GB959609A - Dealkylation of alkyl benzenes - Google Patents
Dealkylation of alkyl benzenesInfo
- Publication number
- GB959609A GB959609A GB7362A GB7362A GB959609A GB 959609 A GB959609 A GB 959609A GB 7362 A GB7362 A GB 7362A GB 7362 A GB7362 A GB 7362A GB 959609 A GB959609 A GB 959609A
- Authority
- GB
- United Kingdom
- Prior art keywords
- catalyst
- chromia
- reaction
- conversion
- gauge
- 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
- C07C4/00—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms
- C07C4/08—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms by splitting-off an aliphatic or cycloaliphatic part from the molecule
- C07C4/12—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms by splitting-off an aliphatic or cycloaliphatic part from the molecule from hydrocarbons containing a six-membered aromatic ring, e.g. propyltoluene to vinyltoluene
- C07C4/14—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms by splitting-off an aliphatic or cycloaliphatic part from the molecule from hydrocarbons containing a six-membered aromatic ring, e.g. propyltoluene to vinyltoluene splitting taking place at an aromatic-aliphatic bond
- C07C4/18—Catalytic processes
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2521/00—Catalysts comprising the elements, oxides or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium or hafnium
- C07C2521/02—Boron or aluminium; Oxides or hydroxides thereof
- C07C2521/04—Alumina
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2523/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00
- C07C2523/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group C07C2521/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- C07C2523/24—Chromium, molybdenum or tungsten
- C07C2523/26—Chromium
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Catalysts (AREA)
Abstract
The dealkylation of C7 or C8 alkyl benzenes is effected in at least one reaction zone containing a chromia-alumina catalyst in the presence of hydrogen in an amount sufficient to maintain a hydrogen to hydrocarbon mol. ratio of at least 4 : 1 throughout the reaction and at a temperature at the exit of each or the reaction zone of 590-660 DEG C., the catalyst containing 15-25% of chromia and having a conversion activity in the dehydrogenation of butane at 593 DEG C., 127 mm. Hg absolute and 1 vol./vol./hr. of at least 2.4. (Conversion activity <FORM:0959609/C3/1> where C is the weight per cent conversion divided by 100). The catalyst base to obtain the necessary conversion activity is obtained by dehydration of hydrous alumina containing at 50% and preferably more than 75% of beta trihydrate form and by adjusting its surface area to 80-300 m.2/g. before impregnation. The dealkylation is preferably effected in a number of reactors containing catalyst in series with intermediate cooling of the reactants, e.g. by injection of cool recycle hydrocarbons, fresh feed or product or by indirect heat exchange, the inlet temperature to each zone being 510-593 DEG C. The total pressure will be 35-105 kg./cm.2 gauge and the hydrogen partial pressure should be at least 24.5 kg./cm.2 gauge at the outlet of the final reactor or at least 28 kg./cm.2 gauge at the inlet. The space velocity is adjusted to obtain a total reaction time of 1-3 minutes and sufficient reactors are used to ensure conversion of at least 50% of the feed, e.g. of toluene to benzene or of C8 hydrocarbons to toluene and/or benzene. The catalyst activity is preferably such that the reaction constant kT is given by <FORM:0959609/C3/2> in which R is the gas constant and T the absolute temperature.ALSO:A chromia-alumina catalyst for use in de-alkylating alkyl aromatic hydrocarbons is prepared by dehydration of a hydrous alumina containing at least 50% and preferably more than 75% of beta trihydrate form and adjusting its surface area by heat treatment, e.g. in steam, to 80-300 m.2/g. before impregnation. The calcined chromia-alumina catalyst has a surface area of 50-150 m.2/g.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US7990560A | 1960-12-30 | 1960-12-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB959609A true GB959609A (en) | 1964-06-03 |
Family
ID=22153557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7362A Expired GB959609A (en) | 1960-12-30 | 1962-01-01 | Dealkylation of alkyl benzenes |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1418894A1 (en) |
| GB (1) | GB959609A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113150824A (en) * | 2021-04-02 | 2021-07-23 | 福建省格兰尼生物工程股份有限公司 | Cardanol hydrotreating method |
-
1961
- 1961-12-30 DE DE19611418894 patent/DE1418894A1/en active Granted
-
1962
- 1962-01-01 GB GB7362A patent/GB959609A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113150824A (en) * | 2021-04-02 | 2021-07-23 | 福建省格兰尼生物工程股份有限公司 | Cardanol hydrotreating method |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1418894B2 (en) | 1974-02-28 |
| DE1418894A1 (en) | 1968-12-12 |
| DE1418894C3 (en) | 1974-10-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Kaeding et al. | Shape-selective reactions with zeolite catalysts: VI. Alkylation of benzene with propylene to produce cumene | |
| US5053572A (en) | Multistage ethylbenzene dehydrogenation process with split-flow hydrocarbon feed | |
| GB1384916A (en) | Reacation zone control | |
| GB945629A (en) | Combined steam cracking and hydrodealkylation process | |
| SU507223A3 (en) | Method for producing alkenyl aromatic hydrocarbons | |
| US2831907A (en) | Production of styrene and related compounds | |
| US4599473A (en) | Process for para selective alkylation of aromatic hydrocarbons | |
| GB959609A (en) | Dealkylation of alkyl benzenes | |
| US2860173A (en) | Manufacture of isopropyl benzene by alkylation | |
| GB1191164A (en) | Catalytic Dehydrogenation of Hydrocarbons | |
| GB1126175A (en) | Improvements in or relating to non-catalytic hydrodealkylation of alkyl substituted aromatics | |
| US3644551A (en) | Single stage cyclodimerization of olefins | |
| US3100807A (en) | Dehydrogenation of alkylated aromatic hydrocarbons | |
| US3769237A (en) | Oxidant-catalyst mixture of bismuth oxide and chromia-alumina | |
| US3201487A (en) | Aromatic alkylation with a silicaalumina-chromia catalyst | |
| US2495700A (en) | Silica-alumina-nickel dehydrogenation catalyst | |
| US3104268A (en) | Alkylation of aromatics with a zinc oxide, chromium oxide, copper oxide, silica-alumina catalyst | |
| US3293315A (en) | Alkylation process and catalyst therefor | |
| US3284522A (en) | Cyclohexane production | |
| US3410920A (en) | Dehydrogenation processes | |
| GB999869A (en) | A process for preparing diolefins and aromatic hydrocarbons | |
| US3417148A (en) | Alkylation process | |
| US3169999A (en) | Aromatic alkylation process utilizing a nickel-chromia-silica-alumina catalyst | |
| US2385187A (en) | Synthesis of ethyl benzene | |
| US3330878A (en) | Process for producing styrene |