Abstract:
Hydrocarbons contaminated with carbon black, such as have been employed for quenching carbon-black-containing gases, are regenerated by passing them into contact with an indirectly heated and mechanically agitated bed of petroleum coke maintained at a temperature at least as high as the upper limit of the boiling range of the hydrocarbon. The separated carbon black may be withdrawn in the form of globular petroleum coke. The bed may be kept in motion by means of a stirrer or by employing an externally heated rotary kiln.ALSO:Carbon black prepared when hydrocarbons are cracked to produce synthesis gas &c., is washed from these gases with a hydrocarbon oil and the slurry formed passed to an externally heated, mechanically agitated bed of petroleum coke particles where the oil is vaporized and the carbon black withdrawn from the bed in the form of small globular particles.
Abstract:
In the production of olefins, e.g. ethylene and propylene, by cracking hydrocarbon oils autothermally in the presence of oxygen in a fluidized bed of oil coke there is added batchwise to the coke during the process a small amount e.g. 0.05-6% by weight of the coke of a substance containing phosphoric acid and/or boric acid and/or a salt thereof, e.g. by spraying or injection. Cracking is effected at 630-850 DEG C. and material in the product boiling above 250 DEG C. is recycled. The bed is fluidized with steam and/or carbon dioxide and the oxygen may be mixed with this or at least partly with the oil. Specification 933,301 is referred to.
Abstract:
In the production of olefins, e.g. ethylene and propylene, by cracking hydrocarbon oils autothermally in the presence of oxygen in a fluidized bed of oil coke there is added batchwise to the coke during the process a small amount e.g. 0.05-6% by weight of the coke of a substance containing phosphoric acid and/or boric acid and/or a salt thereof, e.g. by spraying or injection. Cracking is effected at 630-850 DEG C. and material in the product boiling above 250 DEG C. is recycled. The bed is fluidized with steam and/or carbon dioxide and the oxygen may be mixed with this or at least partly with the oil. Specification 933,301 is referred to.
Abstract:
In the production of olefins, e.g. ethylene and propylene, by cracking hydrocarbon oils autothermally in the presence of oxygen in a fluidized bed of oil coke there is added batchwise to the coke during the process a small amount e.g. 0.05-6% by weight of the coke of a substance containing phosphoric acid and/or boric acid and/or a salt thereof, e.g. by spraying or injection. Cracking is effected at 630-850 DEG C. and material in the product boiling above 250 DEG C. is recycled. The bed is fluidized with steam and/or carbon dioxide and the oxygen may be mixed with this or at least partly with the oil. Specification 933,301 is referred to.