GB609924A - Improvements in or relating to the manufacture of pyrazine - Google Patents

Improvements in or relating to the manufacture of pyrazine

Info

Publication number
GB609924A
GB609924A GB9196/46A GB919646A GB609924A GB 609924 A GB609924 A GB 609924A GB 9196/46 A GB9196/46 A GB 9196/46A GB 919646 A GB919646 A GB 919646A GB 609924 A GB609924 A GB 609924A
Authority
GB
United Kingdom
Prior art keywords
piperazine
copper
catalyst
cement
oxides
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
GB9196/46A
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.)
Rhone Poulenc SA
Original Assignee
Rhone Poulenc SA
Societe des Usines Chimiques Rhone Poulenc SA
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 Rhone Poulenc SA, Societe des Usines Chimiques Rhone Poulenc SA filed Critical Rhone Poulenc SA
Publication of GB609924A publication Critical patent/GB609924A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D241/00—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings
    • C07D241/02—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings not condensed with other rings
    • C07D241/10—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
    • C07D241/12—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/584—Recycling of catalysts

Abstract

Pyrazine is made by vapour phase dehydrogenation of piperazine in presence of a dehydrogenation catalyst such as copper, nickel, and oxides of zinc or cadmium, alone or together with one another or with chromic oxide. Carriers of neutral or basic character such as cement or oxides and carbonates of alkaline earth metals or magnesium may be used. Temperature is 250-550, preferably 300-450 DEG C., at atmospheric or reduced pressure. The piperazine may be diluted with inert gases such as steam or nitrogen. The catalyst can be regenerated by air oxidation, followed by reduction. In examples: (1) copper oxide pellets are reduced in hydrogen, and piperazine vapour and steam passed over at 440 DEG C.; (2) a catalyst prepared by precipitation with soda from a solution of copper and cadmium nitrates in presence of magnesia, impregnation with potassium carbonate, pelleting with cement, and drying, is treated with hydrogen at 300-350 DEG C., and then used at 335-345 DEG C. as in (1). Specification 387,507 is referred to.
GB9196/46A 1945-04-11 1946-03-25 Improvements in or relating to the manufacture of pyrazine Expired GB609924A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR609924X 1945-04-11

Publications (1)

Publication Number Publication Date
GB609924A true GB609924A (en) 1948-10-08

Family

ID=8977058

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9196/46A Expired GB609924A (en) 1945-04-11 1946-03-25 Improvements in or relating to the manufacture of pyrazine

Country Status (1)

Country Link
GB (1) GB609924A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3005820A (en) * 1961-10-24 Certificate of correction
DE1130810B (en) * 1958-11-17 1962-06-07 Wyandotte Chemicals Corp Process for the production of pyrazine, methyl and aethylpyrazines
WO1988000189A1 (en) * 1986-07-08 1988-01-14 Bracco Industria Chimica S.P.A. A process for the preparation of nitrogen-containing heterocyclic compounds

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3005820A (en) * 1961-10-24 Certificate of correction
DE1130810B (en) * 1958-11-17 1962-06-07 Wyandotte Chemicals Corp Process for the production of pyrazine, methyl and aethylpyrazines
WO1988000189A1 (en) * 1986-07-08 1988-01-14 Bracco Industria Chimica S.P.A. A process for the preparation of nitrogen-containing heterocyclic compounds

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