A PROCESS FOR THE PREPARATION OF 1,1,1,2-TETRAFLUOROETHANE

The invention relates to a process for preparing a co-precipitated Cr2O3/Al2O3 catalyst promoted by zinc, said process comprising co-precipitation of chromium and aluminum metal hydroxides from corresponding trivalent metal salt solutions using NH4OH, NaOH or KOH as a base and followed by calcinatio...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	VEERAMACHANENI, VIJAYAKUMAR, KONDAVETI, LEELAKRISHNA, SRIPATHI, NARAYAN, REDDY, RAO, JAMPANI, MADHUSUDANA, ATTALURI, SIVA, PRASAD, PAMULAPARTHY, SHANTHAN, RAO, NARASAIAH, BANDA, KUPPUSAMY, RADHAKRISHNAN, SRINIVAS, KOOSAMPALLY, SUKHADEORAO, PATIL, KAMALAKAR, YADLA, RAMBABU
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS GENERAL METHODS OF ORGANIC CHEMISTRY GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE THEIR RELEVANT APPARATUS TRANSPORTING
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	The invention relates to a process for preparing a co-precipitated Cr2O3/Al2O3 catalyst promoted by zinc, said process comprising co-precipitation of chromium and aluminum metal hydroxides from corresponding trivalent metal salt solutions using NH4OH, NaOH or KOH as a base and followed by calcination to give mixed oxide precatalyst in amorphous form which is impregnated with an activity promoting amount of Zinc compound. The catalyst is used for the preparation of HFL-134a by fluorination of trichloroethylene and fluorination of the intermediate product of the former reaction (HCFC-133A). L'invention concerne un procédé de préparation d'un catalyseur de Cr203/Al203 coprécipité favorisée par le zinc. Ce procédé consiste à coprécipiter des hydroxydes de chrome et de métal d'aluminium à partir de solutions de sel de métal trivalent, à l'aide de NH4OH, NaOH, ou KOH sous forme d'une base, puis à les calciner pour obtenir un précatalyseur d'oxyde mélangé sous forme amorphe. Ce dernier est imprégné d'une quantité de zinc favorisant l'activité. Ce catalyseur est utilisé pour préparer du HFL-134a par fluoration de trichloroéthylène et fluoration du produit intermédiaire de la réaction préalable (HCFC-133a).