The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 28, 2025
Filed:
Jan. 04, 2022
Exxonmobil Chemical Patents Inc., Baytown, TX (US);
Yifei Liu, Houston, TX (US);
Stephen T. Cohn, Spring, TX (US);
Jeffrey C. Yeh, Houston, TX (US);
Teng Xu, Houston, TX (US);
ExxonMobil Chemical Patents Inc., Spring, TX (US);
Abstract
Processes are described for producing mesophase pitch. The processes generally comprise providing a feedstock having a T5≥400° F. (204° C.) and a T95≤1,400° F. (760° C.) and heating the feedstock at a temperature ranging from about 420° C. to about 520° C. to produce a heat treated product including isotropic pitch. Generally, the heating is conducted under conditions sufficient to satisfy the relationship [X*Y]≥20,000 seconds, wherein X is the equivalent reaction time of the heating, and wherein Y is the bromine number of the feedstock as measured in accordance with ASTM D1159. The processes generally further comprise contacting the isotropic pitch with a solvent having a Solubility Blending number (S) of at least about 10 SU under conditions sufficient to produce a solvent fraction comprising the solvent and an insoluble fraction comprising mesophase pitch, and recovering the mesophase pitch.