STUDIES REVEAL SHOT-COKE MICROSTRUCTURE, SUGGEST WAYS TO MINIMIZE ITS FORMATION.

The microstructure of shot coke has been revealed by experimental studies of the formation of various petroleum cokes by carbonization of heavy resids. The results of these experimental studies indicate the mechanisms responsible for the formation of shot coke, and they suggest procedures to minimize the formation of shot coke in commercial delayed cokers. The structure of shot coke is described by the use of montage microphotographs, comparing the structure to that of sponge coke. Photographs reveal the fine-mosaic, high-density structure of shot coke.