Extractive distillation method of butadiene

A technology of extractive distillation and butadiene, applied in the direction of distillation purification/separation, organic chemistry, etc., to achieve the effects of reducing the amount of extractant, saving energy consumption, and saving costs

Active Publication Date: 2014-12-31
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] In order to solve the problems of high energy consumption, large solvent circulation, and large butadiene loss in the extractive distillation part of the existing butadiene extraction process, the present invention provides a butadiene extractive distillation device, Using the high gravity extractive distillation technology and applying it to the butadiene extractive distillation process can effectively solve the above-mentioned problems in the tower extractive distillation unit in the existing two-stage extractive distillation process

Method used

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  • Extractive distillation method of butadiene
  • Extractive distillation method of butadiene

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Experimental program
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Embodiment

[0044] With DMF extractant,

[0045] Gas-phase carbon four raw materials (mainly composed of n-butane 4.89%, isobutane 2.76%, n-butene 13.42%, isobutene 13.65%, trans-2-butene 5.76%, cis-2-butene 6.04%, 1,3 -butadiene 48.02%, 1,2-butadiene 2.38%, methyl acetylene 0.21%, ethyl acetylene 1.13%, vinyl acetylene 1.59%, carbon five and above heavy components 0.06%) first enter the supergravity extraction The first stage of the distillation unit, the butane and butene components are removed from the gas outlet of the high-gravity rectification section, and the solvent-rich liquid containing butadiene after extractive distillation is extracted from the extractive distillation unit and enters the first stripping unit T- 102 resolves the C4 fraction.

[0046] The reflux ratio of controlling extractive distillation is 1.1, and solvent ratio is 7: 1, and (one section of supergravity extractive distillation device) plate number is 220, and operating pressure is 0.38MPa, and the temperatu...

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Abstract

The invention discloses an extractive distillation method of butadiene. In the method, a hypergravity extractive distillation device is adopted for extractive distillation against first-stage extractive distillation and second-stage extractive distillation; and the hypergravity extractive distillation device comprises a hypergravity distillation section, a hypergravity stripping section and a solvent recovery section, and the hypergravity distillation section, the hypergravity stripping section and the solvent recovery section are completed by a hypergravity machine. According to the method disclosed by the invention, the equipment efficiency is improved and the cost is reduced.

Description

technical field [0001] The present invention relates to the field of chemical industry, and furthermore, relates to a butadiene extraction and rectification method, that is, the extraction and rectification unit in the traditional butadiene extraction process is optimized and upgraded by adopting the high-gravity extraction and rectification technology. Background technique [0002] Butadiene is an important raw material for the production of synthetic rubber, synthetic resin, adiponitrile, hexamethylenediamine, nylon 66, sulfolane, 1,4-butanediol and other organic chemical products. At present, butadiene in the world mainly comes from the by-product C4 fraction of ethylene cracking, which contains butadiene, butene, butane, butyne, vinyl acetylene, propyne and other hydrocarbons. High-purity butadiene is separated by extractive distillation-based extraction process. At present, the three most common butadiene extraction processes in the industry are the N-methylpyrrolidone...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/167C07C7/08
Inventor 李文铭李振虎张文胜曾东
Owner CHINA PETROLEUM & CHEM CORP
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