CN100999434A - 5C separating and comprehensive utilization by acetonitrile solvent method - Google Patents
5C separating and comprehensive utilization by acetonitrile solvent method Download PDFInfo
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- CN100999434A CN100999434A CN 200610000659 CN200610000659A CN100999434A CN 100999434 A CN100999434 A CN 100999434A CN 200610000659 CN200610000659 CN 200610000659 CN 200610000659 A CN200610000659 A CN 200610000659A CN 100999434 A CN100999434 A CN 100999434A
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Abstract
This invention takes acetonitrile as extraction agent, and the process flow chart including two poly heat removal dicyclopentadiene, raw materials pre-separation, the first extractive distillation, the second extraction distillation, washing tower and refining unit. The specific acetonitrile process include: put coarse material C5 fraction into C4 decarbonization towers, then take the tower kettle C5 and C4 fractions of 2-butyne into dicyclopentadiene system to through distillation process to obtain dicyclopentadiene component. The system consists mainly of two poly thermal reactors, the C5 decarbonization tower, C6 decarbonization tower, and DCPD depolymerization prolapse tower, and removal light and heavy after two thermal polies, and gain refined dicyclopentadiene. Add the components get from top of C5 tower into isoprene system, first through pre-separation of C5 raw materials and then enter the first extractive distillation column; take acetonitrile as solvent extraction to carry out extractive distillation, to obtain isoprene, alkyne etc. C5 diolefins rich contained solvent materials from tower reactor; then enter the second extraction distillation column, through controlling tower operating conditions and quantity of extractant, mainly for alkyne extractive distillation, then the tower reactor materials enter flash tower, and then washing system; at the same time, isoprene components enter washing system; extraction agent can recycle by recovering tower; After extraction and washing process, then the refining system, which is the light and heavy remove tower of isoprene, to gain high purity isoprene.
Description
Technical field
This patent relates to that a kind of carbon five (C5) cut separates and comprehensive utilization method, and research and development carbon five isolation technique can solve the data deficiencies of present existence and need the problem of long-term operation.The new flow process and the method that propose are developed a kind of flow process of carbon five comprehensive utilizations of resources of practicality, can solve the problem that is run into, and course of industrialization is finished smoothly
Background technology
The cracked C 5 fraction sepn process at first is based on cyclopentadiene and is easy to dimerization and becomes dicyclopentadiene, and dicyclopentadiene at high temperature can depolymerize to the characteristics of cyclopentadiene, isolates cyclopentadiene earlier.Remove the carbon five after the dicyclopentadiene or adopt rectifying separation to obtain the enriched material of isoprene and m-pentadiene, or to adopt extracting rectifying to obtain content be m-pentadiene and isoprene.Also can further isolate isopentene, Skellysolve A and 1-amylene, 2-butyne, 3-methyl-1-butene in the raffinating oil after isolating 3 kinds of diolefins, or the like.The core of cracked C 5 fraction isolation technique is an extracting rectifying, because the specification of quality of polymerization grade isoprene is very high, the content of impurity is very low, can only add certain solvent and change the relative volatility between each component in the C5 fraction, promptly reaches isolating purpose by extracting rectifying.Because in sepn process, polymerization, oxidation can take place in the alkene in the C5 fraction, therefore, will add stopper in sepn process, generally adopt the composite polymerzation inhibitor system.In sum, whole sepn process can be divided into raw materials pretreatment unit, the first extracting rectifying unit, the second extracting rectifying unit, m-pentadiene, dicyclopentadiene separating unit and solvent systems, in addition also has auxiliary unit and basin district.
Summary of the invention
Adopt acetonitrile to make extraction agent, process flow sheet comprises that mainly hot dimerization removes dicyclopentadiene, the raw material pre-separation, first extracting rectifying, second extracting rectifying, water wash column and refined unit, the particular content of acetonitrile method technical process comprises: the thick C 5 fraction of raw material is introduced into decarburization four towers, C5 fraction of tower still and C-4-fraction 2-butyne enter the rectifying that the dipentadiene system obtains the dicyclopentadiene component then, this system mainly comprises hot dipolymer reactor, take off the C5 tower, take off the C6 tower, dicyclopentadiene (DCPD) depolymerization weight-removing column, take off light after the hot again dimerization, take off heavy process, obtain the purified dicyclopentadiene, enter the isoprene system taking off the component that the C5 column overhead obtains, carry out earlier entering first extractive distillation column after the pre-separation of C5 raw material, with the acetonitrile is that solvent carries out extracting rectifying, must be rich in isoprene by the tower still, the solvent material of C 5 dienes such as alkynes; Then enter second extractive distillation column, by the operational condition of control tower and the add-on of extraction agent, mainly carry out the extracting rectifying of alkynes, tower still material enters flashing tower, enter water wash system then, simultaneously, components such as cat head isoprene also enter water wash system, and extraction agent is through can recycle and reuse behind the recovery tower, behind extraction process and water washing process, enter refining system, just isoprene take off light, weight-removing column, obtain highly purified isoprene.
Description of drawings
Accompanying drawing is that the C5 fraction of acetonitrile solvent method separates and the schema that fully utilizes
101 towers are for taking off the C4 tower, and 1 strand of material is a carbon Wuyuan material, and 2 strands of materials are carbon four commodity of raffinating oil
102 towers are raw material pre-separation tower
103 towers are the isoprene extractive distillation column
104 towers are the alkynes extractive distillation column
105 towers are the alkynes flashing tower
106 towers are alkynes, acetonitrile water wash column, and 3 strands of materials are carbon five alkynes
107 towers are alkane, alkene water wash column, and 4 strands of materials are carbon five raffinate oil
108 towers are the isoprene water wash column
109 towers are the acetonitrile recovery tower, and 5 strands of materials are acetonitrile, and 6 strands of materials are handled for the waste water decontaminated water
110 towers are the isoprene lightness-removing column, and 7 strands of materials are for taking off light carbon five
111 towers are the isoprene weight-removing column, and 8 strands of materials are the isoprene commodity, and 9 strands of materials are for taking off heavy carbon five commodity
501 towers are the hot dipolymer reactor of CPD
502 towers are for taking off the C5 tower
503 towers are for taking off the C6 tower, and 10 strands of materials are carbon six commodity
504 towers are DCPD depolymerization, weight-removing column, and 11 strands of materials are the polymer commodity
505 towers are the hot dipolymer reactor of CPD
506 towers are the DCPD lightness-removing column, and 12 strands of materials are for cutting heavily C5 fraction carbon elimination five resin devices
507 towers are the DCPD treating tower, and 13 strands of materials are the dicyclopentadiene commodity, and 14 strands of materials are the heavy constituent commodity
Embodiment
The key of this technical process is a collection, the two collection processes that acetonitrile is made extraction agent, the acetonitrile extraction process is one of method of the separating carbon 5 fraction that abroad is most widely used at present, and the whole flow process of this method can be divided 3 steps: the first step, the removing of cyclopentadiene, second step, extractive distillation.The extraction tower bottoms is diolefine and carbon five alkynes, and extraction liquid enters desorption tower again, and diolefine that desorbs and alkynes wash with water earlier to remove the acetonitrile of deentrainment, and acetonitrile and water are proposed dense regeneration in solvent recovery tower.In the 3rd step, superfractionation is told isoprene from cat head, and its purity can reach 99.5%.The acetonitrile method characteristics are that acetonitrile is the by product of ammoxidating propylene to produce acrylonitrile, and the source is abundant, and is cheap, little to equipment corrosion.Because acetonitrile viscosity is low, so the extraction distillation column plate efficiency is higher.
Claims (8)
1. the separation of a C5 fraction and method of comprehensive utilization are separated the fourth process flow and are comprised that mainly hot dimerization removes dicyclopentadiene, raw material pre-separation, first extracting rectifying, second extracting rectifying, water wash column and unit such as refining; Comprehensive utilization comprises the preparation polyisoprene rubber, obtains the dicyclopentadiene of pharmaceutical quality standard-required etc.
2. according to the requirement of right 1, in extracting rectifying, second extracting rectifying, extraction agent is selected acetonitrile.
3. according to the requirement of right 1, the whole flow process of this method can be divided 3 steps: the first step, the removing of cyclopentadiene, second step, extractive distillation, the 3rd step, superfractionation.
4. according to the requirement of right 1, in dicyclopentadiene unit, raw material is by hot dipolymer reactor, decarburization five towers, and decarburization six towers, the depolymerization weight-removing column, hot dipolymer reactor, and lightness-removing column and treating tower obtain the dicyclopentadiene product.
5. according to the requirement of right 1, in extraction cells, the material that comes out from isoprene extracting rectifying Tata still directly enters the alkynes extractive distillation column, then through entering follow-up water wash column behind the alkynes flashing tower.
6. according to the requirement of right 1,, enter ensuing refined unit, promptly take off light, weight-removing column, obtain the isoprene product through behind the water wash system.
7. according to the requirement of right 1, it is characterized in that preparing rubber with isoprene.
8. according to the requirement of right 1, it is characterized in that preparing medicinal dicyclopentadiene with cyclopentadiene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610000659 CN100999434A (en) | 2006-01-11 | 2006-01-11 | 5C separating and comprehensive utilization by acetonitrile solvent method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610000659 CN100999434A (en) | 2006-01-11 | 2006-01-11 | 5C separating and comprehensive utilization by acetonitrile solvent method |
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| CN100999434A true CN100999434A (en) | 2007-07-18 |
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| CN 200610000659 Pending CN100999434A (en) | 2006-01-11 | 2006-01-11 | 5C separating and comprehensive utilization by acetonitrile solvent method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102516010A (en) * | 2011-11-25 | 2012-06-27 | 大庆华科股份有限公司 | Method and equipment for separating diolefin component in oil cracking ethylene byproduct carbon-5 fraction |
| CN103709066A (en) * | 2013-12-25 | 2014-04-09 | 天津大学 | System and method for separating out acetonitrile in acetonitrile-water-dicyclopentadiene system |
| CN103724227A (en) * | 2013-12-25 | 2014-04-16 | 天津大学 | System and method for refining recycle solvent through extracting isoprene by acetonitrile |
| CN104230626A (en) * | 2013-06-21 | 2014-12-24 | 中国石油天然气股份有限公司 | Method for desulfurizing isoprene separated from ethylene cracking carbon penta |
| CN109663379A (en) * | 2017-10-13 | 2019-04-23 | 抚顺伊科思新材料有限公司 | A kind of energy conservation acetonitrile method cracking c_5 separation method |
| CN111454116A (en) * | 2013-06-05 | 2020-07-28 | 苏尔寿际特科技美国公司 | Method and device for separating C5 diolefins from pyrolysis gasoline |
-
2006
- 2006-01-11 CN CN 200610000659 patent/CN100999434A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102516010A (en) * | 2011-11-25 | 2012-06-27 | 大庆华科股份有限公司 | Method and equipment for separating diolefin component in oil cracking ethylene byproduct carbon-5 fraction |
| CN111454116A (en) * | 2013-06-05 | 2020-07-28 | 苏尔寿际特科技美国公司 | Method and device for separating C5 diolefins from pyrolysis gasoline |
| CN104230626A (en) * | 2013-06-21 | 2014-12-24 | 中国石油天然气股份有限公司 | Method for desulfurizing isoprene separated from ethylene cracking carbon penta |
| CN104230626B (en) * | 2013-06-21 | 2016-01-20 | 中国石油天然气股份有限公司 | Method for desulfurizing isoprene separated from ethylene cracking carbon penta |
| CN103709066A (en) * | 2013-12-25 | 2014-04-09 | 天津大学 | System and method for separating out acetonitrile in acetonitrile-water-dicyclopentadiene system |
| CN103724227A (en) * | 2013-12-25 | 2014-04-16 | 天津大学 | System and method for refining recycle solvent through extracting isoprene by acetonitrile |
| CN103724227B (en) * | 2013-12-25 | 2016-03-30 | 天津大学 | Acetonitrile method isoprene extraction circulating solvent refining system and method |
| CN109663379A (en) * | 2017-10-13 | 2019-04-23 | 抚顺伊科思新材料有限公司 | A kind of energy conservation acetonitrile method cracking c_5 separation method |
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