The Dow Chemical Company

Engelhard Corporation

Clark W Gibson

Carl P Strange

David M Stockwell

Mitchell J Willis

George E Gantt

George K Greminger, Jr

Christopher D Messelt

Robert E Barnes

Patricia A Warner

An in situ process for making improved zeolitic fluid cracking catalysts by spray drying a mixture of (i) hydrous kaolin and/or metakaolin, and (ii) calcined aluminum source, said calcined aluminum source being derived from a pulverized, ultrafine kaolin, calcining the resulting microspheres to convert hydrous kaolin to metakaolin, and reacting microspheres composed of a mixture of metakaolin and calcined aluminum source with an alkaline sodium silicate solution. The weight percent of metakaolin in the calcined microspheres is greater than the calcined aluminum source content.

Fluid catalytic cracking catalyst manufacturing process

Higher reaction efficiencies are seen in cellulose etherification reactions when the reagents are continuously added to alkali cellulose at elevated temperatures. In particular, mixed hydroxyalkylcellulose ethers are prepared with higher reaction efficiencies using this process. In an especially preferred embodiment, hydroxypropylmethylcellulose is prepared by continuously adding propylene oxide to heated cellulose containing a small amount of caustic, adding more caustic and then continuously adding methyl chloride at elevated temperatures.

Process for preparing hydroxyalkylcellulose ethers

Novel ternary hydroxyethylhydroxypropylmethylcellulose ethers are disclosed. These ethers have lower cloud points than most cellulose ethers having hydroxyethoxyl substitution and exhibit return cloud points which are approximately the same as their cloud points.

Water-soluble, ternary cellulose ethers

Cellulose derivatives having a controlled molecular weight are prepared by adjusting oxygen concentration as measured by analyzing the quantity of oxygen in the head space of the reaction vessel to a level such that the cellulose derivative prepared therein has a desired solution viscosity. The cellulose derivative is then prepared in the reaction vessel without substantially increasing the quantity of oxygen in said reaction vessel.

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Bainbridge, GA, United States of America

Clark W Gibson