FR2322116A1 - Activation of alkyl aromatic dehydrogenation catalysts - by intermittently stopping hydrocarbon feed but maintaining steam flow - Google Patents

Activation of alkyl aromatic dehydrogenation catalysts - by intermittently stopping hydrocarbon feed but maintaining steam flow

Info

Publication number
FR2322116A1
FR2322116A1 FR7526276A FR7526276A FR2322116A1 FR 2322116 A1 FR2322116 A1 FR 2322116A1 FR 7526276 A FR7526276 A FR 7526276A FR 7526276 A FR7526276 A FR 7526276A FR 2322116 A1 FR2322116 A1 FR 2322116A1
Authority
FR
France
Prior art keywords
oxide
hydrocarbon
feed
steam
activation
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.)
Granted
Application number
FR7526276A
Other languages
French (fr)
Other versions
FR2322116B1 (en
Inventor
Frederick John Soderquist
Theodore Thaddeus Wazbinski
Nathan Waldma
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.)
Dow Chemical Co
Original Assignee
Dow Chemical 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
Application filed by Dow Chemical Co filed Critical Dow Chemical Co
Priority to FR7526276A priority Critical patent/FR2322116A1/en
Publication of FR2322116A1 publication Critical patent/FR2322116A1/en
Application granted granted Critical
Publication of FR2322116B1 publication Critical patent/FR2322116B1/fr
Granted legal-status Critical Current

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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
    • C07C5/3332—Catalytic processes with metal oxides or metal sulfides

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

Abstract

Method of maintaining activity of self-regenerating dehydrogenation catalysts used for converting alkyl aromatic hydrocarbons (1-2 rings and 1-2 2-3 c alkyl groups) into corresponding alkenyl groups by passing mixt. of steam and feed over catalyst at 600-700 degrees C. Comprises intermittent (7-30 mins in each 24-48 hrs) stopping of hydrocarbon feed and maintaining flow of steam: little or no carbon oxides are made during the activation period. The cycles are then repeated. After treatment flow of hydrocarbon is resumed. The catalyst compsns. are known (US 3205179 and 3703593) and activation procedure is applicable to those catalysts contg. major amts. of at least one oxide of Fe, Zn, Cr or Mg, various amts. of alkali metal (pref. K) oxide, hydroxide carbonate, and Cr cpds. as promoter. Typical catalyst compsns. are (a) 62.5-87.9% wt. Fe2O3, 2-2.5% wt. Cr2O3 and 9.6-35.3% wt. K2O or K2CO3 and opt. about 3.5% wt. V2O5, (b) 24.8-30% wt. each of Fe2O3 and ZnO, 5-30% wt. K oxide, hydroxide or carbonate, 5-10% wt. Cu, Cd, Ag or Th oxide, 5-10% wt. alkali metal chromate and 1-5% wt. refratocry cement, and (c) 23.6% wt. ferric oxide hydrate, 35.3% anhydrous ferric oxide, 16.7% K2CO3, 2.5% K2Cr2O7, 2.5% V2O5, 2.8% cement, 8.3% methyl cellulose and 8.3% graphite. Typically process is applied to dehydrogenation of ethyl benzene with feed contg. 0.4-1 pt. steam per part hydrocarbon and to dehydrogenation of diethylbenzene with feed contg. 1.5-6 pts. steam per pt. hydrocarbon.
FR7526276A 1975-08-26 1975-08-26 Activation of alkyl aromatic dehydrogenation catalysts - by intermittently stopping hydrocarbon feed but maintaining steam flow Granted FR2322116A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7526276A FR2322116A1 (en) 1975-08-26 1975-08-26 Activation of alkyl aromatic dehydrogenation catalysts - by intermittently stopping hydrocarbon feed but maintaining steam flow

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7526276A FR2322116A1 (en) 1975-08-26 1975-08-26 Activation of alkyl aromatic dehydrogenation catalysts - by intermittently stopping hydrocarbon feed but maintaining steam flow

Publications (2)

Publication Number Publication Date
FR2322116A1 true FR2322116A1 (en) 1977-03-25
FR2322116B1 FR2322116B1 (en) 1980-03-14

Family

ID=9159350

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7526276A Granted FR2322116A1 (en) 1975-08-26 1975-08-26 Activation of alkyl aromatic dehydrogenation catalysts - by intermittently stopping hydrocarbon feed but maintaining steam flow

Country Status (1)

Country Link
FR (1) FR2322116A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0188069A1 (en) * 1984-12-14 1986-07-23 Mobil Oil Corporation Iron oxide catalysts containing copper and zinc compounds and process for dehydrogenating para-ethyltoluene using such catalysts

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0188069A1 (en) * 1984-12-14 1986-07-23 Mobil Oil Corporation Iron oxide catalysts containing copper and zinc compounds and process for dehydrogenating para-ethyltoluene using such catalysts

Also Published As

Publication number Publication date
FR2322116B1 (en) 1980-03-14

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