US7982074: 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 calcination to give mixed oxide precatalyst in amorphous from which is impregnated with an activity promoting amount of Zinc compound. The catalyst is used for the preparation of HFC-134a by fluorination of trichloroethylene and fluorination of intermediate of the former reaction (HCFC-133a).
Filing Date: 22-12-2006
Issue Date: 19-07-2011
Applicant: CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad
Patent No: US7982074
Application No: 11/643767
Inventor(s): Rao, Jampani Madhusudana (Andhra Pradesh, In); Rao, Shanthan Pamulaparthy (Andhra Pradesh, In); Prasad, Siva Attaluri (Andhra Pradesh, In); Narasaiah, Banda (Andhra Pradesh, In); Reddy, Narayan Sripathi (Andhra Pradesh, In); Kuppusamy, Radhakrishnan (Andhra Pradesh, In); Veeramachaneni, Vijayakumar (Andhara Pradesh, In); Sukhadeorao, Patil Kamalakar (Andhra Pradesh, In); Yadla, Rambabu (Andhra Pradesh, In); Srinivas, Koosampally (Andhra Pradesh, In); Kondaveti, Leelakrishna (Andhra Pradesh, In)
IPC Classification: C07C 19/08 , C07C 17/21, C07C 17/20
Country: United States of America