Process for preparing 1,2-propylene glycol from biological glycerol through low-temperature and low-pressure hydrogenation

A low-temperature, low-pressure, propylene glycol technology, applied in the chemical industry, can solve problems such as harsh reaction conditions and complex production processes, and achieve the effects of fast reaction rate, easy operation, high selectivity and yield

Inactive Publication Date: 2012-04-04
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of harsh reaction conditions and complex production process in the prior art, and provide a new process for preparing 1,2-propanediol by low-temperature and low-pressure hydrogenation of biological glycerol

Method used

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  • Process for preparing 1,2-propylene glycol from biological glycerol through low-temperature and low-pressure hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0019] Add 15ml Cu-SiO to fixed bed reactors A and B respectively 2 Catalyst, glycerol-water solution at the feed rate of 20g / h, hydrogen at 1200h -1 The space velocity first enters reactor A to complete the first step reaction, and then enters reactor B to complete the second step reaction. The weight ratio of glycerol to water in the raw material solution is 1-4. Both A and B reactors have a reaction temperature of 185°C. The A reactor is at normal pressure, and the B reactor has a reaction pressure of 0.5 MPa. After 5 hours of starting the reaction, samples were taken in the B reactor and analyzed by gas chromatography. The results are shown in Table 1:

[0020] Table 1

[0021] .

Embodiment 5～8

[0023] Add 15ml Cu-SiO to fixed bed reactors A and B respectively 2 Catalyst, glycerol-water solution at the feed rate of 20g / h, hydrogen at 800~14000h -1 The space velocity first enters reactor A to complete the first step reaction, and then enters reactor B to complete the second step reaction. The weight ratio of glycerol to water in the raw material solution was 3. Both A and B reactors have a reaction temperature of 185°C. The A reactor is at normal pressure, and the B reactor has a reaction pressure of 0.5MPa. After 5 hours of starting the reaction, samples were taken in B reactor, and analyzed by gas chromatography. The results are shown in Table 2:

[0024] Table 2

[0025] .

Embodiment 9～15

[0027] Add 15ml Cu-SiO to fixed bed reactors A and B respectively 2 Catalyst, glycerol-water solution at the feed rate of 20g / h, hydrogen at 1000h -1 The space velocity first enters reactor A to complete the first step reaction, and then enters reactor B to complete the second step reaction. The weight ratio of glycerol to water in the raw material solution was 3. The reaction temperature of A and B reactors are both 160-190°C, the A reactor is at normal pressure, and the B reactor has a reaction pressure of 0.3-0.8 MPa. After 5 hours of starting the reaction, samples are taken in B reactor and analyzed by gas chromatography. The results are shown in the table. 3:

[0028] table 3

[0029] .

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Abstract

The invention discloses a new process for preparing 1,2-propylene glycol from biological glycerol through low-temperature and low-pressure hydrogenation. In the method, the biologically prepared glycerol is used as a raw material, Cu-SiO2 catalyst is adopted, and the 1,2-propylene glycol is catalytically prepared under extremely mild reaction conditions in two hydrogenation steps, wherein during reaction of the first step, the glycerol is dehydrated under the action of the catalyst to generate an intermediate product acetol; and during the reaction of the second step, the acetol is hydrogenated under the action of the catalyst to generate the 1,2-propylene glycol. The process has the advantages of easiness and convenience in reaction process, easiness in operation, high controllability, low reaction temperature, low reaction pressure, high target product yield and the like.

Description

technical field [0001] The invention relates to a process for preparing 1,2-propanediol by low-temperature and low-pressure hydrogenation of biological glycerol, which belongs to the technical field of chemical industry. Background technique [0002] 1,2-Propanediol is a colorless, odorless, slightly viscous, low-toxic, hygroscopic liquid that is widely used in the food and pharmaceutical industries. 1,2-propanediol can also be used as antifreeze and heat carrier, and at the same time, it is the raw material for making unsaturated polyester resin, plasticizer, surfactant and emulsifier, etc. Generally speaking, it is a bulk chemical product with a wide range of uses . The traditional production technology in our country is to use propylene oxide as the raw material through hydration, or to generate dimethyl carbonate by-product to obtain propylene glycol through transesterification of propylene carbonate. The above two processes use propylene from petroleum routes as raw m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/145
Inventor 朱小学刘芃叶秋云李南锌郑敏王华
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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