21-06-2018 дата публикации
Номер: US20180171239A1
Принадлежит:
A process is provided for determining the suitability of pyrolysis tar, such as steam cracker tar, for upgrading using hydroprocessing without long term fouling of the hydroprocessing reactor. The process includes heating a sample of the tar, quenching the sample, and measuring the total free radical content of the quenched sample. A pyrolysis tar can be blended with one having a lesser total free radical content to produce a blend that can be hydroprocessed with decreased fouling. 1. A hydrocarbon process , comprising:{'sub': '1', '(a) providing a first pyrolysis tar having a temperature T≤350° C., the pyrolysis tar being a hydrocarbon-containing mixture which includes free radicals and is derived from hydrocarbon pyrolysis, wherein at least 70 wt. % of the mixture has a normal boiling point of at least 290° C.;'}{'sub': 2', 'h', '2', '1, '(b) isolating a sample from the first pyrolysis tar and producing additional free radicals in the sample by exposing the sample to a predetermined second temperature Tfor a predetermined time t, wherein T≥T+10° C.;'}{'sub': 3', '3', '1', 'T, '(c) cooling the sample to a temperature T, Tbeing ≤T, the cooled sample having a total free radical content R;'}{'sub': 'T', 'claim-text': {'sub': T', 'ref, 'claim-text': [{'sub': '1', '(A) providing a second pyrolysis tar at a temperature ≤T, the second pyrolysis tar being a hydrocarbon-containing mixture derived from hydrocarbon pyrolysis, wherein at least 70 wt. % of the mixture has a normal boiling point of at least 290° C., and combining the first pyrolysis tar with a predetermined amount of the second pyrolysis tar to produce a pyrolysis tar composition,'}, {'sub': 2', 'h', '3', 'T, '(B) (I) isolating a sample from the pyrolysis tar composition, (II) producing additional free radicals in the pyrolysis tar composition sample by exposing the pyrolysis tar composition sample to a temperature of at least Tfor time of at least t, and (III) cooling the pyrolysis tar composition sample to a ...
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