CN1213007C - Method of extracting 1,2-dichloropropane - Google Patents
Method of extracting 1,2-dichloropropane Download PDFInfo
- Publication number
- CN1213007C CN1213007C CN 02160119 CN02160119A CN1213007C CN 1213007 C CN1213007 C CN 1213007C CN 02160119 CN02160119 CN 02160119 CN 02160119 A CN02160119 A CN 02160119A CN 1213007 C CN1213007 C CN 1213007C
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- China
- Prior art keywords
- organic
- azeotropic distillation
- dichloropropane
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- propylene oxide
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Abstract
The present invention relates to a method for extracting 1, 2-dichloropropane. A chlorohydrin method is mainly used for producing propylene oxide in China, a great number of organic by-products are generated in the process of producing propylene oxide by the chlorohydrin method, the organic by-products contain a great amount of 1, 2-dichloropropane whose content is from 5 to 20% of the organic by-products. The 1, 2-dichloropropane is an organic chemical product with high value, is used as high-grade solvent of fat, oil, wax, rubber, resin, ethyl cellulose, etc., and has wide application and very high added value. In the method, an azeotropic distillation method is used for extracting the 1, 2-dichloropropane for the organic by-products which are discharged in the process of propylene oxide production, the purity of the obtained 1, 2-dichloropropane can reach over 98%, the yield is over 90%, and the method has good economic benefit and generalization value.
Description
Technical field
The present invention relates to a kind of method of purification of material, promptly a kind of about from the organic by-products of propylene oxide production process discharging, extracting 1, the method for 2-propylene dichloride.
Background technology
China's production of propylene oxide mainly adopts chlorohydrination, and chlorohydrination is produced and to be produced a large amount of organic by-products in the propylene oxide process, wherein contains in a large number 1, and 2-propylene dichloride, content occupy about the 50-90% of machine by product.Its main by product such as table 1.
Table 1
| Title | 1, the 2-propylene dichloride | Two-(2-chloro isopropyl) ether | Propylene oxide | Propylene chlorohydrin | Chlorallylene |
| Content %wt | 50-85 | 5-20 | 1-10 | 1-15 | 0-10 |
1, the 2-propylene dichloride is a kind of organic intermediate, and higher utility value is arranged, and can be used for synthetic multiple organic products.Simultaneously, 1, the 2-propylene dichloride also as the solvent of fat, oil, rubber, resin and multiple dyestuff etc., has purposes widely.
Because chlorohydrination is produced the organic by-products of being discharged in the propylene oxide process and is removed 1, the 2-propylene dichloride also has propenyl chloride, propylene chlorohydrin and two-various ingredients such as (2-chloro isopropyl) ether outward, extract 1, the relevant report of 2-propylene dichloride in the organic by-products of discharging in the domestic and international at present propylene oxide production process of still having no way of.
Summary of the invention
The objective of the invention is: the method by azeotropic distillation extracts 1 from the organic by-products of propylene oxide production process discharging, the 2-propylene dichloride, resulting 1,2-propylene dichloride purity reaches more than 98%, yield has good economic benefits and promotional value more than 95%.
Extraction 1 of the present invention, the method for 2-propylene dichloride is achieved in that
Of the present inventionly extract 1 from the organic by-products of propylene oxide production process discharging, the method for 2-propylene dichloride, its characteristics are to extract 1, the 2-propylene dichloride by the method for azeotropic distillation from the organic by-products of propylene oxide production process discharging.At first in organic by-products, add in entrainer methyl alcohol, ethanol, water, tetracol phenixin, the hexanaphthene any one, wherein any one in preferably water, tetracol phenixin and the hexanaphthene; The consumption of entrainer that azeotropic distillation adopts accounts for the 10-80% (preferred 15-50%) of material total amount; Carrying out azeotropic distillation then separates, in stage number is rectifying tower between the 15-40 piece (wherein preferred 25-40 piece), entrainer and 1, the 2-propylene dichloride forms azeotropic, (preferred 65-80 ℃, more preferably 70-80 ℃) flows out from cat head under temperature 60-80 ℃, with 1: 1-3: emit cut under the reflux ratio situation of 1 (preferred 3: 1), obtain comparatively purified 1, the 2-propylene dichloride.
The organic by-products of propylene oxide production process discharging can make 1 in the by product through behind the azeotropic distillation, and the 2-propylene dichloride is effectively separated, obtain behind the azeotropic distillation 1,2-propylene dichloride purity can reach more than 98%, yield reaches more than 95%.
Embodiment
Be described in further detail technical scheme of the present invention below in conjunction with embodiment.
Embodiment 1
In the organic by-products that certain producer production of propylene oxide workshop is discharged 1,2-propylene dichloride content reaches 80%, and other compositions are two-(2-chloro isopropyl) ether, propylene oxide, propenyl chloride, propylene chlorohydrin etc.We adopt water as entrainer, the consumption of entrainer that azeotropic distillation adopts accounts for 15% of material total amount, adopting the stage number of rectifying tower is 25, the control reflux ratio is to carry out azeotropic distillation at 3: 1, the temperature of collecting cut is at 78-80 ℃, and the cut of being purified is carried out gas chromatographic analysis and weighs, and the result shows 1,2-propylene dichloride content reaches 98%, and yield reaches 95%.
Embodiment 2-7 sees Table 2.
(seeing page 3)
Table 2
| Embodiment | Entrainer | Temperature ℃ | Stage number | Reflux ratio | The consumption of entrainer accounts for the % of material total amount | Propylene dichloride content % | Propylene dichloride yield % |
| 2 | Methyl alcohol | 60-65 | 36 | 1.5∶1 | 20 | 98 | 95 |
| 3 | Tetracol phenixin | 65-70 | 34 | 1.8∶1 | 30 | 98 | 94 |
| 4 | Hexanaphthene | 70-75 | 32 | 2.2∶1 | 40 | 97 | 93 |
| 5 | Water | 75-78 | 30 | 2.5∶1 | 65 | 98 | 96 |
| 6 | Water | 72-76 | 26 | 3∶1 | 25 | 98 | 96 |
| 7 | Water | 76-79 | 22 | 2.8∶1 | 15 | 98 | 95 |
Therefore, extract 1 through above-mentioned experiment showed, in the organic by-products of method to the propylene oxide production process discharging that adopts azeotropic distillation, the 2-propylene dichloride can obtain effect preferably.
Claims (6)
1. one kind is extracted 1 from the waste liquid of chlorohydrination production propylene oxide, and the method for 2-propylene dichloride is characterized in that: adopt the method for azeotropic distillation, selected entrainer is any one in methyl alcohol, ethanol, water, tetracol phenixin, the hexanaphthene; The temperature range of described azeotropic distillation is 60-80 ℃; The equipment that is adopted comprises rectifying tower.
2. by the described method of claim 1, it is characterized in that: the temperature of described azeotropic distillation is 65-80 ℃.
3. by the described method of claim 1, it is characterized in that: the consumption of entrainer that described azeotropic distillation adopts accounts for the 10-80% of material total amount.
4. by the described method of claim 1, it is characterized in that: the stage number of described rectifying tower is between the 15-40 piece.
5. by the described method of claim 1, it is characterized in that: the reflux ratio that described azeotropic distillation adopts is at (1-3): between 1.
6. by the described method of claim 1, it is characterized in that: described entrainer is any one in water, tetracol phenixin and the hexanaphthene; The temperature of described azeotropic distillation is 70-80 ℃; The stage number of described rectifying tower is the 25-40 piece; The reflux ratio that described azeotropic distillation adopts is 3: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02160119 CN1213007C (en) | 2002-12-31 | 2002-12-31 | Method of extracting 1,2-dichloropropane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02160119 CN1213007C (en) | 2002-12-31 | 2002-12-31 | Method of extracting 1,2-dichloropropane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1513820A CN1513820A (en) | 2004-07-21 |
| CN1213007C true CN1213007C (en) | 2005-08-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02160119 Expired - Lifetime CN1213007C (en) | 2002-12-31 | 2002-12-31 | Method of extracting 1,2-dichloropropane |
Country Status (1)
| Country | Link |
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| CN (1) | CN1213007C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101012153B (en) * | 2006-11-30 | 2010-08-18 | 天津大沽化工股份有限公司 | Method and device for extracting and recovering chloropropanol from waste liquid |
| CN103819304B (en) * | 2013-10-18 | 2016-03-23 | 中国石油化工股份有限公司 | The high mixture that boils of a kind of epoxy decolours and extracts the processing method of wherein trichloropropane |
| CN104672052B (en) * | 2015-01-06 | 2017-04-12 | 中国天辰工程有限公司 | Refining method of impure dichloropropane |
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2002
- 2002-12-31 CN CN 02160119 patent/CN1213007C/en not_active Expired - Lifetime
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| CN1513820A (en) | 2004-07-21 |
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