Environmentally-friendly oil/water demulsifiers

C - Chemistry – Metallurgy – 10 – G

Patent

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Details

C10G 33/04 (2006.01) C07C 43/32 (2006.01) C08G 65/331 (2006.01)

Patent

CA 2648590

The invention relates to particular orthoester based polymers as well as the use of specific orthoester based polymers as a demulsifier for water/oil emulsions. Products suitable for use according to the invention have the formula (I), wherein R1 is hydrogen or a hydrocarbyl group with 1 -4 carbon atoms, R2, R3, and R4 are, independently, a group comprising C3-C4 alkyleneoxy groups and/or ethyleneoxy groups in any order, and an end group Y, which is, independently, hydrogen, a hydrocarbyl group with 1-30 carbon atoms, a group -(CH2)zNR5R6 or -(CH2)ZN+R5R6R7, wherein each of R5, R6, and R7 is, independently, an alkyl group with 1-22 carbon atoms or -CH2CH2OH, and z is 2 or 3, provided that at least one of the groups R2, R3, and R4 comprises at least one block of at least on average 4 alkyleneoxy groups with 3 and/or 4 carbon atoms, and provided that if Y is hydrogen, then at least one of n and m is a number of 1-100, or a di- or polycondensate of the polymer via free hydroxyl groups in R2, R3 or R4.

L'invention concerne des polymères à base d'orthoesters particuliers ainsi que l'utilisation de polymères à base d'orthoesters spécifiques en tant que désémulsifiant pour des émulsions eau/huile. Les produits convenant à une utilisation selon l'invention répondent à la formule (I), dans laquelle R1 est un hydrogène ou un groupe hydrocarboné ayant 1-4 atomes de carbone, R2, R3 et R4 sont chacun, indépendamment, un groupe comprenant des groupes oxyde d'alkylène en C3-C4 et/ou des groupes oxyde d'éthylène dans n'importe quel ordre et un groupe terminal Y lequel est, indépendamment, un hydrogène, un groupe hydrocarboné ayant 1-30 atomes de carbone, un groupe -(CH2)zNR5R6 ou -(CH2)ZN+R5R6R7, où chacun de R5, R6 et R7 est, indépendamment, un groupe alkyle ayant 1-22 atomes de carbone ou -CH2CH2OH et z vaut 2 ou 3, à condition qu'au moins l'un des groupes R2, R3 et R4 comprenne au moins un bloc d'au moins en moyenne 4 groupes oxyde d'alkylène ayant 3 et/ou 4 atomes de carbone et à condition que si Y est un hydrogène, alors au moins l'un de n et m soit un nombre valant 1-100 ; ou un produit de dicondensation ou de polycondensation du polymère via les groupes hydroxyles libres présents dans R2, R3 ou R4.

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