GB675836A - A process for the isomerisation of xylenes and the resulting xylenes - Google Patents
A process for the isomerisation of xylenes and the resulting xylenesInfo
- Publication number
- GB675836A GB675836A GB414/51A GB41451A GB675836A GB 675836 A GB675836 A GB 675836A GB 414/51 A GB414/51 A GB 414/51A GB 41451 A GB41451 A GB 41451A GB 675836 A GB675836 A GB 675836A
- Authority
- GB
- United Kingdom
- Prior art keywords
- xylene
- mixture
- rich
- isomerized
- xylenes
- 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
- C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
- C07C5/22—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by isomerisation
- C07C5/27—Rearrangement of carbon atoms in the hydrocarbon skeleton
- C07C5/2702—Catalytic processes not covered by C07C5/2732 - C07C5/31; Catalytic processes covered by both C07C5/2732 and C07C5/277 simultaneously
- C07C5/2705—Catalytic processes not covered by C07C5/2732 - C07C5/31; Catalytic processes covered by both C07C5/2732 and C07C5/277 simultaneously with metal oxides
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C5/00—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
- C07C5/22—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by isomerisation
- C07C5/27—Rearrangement of carbon atoms in the hydrocarbon skeleton
- C07C5/2729—Changing the branching point of an open chain or the point of substitution on a ring
- C07C5/2732—Catalytic processes
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Xylenes are isomerized by contacting with from 0.2-6 moles. of steam or hydrogen per mole. of xylene at about 427-593 DEG C. and a liquid hourly space velocity of about 1-16, in the presence of a clay type cracking catalyst. Preferably ethyl benzene is also added. Acid treated clays or synthetic materials comprising silica with alumina, magnesia, zirconia or boric oxide are suitable catalysts. Any pressure, e.g. atmospheric up to 500 atm. or more, may be used. A mixture of isomers approaching the equilibrium composition may be treated to remove part of the o-xylene, e.g. by superfractionation, and part of the p-xylene by crystallization, the m-xylene rich mixture then being isomerized to produce o and p. The effect of various concentrations of steam and hydrogen on the isomerization is illustrated. Where concentrations of ethyl benzene above the equilibrium, e.g. up to 40 per cent, are present, it may be separated from the product and recycled. Thus, when producing o-xylene from a mixture rich in m, the feed may be blended with an o-rich product containing ethyl benzene above the equilibrium, and part of the o-xylene separated from the blend. The remainder is isomerized to give an o-rich mixture which is blended with the initial mixture. The addition of olefins is detrimental to the isomerization.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US675836XA | 1950-01-09 | 1950-01-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB675836A true GB675836A (en) | 1952-07-16 |
Family
ID=22077010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB414/51A Expired GB675836A (en) | 1950-01-09 | 1951-01-05 | A process for the isomerisation of xylenes and the resulting xylenes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB675836A (en) |
-
1951
- 1951-01-05 GB GB414/51A patent/GB675836A/en not_active Expired
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