26-07-2018 дата публикации
Номер: US20180208853A1
Принадлежит:
The present invention relates to delayed coking of heavy petroleum residue producing petroleum coke and lighter hydrocarbon products. The invented process utilize a pre-cracking reactor and a reactor furnace for mild thermal cracking of the feedstock and an intermediate separator, before being subjected to higher severity thermal cracking treatment in a coker furnace and a coking drums, resulting in reduction in overall coke yield. 1. A method of reducing overall coke yield said method comprising the steps of:{'b': 1', '20', '40', '59', '2', '21', '41', '60', '3', '22', '42', '61, '(a) heating a hydrocarbon feedstock [, , , ] in a reactor furnace [, , , ] to obtain hot feed [, , , ];'}{'b': 3', '22', '42', '61', '4', '23', '24', '43', '62', '5', '25', '44', '63, '(b) introducing the hot feed [, , , ] of step (a) in a pre-cracking reactor [, , , , ] wherein it undergoes mild thermal cracking reactions to obtain an outlet product material stream [, , , ];'}{'b': 5', '25', '44', '63', '69', '64', '6', '26', '45', '7', '27', '46', '8', '28', '47', '7', '27', '46', '13', '33', '53, '(c) passing the outlet product material stream [, , , ] of step (b) either directly to a main fractionator [] to obtain heavy bottom fraction [] or an intermediate separator [, , ] to split outlet product material stream into top fraction [, , ] and bottom product [, , ] and transferring the top fraction [, , ] to a main fractionator [, , ];'}{'b': 64', '8', '28', '47', '9', '29', '49', '65', '10', '30', '50', '66, '(d) heating the heavy bottom fraction [] or the heavy bottom [, , ] of step (c) in a coker furnace [, , , ] to obtain hot hydrocarbon stream [, , , ];'}{'b': 10', '30', '50', '66', '11', '31', '51', '67', '12', '32', '52', '68, '(e) transferring the hot hydrocarbon stream [, , , ] of step (d) to preheated coke drums [, , , ] where it undergoes severe thermal cracking reactions to obtain product vapors [, , , ]; and'}{'b': 12', '32', '52', '68', '13', '33', '53', '69, '(f) passing ...
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