CN100447118C - Extractive distillation separation method of normal hexane and methylcyclopentane - Google Patents
Extractive distillation separation method of normal hexane and methylcyclopentane Download PDFInfo
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- CN100447118C CN100447118C CNB2005100954400A CN200510095440A CN100447118C CN 100447118 C CN100447118 C CN 100447118C CN B2005100954400 A CNB2005100954400 A CN B2005100954400A CN 200510095440 A CN200510095440 A CN 200510095440A CN 100447118 C CN100447118 C CN 100447118C
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- Prior art keywords
- methylcyclopentane
- solvent
- tower
- normal hexane
- dimethyl phthalate
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- GDOPTJXRTPNYNR-UHFFFAOYSA-N methylcyclopentane Chemical compound CC1CCCC1 GDOPTJXRTPNYNR-UHFFFAOYSA-N 0.000 title claims abstract description 76
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 238000000926 separation method Methods 0.000 title claims abstract description 14
- 238000000895 extractive distillation Methods 0.000 title claims abstract description 11
- 239000002904 solvent Substances 0.000 claims abstract description 39
- NIQCNGHVCWTJSM-UHFFFAOYSA-N Dimethyl phthalate Chemical compound COC(=O)C1=CC=CC=C1C(=O)OC NIQCNGHVCWTJSM-UHFFFAOYSA-N 0.000 claims abstract description 32
- FBSAITBEAPNWJG-UHFFFAOYSA-N dimethyl phthalate Natural products CC(=O)OC1=CC=CC=C1OC(C)=O FBSAITBEAPNWJG-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229960001826 dimethylphthalate Drugs 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 230000008929 regeneration Effects 0.000 claims abstract description 10
- 238000011069 regeneration method Methods 0.000 claims abstract description 10
- 238000000605 extraction Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 241000282326 Felis catus Species 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 9
- 238000010992 reflux Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 15
- 238000004821 distillation Methods 0.000 abstract description 7
- 238000011084 recovery Methods 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000007670 refining Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 238000007796 conventional method Methods 0.000 abstract 1
- 238000003912 environmental pollution Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- 230000004907 flux Effects 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The extraction, rectification and separation method of the normal hexane and the methylcyclopentane comprises the following steps: adding raw material industrial hexane and an extractive distillation solvent dimethyl phthalate into an extractive distillation tower according to a certain proportion; after separation, the tower top is high-purity n-hexane, and the tower bottom is solvent dimethyl phthalate + methylcyclopentane; the tower bottom material is sent into a solvent regeneration tower for distillation operation, and the extracted substance at the tower top is methyl cyclopentane; further refining the methylcyclopentane of the tower top extract to obtain high-purity methylcyclopentane; the dimethyl phthalate serving as a solvent in the tower bottom is sent back to the extraction and rectification tower for recycling, and the certain mixture ratio is as follows: the mass flow ratio of the raw materials to the solvent is 1: 3-5. According to the invention, the methylcyclopentane in the raw material can be recovered, the recovery rate is more than or equal to 90%, and the normal hexane product with the purity of more than or equal to 98% can be obtained; the solvent dimethyl phthalate of the extraction and rectification can be recycled. Compared with the conventional method, the method has the advantages of higher product purity, higher recovery rate, lower energy consumption and no environmental pollution.
Description
Technical field
The present invention relates to a kind of separation method of chemical industry, the extraction and rectification separation method of particularly a kind of normal hexane and methylcyclopentane.
Background technology
Normal hexane and methylcyclopentane all are important basic Organic Chemicals and organic chemical industry's solvents, are widely used in Chemical Manufacture, and it is about 12% to contain normal hexane in the refinery oil refining apparatus reforming raffinate oil, methylcyclopentane 1～2%.Because normal hexane boiling point (68.7 ℃) and methylcyclopentane boiling point (71.8 ℃) are approaching, can only obtain the industrial hexane of content 89～90% by the conventional distillation method, wherein still have the methylcyclopentane about 10%.If to its further separation, then energy consumption is too big with the conventional distillation method.This part resource of China not further development and use always at present, with the Nanjing Refinery is example, this factory produces per year and raffinates oil 750,000 tons at present, all sell, if wherein normal hexane and methylcyclopentane separation purification can be produced 70000 tons of normal hexanes per year with solvent oil, about 7000 tons of methylcyclopentanes, surplus person still can sell by solvent oil, and resource is fully used, and also can increase the business economic benefit greatly.
Summary of the invention
The present invention will provide the extraction and rectification separation method of a kind of normal hexane and methylcyclopentane, this method is a kind of commercial run that normal hexane and methylcyclopentane can be separated, purify and reach commercial application, the too big disadvantage of energy consumption when separating to overcome the conventional distillation method.
The present invention is raw material (containing 90% normal hexane, 10% methylcyclopentane) with the industrial hexane, with the dimethyl phthalate is solvent, carry out the extracting rectifying operation, separate the normal hexane in the purifying industrial hexane, reclaim methylcyclopentane simultaneously, the solvent dimethyl phthalate can be recycled through regeneration.
The technical scheme of finishing the foregoing invention task is: the extraction and rectification separation method of normal hexane and methylcyclopentane, and its step is as follows:
The solvent dimethyl phthalate of primary industry hexane and extracting rectifying is added extractive distillation column with certain proportioning;
After the separation, cat head is high purity normal hexane (〉=98%), and the tower still is solvent dimethyl phthalate+methylcyclopentane;
Tower still material is sent into solvent regeneration tower and is carried out distillation procedure, and the cat head production is methylcyclopentane (〉=84%);
The further refining high-purity methyl pentamethylene that obtains of the methylcyclopentane of cat head production;
Tower still solvent dimethyl phthalate is sent extractive distillation column back to and is recycled.
Described " certain proportioning " is meant: the mass flux ratio of raw material and solvent is 1: 3～5, preferred 1: 4.
More optimize and in more detail, method provided by the invention is technical process shown in Figure 1, separating apparatus adopts optimizes processing condition, can obtain the high purity normal hexane after the separation, simultaneously the methylcyclopentane rate of recovery 〉=90%;
Normal hexane is with the extraction and rectification separation method of methylcyclopentane: 9. 1. the primary industry hexane added extractive distillation column with the solvent dimethyl phthalate of extracting rectifying, raw material flow 1. is 5Kg/h, solvent flow 9. is 20Kg/h, extractive distillation column T1 tower top temperature is 68-69 ℃, tower still temperature is 195-200 ℃, control of reflux ratio is at 4-5, and 3. the cat head production is the high purity normal hexane, and flow is 4.5Kg/h; 4. the discharging of tower still is solvent+methylcyclopentane, flow is 20.5Kg/h, this part discharging is the charging of solvent regeneration tower T2 simultaneously, and solvent regeneration tower T2 tower top temperature is 71-72 ℃, and tower still temperature is about 220 ℃, control of reflux ratio is at 4-5,7. the cat head production is methylcyclopentane, and flow is 0.5Kg/h, and 9. the discharging of tower still is solvent, flow is 20Kg/h, recycles.
Advantage of the present invention: adopt technical process shown in Figure 1 and optimized parameters, raw material is that industrial hexane (contains 90% normal hexane, 10% methylcyclopentane), with the dimethyl phthalate is solvent, at first carry out the extracting rectifying operation through extractive distillation column T1, overhead product is the normal hexane of purity 〉=98%, tower kettle product distills processing through solvent regeneration tower T2, methylcyclopentane in the recyclable raw material of one side, the solvent dimethyl phthalate of extracting rectifying is recycled, operate by two towers, can obtain the normal hexane product of purity 〉=98%, and make the methylcyclopentane rate of recovery 〉=90% simultaneously.Compare with common distillation, Azotropic distillation method that routine is used, product purity is higher, and the rate of recovery is higher, and energy consumption is lower.Simultaneously, because the whole process solvent can be recycled, production cost is lower, and can not throw into question to environment.
Description of drawings
Fig. 1 is the technical process of extracting rectifying and solvent reclamation.
Embodiment
Extracting rectifying separates the method for normal hexane and methylcyclopentane, with reference to processing parameter shown in technical process shown in Figure 1 and the table 1,1. raw material is industrial hexane, and wherein the mass content of normal hexane and methylcyclopentane is respectively 90%, 10%, flow is 5Kg/h, 9. solvent is dimethyl phthalate, and flow is 20Kg/h, and extractive distillation column T1 tower top temperature is 68-69 ℃, tower still temperature is 195-200 ℃, control of reflux ratio is at 4-5, and cat head production 3. flow is 4.5Kg/h, consists of x
Normal hexane=0.9821, x
Methylcyclopentane=0.0179, tower still discharging 4. flow is 20.5Kg/h, consists of x
Dimethyl phthalate=0.9707, x
Normal hexane=0.0039, x
Methylcyclopentane=0.0205, this part discharging is the charging of solvent regeneration tower T2 simultaneously, and solvent regeneration tower T2 tower top temperature is 71-72 ℃, and tower still temperature is about 220 ℃, and control of reflux ratio is at 4-5, and cat head production 7. flow is 0.5Kg/h, consists of x
Normal hexane=0.1547, x
Methylcyclopentane=0.8453, tower still discharging 9. flow is 20Kg/h, and wherein dimethyl phthalate mass content 〉=99.5% can recycle.1,3 is condenser among the figure,
2,4 is reboiler.1.-9. be stream burst title (table 2).
Each tower process condition of table 1
| Processing parameter | The T-1 tower | The T-2 tower |
| Theoretical plate number | 50 | 40 |
| The raw material feed entrance point | 10 | 15 |
| The solvent feed position | 35 | |
| Reflux ratio | 4-5 | 4-5 |
| Tower top temperature (℃) | 68-69 | 71-72 |
| Tower still temperature (℃) | 195-200 | 215-225 |
Burst explanation of table 2 stream
Embodiment 2, and is substantially the same manner as Example 1, but the mass flux ratio of raw material and solvent is 1: 3.
Claims (1)
1, the extraction and rectification separation method of a kind of normal hexane and methylcyclopentane, its step is as follows:
9. 1. the primary industry hexane added extractive distillation column with the solvent dimethyl phthalate of extracting rectifying, raw material flow 1. is 5Kg/h, solvent flow 9. is 20Kg/h, extractive distillation column T1 tower top temperature is 68-69 ℃, tower still temperature is 195-200 ℃, control of reflux ratio is at 4-5, and 3. the cat head production is the high purity normal hexane, and flow is 4.5Kg/h; 4. the discharging of tower still is solvent+methylcyclopentane, flow is 20.5Kg/h, this part discharging is the charging of solvent regeneration tower T2 simultaneously, and solvent regeneration tower T2 tower top temperature is 71-72 ℃, and tower still temperature is about 220 ℃, control of reflux ratio is at 4-5,7. the cat head production is methylcyclopentane, and flow is 0.5Kg/h, and 9. the discharging of tower still is solvent, flow is 20Kg/h, recycles.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100954400A CN100447118C (en) | 2005-11-16 | 2005-11-16 | Extractive distillation separation method of normal hexane and methylcyclopentane |
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| CNB2005100954400A CN100447118C (en) | 2005-11-16 | 2005-11-16 | Extractive distillation separation method of normal hexane and methylcyclopentane |
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| CN1765857A CN1765857A (en) | 2006-05-03 |
| CN100447118C true CN100447118C (en) | 2008-12-31 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101200405B (en) * | 2007-11-22 | 2010-05-19 | 广州赫尔普化工有限公司 | Method for manufacturing hexane solvent oil |
| CN101928205B (en) * | 2010-01-26 | 2013-05-08 | 南京师范大学 | Method for compositely extracting, rectifying and separating chlorophenol-parachlorophenol mixed system |
| CN102702151A (en) * | 2012-05-24 | 2012-10-03 | 南开大学 | Method for enhancing purity of 3, 4-dihydropyran by extraction and rectification |
| CN103588603B (en) * | 2012-08-13 | 2015-06-03 | 中国石油天然气股份有限公司 | Process method for producing normal hexane by using reformed raffinate oil |
| CN102942434B (en) * | 2012-11-29 | 2014-12-03 | 广州赫尔普化工有限公司 | Method extracting high purity n-hexane by integrating rectification and extraction |
| CN103215061B (en) * | 2013-03-28 | 2015-10-07 | 洛阳金达石化有限责任公司 | A kind of production technique of FT synthetic oil manufacture hexane |
| CN103242120B (en) * | 2013-04-27 | 2015-11-04 | 天津大学 | Extraction agent circulation device and process for purification in a kind of normal hexane, isohexane and benzene sepn process |
| CN105085142B (en) * | 2014-05-20 | 2018-03-20 | 中石化广州工程有限公司 | A kind of production method of high-purity n-hexane |
| CN105859506B (en) * | 2015-01-21 | 2018-07-13 | 中国石油天然气股份有限公司 | Method for separating cyclopentane and neohexane by extractive distillation process |
| CN106966852B (en) * | 2016-01-14 | 2019-10-25 | 天津大学 | The method of continuous extraction rectifying separation high-carbon n-alkane and normal olefine |
| CN107935807B (en) * | 2017-11-30 | 2020-08-11 | 中国科学院过程工程研究所 | System and method for recovering and refining methylcyclopentane and application thereof |
| CN108774101A (en) * | 2018-06-19 | 2018-11-09 | 中国石油天然气股份有限公司 | Method and system for separating n-hexane and methylcyclopentane |
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2005
- 2005-11-16 CN CNB2005100954400A patent/CN100447118C/en not_active Expired - Fee Related
Non-Patent Citations (4)
| Title |
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| 正己烷－甲基环戊烷萃取精馏分离的模拟计算及小试. 林军等.化学工业与工程，第17卷第2期. 2000 |
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