Patent ID: 11939543
Assignee: EXXONMOBIL CHEMICAL PATENTS INC.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 13:
14. A steam cracking process, comprising:
(a) steam cracking a hydrocarbon feed to produce a steam cracker effluent;
(b) adding a quench oil composition to the steam cracker effluent to produce a quenched mixture, wherein the quench oil composition comprises a concentration of donatable hydrogen of 0.5 wt. % or more based on a total weight percent of the quench oil composition;
(c) separating steam cracker tar from the quenched mixture;
(d) hydroproces sing at least a portion of the separated steam cracker tar in a first hydroprocessing zone under catalytic hydroprocessing conditions to produce a first hydroprocessor product comprising hydroprocessed steam cracker tar;
(e) separating at least a portion of the hydroprocessed steam cracker tar from the first hydroprocessor product; and
(f) separating from the first hydroprocessor product
(i) an overhead stream comprising ≥about 1.0 wt. % of the first hydroprocessed product;
(ii) a primarily liquid-phase mid-cut stream comprising ≥about 20 wt. % of the first hydroprocessed product; and
(iii) a bottoms stream comprising ≥about 20 wt. % of the first hydroprocessed product;

(g) dividing the mid-cut stream into at least first and second portions;
(h) transferring the first portion to step (d), wherein the catalytic hydroprocessing conditions include combining at least a portion of the separated steam cracker tar with at least a portion of the transferred first portion; and transferring the second portion to step (b), wherein the quench oil composition comprises at least a portion of the transferred second portion.