GB817333A - Process of producing volatile products from residual oils - Google Patents

Abstract

<PICT:0817333/III/1> In a process of producing volatile products and coke from a residual oil the oil is contacted in a line 40 with particulate solids, preferably from a heating zone 27 heated to a temperature of 1300-1600 DEG F., whereby before entry into a separator 42 it is partly converted to volatile products and partly deposited on the particulate solids, solids from separator 42 pass into a coking zone 3 maintained solids from the heating zone 27 at a temperature of 1250-1400 DEG F. and are fluidized therein by gaseous hydrocarbons introduced through line 9 whereby the deposited portion of the oil is converted into coke and further volatile products which are withdrawn together with the volatile products from the separator 42 through line 17; coke is withdrawn through pipes 21 and 23, a portion being returned to the heating zone 27 through line 25. Some of the residual oil feed may be introduced directly into the coking zone and the gaseous hydrocarbons may comprise naphtha vapours, propane, butane, ethane or a mixture thereof in an amount of 1-10 weight per cent of residium feed. In some cases however the amount of gaseous hydrocarbons used may be 2-3 times the amount of the residium feed. The hot products leaving by line 17 are preferably quenched to 850-1100 DEG F. by means of water or an oil fraction introduced through line 19. The products recovered through line 17 amount to 75-82 weight per cent of the residium feed in addition to the products from the gaseous hydrocarbons employed for fluidizing. The products obtained based on residium feed include 8-20 volume per cent gasoline hydrocarbons boiling about 150-400 DEG F.; 2-10 volume per cent of a fraction boiling at about 400-700 DEG F. and 2-10 volume per cent of tar boiling above 700 DEG F. The process may be combined with a visbreaking treatment of a residual oil, the treatment producing a heavy tar which is then treated in the manner previously described. The visbreaking treatment may be effected at temperatures up to 850-1000 DEG F. pressures of at least 500 p.s.i.g. and for times of 1-30 minutes.ALSO:In a process of producing volatile products and coke from a residual oil the oil is contacted in a line 40 with particulate solids, preferably coke, from a heating zone 27 heated to a temperature of 1300-1600 DEG F. whereby before entry into a separator 42 it is partly converted to volatile products and partly deposited on the particulate solids, solids from separator 42 pass into a coking zone 3 maintained by solids from the heating zone 27 at a temperature of 1250-1400 DEG F. and are fluidized therein by gaseous hydrocarbons introduced through line 9 whereby the deposited portion of the oil is converted into coke and further volatile products which are withdrawn together with the volatile products from the separator 42 through line 17; coke is withdrawn through pipes 21 and 23, a portion being returned to the heating zone 27 through line 25. Some of the residual oil feed may be introduced directly into the coking zone and the gaseous hydrocarbons may comprise naphtha vapours, propane, butane, <FORM:0817333/IV (b)/1> ethane or a mixture thereof in an amount of 1-10 weight per cent of residium feed. In some cases, however, the amount of gaseous hydrocarbons used may be 2-3 times the amount of the residium feed. The hot products leaving by line 17 are preferably quenched to 850-1100 DEG F. by means of water or an oil fraction introduced through line 19. The products recovered through line 17 amount to 75-82 weight per cent of the residium feed in addition to hydrogen, methane and C2-C4 olefines and di-olefines from the fluidizing hydrocarbons. The products based on the residium feed include 30-50 weight per cent hydrogen and C1 to C3 hydrocarbons comprising ethylene, ethane, propylene and propane; 5-15 volume per cent C4 hydrocarbons comprising butadiene, butanes and butenes; 2-6 volume per cent C5 hydrocarbons comprising di-olefines isoprene, piperylene and cyclopentadiene and pentenes.