CN102249837A - Purification method for butylene by chemical separation process - Google Patents
Purification method for butylene by chemical separation process Download PDFInfo
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- CN102249837A CN102249837A CN2011102164888A CN201110216488A CN102249837A CN 102249837 A CN102249837 A CN 102249837A CN 2011102164888 A CN2011102164888 A CN 2011102164888A CN 201110216488 A CN201110216488 A CN 201110216488A CN 102249837 A CN102249837 A CN 102249837A
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- butylene
- isobutene
- iso
- trimethylmethane
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Abstract
The invention discloses a purification method for butylene by a chemical separation process. The method is characterized in that: such measures as a two-stage reaction and excess methanol have already been employed at the synthetic phase of methyl tertiary butyl ether so as to improve the removal rate of isobutene; C4 materials which have been deprived of isobutene are subjected to hydrotreatment to remove impurities like butadiene and then to rectification; tower bottoms are 2-butylene and n-butane, while overhead fractions are 1-butylene and isobutene; the overhead fractions are subjected to extractive distillation to separate isobutene, and therefore high purity 1-butylene is obtained. The invention has the advantages of reasonable technology and simple preparation, and is the simplest ideal technology for preparing butylene.
Description
Technical field
The present invention relates to a kind of Chemicals, particularly a kind of technology that adopts fractionation purification butylene is suitable for producing high-purity butylene.
Background technology
This product as fuel and the refrigerant, is used to produce multiple organic synthesis raw material, as making butylene and divinyl through dehydrogenation except that directly in a large number; Can make MALEIC ANHYDRIDE, acetic acid etc. through catalyzed oxidation; Can make butyl halide through halogenation; Through the nitrated nitrobutane of making; Catalysis at high temperature can be made dithiocarbonic anhydride; Can produce hydrogen through the water vapor conversion.In addition, butane also can be done the automotive fuel admixture with the control volatile matter; Also can make the refining deasphalting medium of heavy oil; Wax precipitation solvent in the oil well; Be used for the slime flux agent of secondary petroleum recovery; Resin expanded dose; Seawater is converted into the cooling agent of fresh water, and alkene Ziegler polymer solvent etc.
Summary of the invention
Problem to be solved by this invention is, overcomes the deficiencies in the prior art, and original technology is to obtain high-purity butylene, adopts this law to enhance productivity greatly, and present method provides a kind of equipment and technology.This technology not only technology is reasonable, and has solved the problem of producing high-purity normal butane.
The technical solution used in the present invention is:
A kind of method that adopts fractionation purification butylene, it is characterized in that just adopting two-stage reaction and the excessive measure of methyl alcohol at the synthesis phase of methyl tertiary butyl ether, to improve the decreasing ratio of iso-butylene, the C4 material that removes behind the iso-butylene carries out hydrotreatment, removes impurity such as divinyl, carries out rectifying then, at the bottom of the tower 2-butylene and normal butane, overhead fraction is 1-butylene and Trimethylmethane, this overhead fraction is carried out extractive distillation tell Trimethylmethane, promptly obtains high purity butene-1.
Require purity to reach more than 99% during butene monomers, require purity to reach more than 99.5% during as the linear low density polyethylene comonomer; Aspect some user demand some impurity there is being tighter restriction, is requiring iso-butylene content when producing the butylene oxide ring raw material less than 0.1% as conduct.
By the catalytic cracking gained generally speaking, the product that is used to become more meticulous synthesizes when reaching as polymer monomer has higher requirement to purity, as poly-1-C4 cut, because of butadiene content is very few, can directly use without the extracting and separating divinyl.By the C 4 fraction that hydrocarbon cracking obtains, then, should handle through the extractive distillation separation of butadiene because of containing more divinyl.The extraction polar solvents that adopt more, industrial widespread usage diformamide method, N methylpyrrolidone process, acetonitrile method etc. are arranged.In the raffinate behind the extraction divinyl, main component is 4 isomer of butylene, if the divinyl residual volume promptly can be used as the basic material of producing 1-butylene less than 1% in the raffinate, can directly be used as the mixed butene industrial raw material sometimes.The classical group of divinyl raffinate becomes to see the following form.
The typical case of divinyl raffinate forms:
Adopt general rectificating method just the hydro carbons of C4 hydro carbons with other carbon numbers can be separated, but will obtain highly purified 1-butylene from the hybrid C 4 hydro carbons need separate according to the composition of hybrid C 4 hydro carbons.Following table is the boiling point of C4 hydro carbons, can see that the boiling point between them is very approaching from table, is not that general rectificating method institute can be isolating, especially with 1-butylene and iso-butylene for very.
The boiling point of various C4 hydro carbons
The invention discloses a kind of technology that adopts fractionation purification butylene, because of adopting the method for chemical process separation of C 4 cuts.1-butylene is as homopolymerization or comonomer, and is very high to purity requirement, especially all must thoroughly remove the deleterious impurity of polyreaction such as alkynes, diolefine and iso-butylene etc.At first just adopt measures such as two-stage reaction and methyl alcohol is excessive, to improve the decreasing ratio of iso-butylene at the synthesis phase of methyl tertiary butyl ether.The C4 material that removes behind the iso-butylene also need carry out hydrotreatment, removes impurity such as divinyl, carries out rectifying then, at the bottom of the tower 2-butylene and normal butane, overhead fraction is 1-butylene and Trimethylmethane, this overhead fraction is carried out extractive distillation tell Trimethylmethane, promptly obtains high purity butene-1.
The butylene of the present invention's preparation has following characteristic:
Triple point: one 185.4 ℃
Boiling point (101.325kPa): one 6.3 ℃
Fluid density (one 6.3 ℃, 100kPa): 630kg/m3
Gas density (101.325kPa, 25 ℃): 2.365kg/m3
Relative density (101.325kPa, 25 ℃, air=1): 2.0
Specific volume (21.1 ℃, 101.325kPa): 0.4182m3/kg
The gas-liquid volumetric ratio (15 ℃, 100kPa): 261L/L.
Description of drawings:
Fig. 1 produces the high purity butene-1 schematic flow sheet for after the etherificate; 1-distillation tower wherein; The 2-phase splitter; 3-hydrogenation reaction part; The 4-separation column; The 5-extraction distillation column.
Embodiment:
Below in conjunction with embodiment the present invention is described, the scheme of embodiment described here, do not limit the present invention, one of skill in the art can make improvements and change according to spirit of the present invention, described these improvement and variation all should be considered as within the scope of the invention, and scope of the present invention and essence are limited by claim.
Embodiment 1
Synthesis phase at methyl tertiary butyl ether just adopts two-stage reaction and the excessive measure of methyl alcohol, to improve the decreasing ratio of iso-butylene, the C4 material that removes behind the iso-butylene carries out hydrotreatment, removes impurity such as divinyl, carries out rectifying then, at the bottom of the tower 2-butylene and normal butane, overhead fraction is 1-butylene and Trimethylmethane, this overhead fraction is carried out extractive distillation tell Trimethylmethane, promptly obtains high purity butene-1,1500 kilograms, Fig. 1 is seen in technical process.
Embodiment 2
Synthesis phase at methyl tertiary butyl ether just adopts two-stage reaction and the excessive measure of methyl alcohol, to improve the decreasing ratio of iso-butylene, the C4 material that removes behind the iso-butylene carries out hydrotreatment, removes impurity such as divinyl, carries out rectifying then, at the bottom of the tower 2-butylene and normal butane, overhead fraction is 1-butylene and Trimethylmethane, this overhead fraction is carried out extractive distillation tell Trimethylmethane, promptly obtains high purity butene-1,2000 kilograms, Fig. 1 is seen in technical process.
Synthesis phase at methyl tertiary butyl ether just adopts two-stage reaction and the excessive measure of methyl alcohol, to improve the decreasing ratio of iso-butylene, the C4 material that removes behind the iso-butylene carries out hydrotreatment, removes impurity such as divinyl, carries out rectifying then, at the bottom of the tower 2-butylene and normal butane, overhead fraction is 1-butylene and Trimethylmethane, this overhead fraction is carried out extractive distillation tell Trimethylmethane, promptly obtains high purity butene-1,4000 kilograms, Fig. 1 is seen in technical process.
Claims (1)
1. method that adopts fractionation purification butylene, it is characterized in that just adopting two-stage reaction and the excessive measure of methyl alcohol at the synthesis phase of methyl tertiary butyl ether, to improve the decreasing ratio of iso-butylene, the C4 material that removes behind the iso-butylene carries out hydrotreatment, removes impurity such as divinyl, carries out rectifying then, at the bottom of the tower 2-butylene and normal butane, overhead fraction is 1-butylene and Trimethylmethane, this overhead fraction is carried out extractive distillation tell Trimethylmethane, promptly obtains high purity butene-1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102164888A CN102249837A (en) | 2011-07-29 | 2011-07-29 | Purification method for butylene by chemical separation process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102164888A CN102249837A (en) | 2011-07-29 | 2011-07-29 | Purification method for butylene by chemical separation process |
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| CN2011102164888A Pending CN102249837A (en) | 2011-07-29 | 2011-07-29 | Purification method for butylene by chemical separation process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103958647A (en) * | 2011-12-05 | 2014-07-30 | 巴斯夫欧洲公司 | Method for providing a vaporous purified crude c4 fraction as a feed stream for an extractive distillation process using a selective solvent |
| US11407697B2 (en) | 2019-05-31 | 2022-08-09 | Sabic Global Technologies B.V. | Process for producing high purity 1-butene |
-
2011
- 2011-07-29 CN CN2011102164888A patent/CN102249837A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103958647A (en) * | 2011-12-05 | 2014-07-30 | 巴斯夫欧洲公司 | Method for providing a vaporous purified crude c4 fraction as a feed stream for an extractive distillation process using a selective solvent |
| US11407697B2 (en) | 2019-05-31 | 2022-08-09 | Sabic Global Technologies B.V. | Process for producing high purity 1-butene |
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Application publication date: 20111123 |