Stratification resistant emulsions

B - Operations – Transporting – 01 – F

Patent

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Details

B01F 17/52 (2006.01) C10L 1/18 (2006.01) C10L 1/195 (2006.01) C10L 1/32 (2006.01)

Patent

CA 2299331

Emulsions containing a hydrocarbon liquid in a continuous phase and alcohol and/or water in a dispersed phase. The emulsions are stabilised by an emulsifier and a coupling agent. The emulsifier is a copolymer containing at least one relatively hydrophobic polymeric block of styrene or ring substituted styrene monomer, and at least one relatively hydrophilic polymeric block of at least one monomer, such as ethylene oxide, selected from the group having the formula H(O-R)n OH where R is an aliphatic radical containing from 1 to 4 carbon atoms and n is a number between 20 and 300. The coupling agent is a copolymer containing at least one polymeric block of styrene or ring substituted styrene monomer, and at least one block being of a saturated or unsaturated aliphatic hydrocarbon moiety, such as butadiene. The emulsifier is present in an amount sufficient to form micelles of the relatively hydrophilic polymer block sufficient to contain the dispersed phase and the coupling agent is present in an amount that is sufficient to substantially prevent the dispersed phase droplets from coalescing while not being present in a sufficiently high amount that micelles of the styrene containing polymeric blocks of the coupling agent form in the continuous phase of the emulsion.

L'invention concerne des émulsions contenant un liquide hydrocarbure en phase continue ainsi que de l'alcool et/ou de l'eau en phase dispersée. On stabilise ces émulsions à l'aide d'un émulsifiant et d'un agent de couplage. L'émulsifiant est un copolymère contenant au moins un bloc polymère de styrène, relativement hydrophobe, ou un monomère de styrène à substitution dans le noyau, ainsi qu'au moins un bloc polymère relativement hydrophile d'au moins un monomère, comme de l'oxyde d'éthylène, choisi dans le groupe correspondant à la formule H(O-R)nOH où R représente un radical aliphatique contenant 1 à 4 atomes de carbone et n est un nombre compris entre 20 et 300. L'agent de couplage est un copolymère contenant au moins un bloc polymère de styrène, ou un monomère de styrène à substitution dans le noyau, ainsi qu'au moins un bloc d'une fraction hydrocarbure aliphatique saturée ou non, comme du butadiène. L'émulsifiant est présent en quantité suffisante, d'une part, pour former les micelles du bloc polymère relativement hydrophile, et d'autre part, pour contenir la phase dispersée, et l'agent de couplage est présent, d'une part en quantité suffisante pour sensiblement empêcher les gouttelettes de la phase dispersée de subir une coalescence, et d'autre part en quantité insuffisante pour que les micelles des blocs polymères à base de styrène de l'agent de couplage puissent former la phase continue de l'émulsion.

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