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Method for extracting high-purity 1,3-butadiene by using N-methylpyrrolidone

A technology of methylpyrrolidone and butadiene, applied in the direction of distillation purification/separation, etc., can solve the problems of not being able to obtain high-purity 1.3-butadiene, shortening contact time, and low single-pass conversion rate

Inactive Publication Date: 2012-01-25
天津东方宜信物流有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction temperature of the butane dehydrogenation industrial unit is about 600°C, and 1.3-butadiene can be produced by shortening the contact time to maintain a low single-pass conversion rate, and high-purity 1.3-butadiene cannot be obtained

Method used

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  • Method for extracting high-purity 1,3-butadiene by using N-methylpyrrolidone
  • Method for extracting high-purity 1,3-butadiene by using N-methylpyrrolidone

Examples

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Effect test

Embodiment 1

[0018] 1,3-Butadiene C 4 The distillate undergoes extractive distillation after selective hydrogenation to remove alkynes. The selective hydrogenation process is carried out in the liquid phase. The catalyst used is palladium loaded on alumina, and N-methylpyrrolidone is used as the solvent. It is absorbed twice and rectified twice to obtain a purity of 99.8%-99.9%, and the alkyne content is <50μg / g of polymer grade 1,3-butadiene.

Embodiment 2

[0020] The C4 fraction containing 1,3-butadiene is subjected to one-stage or two-stage extractive distillation by solvent extraction distillation; in the process of one-stage extractive distillation, the alkyne is first separated by ordinary distillation, and then the alkane is separated by extractive distillation And olefins, and then through precise distillation to obtain polymer grade 1,3-butadiene.

Embodiment 3

[0022] The C4 fraction containing 1,3-butadiene is subjected to selective hydrogenation to remove alkynes before extractive distillation; the selective hydrogenation process is carried out in the gas phase, and the catalyst used is loaded on alumina copper oxide; % of acetonitrile as a solvent, extraction and distillation separation of C4 alkanes and olefins, the extraction tower has 120 trays. After precise distillation, polymer grade 1,3-butadiene is obtained.

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Abstract

The invention discloses a technological process for separating and refining high-purity 1,3-butadiene by an N-methylpyrrolidone extractive distillation method. The invention is characterized in that N-methylpyrrolidone containing a small amount of water is used as a solvent to carry out absorption twice and rectification twice, thereby obtaining the polymer-grade 1,3-butadiene. The yield of the product 1,3-butadiene is up to 98.5%, the purity is 99.8-99.9%, and the alkyne content is lower than 50 mu g / g. The method disclosed by the invention has the advantages of reasonable technique and simpleness, and is an ideal technology for purifying 1,3-butadiene.

Description

technical field [0001] The invention relates to an alkane chemical product, in particular to a technique for separating and refining high-purity 1,3-butadiene by means of N-methylpyrrolidone extraction and distillation, 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 furfura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/167C07C7/08
Inventor 梁喜乐
Owner 天津东方宜信物流有限公司
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