PROCESS FOR MAKING TETRAFLUOROPROPENE

PROCESS FOR MAKING TETRAFLUOROPROPENE

The present invention describes a process for making CF 3 CH=CHF (HFO-1234ze). The process involves the addition of carbon tetrachloride (CCl 4 ) to 1,2-dichloroethylene to form CCl 3 CHClCHCl 2 . The compound CCl 3 CHClCHCl 2 thus can then either be treated with HF to produce CF 3 CHClCHClF as the...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: POSS, Andrew Joseph, NALEWAJEK, David, NAIR, Haridasan K, SINGH, Rajiv Ratna
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
THEIR RELEVANT APPARATUS
TRANSPORTING
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Beschreibung
Zusammenfassung:The present invention describes a process for making CF 3 CH=CHF (HFO-1234ze). The process involves the addition of carbon tetrachloride (CCl 4 ) to 1,2-dichloroethylene to form CCl 3 CHClCHCl 2 . The compound CCl 3 CHClCHCl 2 thus can then either be treated with HF to produce CF 3 CHClCHClF as the main product, or it can be converted to CCl 2 =CHCHCl 2 (1230za) by dechlorination. CCl 2 =CHCHCl 2 can be treated with HF such that the main product obtained is CF 3 CHClCHClF. CF 3 CH=CHCl may be produced as a byproduct, but upon treatment with HF, it affords the compound CF 3 CHClCHClF. The desired compound, CF 3 CH=CHF (HFO-1234ze), is obtained as a trans/cis mixture by dehydrochlorination of CF 3 CH 2 CHClF or by dechlorination of CF 3 CHClCHClF.