Abstract: A hydrocarbon cracking process using a catalyst composition which contains a silica-magnesia or silica-magnesia-fluoride composite in combination with a substantial amount of clay. The catalyst yields desirable selectivity in combination with superior regeneration characteristics. In a preferred embodiment, the catalyst composition also contains a crystalline aluminosilicate zeolite.

Abstract: An osmotic dispenser comprised of (1) a water permeable membrane forming part or all of the walls of an enclosure surrounding (2) an active agent, and in some cases (3) an additional compound known as an osmotic attractant which together exhibits an osmotic pressure against water. When placed in an aqueous environment water is osmotically drawn into the enclosure by the combined action of the agents (2) and (3) which distends and swells the enclosure until the membrane or some other part of the enclosure wall reaches the point of ultimate elongation and a portion of the wall yields and ruptures releasing the contents of the enclosure to the environment.