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Synthesis of 1,2-butyl ketoaldehyde

A synthesis method and technology of butanediol, applied in 1, can solve the problems of increased reaction bed pressure, decreased catalyst activity, high reaction temperature requirements, etc., and achieves the effects of low reaction temperature, excellent low-temperature catalytic effect, and simple process

Inactive Publication Date: 2006-11-29
FUDAN UNIV
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Problems solved by technology

The problem with this method is that the reaction temperature is high, and the reaction temperature needs to be above 500°C. At the same time, the electrolytic silver catalyst is easy to agglomerate at high temperature, which will lead to a sharp decline in the activity of the catalyst and an increase in the pressure of the reaction bed.

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  • Synthesis of 1,2-butyl ketoaldehyde

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[0021] 1. 80 milligrams adopt the nano-silver zeolite membrane catalyst prepared by lamination layer-electrolysis method to be packed into a diameter in the stainless steel reactor of 10mm, the content of silver nanoparticles in the catalyzer is 14%, is wrapped with the copper net of ultra-thin zeolite membrane The content is 86%. Catalyst is prepared as follows:

[0022] (1) A single layer of nano-sized LTA zeolite is grown on the copper grid by layer-by-layer method, and the molar composition is 80Na by immersing it 2 O:Al 2 o 3 : 9SiO 2 :5000H 2 In the solution of O, stand at 40-80°C for 2-5 hours;

[0023] (2) adopt silver nitrate solution as electrolyte, silver is anode, and the copper mesh that is coated with zeolite membrane is cathode electrolysis, makes silver nano-particle evenly distributed on the zeolite membrane;

[0024] (3) drying the above solid at 100° C. and calcining at 400° C. for 2 hours to obtain a catalyst for synthesizing 1,2-butanone aldehyde by ...

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Abstract

Synthesis of 1,2-butyl keto-aldehyde with nanometer silver zeolite membrane as catalyst by 1,2-butanediol gas-phase dehydrogenation and oxidation is carried out by taking metal net as catalyst skeleton, coating zeolite membrane on metal wire, depositing silver on surface of zeolite membrane by electrolytic process, directly catalyzing 1,2-butanediol by the zeolite silver catalyst, synthesizing 1,2- butyl keto-aldehyde by gas-phase dehydrogenation and oxidation, or modifying one or several element of Ag2O, Zn or Mn. The reacting temperature is 280-380deg.C, the mol ratio of oxygen and 1,2-butanediol is 1.2-3.2, LHSV=1.0-0.8hr-1. The single-pass percent conversion of 1,2-butanediol reaches to 90.4%, and the selectivity of 1,2- butyl keto-aldehyde reaches to 76.9%.

Description

technical field [0001] The invention relates to a method for synthesizing 1,2-butanone aldehyde by catalytic oxidative dehydrogenation of 1,2-butanediol in gas phase. technical background [0002] 1,2-butanone aldehyde (also known as ethylglyoxal) is an intermediate in the synthesis of 1,2-butanuonic acid, and is widely used in the field of biochemistry. [0003] The traditional 1,2-butanone aldehyde manufacturing process uses 1,2-butanediol as a raw material, electrolytic silver as a catalyst, and gas-phase dehydrogenation to produce aceglyoxal. The problem with this method is that the reaction temperature is relatively high, and the reaction temperature needs to be above 500°C. At the same time, because the electrolytic silver catalyst is easy to agglomerate at high temperature, the activity of the catalyst will drop sharply, and the pressure of the reaction bed will increase. When the reaction temperature is higher than 500°C, the raw material is prone to bond breaking a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C49/185C07C45/32
Inventor 徐华龙沈伟唐颐沈江山巍杜俊明
Owner FUDAN UNIV