GB993223A - A method of isomerizing alkyl aromatic compounds - Google Patents
A method of isomerizing alkyl aromatic compoundsInfo
- Publication number
- GB993223A GB993223A GB1959663A GB1959663A GB993223A GB 993223 A GB993223 A GB 993223A GB 1959663 A GB1959663 A GB 1959663A GB 1959663 A GB1959663 A GB 1959663A GB 993223 A GB993223 A GB 993223A
- Authority
- GB
- United Kingdom
- Prior art keywords
- parts
- volume
- total
- per cent
- xylene
- 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
- C07C5/2724—Catalytic processes not covered by C07C5/2732 - C07C5/31; Catalytic processes covered by both C07C5/2732 and C07C5/277 simultaneously with metals
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Abstract
A non-equilibrium mixture of alkyl aromatic compounds is isomerized to near equilibrium concentration by contacting a hydrocarbon charge stock containing a mixture of close boiling isomeric alkyl aromatic compounds having 1 to 4 carbon atoms in each alkyl group in the presence of substantially dry hydrogen with a reduced acidic carrier-based platinum group metal catalyst at a total pressure of 100 to 500 p.s.i.g., a hydrogen partial pressure of 50 to 225 p.s.i.g., a weight hourly space velocity of 0.5 to 5, a ratio of 5 to 20 mols. of hydrogen per mol. of hydrocarbon charge stock, and a temperature of 750 DEG to 950 DEG F., the nitrogen content of the total feed entering the reaction system being maintained below that sufficient to provide 15 parts of ammonia per million parts by volume of total effluent. The water content of the total feed entering the reaction is maintained below 50 parts of water per million parts by volume of total feed in the vapour phase and the water content of effluent is maintained below 50 parts of water per million parts by volume of total effluent. Starting materials used may be of the benzene or naphthalene series e.g. a C8 fraction containing 1 to 30 vol. per cent ethylbenzene, 1 to 30 volume per cent o-xylene, 10 to 30 vol. per cent p-xylene and 40 to 88 vol. per cent m-xylene. The catalyst consists essentially of 0.1 to 2.0% by weight of a platinum group metal e.g. platinum palladium, rhodium and iridium. supported on alumina or magnesia containing at least one acidic component e.g. silica, boria, zirconia or mixtures thereof. Pure hydrogen i.e. that from a palladium type diffusion unit, can be employed for the reaction and ammonia can be removed by conventional means e.g. by passing through copper chloride. Specifications 735,390, 837,907 and 951,344 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US19594062A | 1962-05-18 | 1962-05-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB993223A true GB993223A (en) | 1965-05-26 |
Family
ID=22723464
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1959663A Expired GB993223A (en) | 1962-05-18 | 1963-05-16 | A method of isomerizing alkyl aromatic compounds |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1443786C3 (en) |
GB (1) | GB993223A (en) |
-
1963
- 1963-05-16 GB GB1959663A patent/GB993223A/en not_active Expired
- 1963-05-17 DE DE19631443786 patent/DE1443786C3/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1443786A1 (en) | 1968-12-19 |
DE1443786C3 (en) | 1973-09-13 |
DE1443786B2 (en) | 1973-02-22 |
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