Patent GB-482978-A (GB)
Title: Improvements relating to the manufacture of gasolene-like hydrocarbons by the polymerisation of cracking gases
IPC: C07C9/14
Filed: 1937-01-19
Abstract: Crude oils, naphthas, &c., are cracked and/or reformed and the products are separated into gasoline, heavy residues and gases, the gases are freed from hydrogen and methane and polymerized at temperatures of about 1000 DEG  F. to obtain liquid products suitable as motor fuel, the liquid products are separated from the residual gaseous products and the thus separated liquid and gaseous products are recycled separately to the cracking system after the cracking step where they are further processed in admixture with the cracked products.  Naphtha oil is fed by a pump 1 through preheater 3 to a cracking coil 4 the products passing into the lower portion 8 of a combined evaporator and fractionator 15 where the evaporation is controlled by introduction through pipe 10 of cool oil, which may be a clean distillate obtained by flashing the residues withdrawn through line 13.  The vapours evolved, after fractionation in the tower 15 to give a condensate collected on plate 14 which is recycled as cooling agent through line 20 to arrest the cracking, are condensed in cooler 26 and separated from gases in separator 28, the condensate being stabilized in column 35 and stabilized gasoline recovered through line 39.  The gaseous fractions freed in column 35 after cooling in cooler 41 are mixed with gaseous fractions from separator 28 in an accumulator 43 from which <PICT:0482978/III/1> the gaseous and liquid fractions are fed after compression separately into a gas stabilizer 63.  In this tower the gases are washed with reflux recycled through line 72, hydrogen and methane being recovered from the top of the tower, while a fraction collected on plate 76 is stabilized in a reboiler tower 78 and led off to an accumulator 83. This fraction, after purification from hydrogen sulphide in a tower 104 by washing with sodium hydroxide, phenolate, or thioarsenate solutions, is polymerized in a coil 123, heated in a furnace 124, and a soaker coil 121 in which heat is exchanged with the polymerization stock, the products passing into a separator 128 where the gaseous and liquid products are separated, the gases after separation of hydrogen and methane if required, being recycled through line 140 either to the separator 28 or the accumulator 43 while the liquids are fed through line 129 to mix with the cracked products in line 6.ALSO:<PICT:0482978/IV/1> Crude oils, naphthas &c., are cracked and/or reformed and the products are separated into gasoline, heavy residues and gases, the gases are freed from hydrogen and methane and polymerized at temperatures of about 1000 DEG  F. to obtain liquid products suitable as motor fuel, the liquid products are separated from the residual gaseous products and the thus separated liquid and gaseous products are recycled separately to the cracking system after the cracking step, where they are further processed in admixture with the cracked products.  Naphtha is fed by a pump 1 through preheater 3 to a cracking coil 4, the products passing into the lower portion 8 of a combined evaporator and fractionator 15 where the evaporation is controlled by introduction through pipe 10 of cool oil, which may be a clean distillate obtained by flashing the residues withdrawn through line 13.  The vapours evolved, after fractionation in the tower 15 to give a condensate collected on plate 14 which is recycled as cooling agent through line 20 to arrest the cracking, are condensed in cooler 26 and separated from gases in separator 28, the condensate being stabilized in column 35 and stabilized gasoline recovered through line 39.  The gaseous fractions freed in column 35 after cooling in cooler 41 are mixed with gaseous fractions from separator 28 in an accumulator 43 from which the gaseous and liquid fractions are fed after compression separately into a gas stabilizer 63.  In this tower the gases are washed with reflux recycled through line 72, hydrogen and methane being recovered from the top of the tower, while a fraction collected on plate 76 is stabilized in a reboiler tower 78 and led off to an accumulator 83.  This fraction after purification from hydrogen sulphide in a tower 104 by washing with sodium hydroxide, phenolate, or thioarsenate solutions, is polymerized in a coil 123, heated in a furnace 124, and a soaker coil 121 in which heat is exchanged with the polymerization stock, the products passing into a separator 128 where the gaseous and liquid products are separated, the gases after separation of hydrogen and methane if required, being recycled through line 140 either to the separator 28 or the accumulator 43 while the liquids are fed through line 129 to mix with the cracked products in line 6.