IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0831167
(1992-02-05)
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발명자
/ 주소 |
- Sikkenga David L. (Wheaton IL) Zaenger Ian C. (Wheaton IL) Williams Gregory S. (Tampa FL)
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| 출원인 / 주소 |
- Amoco Corporation (Chicago IL 02)
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| 인용정보 |
피인용 횟수 :
39 인용 특허 :
0 |
초록
A method for the acid catalyzed cyclization of an alkenylbenzene feedstock to a dimethyltetralin in a liquid phase reaction wherein the desired dimethyltetralin is removed from the reaction mixture by distillation simultaneously with the addition of the feedstock to the reaction mixture.
대표청구항
▼
An improved method for preparing one or more dimethyltetralins from 5-(o-, m-, or p-tolyl)-pent-1- or -2-ene or 5-phenyl-hex-1- or -2-ene as the alkenylbenzene feedstock, comprising: contacting the feedstock in liquid form with an acidic cyclization catalyst in a suitable reaction zone at a temperat
An improved method for preparing one or more dimethyltetralins from 5-(o-, m-, or p-tolyl)-pent-1- or -2-ene or 5-phenyl-hex-1- or -2-ene as the alkenylbenzene feedstock, comprising: contacting the feedstock in liquid form with an acidic cyclization catalyst in a suitable reaction zone at a temperature sufficient to provide for the cyclization of the feedstock thereby forming a liquid reaction mixture comprising the cyclization catalyst dispersed in the liquid reaction mixture, one or more dimethyltetralins and a heavy by-product produced during the cyclization reaction wherein (1) when the feedstock comprises 5-(o-tolyl)-pent-1- or -2-ene, at least 80 weight percent of the dimethyltetralin product formed is comprised of 1,5-, 1,6-, 2,5- or 2,6-dimethyltetralin, (2) when the feedstock comprises 5-(m-tolyl)-pent-1- or -2-ene, at least 80 weight percent of the dimethyltetralin product formed is comprised of 1,5-, 1,6-, 1,7-, 1,8-, 2,5-, 2,6-, 2,7- or 2,8-dimethyltetralin or a mixture thereof, (3) when the feedstock comprises 5-(p-tolyl)-pent-1- or -2-ene, at least 80 weight percent of the dimethyltetralin product formed is comprised of 1,7-, 1,8-, 2,7- or 2,8-dimethyltetralin or a mixture thereof, and (4) when feedstock comprises 5-phenyl-1- or -2-hexene, at least 80 weight percent of the dimethyltetralin product formed is comprised of 1,3-, 1,4-, 2,3-, 5,7-, 5,8- or 6,7-dimethyltetralin or a mixture thereof; and removing by distillation from the reaction mixture as overhead a lighter fraction comprising the dimethyltetralin product, wherein the distillation is conducted simultaneously with the addition of the feedstock to the reaction mixture.
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