| 摘要 |
1436622 Selective hydrocracking BRITISH PETROLEUM CO Ltd 29 May 1974 [21 June 1973] 29473/73 Heading, C5E [Also in Division B1] A hydrocatalytic treatment of hydrocarbons utilizes a catalyst comprising a platinum group metal hydrogenating component and an acidresistant alkali-metal deficient zeolite support which is reactivated when it becomes deactiva. ted during use in the treatment by (a) burning coke deposits off the catalyst with a stream of inert gas and free oxygen at a temperature up to 550‹ C., (b) treating at 400-550‹ C. with a stream of inert gas containing 0À5-20% vol. free oxygen and 5-500 p.p.m. chlorine as chlorine, HCl or an organic chlorine-containing compound, (c) purging to remove residual oxygen and chlorine and (d) reducing in a stream of hydrogen at 200-600‹ C. The specified hydrocatalytic process is the selective hydrocracking of n-paraffins in hydrocarbon fractions, e.g. having more than 50% vol. of material boiling above 250‹ C. such as distillate fraction boiling in the range 250-600‹ C. The process conditions may include a temperature of of 232-510‹ C., a pressure of 17-210 bars, a space velocity of 0À2-20 v./v./hr. and a hydrogen gas rate of 7À5-225 mol./m.<SP>3</SP>. The use of the catalyst for cracking n-paraffins in gasoline fractions is also mentioned. |
