GB632291A - Improvements in methods of dehydrogenating aliphatic hydrocarbons - Google Patents
Improvements in methods of dehydrogenating aliphatic hydrocarbonsInfo
- Publication number
- GB632291A GB632291A GB15631/45D GB1563145D GB632291A GB 632291 A GB632291 A GB 632291A GB 15631/45 D GB15631/45 D GB 15631/45D GB 1563145 D GB1563145 D GB 1563145D GB 632291 A GB632291 A GB 632291A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dolomite
- limestone
- styrene
- carbonate
- carbon dioxide
- 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
- C07C5/32—Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with formation of free hydrogen
- C07C5/327—Formation of non-aromatic carbon-to-carbon double bonds only
- C07C5/333—Catalytic processes
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Catalysts (AREA)
Abstract
Aliphatic hydrocarbons are dehydrogenated by flowing the vapour in the presence of steam over a catalyst comprising granules of naturally-occurring carbonate of calcium or magnesium partially calcined to form a minor portion of oxides as an outer layer integral with a major, inner core portion of undecarbonated carbonate maintained at a dehydrogenating temperature and maintaining the said major portion (by weight) of the catalyst particles in the form of carbonate throughout the dehydrogenation reaction. The partially calcined granules may be regenerated in situ by periodically temporarily increasing the flow rate of steam thereover and thereby decreasing the partial pressure of carbon dioxide to less than the partial pressure of the carbonate compound core-like inner portions. The dehydrogenating temperature is preferably between 600 DEG and 650 DEG C. Dolomite, limestone, dolomitic limestone, and marble are preferred since magnesite and ferruginous dolomite have too high a partial pressure of carbon dioxide for core stability at the operating temperatures. Carbon dioxide, e.g. combustion products, may however, be introduced to correct this. The material may contain oxides of iron, silicon and aluminium and may be sprayed with suspensions of oxides of iron or nickel in a non-hydrous medium to increase activity or impregnated with a silica salt to form a fibrous skeleton which resists erosion. The granules preferably have a size lying between the 4 and 10 mesh per inch sieves and show 30-45 per cent loss of weight on complete calcination. Examples describe the dehydrogenation of ethyl benzene to styrene using limestone marble, dolomitic limestone and "Red Flux" ferruginous limestone; diethyl benzene to styrene and divinyl benzene using dolomitic limestone; isopropyl benzene to styrene and methyl styrene using dolomite; monoethyl naphthalene to vinyl naphthalene using dolomite. isobutene to isobutylene and propylene using dolomite. Specification 632,350 is referred to.ALSO:Aliphatic hydrocarbons are dehydrogenated by flowing the vapour in the presence of steam over a catalyst comprising granules of naturally-occurring carbonate of calcium or magnesium partially calcined to form a minor portion of oxides as an outer layer integral with a major inner core portion of undecarbonated carbonate maintained at a dehydrogenating temperature, and maintaining the said major portion (by weight) of the catalyst particles in the form of carbonate throughout the dehydrogenation reaction. The partially-calcined granules may be regenerated in situ by periodically temporarily increasing the flow rate of steam thereover and thereby decreasing the partial pressure of carbon dioxide to less than the partial pressure of the carbonate compound core-like inner portions. The dehydrogenating temperature is preferably between 600 DEG and 650 DEG C. Dolomite, limestone, dolomitic limestone, and marble are preferred since magnesite and ferruginous dolomite have two high a partial pressure of carbon dioxide for core stability at the operating temperatures. Carbon dioxide, e.g. combustion products, may, however, be introduced to correct this. The material may contain oxides of iron, silicon, and aluminium, and may be sprayed with suspensions of oxides of iron or nickel in a non-hydrous medium to increase activity or impregnated with a silica salt to form a fibrous skeleton which resists erosion. The granules preferably have a size lying between the 4 and 10 mesh per inch sieves and show 30-45 per cent loss of weight on complete calcination. Examples describe the dehydrogenation of ethyl benzene to styrene using limestone marble, dolomitic limestone and "Red Flux" ferruginous limestone; diethyl benzene to styrene and divinyl benzene using dolomitic limestone; isopropyl benzene to styrene and methyl styrene using dolomite; monoethyl naphthalene to vinyl naphthalene using dolomite; isobutene to isobutylene and propylene using dolomite. Specification 632,350, [Group III], is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US632291XA | 1943-12-31 | 1943-12-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB632291A true GB632291A (en) | 1949-11-21 |
Family
ID=22047824
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB15631/45D Expired GB632291A (en) | 1943-12-31 | 1945-06-19 | Improvements in methods of dehydrogenating aliphatic hydrocarbons |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB632291A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4513162A (en) * | 1981-08-18 | 1985-04-23 | Davy Mckee Aktiengesellschaft | Dehydrogenation process |
RU2773213C1 (en) * | 2020-09-17 | 2022-05-31 | Индиан Оил Корпорейшн Лимитед | Complex method for oxidative dehydrogenation of alkanes and hydrogen production |
-
1945
- 1945-06-19 GB GB15631/45D patent/GB632291A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4513162A (en) * | 1981-08-18 | 1985-04-23 | Davy Mckee Aktiengesellschaft | Dehydrogenation process |
RU2773213C1 (en) * | 2020-09-17 | 2022-05-31 | Индиан Оил Корпорейшн Лимитед | Complex method for oxidative dehydrogenation of alkanes and hydrogen production |
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