Patent GB-491992-A (GB)
Title: Improvements in or relating to the production of benzines and aromatic hydrocarbons by the treatment of hydrocarbon oils at elevated temperatures
IPC: C07C15/00
Filed: 1937-06-08
Abstract: <PICT:0491992/III/1> Anti-knock benzines and aromatic hydro-carbons are produced from paraffin hydro-carbons boiling between about 150 and 350 DEG  C. by vaporizing the hydrocarbons and subjecting the vapours in three separate stages to temperatures of 480-520 DEG , 600-620 DEG , and 720-780 DEG  C. respectively, the whole of the products of a previous stage being passed to the following stage with the exception of small quantities which may be withdrawn for testing purposes. Lamp petroleum is passed from a reservoir R through a pipe l into a vaporizing coil A in the upper portion of a furnace I and thence through an insulated pipe a provided with a pyrometer into the first-stage reaction coil B heated to 480-520 DEG  C.  The products are then passed through systems of parallel tubes C, D arranged in a furnace II and comprising the second and third stages. Fractions may be withdrawn for testing after the first or second stages, e.g. by withdrawal through a valve r2 and cooled coil g to separator L.  The products pass through a tar separator E and cooling coil F to a separator G from which uncondensed vapours and gases pass through a cooler H to absorber J.  The liquid polymerizate obtained is distilled up to 200 DEG  C. to give a fraction containing 70 per cent aromatics and 4 per cent olefines with an octane number of 88, and a fraction boiling between 200 and 270 DEG  C. which can be recycled to the process.ALSO:<PICT:0491992/IV/1> Anti-knock benzines and aromatic hydrocarbons are produced from paraffins boiling between about 150 and 350 DEG  C. by subjecting the vapours in three separate stages to temperatures of 480-520 DEG , 600-620 DEG , and 720-780 DEG  C. respectively, substantially the whole of the products of a previous stage being passed to the following stage.  In the first stage, the main reaction is conversion to olefines, in the second, further conversion to cycloolefines, and in the third, conversion of cycloolefines to aromatics, with some polymerization of gaseous olefines formed in preceding stages. Lamp petroleum is passed from a reservoir R through a pipe l into a vaporizing coil A in the upper portion of a furnace I and thence through an insulated pipe a provided with a pyrometer into the first stage reaction coil B heated to 480-520 DEG  C.  The products are then passed through systems of parallel tubes C, D arranged in a furnace II and comprising the second and third stages. Fractions may be withdrawn for testing after the first or second stages, e.g. by withdrawal through a valve r2 and cooler g to separator L.  The products pass through a tar separator E and cooling coil F to a separator G from which uncondensed vapours and gases pass through a cooler H to absorber J.  The liquid polymerizate is distilled up to 200 DEG  C. to give a fraction containing 70 per cent aromatics and 4 per cent olefines with an octane number of 88, and a fraction boiling between 200 and 270 DEG C. which can be recycled to the process.