Method for preparing acrylic aldehyde by catalytic conversion of glycerin

A technology for catalytic conversion and acrolein, which is applied to the preparation of carbon-based compounds, chemical instruments and methods, and the preparation of organic compounds. It can solve the problems of low yield and high temperature requirements, and achieve the effect of easy separation of products

Active Publication Date: 2017-09-08
TAIYUAN INST OF TECH
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of high temperature requirement and low yield in the existing acr...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Glycerol and γ-butyrolactone are formulated into 100g of a solution with a concentration of 10wt%, add 1g of concentrated phosphoric acid, heat to a reaction temperature of 150°C, collect and condense acrolein, the yield is 90mol%, the product content is 95wt%, and the impurity is water.

Embodiment 2

[0019] Glycerin and gamma-valerolactone were formulated into 100 g of a solution with a concentration of 15 wt%, and 5 g of 20 wt% sulfuric acid was added, heated to a reaction temperature of 160°C, and the condensed acrolein was collected. The yield was 92 mol%, and the product content was 92 wt%. The impurity is water.

Embodiment 3

[0021] Glycerin and gamma-butyrolactone are formulated into 100g of a solution with a concentration of 20wt%, and 2g of 30wt% sulfuric acid is added, heated to a reaction temperature of 170°C, and the condensed acrolein is collected. The yield is 95mol%, and the product content is 91wt%. The impurity is water.

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Abstract

The invention relates to a method for preparing acrylic aldehyde, and particularly discloses a method for preparing acrylic aldehyde by catalytic conversion of glycerin. The technical problems of high temperature requirement and low yield of a conventional acrylic aldehyde preparation method are solved. The method for preparing the acrylic aldehyde by catalytic conversion of the glycerin comprises the following steps: (1) preparing a 10 to 20 weight percent solution from the glycerin and an inert organic solvent, and then adding a catalyst to prepare a reaction system, the addition of the catalyst being 1 to 5 weight percent of the solution prepared from the glycerin and the inert organic solvent; (2) enabling the reaction system to perform reaction at 150 to 180 DEG C, and condensing and collecting generated acrylic aldehyde until no acrylic aldehyde is generated from the reaction system. According to the method, another solvent which is low in viscosity and has an inert chemical property is added into the reaction system, so that the viscosity of the system can be reduced, the diffusion rate of the acrylic aldehyde can be increased, meanwhile, the concentration of the glycerin can be diluted, the concentration of hydroxyl in the system can be reduced, the reaction probability of the acrylic aldehyde can be reduced, and the selectivity of the acrylic aldehyde can further be improved.

Description

technical field [0001] The invention relates to a method for preparing acrolein, in particular to a method for preparing acrolein by catalytic conversion of glycerin. Background technique [0002] Acrolein is an important chemical raw material, which can be catalyzed to produce 1,3-propanediol, acrylic acid and other chemicals. At present, acrylic acid is mainly produced by petrochemical route, but the process of this route is complex and requires different catalytic reaction systems, which is not only costly, but also brings serious environmental pollution. Glycerol is a by-product of the biodiesel production process, the output is huge, and there is no suitable use to digest the glycerol reserves brought by biodiesel production. The production of acrolein from glycerol has important economic value and social significance. [0003] At present, the technology of converting glycerin into acrolein is mainly carried out through acid-catalyzed dehydration. In summary, it can b...

Claims

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Application Information

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IPC IPC(8): C07C45/52C07C47/22
CPCC07C45/52C07C47/22
Inventor 张郃邓天昇冯伟程雪松陈志敏高松平
Owner TAIYUAN INST OF TECH
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