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US 11,168,268 B2Granted
Pyrolysis tar conversion
AssigneeExxonMobil Chemical Patents Inc.
InventorsKapil Kandel, Glenn A. Heeter, Teng Xu, Giovanni S. Contello, Krystle J. Emanuele
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Abstract
This invention relates to a process for determining the suitability of pyrolysis tar, such as steam cracker tar, for upgrading using hydroprocessing without excessive fouling of the hydroprocessing reactor. A pyrolysis tar is sampled, the sample is analyzed to determine one or more characteristics of the tar related to tar reactivity, and the analysis is used to determine conditions under which the tar can be blended, pre-treated, and/or hydroprocessed.
Claims13
A hydrocarbon conversion process, comprising:
- (a) providing a first pyrolysis tar, wherein,
- (i) the first pyrolysis tar contains free radicals and
- (ii) at least 70 wt. % of the first pyrolysis tar has a normal boiling point of at least 290° C.;
- (b) isolating a sample from the first pyrolysis tar and measuring a reactivity RT of the sample;
- (c) comparing RT to a predetermined reference reactivity RRef;
- (d) when RT is greater than a predetermined reference reactivity RRef,
- (A) Heating at least a portion of the first pyrolysis tar to achieve a temperature THS and maintaining the at least a portion of the first pyrolysis tar at a temperature in a range of from THS to 360° C. for a time of time tHS to produce a pyrolysis tar composition, wherein THS is in the range of from 150° C. to 350° C. and tHS is ≥1 minute,
- (B) isolating a sample from the pyrolysis tar composition and measuring the reactivity RT of the pyrolysis tar composition sample, and
- (C) repeating step (c);
- and
- (e) when RT is less than or equal to a predetermined reference reactivity RRef, hydroprocessing at least a portion of the pyrolysis tar composition to produce a hydroprocessor effluent comprising hydroprocessed pyrolysis tar.
8 more elements
Dependencies are inferred from the claim text.