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Method for preparing 1,3-butadiene through catalytic dehydrogenation of butane

A technology for catalytic dehydrogenation and butadiene, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve problems such as uncontrollable production volume, achieve low production cost, stable quality, good use of cooling capacity and heat effect

Inactive Publication Date: 2012-04-18
TIANJIN TAIHENG GASES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method must mainly be co-produced with ethylene, which is greatly affected by the production volume of the main product ethylene and other products, and cannot control the production volume

Method used

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  • Method for preparing 1,3-butadiene through catalytic dehydrogenation of butane
  • Method for preparing 1,3-butadiene through catalytic dehydrogenation of butane
  • Method for preparing 1,3-butadiene through catalytic dehydrogenation of butane

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Effect test

Embodiment 1

[0028] Adopt butane catalytic dehydrogenation to prepare the method for 1,3-butadiene:

[0029] (1) In a reactor, catalyst 18% chromium oxide is impregnated on alumina, then butane (98%) is dehydrogenated to butene, and butene is dehydrogenated to 1,3-butadiene; reaction The temperature is 550°C, the pressure is 0.0946kPa (absolute pressure), and the space velocity is 1h-1 (volume); the weight ratio of butane to catalyst is 1:0.5.

[0030] (2) It comes out of the reactor and is directly cooled by circulating cooling oil in the quenching tower, and then compressed and sent to the absorption-stabilization system. The separated mixture of butene and 1,3-butadiene is extracted and distilled with acetonitrile or furfural to separate polymer grade 1,3-butadiene. The single-pass conversion rate of butane in the process is only 30%, the selectivity is 65%, and the total yield is 63%.

Embodiment 2

[0032] (1) In a reactor, use catalyst 20% chromium oxide to impregnate alumina, then dehydrogenate butane to butene, and dehydrogenate butene to generate 1,3-butadiene; the reaction temperature is 650°C , the pressure is 0.379kPa (absolute pressure), the space velocity is 3h-1 (volume); the ratio of butane to catalyst by weight is 1:0.8.

[0033] (2) Come out of the reactor and directly contact with circulating cooling oil in the quenching tower for cooling, and then send it to the absorption-stabilization system through compression; Parts ratio is 1:1) Extractive distillation to separate polymer grade 1,3-butadiene .

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Abstract

The invention discloses a method for preparing 1,3-butadiene through catalytic dehydrogenation of butane. Two products, namely butene and 1,3-butadiene are obtained in the dehydrogenation process of the butane; and the reaction is also strong endothermic reaction and is carried out at the temperature of more than 500 DEG C under lower partial pressure of the butane in the presence of a catalyst. The reaction temperature of an industrial device for dehydrogenating the butane is about 600 DEG C; and the lower conversion per pass is maintained by shortening the contact time.

Description

technical field [0001] The invention relates to an alkane chemical product, in particular to a method for preparing 1,3-butadiene by catalytic dehydrogenation of butane, which is suitable for chemical synthesis of 1,3-butadiene . Background technique [0002] The internal rotation of the C-C single bond in the butadiene molecule is divided into cis and trans configurations. The trans configuration is stable for the molecule. The product is a colorless gas with a faint aromatic odor and is easily liquefied. Melting point -108.9°C, boiling point -4.41°C, relative density 0.6211 (20 / 4°C), freezing point -108.91°C, flash point <-6°C, refractive index 1.4292 (25°C), critical temperature 152°C, critical pressure 4326.58kPa, The critical density is 0.245g / cm3. Form explosive mixture with air, explosion limit 2%-11.5% (vol). Soluble in alcohol and ether, also soluble in acetone, benzene, dichloroethane, amyl acetate and furfural, cupric ammonia solution. Insoluble in wate...

Claims

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Application Information

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IPC IPC(8): C07C11/167C07C5/333
Inventor 李中元
Owner TIANJIN TAIHENG GASES
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