Dow Global Technolgoies LLC

Rohm and Haas Company

Jacob Crosthwaite

John G Pendergast, Jr

William G Worley

Stacy W Hoy, Iv

Felipe A Donate

Xin Jiang

Cheng Shen

Jing Ji

Robert M Campbell

Troy E Knight

Rebecca J Wachowicz

Pramod D Patil

Adam L Grzesiak

Amit Katiyar

Jacinto Lopez-Toledo

Kazuyuki Hasegawa

A prepolymer comprising acid functionality is made by a process comprising the step of contacting: (i) a di-isocyanate, (ii) a polyol containing an acid group, (iii) a polyol without an acid group, and (iv) a metal salt catalyst, the contacting conducted under reaction conditions and in a solvent consisting essentially of: (A) a dialkyl amide, and (B) optionally, an aprotic glycol ether. The prepolymer is useful in the preparation of water-based polyurethane dispersions, and certain of the solvent blends consisting essentially of a dialkyl amide and an optional aprotic glycol ether are azeotropic or pseudo-azeotropic.

Water-based polyurethane dispersions and their preparation

The present invention provides for a method of using a mixture of two or more nonionic surfactants for enhanced oil recovery and for an emulsion that includes carbon dioxide, a diluent and a mixture of two or more nonionic surfactants, where each nonionic surfactant is prepared with a double metal cyanide catalyst.

Nonionic surfactant compositions for enhanced oil recovery

A methanol/MMA azeotrope is broken or avoided by a method comprising the steps of (1) raising the pressure within a first vessel, e.g., a distillation column, that contains a methanol/MMA azeotrope, (2) collecting the azeotrope as a liquid, and then in a second, separate vessel, e.g., another distillation column, (3) raising the pressure sufficiently to allow for the breaking of or avoidance of the azeotrope and the recovery of the methanol.

Breaking a methanol/methyl methacrylate azeotrope using pressure swing distillation

The azeotrope, or near azeotrope, of methanol and MMA is separated via extractive distillation using an extractive distillation solvent comprising cyclohexanone.

Separation process

Growing community of inventors

Midland, MI, United States of America

Jacob Crosthwaite