Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1977-02-28
1978-06-20
Crasanakis, George
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
26068358, 252411R, C07C 354
Patent
active
040961974
ABSTRACT:
An improved process for regenerating an alkylation catalyst comprising fluorosulfuric acid, said catalyst being at least partially deactivated, which comprises the method of:
(1) removing a portion of the fluorosulfuric acid from said catalyst by contacting same with a paraffin to form a liquid acid phase containing fluorosulfuric acid and an organic sludge formed during said alkylation and a gas phase containing said paraffin and fluorosulfuric acid;
(2) contacting the liquid acid phase formed in step (1) with water to form an acid-water mixture, thereby coverting at least a portion of the fluorosulfuric acid contained therein to hydrogen fluoride and sulfuric acid;
(3) removing at least a portion of the hydrogen fluoride from said acid-water mixture formed in step (2) by contacting same with a paraffin to form a gaseous phase containing hydrogen fluoride and paraffin; and
(4) treating the gas phases formed in steps (1) and (3) with sulfur trioxide to regenerate the fluorosulfuric acid.
In a preferred embodiment, at least a portion of the regenerated fluorosulfuric acid is recycled to the alkylation zone for use as an alkylation catalyst therein.
REFERENCES:
patent: RE29084 (1976-12-01), Anderson et al.
patent: 3349146 (1947-10-01), Witt
patent: 3766293 (1973-10-01), Parker et al.
patent: 3887635 (1975-06-01), Parker et al.
Crasanakis George
Ditsler John W.
Exxon Research & Engineering Co.
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