Method for concentrating butane through catalysis and isomerization
A technology for catalyzing isomerization of butenes and butenes by C4 is applied in the fields of isomerization to hydrocarbon production, chemical industry, organic chemistry, etc. It can solve the problems of high energy consumption, waste water production, long process flow, etc. Investment, the effect of reducing coking
Active Publication Date: 2014-05-07
山东海成石化工程设计有限公司
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[0005] The invention relates to a method for enriching isomeric butene with mixed carbon four catalysts, which mainly solves the technical problems of long process flow, high energy consumption and waste water production in the existing extraction and rectification butene enrichment method
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[0021] The present invention will be further described below in conjunction with accompanying drawing.
[0022] Such as figure 1 As shown, the raw material mixed with C4 and hydrogen enters the reactor 1, and the unsaturated olefins are selectively hydrogenated into n-butenes, and the conversion rate is about 100%. At the same time, more than 50% of the butene-1 double bond isomerized to a higher boiling point butene-2; the reaction product enters the middle part of the catalytic separation tower 2, and its rectification section includes a catalyst section, butene-1 undergoes deep double bond isomerization through catalytic rectification, and more than 90% of butene-1 is converted into butene-2 , so that isobutane is easily separated from the top of the catalytic separation tower; the non-condensable steam in the reflux tank 3 is rich in hydrogen, mixed with fresh hydrogen, compressed by the compressor 4, and then recycled, part of it enters the reactor 1, and part of it enter...
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The invention relates to a method for concentrating butane by catalyzing and isomerizing mixed butane, and mainly solves the technical problems that the conventional concentrating method of extracting and rectifying butene is long in process, high in energy consumption and more in waste water. The method adopts the main technical scheme that a mixed butane raw material enters a reactor, unsaturated alkenes such as butadiene are subjected to selective hydrogenation to be transformed into n-butene, meanwhile most butene-1 with a low boiling point is subjected to double bond isomerism into butene-2 with a higher boiling point, the product enters a catalyzing and separating tower, catalytic distillation is performed in the catalyzing and separating tower, the butene-1 is further subjected to double bond hydroisomerization, so that isobutane can be separated from the top of the tower relatively easily, and refined butane with high butene concentration can be obtained from the bottom of the tower. Compared with the conventional extraction separation method, the method for concentrating butane through catalysis and isomerization has the advantages of short process, low investment, low energy consumption, no waste water, less butene loss, high reliability and easiness in operation, and is suitable for a project for splitting the mixed butane to isomerize propylene and butene frameworks to prepare isobutene and other projects in which high butene butane is required to be used as the raw material.
Description
technical field [0001] The invention relates to a method for enriching butene with mixed C4 catalytic isomerization, mainly aimed at projects such as C4 cracking to produce propylene and butene skeletal isomerization to produce isobutene, which require refining with low impurities and high butene content Carbon four as raw material. Background technique [0002] The difference between the boiling point of butene-1 and isobutane is 5.5°C. The separation of the two through ordinary rectification requires high energy consumption and a large number of trays. The current butene concentration technology mainly adopts the method of extractive rectification. The process is that the C4 raw material enters the butane tower after the light components are removed by the third decarburization tower. The solvent is recycled, and butene and butane contain a small amount of extractant, and the qualified products butene and butane are obtained after being washed by a water washing tower res...
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IPC IPC(8): C07C11/09C07C5/25C07C7/04
CPCY02P20/10
Inventor 王春生冯玉坤袁树成林祥钦陈敬斋
Owner 山东海成石化工程设计有限公司