Patent GB-761058-A (GB)
Title: Improvements relating to the catalytic reforming of petroleum hydrocarbons
IPC: C10G69/08
Filed: 1953-04-29
Abstract: In a process for the successive desulphurization and hydroforming of petroleum naphtha, the naphtha is passed downwardly through the desulphurization zone in admixture with a hydrogen-rich gas and in contact with a sulphur-resistant hydrogenation catalyst at an elevated temperature and pressure, and the desulphurized naphtha recovered from the products of the desulphurization zone is passed through the hydroforming zone in admixture with a hydrogen-rich gas and in contact with a hydroforming catalyst at an elevated temperature and pressure, the hydrogen-rich gas for use in the desulphurization zone being obtained from the products of the hydroforming zone and being supplied to the desulphurization zone in an amount just sufficient to maintain a slight excess of hydrogen therein.  The temperature in the desulphurization zone is kept appreciably below the temperature in the hydroforming zone, while the pressure in the desulphurization zone is kept sufficiently below the pressure in the hydroforming zone to maintain the downward flow in the desulphurization zone.  The hydrogenation catalyst employed in the desulphurization zone may comprise the oxides of cobalt and molybdenum incorporated with a support consisting essentially of alumina.  The hydroforming catalyst may be molybdenum trioxide on alumina, or a platinum group metal, if desired together with a halogen, on alumina.  Apparatus for carrying out the process of the invention is described.  In an example, petroleum naphtha is desulphurized in admixture with a hydrogen-rich gas and in contact with cobalt and molybdenum oxides supported on alumina at 650 DEG  F. inlet temperature and 600 lbs./sq. in. pressure.  The desulphurized naphtha is then hydroformed in contact with a catalyst containing platinum, fluorine, chlorine and alumina at 937 DEG  F. inlet temperature and 700 lbs./sq. in. pressure.  Of the hydrogen-rich gases obtained from the products of the hydroforming zone, some are supplied to the desulphurization zone and the rest are recycled to the hydroforming zone.  For comparison purposes, the operation of the hydroforming zone under the same conditions with a naphtha feed which has not been desulphurized is described.ALSO:In a process for the successive desulphurization and hydroforming of petroleum naphtha, the naphtha is passed downwardly through the desulphurization zone in admixture with a hydrogen-rich gas and in contact with a sulphur-resistant hydrogenation catalyst at an elevated temperature and pressure and the desulpherized naphtha recovered from the products of the desulphurization zone is passed through the hydroforming zone in admixture with a hydrogen rich gas and contact with a hydroforming catalyst at an elevated temperature and pressure, the hydrogen-rich gas for use in the desulphurization zone being obtained from the products of the hydroforming zone and being supplied to the desulphurization zone in an amount just sufficient to maintain a slight excess of hydrogen therein.  The temperature in the desulphurization zone is kept appreciably below the temperature in the hydroforming zone, while the pressure in the desulphurization zone is kept sufficiently below the pressure in the hydroforming zone to maintain the downward flow in the desulphurization zone.  The hydrogeneration catalyst employed in the desulphurization zone may comprise the oxides of cobalt and molybdenum incorporated with a support consisting essentially of alumina.  The hydroforming catalyst may be molybdenum trioxide on alumina, or a platinum group metal, if desired together with a halogen, on alumina.  Apparatus for carrying out the process of the invention is described.  In an example, petroleum naphtha is desulphurized in admixture with a hydrogen-rich gas and in contact with cobalt and molybdenum oxides supported on alumina at 650 DEG F. inlet temperature and 600 lbs. sq. in pressure. The desulphurized naphtha is then hydroformed in contact with a catalyst containing platinum, fluorine, chlorine and alumina at 937 DEG F. inlet temperature and 700 lbs./sq. in pressure of the hydrogen-rich gases obtained from the products of the hydroforming zone, some are supplied to the desulphurization zone and the rest are recycled to the hydroforming zone.  For comparison purposes, the operation of the hydroforming zone under the same conditions with naphtha feed which has not been desulphurized is described.