Patent GB-616793-A (GB)
Title: Improvements in or relating to catalyst regeneration
IPC: B01J38/12
Filed: 1945-07-09
Abstract: In the regeneration of a bed of solid contact material having carbon deposited thereon, wherein a predetermined maximum regeneration temperature below that at which over-burning occurs is employed, using a regeneration gas comprising air and a diluent gas of substantially constant composition during regeneration, the carbon concentration, weight of diluent and initial regeneration temperature are correlated in accordance with an equation which takes into account such factors as the specific heat of the catalyst, the specific heat at constant pressure of the diluent, the heat of combustion of the carbon, the temperature difference between the desired maximum temperature and the initial regeneration temperature, the volume of flue gas produced, its specific heat at constant pressure and so on.  The carbon concentration must be above a specified minimum, generally about 2 per cent employing steam as the diluent.  Other diluents specified are nitrogen and flue gas. Regeneration pressures of 0-100 lbs./sq. in. are mentioned.  Examples are given, employing the equation: (i) showing the estimation of the amount of steam required for a regeneration; (ii) referring to the calculation of an air-steam ratio necessary for regeneration; (iii) referring to the calculation of the amount of carbon that may be deposited when a given set of regenerating conditions are to be employed; (iv) referring to the calculation of the temperature of the regeneration gas to be employed.  The catalytic processes concerned are (i) the cracking of gas oil, using bauxite at 1000 DEG  F.; (ii) the cracking-aromatizing of a polyformed gasoline at 1100 DEG  F. using a silica alumina catalyst; (iii) the cracking-aromatizing of a polyform gasoline employing a bauxite catalyst with steam as a diluent; (iv) the cracking of gas oil employing a silica-alumina catalyst.  Reference is made generally to the regeneration of catalysts used also in dehydrogenation, polymerization, reforming, cyclization, &c.ALSO:In the regeneration of a bed of solid contact material having carbon deposited thereon, wherein a predetermined maximum regeneration temperature below that at which overburning occurs is employed, using a regeneration gas comprising air and a diluent gas of substantially constant composition during regeneration, the carbon concentration, weight of diluent and initial regeneration temperature are correlated in accordance with an equation which takes into account such factors as the specific heat of the catalyst, the specific heat at constant pressure of the diluent, the heat of combustion of the carbon, the temperature difference between the desired maximum temperature and the initial regeneration temperature, the volume of flue gas produced, its specific heat at constant pressure and so on.  The carbon concentration must be above a specified minimum, generally about 2 per cent, employing strain as the diluent.  Other diluents specified are nitrogen and flue gas.  Regeneration pressures of 0-100 lbs./sq. in. are mentioned.  Examples are given, employing the equation: (i) showing the estimation of the amount of steam required for a regeneration; (ii) referring to the calculation of an air-stream ratio necessary for regeneration; (iii) referring to the calculation of the amount of carbon that may be deposited when a given set of regenerating conditions are to be employed; (iv) referring to the calculation of the temperature of the regeneration gas to be employed.  The catalytic processes concerned are the cracking-aromatizing of a polyformed gasoline at 1100 DEG  F., using a silica alumina catalyst and of a polyform gasoline employing a bauxite catalyst with steam as a diluent. Reference is made generally to the regeneration of catalysts used also in dehydrogenation, polymerization, reforming, cyclization, &c.