Method for separating 1-butylene

A technology of butene and absorption tower, applied in the field of separating 1-butene, can solve the problems of high energy consumption and high cost, and achieve the effects of less investment in equipment, low production cost, and reduced energy consumption

CN102040449AInactive Publication Date: 2011-05-04CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-05-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for separating 1-butylen, which comprises three steps including absorption, extraction and rectification. At first, an absorption solution containing soluble silver salt is in contact with feed gas containing C4 olefin in an absorption column to selectively absorb 1-butylen and cis-2-butene, the absorption solution containing the 1-butylen and the cis-2-butene is leaded out from the column bottom of the absorption column to enter an extraction column from the top of the extraction column, and an extracting agent enters into the extraction column from the bottom of the extraction column to extract the absorbed 1-butylen and cis-2-butene out in the extraction column. An extraction solution containing the 1-butylen and the cis-2-butene obtained at the top of the extraction column is rectified and separated in a rectifying column to obtain high purity 1-butylen product from the top of the extraction column, products containing cis-2-butene from the middle-lower part of the extraction column and extraction liquid from the bottom of the extraction column. The method for separating 1-butylen has advantages of high yield of 1-butylen and low energy consumption, and is easy to popularize and apply.
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Description

technical field

[0001] The present invention relates to a kind of method of separating 1-butene, more specifically, relate to a kind of method adopting absorption, extraction, rectification operation to separate 1-butene. Background technique

[0002] Butene is the most important basic petrochemical raw material besides ethylene and propylene. There are four isomers of butene, namely 1-butene, cis-2-butene, trans-2-butene, and isobutene, all of which come from catalytic cracking in refineries, petroleum cracking and C in natural gas. 4 fraction. Among them, 1-butene is a comonomer of linear low-density polyethylene (LLDPE) and high-density polyethylene (HDPE), and poly-1-butene is one of the petrochemical products with a rapid growth rate in recent years. Depending on the application, the requirements for the purity of 1-butene are also different. In general, the purity of 1-butene is about 95% to 99.5%.

[0003] High-purity 1-butene can be produced by ethylene dimerizati...

Examples

Embodiment 1

[0044] Feed gas (see Table 1 for components and their content) enters the stainless steel packed tower with a tower diameter of 20mm and 29 trays from the bottom of the tower at a flow rate of 1429ml / hr. The absorbing liquid is an aqueous solution of silver nitrate, silver nitrate solution The mass percent concentration is 30%, enters the absorption tower from the top of the tower at a flow rate of 50ml / hr, the temperature in the tower is 26°C, the pressure is 0.1MPa, the tail gas is released from the top of the tower, and the absorption liquid flows out from the tower kettle;

[0045] 60 g / hr of the absorption liquid flowing out from the absorption tower tank is introduced into the upper part of the extraction tank, and 110 g / hr of extractant n-hexane is introduced from the upper part of the extraction tank, the temperature of the extraction tower is 28 ° C, and the pressure is 0.1 MPa;

[0046] The gas analyzed from the extract liquid that flows out from the top of the extrac...

Embodiment 2

[0049] Feed gas (see Table 1 for components and their content) enters the stainless steel packed tower with a tower diameter of 20mm and 29 trays from the bottom of the tower at a flow rate of 1429ml / hr. The absorbing liquid is an aqueous solution of silver nitrate, silver nitrate solution The mass percent concentration is 30%, enters the absorption tower from the top of the tower at a flow rate of 50ml / hr, the temperature in the tower is 26°C, the pressure is 0.1MPa, the tail gas is released from the top of the tower, and the absorption liquid flows out from the tower kettle;

[0050] 60 g / hr of the absorption liquid flowing out from the absorption tower tank is introduced into the upper part of the extraction tank, and 60 g / hr of extractant n-heptane is introduced from the upper part of the extraction tank, the temperature of the extraction tower is 28 ° C, and the pressure is 0.1 MPa;

[0051] The gas analyzed from the extract liquid that flows out from the top of the extrac...