Patent GB-754041-A (GB)
Title: Improvements in or relating to hydroforming
IPC: C10G35/14
Filed: 1954-06-25
Abstract: <PICT:0754041/IV(a)/1> Naphtha containing sulphur is hydroformed by first contacting the naphtha at elevated temperature and pressure in a desulphurization zone containing a catalyst comprising a platinum group metal or molybdenum or compounds thereof, charging hydrogen to the desulphurization zone, allowing the naphtha to remain resident in said zone for a sufficient period of time to effect removal of the sulphur, withdrawing an effluent strem from said reaction zone substantially free from volatile sulphur compounds, and charging said effluent uncooled to a hydroforming zone containing a hydroforming catalyst maintaining the hydroforming zone at hydroforming conditions of temperature and pressure and contact time until the desired hydroforming reaction takes place. In a preferred apparatus, the desulphurizing reactor 1 contains a bed of fluidizing catalyst C. Feed gas which may be a naphtha boiling at 200-400 DEG  F. enters through line 12 together with a hydrogen-containing gas obtained from the product recovery system through line 12.  After hydrodesulphurization, the mixture of hydrogen and desulphurized oil vapours emerge from the dense fluidized bed C and pass through a dilute suspension of catalyst which extends from L to the top of reactor 1.  The gas then passes through cyclones S and separating devices S2 and S3 to remove entrained catalyst and the gases pass via line 14 to a bank of 3 hydroformer furnaces.  The catalyst from reactor 1 passes continuously into receiver 16 where it is treated with steam to remove feed oil through line 22 to regenerator 2 in which oxygen-bearing gas converts part of the sulphur into sulphur oxides which are removed overhead.  The catalyst is then withdrawn through line 23 and steam and recycle gas added through lines 24 and 26 respectively.  The catalyst is then regenerated in reducer 3 and water and sulphurated hydrogen removed overhead.  The desulphurization catalyst is molybdenum oxide on alumina or cobalt molybdate on alumina, and that for the hydroforming step is platinum on alumina.ALSO:In a process for hydroforming sulphurcontaining naphtha which comprises contacting the naphtha at elevated temperatures and pressures in a desulphurizing zone with hydrogen and a fluidized catalyst comprising a platinum group metal or molybdenum or a compound thereof, so that the sulphur is absorbed into the catalyst, withdrawing the desulphurized naphtha from the desulphurizing zone and transferring the desulphurized naphtha without cooling to a hydroforming zone as described in Group IV(b), the platinum catalyst used in the hydroforming step may be regenerated by passing diluted air therethrough at a temperature of about 1058-1100 DEG F. to burn off contaminating deposits.  The oxygen concentration of the regeneration gas may be 2-21 per cent. In addition oxygen alone may be used at 1060-1000 DEG F. for 2-24 hours under a pressure of 75 p.s.i.g.  In extreme cases the catalyst may be treated in situ with a mixture of aqueous nitric and hydrochloric acid at 50-200 DEG F. or by chlorine in a dry gas stream such as air at 600-1000 DEG F.