyl glycol through glycerin hydrogenation. The glycerin, diluted glycerin or side product coarse glycerin of biodiesel mixes with hydrogen gas or hydrogen gas- containing gas, and reacts under catalyst action to produce 1, 2- methyl glycol. The conversion rate is high.

Description

technical field [0001] The invention relates to a method for preparing 1,2-propanediol (PG) by hydrogenation of glycerol, in particular to a catalyst for preparing PG by hydrogenation of glycerin, solvent-diluted glycerin or biodiesel by-product crude glycerol and a reaction process thereof. Background technique [0002] PG is mainly used to produce unsaturated polyester resin (UPR) for surface coatings and glass fiber reinforcement. Its second largest use is as an antifreeze, replacing ethylene glycol in antifreeze aircraft and as a coolant in food. Additional uses are in the production of plasticizers and hydraulic brake fluids, it is also used in non-ionic detergents and as a humectant in the pharmaceutical, cosmetic, animal food and tobacco industries. In addition, PG is a solvent with good performance, which can be used in printing ink and epoxy resin, etc. At present, PG is mainly produced industrially by hydration of propylene oxide. [0003] There are some patent ...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/132C07C29/60B01J23/80B01J23/72B01J23/75
Inventor 宁春利张春雷刘汉勇焦昆张猛邵敬铭
Owner SHANGHAI HUAYI NEW MATERIAL
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