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US 10,894,925 B2Granted
Multistage upgrading hydrocarbon pyrolysis tar
AssigneeExxonMobil Chemical Patents Inc.
InventorsKapil Kandel, Bryan A. Patel, Sumathy Raman, John S. Coleman, Reyyan Koc-Karabocek, Teng Xu, Cyrus J. Rachal, Subramanya V. Nayak
Life of this patent
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Abstract
A multi-stage process for upgrading tars is provided. A predominantly hydrotreating stage can be applied before a cracking stage, which can be a hydrocracking or a thermal cracking stage. Alternatively, a predominantly cracking stage, which can be a hydrocracking or a thermal cracking stage, can be applied before a hydrotreating stage. Apparatus suitable for performing the method is also provided.
Claims25
A hydrocarbon conversion process, comprising:
- (a) providing a feedstock comprising:
- ≥10.0 wt. % of pyrolysis tar hydrocarbon based on the weight of the feedstock, the pyrolysis tar hydrocarbon having a IN≥100 and viscosity measured at 50° C. of ≥10,000 cSt, and
- a utility fluid comprising aromatic hydrocarbons and having an ASTM D86 10% distillation point >60° C. and a 90% distillation point <425° C.;
- (b) hydroprocessing the feedstock in a first hydroprocessing zone in the presence of a first treat gas comprising molecular hydrogen under first catalytic hydroprocessing conditions to produce a first hydroprocessed product having a vapor phase and a liquid phase;
- (c) separating a vapor phase product and a liquid phase product from the first hydroprocessed product, wherein the vapor phase product comprises hydrogen sulfide and molecular hydrogen;
- (d) hydroprocessing the liquid phase product in a second hydroprocessing zone in the presence of a second treat gas comprising molecular hydrogen under second catalytic hydroprocessing conditions to produce a second hydroprocessed product, wherein:
- the first catalytic hydroprocessing conditions are such that in the first hydroprocessing zone a catalyst is used that promotes a hydrotreating reaction over a hydrocracking reaction at the same reaction conditions, and
- the second catalytic hydroprocessing conditions are such that in the second hydroprocessing zone a catalyst is used that promotes a hydrocracking reaction over a hydrotreating reaction at the same reaction conditions;
- and
- (e) contacting the vapor phase product with an amine solution to remove at least a portion of the hydrogen sulfide to produce a spent amine stream and a gas effluent comprising the molecular hydrogen.
7 more elements
A hydrocarbon conversion process, comprising:
- (a) providing a feedstock comprising:
- ≥10.0 wt. % of pyrolysis tar hydrocarbon based on the weight of the feedstock, the pyrolysis tar hydrocarbon having a IN<105 and viscosity measured at 50° C. of <15,000 cSt, and
- a utility fluid comprising aromatic hydrocarbons and having an ASTM D86 10% distillation point >60° C. and a 90% distillation point <425° C.;
- (b) hydroprocessing the feedstock in a first hydroprocessing zone in the presence of a first treat gas comprising molecular hydrogen under first catalytic hydroprocessing conditions to produce a first hydroprocessed product having a vapor phase and a liquid phase;
- and
- (c) hydroprocessing at least a portion of the first hydroprocessed product in a second hydroprocessing zone in the presence of a second treat gas comprising molecular hydrogen under second catalytic hydroprocessing conditions to produce a second hydroprocessed product, wherein:
- the first catalytic hydroprocessing conditions are such that in the first hydroprocessing zone a catalyst is used that promotes a hydrocracking reaction over a hydrotreating reaction at the same reaction conditions, and
- the second catalytic hydroprocessing conditions are such that in the second hydroprocessing zone a catalyst is used that promotes a hydrotreating reaction over a hydrocracking reaction at the same reaction conditions.
5 more elements
A hydrocarbon conversion process, comprising:
- (a) providing a feedstock comprising:
- ≥10.0 wt. % pyrolysis tar hydrocarbon based on the weight of the feedstock, the pyrolysis tar hydrocarbon having a IN<105 and viscosity measured at 50° C. of <15,000 cSt, and
- a utility fluid comprising aromatic hydrocarbons and having an ASTM D86 10% distillation point >60° C. and a 90% distillation point <425° C.;
- and
- (b) processing the feedstock in at least two processing zones to produce a processed tar, wherein
- (i) the processing of the first processing zone includes converting at least a portion of the pyrolysis tar hydrocarbon,
- (ii) the processing of the second processing zone includes converting at least a portion of the pyrolysis tar hydrocarbon in the presence of molecular hydrogen and at least one hydroprocessing catalyst,
- (iii) the conversion of the first processing zone is carried out under hydroprocessing conditions that promote cracking over hydrotreating under the same reaction conditions, and the conversion of the second processing zone is carried out under hydroprocessing conditions that promote catalytic hydrotreating over cracking under the same reaction conditions, and
- (iv) the processing in the first processing zone is carried out before the processing in the second processing zone;
- (c) separating a vapor phase product and a liquid phase product from an effluent recovered from the first processing zone, wherein the liquid phase product is processed in the second processing zone to produce the processed tar, and wherein the vapor phase product comprises hydrogen sulfide and molecular hydrogen;
- and
- (d) contacting the vapor phase product with an amine solution to remove at least a portion of the hydrogen sulfide to produce a spent amine stream and a gas effluent comprising the molecular hydrogen.
9 more elements
Dependencies are inferred from the claim text.