Method for producing butadiene

A production method and technology of butadiene, which are applied in extraction and purification/separation, organic chemistry, hydrogenation to hydrocarbons, etc., can solve the problems of uneconomical delight tower, fluctuation of operating pressure of extraction tower, etc., to reduce risks and ease operating conditions. , the effect of reducing the number of theoretical plates

Active Publication Date: 2010-03-10
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] The present invention proposes a new butadiene production process in order to solve the problems of fluctuations in the operating pressure of the extraction tower and uneconomical light removal towers in the existing process of selecting hydrogenation to remove alkyne and extraction to produce butadiene, which can solve the problem of Trouble caused by high concentration of alkynes without affecting the operation of the extraction tower, and at the same time can increase the yield of butadiene

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  • Method for producing butadiene

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Embodiment 1

[0046] The mixed C4 fraction is mixed with 24.58Kmol / h of hydrogen at a flow rate of 819.25Kmol / h, and enters the first-stage hydrogenation reactor. -1 63.11% of the alkynes are hydrogenated into the corresponding alkenes under the condition of Olefins, the remaining alkynes at the outlet of stage II reactor are less than 10ppm. The composition of the mixed C4 fraction is listed in Table 1. The hydrogenation reactors in stage I and stage II are filled with the catalyst disclosed in ZL 00107257.9.

[0047] The C4 fraction after the removal of alkynes enters the evaporator, and enters the extraction tower after gasification. Under the action of the solvent, the gas containing butane, butene, propane, propylene, methane and hydrogen is extracted from the top of the extraction tower, and enters Degassing tower.

[0048] The degassing tower adopts a packed tower structure with a theoretical plate number of 20. Under the conditions of pressure 0.35MPa, tower top temperature -5°C,...

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Abstract

The invention relates to a method for producing butadiene, which belongs to the technical field of alkenes production. In order to solve the problems that the prior process for producing the butadieneby combining selective hydrogenation alkyne removal and extraction has fluctuation operating pressure for an extracting tower and an uneconomic lightness-removing column, the invention discloses a novel process for producing the butadiene. Apart from the adoption of the process flow in combination of selective hydrogenation and extraction processes, the novel process sets a degassing tower at anextraction position on the top of the extracting tower so as to separate out the residual hydrogen and light components with less than four carbons after the hydrogenation reactions. The method can eliminate the adverse factors which influence the operation of the extracting tower in the prior art, avoids butadiene losses while removing the light components, and improves the yield of the butadiene.

Description

technical field [0001] The invention relates to a method for producing butadiene, in particular, the invention relates to a method for producing butadiene by combining selective hydrogenation to remove alkynes from mixed C4 fractions and traditional extraction. Background technique [0002] The industrial production of 1,3-butadiene is usually obtained by cracking mixed C4 fractions as raw materials through two-stage solvent extraction. There are three main processes for solvent extraction: acetonitrile extraction, dimethylformamide extraction and N-methylpyrrolidone extraction. In addition to the different solvents used, the process flow is also slightly different, but the extraction mechanism is the same. The first step is to separate butane, butene from butadiene, and extract butane and butene; the second step is to separate alkynes from butadiene, remove carbon tetrakynes, and then obtain more than 99.7% 1,3-butadiene product. [0003] The cracked mixed carbon four fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/167C07C5/09C07C7/04C07C7/10
Inventor 戴伟乐毅彭晖徐立英廖丽华
Owner CHINA PETROLEUM & CHEM CORP
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