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:
Apr. 14, 2015
Filed:
Mar. 01, 2012
Kuang-yeu Wu, Plano, TX (US);
Tzong-bin Lin, Chia-Yi, TW;
Fu-ming Lee, Katy, TX (US);
Tsung-min Chiu, Taipei, TW;
Jeng-cheng Lee, Chia-Yi, TW;
Kuang-Yeu Wu, Plano, TX (US);
Tzong-Bin Lin, Chia-Yi, TW;
Fu-Ming Lee, Katy, TX (US);
Tsung-Min Chiu, Taipei, TW;
Jeng-Cheng Lee, Chia-Yi, TW;
CPC Corporation, Taiwan, Taipei, TW;
AMT International, Inc., Plano, TX (US);
Abstract
Recovering high purity benzene from hydrocarbon feedstock containing aromatics and non-aromatics is implemented by simple and low-cost modifications to conventional extractive distillation columns (EDCs). Methyl cyclohexane (MCH) that is generated through non-selective hydrogenation of toluene in hydrodesulfurization (HDS) units is a major contaminant in benzene production. To meet MCH specifications, often times the extractive distillation (ED) process for recovering purified benzene is operated with excessive benzene loss to the overhead raffinate stream, producing a lower quality non-aromatic product. Novel techniques (1) remove operational constrictions of the HDS unit on MCH production, thus lengthening the catalyst life and (2) allow the EDC to drive essentially any amount of MCH away from the bottom benzene product without concerns with benzene loss to the overhead raffinate stream and (3) recover benzene from the overhead raffinate stream to upgrade the quality of non-aromatic product and increase the benzene product recovery.