Use of demulsifying mixtures for breaking petroleum emulsions

Claim 2

An emulsion-breaking composition comprising about 70 to 99.8% by weight of at least one silicon-free demulsifier selected from the group consisting of I. reaction product of oxyalkylated phenol-formaldehyde resin with a dicarboxylic acid selected from the group consisting of saturated aliphatic dicarboxylic acids having 10 or less carbon atoms and benzene dicarboxylic acid, and II. reaction product of a block and mixed polymerizate of propylene oxide and ethylene oxide with a dicarboxylic acid selected from the group consisting of saturated aliphatic dicarboxylic acids having 10 or less carbon atoms and benzene dicarboxylic acid, and III. reaction product of a mixture of oxyalkylated phenolformaldehyde resin and block and mixed polymerizates of propylene oxide and ethylene oxide with a dicarboxylic acid selected from the group consisting of saturated aliphatic dicarboxylic acids having 10 or less carbon atoms and benzene dicarboxylic acid, and about 0.2 to 30% by weight of a mixed polyoxyalkylene-polysiloxane block polymerizate, the polyoxyalkylene blocks of which have a molecular weight of about 500 to 4000 and are composed of polyoxyethylene and polyoxypropylene blocks in a weight ratio of 40 to 60 to 100:0, and the polysiloxane blocks of which contain 3 to 50 silicon atoms per block.

Claim 3

A composition according to claim 1 in which the mixed polyoxyalkylene-polysiloxane block polymerizate is employed in a quantity of about 0.5 to 10% by weight.

Claim 4

A composition according to claim 1 in which the silicon-free demulsifier is employed in a quantity of about 90 to 99.5% by weight.

Claim 5

A composition according to claim 1 in which the polyoxyalkylene block has the formula ##STR20## in which: n is 2.0 to 2.6, m is a number such that the block molecular weight is between about 500 and 4000, Z is an alkyl or aryl residue of an alcohol, and r corresponds to the valence of the alcohol.

Claim 6

A composition according to claim 1 in which the polysiloxane block has the formula ##STR21## in which: a and b are numbers such that the block contains 3 to 50 silicon atoms, c is 0 or 1, and M is an alkyl group.

Claim 7

A composition according to claim 1, in which the polysiloxane block has the formula ##STR22## in which: M is an alkyl group, c is 0 or 1, and d and e are numbers totaling 1 to 48.

Claim 8

A composition according to claim 1 in which the polysiloxane block has the formula ##STR23## in which: M is an alkyl group, c is 0 or 1, and d and e are numbers totaling 1 to 48, with d being at least 1.

Claim 9

An emulsion-breaking composition comprising about 70 to 99.8% of a silicon-free demulsifier wherein the demulsifier is a cross-linked product of a polypropylene glycol-ethylene oxide polyadduct and of a nonylphenol-formaldehyde resin reacted with an ethylene oxide, and about 0.2 to 30% by weight of a mixed polyoxyalkylene-polysiloxane block polymerizate of the HABAH formula, where ##STR24##

Claim 10

An emulsion-breaking composition comprising about 70 to 99.8% of a silicon-free demulsifier wherein the demulsifier is a cross-linked product of a polypropylene glycol-ethylene oxide polyadduct and of a nonylphenol-formaldehyde resin reacted with an ethylene oxide, and about 0.2 to 30% by weight of a mixed polyoxyalkylene-polysiloxane block polymerizate of the HABAH formula, where ##STR24##

Claim 11

A process of breaking an emulsion which comprises mixing the emulsion with a composition comprising about 70 to 99.8% by weight of at least one silicon-free demulsifier selected from the group consisting of I. reaction product of oxyalkylated phenol-formaldehyde resin with a dicarboxylic acid selected from the group consisting of saturated aliphatic dicarboxylic acids having 10 or less carbon atoms and benzene dicarboxylic acid, and II. reaction product of a block and mixed polymerizate of propylene oxide and ethylene oxide with a dicarboxylic acid selected from the group consisting of saturated aliphatic dicarboxylic acids having 10 or less carbon atoms and benzene dicarboxylic acid, and III. reaction product of a mixture of oxyalkylated phenolformaldehyde resin and block and mixed polymerizates of propylene oxide and ethylene oxide with a dicarboxylic acid selected from the group consisting of saturated aliphatic dicarboxylic acids having 10 or less carbon atoms and benzene dicarboxylic acid, and about 0.2 to 30% by weight of a mixed polyoxyalkylene-polysiloxane block polymerizate, the polyoxyalkylene block of which have a molecular weight of about 500 to 4000 and are composed of polyoxyethylene and polyoxypropylene blocks in a weight ratio of 40 to 60 to 100:0, and the polysiloxane blocks of which contain 3 to 50 silicon atoms per block.

Claim 12

A process of breaking an emulsion which comprises mixing the emulsion with a composition comprising about 70 to 99.8% by weight of at least one silicon-free demulsifier selected from the group consisting of I. reaction product of oxyalkylated phenol-formaldehyde resin with a dicarboxylic acid selected from the group consisting of saturated aliphatic dicarboxylic acids having 10 or less carbon atoms and benzene dicarboxylic acid, and II. reaction product of a block and mixed polymerizate of propylene oxide and ethylene oxide with a dicarboxylic acid selected from the group consisting of saturated aliphatic dicarboxylic acids having 10 or less carbon atoms and benzene dicarboxylic acid, and III. reaction product of a mixture of oxyalkylated phenolformaldehyde resin and block and mixed polymerizates of propylene oxide and ethylene oxide with a dicarboxylic acid selected from the group consisting of saturated aliphatic dicarboxylic acids having 10 or less carbon atoms and benzene dicarboxylic acid, and about 0.2 to 30% by weight of a mixed polyoxyalkylene-polysiloxane block polymerizate, the polyoxyalkylene block of which have a molecular weight of about 500 to 4000 and are composed of polyoxyethylene and polyoxypropylene blocks in a weight ratio of 40 to 60 to 100:0, and the polysiloxane blocks of which contain 3 to 50 silicon atoms per block.

Claim 13

A process according to claim 9 in which the mixed polyoxyalkylene-polysiloxane block polymerizate is employed in a quantity of about 0.5 to 10% by weight.

Claim 14

A process according tp claim 9 in which the silicon-free demulsifier is employed in a quantity of about 90 to 99.5% by weight.

Claim 15

A process according to claim 9 in which the polyoxyalkylene block has the formula ##STR25## in which: n is 2.0 to 2.6, m is a number such that the block molecular weight is between about 500 and 4000, Z is an alkyl or aryl residue of an alcohol, and r corresponds to the valence of the alcohol.

Claim 16

A process according to claim 9 in which the polysiloxane block has the formula ##STR26## in which: a and b are numbers such that the block contains 3 to 50 silicon atoms, c is 0 or 1, and M is an alkyl group.

Claim 17

A process according to claim 9 in which the polysiloxane block has the formula ##STR27## in which: M is an alkyl group, c is 0 or 1, and d and e are numbers totaling 1 to 48.

Claim 18

A process according to claim 9 in which the polysiloxane block has the formula ##STR28## in which: M is an alkyl group, c is 0 or 1, and d and e are numbers totaling 1 to 48, with d being at least 1.