GB423324A - Improvements in and relating to the production of hydrocarbon motor fuels - Google Patents

Abstract

<PICT:0423324/III/1> Motor fuels are prepared from hydrocarbon distillates, obtained by a cracking process, by subjecting the vaporized distillate to a fractional condensation so as to obtain a light and a heavy distillate, these being subjected respectively to purification with an adsorptive material and an acid after which they are mixed to produce a fuel having a high anti-knock value. As shown, vapours from a vapourphase cracking plant pass into a fractionating tower 1 by a pipe 2, the light ends, boiling point 40 to 180 DEG C., passing off by a pipe 30 to a condenser 31, and the heavy ends, boiling from 150 to 230 DEG C., passing by a pipe 6, a condenser 7 and a pipe 8 to an acid treating vessel 9. By a pipe 12 the oil passes to a centrifugal separator 14 and thence to a clay treating vessel 16 and a filter 18. From the filter it may pass to a pipe 28 by a pipe 29 or to a re-run still 22 and an evaporator 23 from which the heavy ends pass away by a pipe 24 and vapours pass to a condenser 25 and a receiver 26, a pump 27 forcing it to the pipe 28 to which also the purified light distillate is conveyed by a pipe 66. The light distillate is made up from uncondensed vapours and gases which are conveyed from the column 1 by a pipe 30 to a condenser 31 and thence to a separator 33 whence part is returned by a pipe 37 to the column 1 and the remainder leaves by a pipe 38. Uncondensed vapours and gases pass from the separator 33 by a pipe 34 to a compressor 39, a cooler 40 and a separator 41 whereby a fraction boiling between 30 and 120 DEG C., is fed to the pipe 38 to be combined in a pipe 43 with the light distillate from the separator 33. Gases from the separator 41 pass to a caustic washing tower 45 after which they are compressed by a pump 48 and polymerized in a furnace 49 and a reaction coil 50 from which the vapours are separated and delivered to a cooler 56 and a receiver 57 whence the condensate passes to the pipe 43. The combined light distillates then pass to the clay treatment where they may be vaporized in a furnace 63 and pass to the clay treating vessel 64. From the vessel 64, the light distillates are conveyed by the pipe 66 to be combined in a pipe 67 with the heavy distillate from the pipe 28. Final traces of acid are removed by treatment with an alkali wash in a contactor 68 whence the blended distillates are conveyed by a pipe 71 to a mixing chamber 73 where the distillates may be combined with a gum inhibitor from a reservoir 76. If desired the distillates may also be combined in the mixer 73 with straight run gasoline from a tank 78.