# US 5,707,531 A · Process for breaking oil emulsions

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- Number: US 5,707,531 A
- Document ID: US5707531A
- Status: Granted
- Kind: A
- Application number: 08/693,921
- Filed: 1996-08-05
- Granted: 1998-01-13
- Earliest claimed: 1995-08-11
- Assignees: Bayer Aktiengesellschaft
- Inventors: Bernhard Lehmann; Ulrich Litzinger
- Web page: https://patentgrep.com/patent/US5707531A

## CPC

- B01D 17/047: {with separation aids}
- C08L 79/02: Polyamines
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Oil emulsions are broken in a particularly advantageous manner by adding to them a breaker which comprises poly-DADMAC and polyalkylenepolyamines.

## Claims

### Claim 1

A process for breaking oil emulsions, wherein mixtures which comprise poly-diallyldimethylammonium chloride and polyalkylenepolymaine are employed as breakers, wherein the relative amounts of poly-diallyldimethylammonium chloride to polyalkylenepolyamine are 25 to 75:75 to 25% by weight, said poly-diallyldimethylammonium chloride, as a 35% strength by weight solution in water, having a viscosity of 2,000 to 20,000 mPa.s at 25.degree. C., and said polyalkylenepolyamine, as a 25% strength by weight solution in water, having a viscosity of 200 to 800 mPa.s at 25.degree. C.

### Claim 2 (depends on 1)

The process of claim 1, wherein the breaker mixture comprises up to 5% by weight of a monobasic mineral acid.

### Claim 3 (depends on 1)

The process of claim 1, wherein the breaker comprises poly-diallyldimethylammonium chloride and polyalkyleneamine to the extent of 95 to 100% by weight.

### Claim 4 (depends on 3)

The process of claim 3, wherein the relative amounts of poly-diallyldimethylammonium chloride:polyalkylenepolyamine are 30 to 40:70 to 60% by weight.

### Claim 5 (depends on 1)

The process of claim 1, wherein the breaker is employed as an aqueous solution which comprises 5 to 60% by weight of the sum of the anhydrous components poly-diallyldimethylammonium chloride and polyalkylenepolyamine.

### Claim 6 (depends on 1)

The process of claim 1, wherein 0.01 to 0.2% by weight of breaker, calculated without water contents, based on the emulsion to be broken, is employed.