17-01-2019 дата публикации
Номер: US20190016648A1
The present invention describes a process for fractionating the gaseous fraction leaving overhead from the fractionation column of a catalytic cracking unit (FCC) using a unit for the conversion of ethylene into propylene, in order to upgrade the ethylene contained in the fuel gas. 1. A device for fractionating the gaseous fraction leaving the head of the fractionation column of a catalytic cracking unit , the fraction containing LPG , light gasoline , and a residual gas termed “fuel gas” which itself contains a certain quantity of ethylene , the device comprising:{'b': 6', '15', '10, 'a first absorption section () which can be used to separate the fuel gas () and the light gasoline and LPG stream (), said section being present in an existing catalytic cracking unit,'}{'b': 22', '15, 'a unit () for the catalytic conversion of ethylene into propylene and other products of interest, wherein the feed is constituted by the fuel gas (), in which a large portion of the ethylene is essentially converted into propylene and also into aromatics and other products of interest, in the presence of a catalyst based on zeolite,'}{'b': 31', '22', '31', '11, 'a novel absorption section () which admits the effluents from the conversion unit () after recompression, the propylene, butene and the gasoline fractions contained in said effluents being recovered in said novel absorption section (), by using the gasoline arriving from the existing debutanizer (),'}{'b': 16', '33', '31, 'a second absorption section (), which admits the gas () obtained from the novel absorption section (),'}{'b': 35', '34', '31', '36', '37, 'a debutanization section () which admits the LPG and gasoline fractions () obtained from the novel absorption section () and which produces a stabilized gasoline () and a light LPG fraction ().'}222223227224223227225227228. The device for fractionating the gaseous fraction leaving the head of the fractionation column of a catalytic cracking unit as claimed in claim 1 , in ...
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