Nalco Company

Ondeo Nalco Company

Nalco Chemical Company

Larry E Brammer, Jr

Murat Quadir

Robert P Mahoney

Manian Ramesh

John David Kildea

John T Malito

Everett C Phillips

Peter E Reed

Phillip W Carter

Patrick G Murray

Cheng-Sung Huang

Andrew J Dunham

Leonard M Ver Vers

Barbara E Fair

Mingli Wei

Wayne M Carlson

John David Morris

Yin Z Hessefort

Kailas B Sawant

Charles J Holada

Linh Quach

Murat A Quadir

The invention provides a method of continuously producing high quality quaternized N,N-dialkylaminoethyl (meth)acrylates (DMAEA.MCQ) that has a long shelf life and which is stable in water. The method involves placing starting materials into a continuously stirred tank reactor in the presence of less than 6% water. This low amount of water causes two liquid phases to form and prevents unwanted side reactions. The denser liquid phase contains DMAEA.MCQ and the lighter phase contains the starting materials. Liquid from the denser phase is removed from a position where little of the lighter phase has been mixed in. The removed liquid then has any last traces of the starting materials reacted into DMAEA.MCQ and strips away any starting materials with a gas flow. The resulting liquid is high purity DMAEA.MCQ. Water can then safely be added to ease in the transport and use of the produced DMAEA.MCQ.

Continuous production of DMAEA quaternary salts

A high molecular weight, water-soluble polymer comprising pendant salicylic acid groups and having a weight average molecular weight of at least about 2,000,000 daltons and use of the polymer for clarifying red mud-containing liquors generated in the Bayer process for the recovery of alumina from bauxite.

High molecular weight polymers containing pendant salicylic acid groups for clarifying bayer process liquors

A method and apparatus for preparing a N,N-dialkylaminoalkyl acrylate in a continuous transesterification reaction. The reaction involves adding alkyl acrylates such as methacrylate or ethacrylate to a reboiler mechanism and efficiently removing alcohol co-products. Because the reaction is continuous, the alkyl acrylates can be added as needed to increase output, decrease output, or fine-tune the reaction dynamics. An entrainer is used to form a volatile azeotrope which contains both alcohol and entrainer and which is easily removed from the reboiler mechanism. This method reduces the amount of entrainer needed per unit of alkyl acrylate used and eliminates any need to purify the end product from entrainer contamination of the resulting N,N-dialkylaminoalkyl acrylate product.

Production of N,N-dialklylaminoethyl (meth)acrylates

High molecular weight polymers containing pendant salicylic acid groups for clarifying Bayer process liquors

A UV-protective composition for treating substrates comprising one or more water-soluble, cationic, UV-absorbing polymers, wherein the cationic, UV-absorbing polymers are prepared by polymerizing one or more vinyl, allyl or acrylic monomers with one or more vinyl or acrylic monomers that absorb ultraviolet light radiation having a wavelength of about 200 to about 420 nm and a method of treating substrates.

Water soluble monomers and polymers for protecting substrates from ultraviolet light

This invention is directed to high molecular weight water-soluble zwitterionic polymers derived from zwitterionic and nonionic monomer units, and to the use of the polymers in papermaking processes.

High molecular weight zwitterionic polymers

A method of flocculating suspended solids in a Bayer process liquor comprising adding to the liquor an effective amount of a polymer comprising salicylic acid groups.

Method of clarifying bayer process liquors using salicylic acid containing polymers

Growing community of inventors

Aurora, IL, United States of America

Larry E Brammer, Jr