Nalco Chemical Company

Darrell L Werges

Manian Ramesh

Jeffrey R Cramm

Christopher P Howland

Donald R Anderson

Karl H Hoffmann

An improved process for the preparing a dispersions of water soluble cationic polymers in an aqueous salt solution is disclosed. The improvement comprises using as a polymeric dispersion stabilizer a water soluble hydrophobically associating copolymer of diallyldimethylammonium chloride and a monomer selected from the group consisting of: ##STR1## and alkyl esters of acrylic acid, where R.sub.1 is either hydrogen or CH.sub.3 ; R.sub.2 and R.sub.3 are each an alkyl group having 1 to 3 carbon atoms; A.sub.1 is either an oxygen atom or NH; B.sub.1 is either an alkylene group having 2 to 4 carbon atoms or a hydroxypropylene group, Q is benzyl, or C.sub.6 -C.sub.20 alkyl, and X.sub.1.sup.- is an anionic counterion.

Hydrophobically associating dispersants used in forming polymer

Apparatus and method for first mixing continuously at a prechosen flow rate a less dense fluid with a more dense fluid, the fluids being at least partially immiscible, so as to achieve a constant weight ratio of one fluid to the other per prechosen unit of mixed fluid volume transversely across the path of such mixed fluid followed by charging the resulting mixed fluid simultaneously to a multiplicity of tubes in a tubular reactor under conditions of substantially plug flow. At least one of the fluid is a liquid at all times.

Mixing two immiscible fluids of differing density

An improved technique for making a Raney copper catalyst by contacting particulate copper/aluminum alloy particles with an aqueous solution containing dissolved therein both alkali metal hydroxide and at least one saccharide or glycoside.

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Park Forest, IL, United States of America

Darrell L Werges