05-12-2019 дата публикации
Номер: US20190367822A1
Принадлежит:
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. 1. A hydrocarbon conversion process , comprising: (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.;, '(a) providing a first pyrolysis tar, wherein,'}{'sub': 'T', '(b) isolating a sample from the first pyrolysis tar and measuring a reactivity Rof the sample;'}{'sub': T', 'Ref, 'claim-text': [{'sub': T', 'Ref, '(i) when Ris less than or equal to a predetermined reference reactivity R, carrying out the hydroprocessing of step (d); or'}, {'sub': T', 'Ref, 'claim-text': [{'sub': HS', 'HS', 'HS', 'HS', 'HS, '(A) heating the first pyrolysis tar to achieve a temperature Tand maintaining the first pyrolysis tar at a temperature in a range of from Tto 360° C. for a time of time tto produce a pyrolysis tar composition, wherein Tis in the range of from 150° C. to 350° C. and tis ≥1 minute,'}, {'sub': 'T', '(B) isolating a sample from the pyrolysis tar composition and measuring the reactivity Rof the pyrolysis tar composition sample, and'}, '(C) repeating step (c); and, '(ii) when Ris greater than a predetermined reference reactivity R,'}], '(c) comparing Rto a predetermined reference reactivity R, wherein,'}(d) hydroprocessing at least a portion of the pyrolysis tar composition to produce a hydroprocessor effluent comprising hydroprocessed pyrolysis tar.2. (canceled)3. The process of claim 1 , wherein (i) Rand Rare determined by a Bromine Number measurement and expressed in BN units claim 1 , (ii) Ris ≤20 BN claim 1 , and ( ...
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