GB819188A - Purifying isoprene by distillation - Google Patents
Purifying isoprene by distillationInfo
- Publication number
- GB819188A GB819188A GB7239/57A GB723957A GB819188A GB 819188 A GB819188 A GB 819188A GB 7239/57 A GB7239/57 A GB 7239/57A GB 723957 A GB723957 A GB 723957A GB 819188 A GB819188 A GB 819188A
- Authority
- GB
- United Kingdom
- Prior art keywords
- isopentane
- isoprene
- per cent
- purified
- dimethylacetylene
- 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
- C07C7/04—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
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
Isoprene, such as that which has been obtained by the cracking of petroleum, is purified by adding isopentane to the impure isoprene and submitting the resulting mixture to fractional distillation whereby dimethylacetylene, isopropenylacetylene, dimethyl sulphide and other compounds which act as polymerization-inhibitors are removed as distillate. The purified isoprene can be readily polymerized to produce synthetic rubber. About 4 to 30 per cent of isopentane by volume of impure isoprene should be used in the distillation, depending on the efficiency of the fractionating column employed. Maleic anhydride is also added to the distilland in order to remove cyclopentadiene. The used isopentane, which comes over in the distillate, can be purified by mild catalytic hydrogenation, followed by stripping. Alternatively, the acetylenic compounds can be removed from the isopentane by means of selective solvents or adsorbents. In an example, commercial isoprene containing 2.5 volume per cent of dimethylacetylene and a small proportion of cyclopentadiene and other impurities was mixed with 9 per cent by weight of isopentane and 2 per cent of maleic anhydride; and the mixture was fractionated in a packed column, equivalent to 60 theoretical plates, employing a reflux ratio of 50. Removal of an overhead fraction was continued until substantially complete removal of dimethylacetylene and also of isopentane was accomplished. The purified isoprene was then dissolved in benzene and polymerized by means of tri-isobutyl aluminium and titanium tetrachloride. A yield of 88 per cent of polyisoprene was obtained based on the starting material.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US819188XA | 1956-05-03 | 1956-05-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB819188A true GB819188A (en) | 1959-09-02 |
Family
ID=22167235
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7239/57A Expired GB819188A (en) | 1956-05-03 | 1957-03-05 | Purifying isoprene by distillation |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB819188A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011075534A3 (en) * | 2009-12-18 | 2012-04-12 | Danisco Us Inc. | Purification of isoprene from renewable resources |
-
1957
- 1957-03-05 GB GB7239/57A patent/GB819188A/en not_active Expired
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011075534A3 (en) * | 2009-12-18 | 2012-04-12 | Danisco Us Inc. | Purification of isoprene from renewable resources |
CN102884028A (en) * | 2009-12-18 | 2013-01-16 | 丹尼斯科美国公司 | Purification of isoprene from renewable resources |
US8569562B2 (en) | 2009-12-18 | 2013-10-29 | Danisco Us Inc. | Purification of isoprene from renewable resources |
JP2015007119A (en) * | 2009-12-18 | 2015-01-15 | ダニスコ・ユーエス・インク | Purification of isoprene from renewable resource |
CN102884028B (en) * | 2009-12-18 | 2015-08-19 | 丹尼斯科美国公司 | Purification of isoprene from renewable resources |
US9751820B2 (en) | 2009-12-18 | 2017-09-05 | Danisco Us Inc. | Purification of isoprene from renewable resources |
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