GB966704A - Process of dehydrogenation - Google Patents

Process of dehydrogenation

Info

Publication number
GB966704A
GB966704A GB4355260A GB4355260A GB966704A GB 966704 A GB966704 A GB 966704A GB 4355260 A GB4355260 A GB 4355260A GB 4355260 A GB4355260 A GB 4355260A GB 966704 A GB966704 A GB 966704A
Authority
GB
United Kingdom
Prior art keywords
catalyst
steam
alkyl aromatic
masses
heated
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
Application number
GB4355260A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Monsanto Co
Original Assignee
Monsanto Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US562A external-priority patent/US3118006A/en
Application filed by Monsanto Co filed Critical Monsanto Co
Publication of GB966704A publication Critical patent/GB966704A/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C5/00Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
    • C07C5/32Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with formation of free hydrogen
    • C07C5/327Formation of non-aromatic carbon-to-carbon double bonds only
    • C07C5/333Catalytic processes
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C5/00Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms
    • C07C5/32Preparation of hydrocarbons from hydrocarbons containing the same number of carbon atoms by dehydrogenation with formation of free hydrogen
    • C07C5/327Formation of non-aromatic carbon-to-carbon double bonds only
    • C07C5/333Catalytic processes
    • C07C5/3332Catalytic processes with metal oxides or metal sulfides

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

In the dehydrogenation of alkyl aromatic halohydrocarbons to a vinyl aromatic halohydrocarbon, the starting alkyl aromatic is passed with superheated steam through a plurality of fixed masses of a dehydrogenation catalyst and additional heat is supplied to the reactants between the catalyst masses without substantially increasing the reaction temperature. In one embodiment the whole of the superheated steam is mixed with the alkyl aromatic and the reaction mixture is heated by heat exchangers between the catalyst masses and in an alternative the steam is split into streams and a proportion added to the alkyl aromatic or reaction mixture before passing into each catalyst mass. The reaction temperature may be 600-650 DEG C. for which the steam in the first embodiment is heated to 750-825 DEG C. and in the second 725-775 DEG C. The total amount of steam may be 1.5-20 pounds per pound of alkyl aromatic and 2-5 catalyst beds may be used, arranged in a single reactor if desired. The catalyst may be Fe2O3-Cr2O3-K2CO3, Fe O-K2O, MgO-Fe O-K2CO3 or Al2O3-SiO2-Ni and the starting material ethylchlorobenzene.ALSO:In the dehydrogenation of alkyl aromatic hydrocarbons to a vinyl aromatic hydrocarbon the starting alkyl aromatic is passed with super-heated steam through a plurality of fixed masses of a dehydrogenation catalyst and additional heat is supplied to the reactants between the catalyst masses without substantially increasing the reaction temperature. In one embodiment the whole of the superheated steam is mixed with the alkyl aromatic and the reaction mixture is heated by heat exchangers between the catalyst masses and in an alternative the steam is split into streams and a proportion added to the alkyl aromatic or reaction mixture before passing into each catalyst mass. The reaction temperature may be 600-650 DEG C. for which the steam in the first embodiment is heated to 750-825 DEG C. and in the second 725-775 DEG C. The total amount of steam may be 1.5-20 pounds per pound of alkyl aromatic and 2-5 catalyst beds may be used, arranged in a single reactor if desired. The catalyst may be Fe2O3-Cr2O3-K2CO3, FeO-K2O, MgO-FeO -K2CO3 or Al2O3-SiO2-Ni and the starting material ethyl benzene, isopropylbenzene, diethylbenzene or ethylnaphthalene.
GB4355260A 1959-12-18 1960-12-19 Process of dehydrogenation Expired GB966704A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US86050859A 1959-12-18 1959-12-18
US562A US3118006A (en) 1960-01-05 1960-01-05 Dehydrogenation of alkylated aromatic hydrocarbons

Publications (1)

Publication Number Publication Date
GB966704A true GB966704A (en) 1964-08-12

Family

ID=26667818

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4355260A Expired GB966704A (en) 1959-12-18 1960-12-19 Process of dehydrogenation

Country Status (1)

Country Link
GB (1) GB966704A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2408726A4 (en) * 2009-03-17 2015-08-26 Lummus Technology Inc Method of providing heat for chemical conversion and a process and system employing the method for the production of olefin

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2408726A4 (en) * 2009-03-17 2015-08-26 Lummus Technology Inc Method of providing heat for chemical conversion and a process and system employing the method for the production of olefin

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