C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 317/18 (2006.01) B01D 17/04 (2006.01) B01F 17/00 (2006.01) C02F 1/54 (2006.01) C07D 319/06 (2006.01) C10M 173/00 (2006.01) C11D 1/72 (2006.01) C11D 1/722 (2006.01) C11D 1/825 (2006.01) C11D 11/00 (2006.01) C23G 5/00 (2006.01) D21C 5/02 (2006.01) D21C 9/10 (2006.01)
Patent
CA 2176277
A nonionic surfactant having cyclic 1,3-dioxane and/or 1,3-dioxolane functionality is irreversibly splittable by lowering the pH of its aqueous solution. The cyclic 1,3-dioxolane has the formula: (see figure I) The 1,3-dioxolane has the formula: (see figure II) of which R is hydrogen and R' has no alkoxy linkage and is the residue of an organic compound (substituted or unsubstituted) derived from an aldehyde of the formula (see figure III) wherein R is hydrogen and R' is the residue of an organic compound (substituted or unsubstituted) which contains a total of 8 to 20 carbon atoms and which contains no moieties or linkages which significantly interfere with the performance of the surfactant for its intended purpose; X is hydrogen or the residue of a hydrophobic end-cap; Y is hydrogen, methyl, ethyl, or mixtures thereof; Z is hydrogen, methyl, or ethyl; m is 0 or 1; and n is an integer of 1 to 40. After splitting of the surfactant into its components aldehyde and polyol, the hydrophobic components phase-separate and can be removed from the aqueous stream by routine means. The nonionic surfactant is useful in various processes requiring the removal of emulsified hydrophobic contaminants or other hydrophobic materials from an aqueous stream.
Galante Denise Christine
Hoy Richard Charles
Joseph Albert Ferris
King Stephen Wayne
Smith Charles Arnold
Sim & Mcburney
Union Carbide Chemicals & Plastics Technology Corporation
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