Avoiding pollution by HF catalyst residues in alkylation

Details Avoiding pollution by HF catalyst residues in alkylation Avoiding pollution by HF catalyst residues in alkylation

1975-04-11

1976-08-03

Crasanakis, G. J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 354

Patent

active

039729567

ABSTRACT:
A used HF catalyst rerun unit comprises in tandem at least two strippers, a first to remove substantially all readily vaporizable components, e.g., light hydrocarbons and HF, and to separate acid-soluble oils as a liquid residue, and a second to produce rerun HF vapors and a stream of water containing HF. In an alkylation of a hydrocarbon operation, e.g., an isoparaffin by an olefin, said stream is used by reaction with an olefin to produce alkyl fluoride which can be fed to the alkylation reaction. Either before or after such reaction the stream is used to remove from noncondensible gas, as in a vent gas absorber, HF vapors therein contained and the stream returned to the HF rerun unit.

REFERENCES:
patent: 3751517 (1973-08-01), Hutson, Jr. et al.
patent: 3763265 (1973-10-01), Hutson, Jr. et al.
patent: 3767726 (1973-10-01), Hutson, Jr. et al.
patent: 3845158 (1974-10-01), Sobel
patent: 3886220 (1975-05-01), Carter
patent: 3911044 (1975-10-01), Carter

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