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A method for improving the yield of raffinate product in dmf method 1,3-butadiene extraction device

An extraction device and a technology for butadiene are applied in the field of improving the yield of the raffinate product of the 1,3-butadiene extraction device of the DMF method, and can solve the problems of reducing the economic benefits of the butadiene device and the downstream device, and the like, To achieve the effect of reducing concentration, improving economic efficiency and improving operational safety

Active Publication Date: 2015-12-09
SINOPEC ENG +1
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Problems solved by technology

With the continuous expansion of the scale of the new 1,3-butadiene extraction unit, the loss of its raffinate product is more obvious, which reduces the economic benefits of the butadiene unit and downstream units

Method used

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  • A method for improving the yield of raffinate product in dmf method 1,3-butadiene extraction device

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Embodiment

[0020] Such as figure 1 as shown,

[0021] Dissolved with C 4 The DMF solvent of alkyne enters the middle part of the second stripper, and introduces the remaining C of a MTBE / butene-1 unit 4 Instead of the raffinate at the top of the first extraction system, it enters the upper part of the second stripper as a dilution gas, and the C containing vinyl acetylene 4 The alkyne gas is stripped out in the second stripping tower, discharged from the reflux tank after cooling, and the remaining C is controlled. 4 flow such that C 4 The concentration of vinyl acetylene in alkyne gas is below 30% (by weight).

[0022] Dissolved with C 4 The DMF solvent of alkyne is 51862kg / h, wherein the concentration of vinyl acetylene is 0.811wt%;

[0023] remaining C 4 It is the C of the butene-1 rectifying tower-I tower still of MTBE / butene-1 device 4 ;

[0024] The second stripper theoretical plate number is 8;

[0025] The temperature of the bottom of the second stripping column is 164°...

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Abstract

The invention discloses a method for improving raffinate product yield of a DMF-process 1,3-butadiene extracting apparatus. The method comprises the following steps: allowing a DMF solvent with dissolved C4 alkyne to enter the central part of a second stripping tower; allowing residual C4 from an MTBE / butylene-1 apparatus to enter the upper part of the second stripping tower as diluent gas; stripping C4 alkyne gas containing vinylacetylene from the second stripping tower; and cooling the C4 alkyne gas and discharging the cooled C4 alkyne gas from the top of a return tank in the form of noncondensable gas; wherein the residual C4 from the MTBE / butylene-1 apparatus is one or more selected from the group consisting of deisobutanizer top gas, deisobutanizer top noncondensable gas and butylene-1 rectifying tower bottom C4. The method provided by the invention enables the raffinate product yield of the butadiene extracting apparatus to be 100%, so economic benefits of a butadiene apparatus and the downstream MTBE / butylene-1 apparatus are improved, the concentration of vinylacetylene in C4 alkyne is further reduced, and security of the butadiene extracting apparatus is enhanced.

Description

technical field [0001] The present invention relates to ethylene cracking C 4 The technical field of fraction separation, more specifically, relates to a method for increasing the yield of the raffinate product of a DMF method 1,3-butadiene extraction device. Background technique [0002] At present, for the mixed C 4 The use of fractions is usually to use polar solvents to extract and rectify them, combined with ordinary rectification to extract 1,3-butadiene components to produce polymer-grade 1,3-butadiene products, respectively It is the DMF method, acetonitrile method and NMP method. The by-product raffinate separated by the 1,3-butadiene extraction device contains a large amount of isobutene and butene-1 components, so the raffinate is generally used as a downstream MTBE / The production raw material of butene-1 plant to produce MTBE and butene-1 products. Among them, in the DMF method 1,3-butadiene extraction device, C 4 The alkynes are stripped out in the second s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/40
Inventor 阮细强高耸侯霞晖丁文有陈钢王春慧陈茂春
Owner SINOPEC ENG
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