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Iso-butane, n-butane and butylene separation and purification method

A purification method, n-butane technology, applied in the direction of distillation purification/separation, organic chemistry, etc., can solve the problems of underutilized value and high energy consumption, and achieve the effect of reducing equipment investment and energy consumption

Inactive Publication Date: 2012-07-25
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The top product of the extractive distillation tower is a mixture of alkanes containing isobutane and n-butane. This mixture is usually burned as liquefied gas, and its value has not been fully utilized. For example, n-butane can produce maleic anhydride, isobutane It can dehydrogenate isobutene, and can also produce propellant or alkylated gasoline. Therefore, the separation of n-butane and isobutane also has a good industrial application prospect. The existing process generally adopts ordinary rectification to separate n-butane and isobutane alkane separation, high energy consumption

Method used

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  • Iso-butane, n-butane and butylene separation and purification method
  • Iso-butane, n-butane and butylene separation and purification method
  • Iso-butane, n-butane and butylene separation and purification method

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Effect test

Embodiment 1

[0052] Embodiment 1 The separation and purification method of isobutane, n-butane and butene of the present invention, technological process can basically refer to attached figure 1 , the mixed carbon four raw material 4 is advanced to the third decarbonization tower 13, the carbon three components are extracted from the top of the three decarbonization towers 14, and the remaining carbon four components are extracted from the decarbonization three tower kettles and then enter the middle part of the decarbonization five tower 17 for decarbonization 18 extracted from the bottom of the C5 tower is C5 components, 19 extracted from the top of the tower is C4 components introduced into the middle of the isobutane tower 1 for feeding, and the circulating solvent 5 of the isobutane tower is fed from the upper part of the isobutane tower 1 The top of the isobutane tower 1 tower obtains isobutane 6, and the extraction product 7 of the tower kettle of the isobutane tower 1 directly ente...

Embodiment 2

[0053] The separation and purification method of embodiment 2 isobutane, n-butane and butene, process flow sheet can refer to Figure 1-2 , the mixed carbon four contains more carbon five components, and the decarbonization five towers are added after the three decarbonization towers, the mixed carbon four raw materials 4 advanced decarbonization three towers 13, and the carbon three components are extracted from the top of the decarbonization three towers Out of 14, mixed carbon four 15 is extracted from the decarburization three tower kettle and then enters the de-C5 tower 17, carbon five component 18 is extracted from the carbon five tower kettle, and mixed carbon four 19 is extracted from the top of the tower and enters the middle part of the isobutane tower 1 Material, the circulating solvent 5 of the isobutane tower is fed from the top of the isobutane tower 1, and the top of the isobutane tower 1 obtains isobutane 6, and the extraction product 7 of the isobutane tower 1 i...

Embodiment 3

[0058] Example 3 The separation and purification method of isobutane, n-butane and butene, the isobutane can be extracted from the top of the tower and then introduced into the isobutane refining tower, refer to the attached Figure 1-2 , using acetonitrile and water as a solvent, the content of acetonitrile in the mixture is 1-99%, the purity of the obtained isobutane is 96%, the purity of n-butane is 87.3%, and the purity of n-butene is 97.5%. Solvent enters stripping tower intermediate reboiler, isobutane tower intermediate reboiler, n-butane tower intermediate reboiler, decarburization five tower intermediate reboiler, decarburization three tower intermediate reboiler, raw material preheater , the energy consumption is reduced from 1.3 tons of steam / ton of carbon four to 1.0 tons of steam / ton of carbon four.

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Abstract

The invention provides an iso-butane, n-butane and butylene separation and purification method. C4 raw materials are successively put into a C3 decarburization tower, a C5 decarburization tower, an iso-butane tower, an n-butane tower and a stripping tower to obtain high-purity iso-butane, n-butane and butylene. Solvents are cyclically utilized. The iso-butane, n-butane and butylene separation and purification method has the technical advantages that not only can equipment investment be reduced, but also the advantages of extractive distillation are used and the energy consumption is reduced.

Description

Technical areas: [0001] The invention relates to a method for separation and purification of isobutane, n-butane and butene. Background technique [0002] Among the four carbon components, 1,3-butadiene was the first raw material for synthetic rubber to be separated and used. Among the remaining components, isobutylene can be used to produce methyl tert-butyl ether (MTBE), n-butene (1-butene, cis-2-butene, trans-2-butene) can produce sec-butanol and methyl ethyl ketone. The existing C4 separation method is to first use extractive distillation to obtain butadiene, then react the remaining C4 with methanol to obtain MTBE, and then extract and distill the remaining C4 to obtain n-butene. The top product of the extractive distillation tower is an alkane mixture containing isobutane and n-butane. This mixture is usually burned as liquefied gas, and its value is not fully utilized. For example, n-butane can produce maleic anhydride and isobutane. It can be dehydrogenated to prod...

Claims

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Application Information

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IPC IPC(8): C07C9/12C07C9/10C07C11/08C07C7/04C07C7/08
Inventor 任万忠许文友王文华陈小平赵旗虞乐舜
Owner YANTAI UNIV
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