DELAYED COKING PROCESS USING STEAMED ADDITIVE

摘要

This invention relates to a coking process whereby an additive is introduced into a coking vessel above the vapor/liquid-solid interface. In particular, the invention relates to a coking process, whereby a specific steamed fresh additive is introduced into a coking vessel above the vapor/liquid-solid interface to increase the yield of highly desirable coking process products and/or reduce the yield of undesirable products. The steamed fresh additive is prepared by a process comprising the steps of: (i) preparing a composition comprising at least two of (a) a zeolite, (b) a clay and (c) a matrix, wherein said matrix is alumina, silica or mixtures thereof; (ii) shaping the composition to form particles; and (ii) heating said particles in the presence of steam to form the steamed fresh additive.