Method for preparing acrolein by glycerol dehydration

A technology of acrolein and glycerin aqueous solution, applied in chemical instruments and methods, preparation of carbon-based compounds, preparation of organic compounds, etc., can solve problems such as catalyst deactivation, and achieve high catalytic activity, improved yield, and excellent anti-deactivation resistance. performance effect

Active Publication Date: 2018-12-07
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, severe coking is one of the important reasons for catalyst deactivation

Method used

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  • Method for preparing acrolein by glycerol dehydration
  • Method for preparing acrolein by glycerol dehydration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation of the anti-coking hollow ZSM-5 molecular sieve catalyst and its application in the reaction of glycerol dehydration to prepare acrolein comprises the following steps:

[0025] (1) Mix deionized water and NaAlO 2 After mixing and stirring evenly, add tetrapropylammonium hydroxide aqueous solution with a mass fraction of 25%, and obtain a mixed solution after fully stirring; add tetraethyl orthosilicate dropwise to the mixed solution, and stir fully to hydrolyze tetraethyl orthosilicate Completely, put the above mixed solution into a hydrothermal kettle, crystallize at 120°C for 2h, then heat up to 170°C for 3d, centrifuge, wash, dry, and roast to obtain Na-ZSM-5 molecular sieve; among them, deionized water , NaAlO 2 , The molar ratio of tetrapropylammonium hydroxide aqueous solution and tetraethylorthosilicate is: 500:0.5:2:10;

[0026] (2) Put 1g of Na-ZSM-5 molecular sieve into 20mL of 0.1M inorganic alkali aqueous solution, mix and stir evenly, heat...

Embodiment 2

[0032]The preparation of the anti-coking hollow ZSM-5 molecular sieve catalyst and its application in the reaction of glycerol dehydration to prepare acrolein comprises the following steps:

[0033] (1) Mix deionized water and NaAlO 2 After mixing and stirring evenly, add tetrapropylammonium hydroxide aqueous solution with a mass fraction of 25%, and obtain a mixed solution after fully stirring; add tetraethyl orthosilicate dropwise to the mixed solution, and stir fully to hydrolyze tetraethyl orthosilicate Completely, put the above mixed solution into a hydrothermal kettle, crystallize at 120°C for 4h, then raise the temperature to 170°C for 4d, centrifuge, wash, dry, and roast to obtain Na-ZSM-5 molecular sieve; among them, deionized water , NaAlO 2 , The molar ratio of tetrapropylammonium hydroxide aqueous solution and tetraethylorthosilicate is: 1000:0.2:1:10;

[0034] (2) Put 1g of Na-ZSM-5 molecular sieve into 30mL of 0.2M inorganic alkali aqueous solution, mix and sti...

Embodiment 3

[0040] The preparation of the anti-coking hollow ZSM-5 molecular sieve catalyst and its application in the reaction of glycerol dehydration to prepare acrolein comprises the following steps:

[0041] (1) Mix deionized water and NaAlO 2 After mixing and stirring evenly, add tetrapropylammonium hydroxide aqueous solution with a mass fraction of 25%, and obtain a mixed solution after fully stirring; add tetraethyl orthosilicate dropwise to the mixed solution, and stir fully to hydrolyze tetraethyl orthosilicate Completely, put the above mixed solution into a hydrothermal kettle, crystallize at 100°C for 6h, then raise the temperature to 170°C for 3d, centrifuge, wash, dry, and roast to obtain Na-ZSM-5 molecular sieve; among them, deionized water , NaAlO 2 , The molar ratio of tetrapropylammonium hydroxide aqueous solution and tetraethylorthosilicate is: 600:0.25:2.5:10;

[0042] (2) Put 1g of Na-ZSM-5 molecular sieve into 30mL of 0.15M inorganic alkali aqueous solution, mix and...

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Abstract

The invention discloses a method for preparing acrolein by glycerol dehydration catalyzed by a ZSM-5 nanometer molecular sieve with a hollow structure. The method includes the following steps: first preparing a ZSM-molecular sieve, then uniformly mixing and stirring the prepared ZSM-5 molecular sieve with an alkaline substance aqueous solution, performing alkali treatment under stirring at 40-80 DEG C, and preparing the ZSM-5 nanometer molecular sieve with the hollow structure by centrifugal washing, drying, and roasting after the treatment is performed; and finally, preparing the acrolein bythe glycerol dehydration under catalysis of the ZSM-5 nanometer molecular sieve with the hollow structure. In chemical reactions, the prepared ZSM-5 nanometer molecular sieve is beneficial to diffusion of mass transfer of reaction molecules, thereby effectively improving the conversion rate of glycerol and the yield of the acrolein, and the anti-deactivation performance of a catalyst can be effectively improved.

Description

technical field [0001] The invention relates to the field of high-value conversion and utilization of glycerin and the reaction field of glycerin dehydration to acrolein, in particular to the preparation and application of a hollow ZSM-5 molecular sieve anti-deactivation catalyst. Background technique [0002] For more than 150 years, the development of chemical and energy industries has widely relied on fossil resources, such as coal, natural gas, and oil, so that the overexploitation and utilization of fossil resources have caused various global environmental problems. Biomass is an abundant, carbon-neutral renewable resource that can be used in the production of energy and chemicals. In recent years, many studies have devoted themselves to changing the direction from society's dependence on fossil raw materials to the utilization of renewable biomass resources. Among the many applications of biomass, biodiesel has been industrially produced on a large scale. In 2012, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/52C07C47/22B01J29/40
CPCB01J29/40C07C45/52C07C47/22
Inventor 刘立成黄河张峰
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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