GB588037A - Process for the separation of c diolefins from mixtures thereof with other hydrocarbons - Google Patents
Process for the separation of c diolefins from mixtures thereof with other hydrocarbonsInfo
- Publication number
- GB588037A GB588037A GB1372444A GB1372444A GB588037A GB 588037 A GB588037 A GB 588037A GB 1372444 A GB1372444 A GB 1372444A GB 1372444 A GB1372444 A GB 1372444A GB 588037 A GB588037 A GB 588037A
- Authority
- GB
- United Kingdom
- Prior art keywords
- isoprene
- azeotrope
- solvent
- diolefins
- hydrocarbons
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/005—Processes comprising at least two steps in series
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/04—Purification; Separation; Use of additives by distillation
- C07C7/05—Purification; Separation; Use of additives by distillation with the aid of auxiliary compounds
- C07C7/06—Purification; Separation; Use of additives by distillation with the aid of auxiliary compounds by azeotropic distillation
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/04—Purification; Separation; Use of additives by distillation
- C07C7/05—Purification; Separation; Use of additives by distillation with the aid of auxiliary compounds
- C07C7/08—Purification; Separation; Use of additives by distillation with the aid of auxiliary compounds by extractive distillation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Water Supply & Treatment (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
In the process of separating C5 diolefins from mixture thereof with hydrocarbons of similar boiling points, refractive indices, and degrees of unsaturation by fractionating to separate a distillate fraction concentrated in said diolefins, subjecting this to extractive distillation with a solvent which is continually recycled and which affects the relative volatilities of the hydrocarbons, separating a fraction concentrated in a desired C5 diolefin, and fractionating to purify the same, as described in the parent Specification, an azeotropic distillation is substituted for the first fractionation. The added solvent for the azeotropic distillation is, in general, of the same type as that used in the subsequent extractive distillation, e.g., liquid polar organic compounds containing oxygen, nitrogen, sulphur, selenium, or phosphorous, and having the ability to form azeotropes with the desired hydrocarbon. Saturated ketones, amines, alcohols, and their mixtures with water are specified. An amount of solvent sufficient only to give the azeotropes is normally employed in the first stage while a large excess is used in the extractive distillation step. A debutanized cracking distillate containing 4.1 per cent. isoprene is fractionated in the presence of entrainer liquid sufficient to form an isoprene azeotrope but insufficient to form an azeotrope with trimethylethylene. Using aqueous acetone, about 1 vol. to 10 of feedstock is necessary, a ternary azeotrope of isoprene, acetone and water being formed. With a reflux ratio of 5, and top and bottom temperatures of 140 and 275 DEG F., most of the isoprene and aqueous acetone are removed as overhead. The subsequent treatment is the same as that in the parent Specification.ALSO:In the process of separating C5 diolefins from mixtures thereof with hydrocarbons of similar boiling points, refractive indices, and degrees of unsaturation by fractionating to separate a distillate fraction concentrated in said diolefins, subjecting this to extractive distillation with a solvent which is continuously recycled and which affects the relative volatilities of the hydrocarbons, separating a fraction concentrated in a desired C5 diolefin, and fractionating to purify the same, as described in the parent Specification, an azeotropic distillation is substituted for the first fractionation. The added solvent for the azeotropic distillation is, in general, of the same type as that used in the subsequent extractive distillation, e.g. liquid polar organic compounds containing oxygen, nitrogen, sulphur, selenium or phosphorus, and having the ability to form azeotropes with the desired hydrocarbon. Saturated ketones, amines, alcohols, and their mixtures with water are specified. An amount of solvent sufficient only to give the azeotropes is normally employed in the first stage while a large excess is used in the extractive distillation step. A debutanized cracking distillate containing 4.1 per cent isoprene is fractionated in the presence of entrainer liquid sufficient to form an isoprene azeotrope but insufficient to form an azeotrope with trimethylethylene. Using aqueous acetone, about 1 vol to 10 of feedstock is necessary, a ternary azeotrope of isoprene, acetone and water being formed. With a reflux ratio of 5, and top and bottom temperatures of 140 and 275 DEG F. most of the isoprene and aqueous acetone are removed as overhead. The subsequent treatment is the same as that described in the parent Specification.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1372444A GB588037A (en) | 1944-07-18 | 1944-07-18 | Process for the separation of c diolefins from mixtures thereof with other hydrocarbons |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1372444A GB588037A (en) | 1944-07-18 | 1944-07-18 | Process for the separation of c diolefins from mixtures thereof with other hydrocarbons |
Publications (1)
Publication Number | Publication Date |
---|---|
GB588037A true GB588037A (en) | 1947-05-13 |
Family
ID=10028218
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1372444A Expired GB588037A (en) | 1944-07-18 | 1944-07-18 | Process for the separation of c diolefins from mixtures thereof with other hydrocarbons |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB588037A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100575319C (en) * | 2006-12-31 | 2009-12-30 | 淄博齐鲁乙烯鲁华化工有限公司 | Circulating solvent uses the method for azeotropic dehydration in the C5 extraction separation diene |
CN102850158A (en) * | 2011-06-29 | 2013-01-02 | 中国石油化工股份有限公司 | Mixed solvent for C 5 separation |
-
1944
- 1944-07-18 GB GB1372444A patent/GB588037A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100575319C (en) * | 2006-12-31 | 2009-12-30 | 淄博齐鲁乙烯鲁华化工有限公司 | Circulating solvent uses the method for azeotropic dehydration in the C5 extraction separation diene |
CN102850158A (en) * | 2011-06-29 | 2013-01-02 | 中国石油化工股份有限公司 | Mixed solvent for C 5 separation |
CN102850158B (en) * | 2011-06-29 | 2014-12-31 | 中国石油化工股份有限公司 | Mixed solvent for C5 separation |
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