The suspensoid cracking process, which has been used in commercial operations since 1940, employs relatively small amounts of catalysts in coil-type tubular reactors similar to those used in conventional pyrolytic cracking. The catalysts which are used give improved product quality and, by adsorbing materials which tenld to form coke, enable operations to be conducted at much higher temperatures and pressures than would be possible without them.
The effects of temperature, pressure, reaction time and feed stock boiling-range on the product quality and distribution are generally similar to those observed in pyrolytic cracking. In addition, the catalyst has been shown to be effective in promoting reactions of carbon bond rupture, polymerization, alkylation and hydrogen transfer and in the production of branched-chain paraffins anld aromatics.
The techniques developed for suspensoid cracking should be well suited to other chemical processes which require the use of small quantities of active catalysts in continuous operations.
Le procédé de cracking, suspensoïde", en exploitation depuis 1940, utilise des quantités de catalyseur relativement faibles dans des réacteurs tabulaires du type serpentin semblables à ceux utilisés dans le cracking thermique normal.
Les catalyseurs employés donnent des produits de meilleure qualité et grace à l'adsorption des corps ayant tendance à former du coke, permettent de travailler à des températures et pressions plus devées.
La température, la pression, le temps de réaction et les limites de distillation de la charge ont des effets généralement voisins de ceux obtenus avec le cracking thermique. De plus le catalyseur facilite les réactions de rupture des liaisons de carbone, de poly- * Research Director Imperial Oil, Ltd., Sarnia, Canada. ** Chief Research Chemist Imperial Oil, Ltd., Sarnia, Canada. mérisation, d'alkylation, de déplacement d'hydrogène et la production d'hydrocarbures paraf finiques et aromatiques à chaînes latérales.
Les techniques utilisées pour le cracking suspensoïde pourraient être adaptées à d'autres procédés chimiques nécessitant l'emploi de faibles quantités de catalyseur actif 'dans des opérations continues.
The suspensoid cracking process, which was developed (by Imperial Oil Limited, is one which employs relatively small amounts of catalysts for thï cracking of petroleum hydrocarbons in coil-type tubular reactors similar to those used in conventional pyrolytic cracking. The catalysts used enable continuous Operations to be carried out at much higher temperatures and pressures than would be possible without them, and also effect considerable improvement in product quality.
The operating technique was worked out using full-scale equipment in experiments begun in 1934.
In I940 the process was adopted commerci
