Exxonmobil Chemical Patents Inc.

Subramanya V Nayak

Teng Xu

Kapil Kandel

John Slocum Coleman

Gaurav Agrawal

Bryan A Patel

Stephen Todd Cohn

Sumathy Raman

Reyyan Koc-Karabocek

Cyrus J Rachal

A multi-stage process is described for upgrading pyrolysis tar, such as steam cracker tar, by hydroprocessing in at least two stages. Hydroprocessing in a first stage is performed in the presence of a utility fluid. The utility fluid has a boiling point distribution from about 120&#xb0; C. to about 480&#xb0; C. and is separated from the first stage product.

Multi-stage upgrading of hydrocarbon pyrolysis tar using recycled interstage product

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.

Multistage upgrading hydrocarbon pyrolysis tar

A hydrocarbon conversion process comprises providing a hydrocarbon feedstock comprising an effluent fraction from a pyrolysis process, wherein the effluent fraction has an initial boiling point at atmospheric pressure of at least 177&#xb0; C. and a final boiling point at atmospheric pressure of no more than 343&#xb0; C. and comprises at least 0.5 wt. % of olefinic hydrogen atoms based on the total weight of hydrogen atoms in the effluent fraction. The hydrocarbon feedstock is hydroprocessed in at least one hydroprocessing zone in the presence of treatment gas comprising molecular hydrogen under catalytic hydroprocessing conditions to produce a hydroprocessed product comprising less than 0.5 wt. % of olefinic hydrogen atoms based on the total weight of hydrogen atoms in the hydroprocessed product. The hydroprocessing conditions comprise a temperature from 150 to 350&#xb0; C. and a pressure from 500 to 1500 psig (3550 to 10445 kPa-a).

Upgrading hydrocarbon pyrolysis products

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Buffalo Grove, IL, United States of America

Subramanya V Nayak