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:
May. 18, 2010
Filed:
Jul. 08, 2005
Robert David Strack, Houston, TX (US);
Richard C. Stell, Houston, TX (US);
John R. Messinger, Kingwood, TX (US);
Dane C. Grenoble, Houston, TX (US);
John E. Asplin, Singapore, SG;
Robert David Strack, Houston, TX (US);
Richard C. Stell, Houston, TX (US);
John R. Messinger, Kingwood, TX (US);
Dane C. Grenoble, Houston, TX (US);
John E. Asplin, Singapore, SG;
Exxonmobil Chemical Patents Inc., Houston, TX (US);
Abstract
A method is disclosed for treating gaseous effluent from a hydrocarbon pyrolysis unit to provide steam cracked tar of reduced asphaltene and toluene insolubles content. The method is suitable for preparing reduced viscosity tar useful as a fuel blending stock, or feedstock for producing carbon black, while reducing or eliminating the need for externally sourced lighter aromatics additives to meet viscosity specifications. The method comprises drawing steam cracked tar from a separation vessel, e.g., a primary fractionator or tar knock-out drum, cooling the tar, and returning it to the separation vessel to effect lower overall tar temperatures within the separation vessel, in order to reduce viscosity increasing condensation reactions. An apparatus for carrying out the method is also provided.