Patent GB-594009-A (GB)
Title: Improved process for the production of aviation gasoline
IPC: C07C9/14
Filed: 1945-01-17
Abstract: Aviation gasoline base is produced by subjecting gas oil to catalytic cracking, recovering from the products a fraction boiling in the aviation gasoline range, and reforming the fraction in the presence of added hydrogen and a catalyst comprising an oxide or sulphide of a metal of Group II, IV, V or VI.  Gas oil boiling in the range 400 to 800 DEG F. is fed through line 1 into heater 5 and is then passed to cracking zone 20 which contains a stationary bed of synthetic silica/alumina gel, or silica/magnesia gel, maintained at a temperature within the range 850 to 925 DEG F.  The products are fractionated, in column 35, into unconverted gas oil, kerosene, heads, and a C4-325 DEG F. fraction and this last is taken off through line 45.  The C4-325 DEG F. fraction is reheated, mixed with hydrogen-containing gas from line 53, and introduced into reforming zone 60 which contains a catalyst comprising 10 per cent. molybdenum oxide carried on 90 per cent. of zinc spinel, maintained at a temperature between 875 DEG  and 950 DEG F.; the pressure in the zone being maintained in the range 100 to 400 lbs. per sq. in.  The hydroformed gasoline is separated <PICT:0594009/III/1> from hydrogen-containing gas in drum 72 from which it is withdrawn through line 80 and passed, via reducing valve 82, to low-pressure separator 84 where C1 to C3 hydrocarbons are eliminated through line 85.  The gasoline is then fractionated in column 90, aviation base being taken off overhead and collected in receiver 100.  The hydrogen-containing gas withdrawn overhead from drum 72 is treated with light naphtha in scrubber S, in order to remove normally gaseous hydrocarbons, and is then returned to the reforming zone through line 76.  Chromium oxide is also referred to as a reforming catalyst, and charcoal as a support.  The fluid catalyst cracking technique may be used in the first step. Specification 543,970 is referred to.ALSO:Aviation gasoline base is produced by subjecting gas oil to catalytic cracking, recovering from the products a fraction boiling in the aviation gasoline range, and reforming the fraction in the presence of added hydrogen and <PICT:0594009/IV/1> a catalyst comprising an oxide or sulphide of a metal of Groups II, IV, V or VI.  In the reforming operation, naphthenes and some straight chain paraffins and olefins are converted to aromatics, and branched chain olefins are hydrogenated to isoparaffins.  Gas oil is catalytically cracked in zone 20 and the products are fractionated, in column 35, into unconverted gas oil, kerosene, heads, and a C4-325 DEG  F. fraction and this last is taken off through line 45.  The C4-325 DEG  F. is reheated, mixed with hydrogen-containing gas from line 53, and introduced into reforming zone 60 which contains a catalyst comprising 10 per cent molybdenum oxide supported on 90 per cent zinc spinel, maintained at a temperature between 875 DEG  and 950 DEG  F.; the pressure in the zone being in the range 100 to 400 lbs. per sq. inch.  The hydroformed gasoline is separated from hydrogen-containing gas in drum 72 from which it is withdrawn through line 80 and passed, via reducing valve 82, to low-pressure separator 84 where C1 to C3 hydrocarbons are eliminated through line 85.  The gasoline is then fractionated in column 90, aviation base being taken off overhead and collected in receiver 100.  The hydrogen-containing gas withdrawn overhead from drum 72 is treated with light naphtha in scrubber S, in order to remove normally gaseous hydrocarbons, and is then returned to the reforming zone through line 76.  Chromium oxide is also referred to as a catalyst, and charcoal as a support.  Specification 543,970 is referred to.