Colloid systems and wetting agents; subcombinations thereof; pro – Compositions containing an agent for breaking ; processes of... – Continuous liquid phase colloid system and discontinuous...
Patent
1998-09-25
2000-06-27
Lovering, Richard D.
Colloid systems and wetting agents; subcombinations thereof; pro
Compositions containing an agent for breaking ; processes of...
Continuous liquid phase colloid system and discontinuous...
516189, 508472, 526320, B01D 1705, C08F22018, C08F 814, C08F 800
Patent
active
060807946
DESCRIPTION:
BRIEF SUMMARY
SPECIFICATION
1. Field of the Invention
The invention relates to demulsifiers on the basis of polyalkyl (meth)acrylate (PAMA) oligomers/polymers.
2. State of the Art
Agents which destroy emulsions are referred to as demulsifiers in the most general sense. Their method of effect is described, for example, in such a way that they change the existing surface film and thereby cause the dispersed phase to flow together (coalescence) (see Winnacker-Kuchler 4th edition, Vol. 7, 95 C. Hanser 1986). Therefore certain surfactant groups are used as demulsifiers because of their surfactant effect, for example block copolymerizates. Technical fields of use for demulsifiers exist, for example, in petroleum processing and in hydraulic fluids (see Ullmann's Encyclopedia of Industrial Chemistry, 5th Ed., Vol. A13, 169, VCH 1989; Surfactants Science Series Vol. 13, K. K. Lissant, ed., Demulsification, M. Dekker 1983).
DE 39 06 702 (Th. Goldschmidt AG) describes polyacrylates which are subsequently modified with alkoxylates. They are used as W/O emulsifiers. Polymethacrylates are not mentioned. Use of the products as demulsifiers is not mentioned.
DE 44 23 358 (Rohm GmbH) describes dispersant PAMA oligomers with alkoxylated methacrylates for the main use of a dispersant additive for lubricant oils, particularly for motor oils, so-called ashless dispersants. Experience has shown that these compounds possess an effect that tends to be harmful to demulsification. From the practice of additive production, it is generally known that contaminants with dispersant additives severely impair the demulsifying effect of hydraulic oils.
Therefore a conclusion concerning demulsifying properties is not possible from the dispersant additives described in DE 44 23 358.
In Houben/Weyl, Vol. I, p. 219 (1958), the general knowledge that practically any emulsifier can also be used as a demulsifier is stated. However, this general knowledge cannot be transferred to the complicated relationships which exist for mineral oils. The number of the compounds to be studied is so large that no general survey is possible, so that no targeted information concerning the solution according to the invention can be derived from the general literature.
The addition of demulsifiers as additives in hydraulic fluids on a mineral oil basis serves to separate oil and water. The additives used are classified as "ionogenic and non-ionogenic polar compounds" and their effect is described as an interaction with the oil-water boundary.
However, demulsifiers represent only a small part of the additives present in hydraulic fluids, on the average (see Ullmann's Encyclopedia, Vol. A13, loc. cit.). The requirement of rapid separation of the water is particularly urgent for hydraulic fluids.
Because of the complex interplay of the different additive components in the formulations, and because of the partly massive influence of trace contaminants, this requirement is not easy to meet. On the other hand, the use of certain substances of the type of ionogenic and non-ionogenic polar compounds in hydraulic fluids is only possible if the components are sufficiently compatible with one another. Understandably, the incompatibility phenomena are all the less to be expected, the lower the concentration of the individual additives.
PAMA oligomers with alkoxylated methacrylic acid ester radicals, with a dispersant effect, are described in the (non-published) German patent application P 44 23 258.2. There, oligomers with up to 40 wt.-% of alkoxylated comonomer are claimed. For the main area of application described in the German patent application, that of an "ashless dispersant" for motor oils, the preferred compositions are approximately 10-25 wt.-% of alkoxylated comonomer. Use as demulsifiers is not provided in the stated application, and could also not be expected on the basis of these facts.
The present invention is based on the recognition that polyalkyl (meth)acrylate (PAMA) oligomers or polymers with alkoxylated alkyl ester radicals are very well suited as demulsifiers. These (P
REFERENCES:
patent: 2499369 (1950-03-01), DeGroote et al.
patent: 4582628 (1986-04-01), Buriks et al.
patent: 4678599 (1987-07-01), Fock et al.
patent: 5188770 (1993-02-01), Pennewiss
patent: 5196486 (1993-03-01), Stephenson
patent: 5661220 (1997-08-01), Faul et al.
patent: 5691284 (1997-11-01), Beyer et al.
patent: 5712359 (1998-01-01), Auschra et al.
patent: 5773505 (1998-06-01), Pennewiss et al.
Auschra Clemens
Boehmke Uwe
Neusius Michael
Pennewiss Horst
Lovering Richard D.
Metzmaier Daniel S.
Roehm GmbH
LandOfFree
Demulsifiers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Demulsifiers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Demulsifiers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1785221