25-05-2017 дата публикации
Номер: US20170145322A1
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 for mild thermal cracking of the feedstock and an intermediate separator, before being subjected to higher severity thermal cracking in delayed coking process, resulting in reduction in overall coke yield. 1. A method of reducing overall coke yield said method comprising the steps of:{'b': 1', '19', '37', '54', '74', '2', '20', '38', '55', '76', '3', '21', '39', '56', '77, '(a) heating a hydrocarbon feedstock [, , , , ] in a furnace [, , , , ] to obtain hot feed [, , , , ];'}{'b': 3', '21', '39', '56', '77', '4', '22', '40', '57', '78', '5', '23', '41', '58', '79, '(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', '23', '41', '58', '79', '24', '30', '6', '42', '59', '80', '7', '43', '62', '81', '8', '44', '63', '82', '7', '43', '62', '81', '12', '36', '61', '73, '(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': 30', '8', '44', '63', '82', '2', '20', '38', '55', '76', '9', '31', '45', '64', '83, '(d) heating the heavy bottom fraction [] or the heavy bottom [, , , ] of step (c) in a furnace [, , , , ] to obtain hot hydrocarbon stream [, , , , ];'}{'b': 9', '31', '45', '64', '83', '10', '32', '46', '65', '84', '11', '33', '47', '66', '85, '(e) transferring the hot hydrocarbon stream [, , , , ] of step (d) to preheated coke drums [, , , , ] where it undergoes severe thermal cracking reactions to obtain product vapors [, , , ...
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