Defoaming agent and/or deaerator for aqueous media tending...

B - Operations – Transporting – 01 – D

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B01D 19/04 (2006.01) D21H 21/12 (2006.01)

Patent

CA 2493055

The invention relates to a defoaming agent and/or deaerator based on oil-in- water dispersions, the oil phase of which contains at least one compound from the group of alcohols comprising at least 12 C atoms, alkoxylated fat alcohols, monoglycerides, diglycerides, and triglycerides of fatty acids, fatty acid ester from carboxylic acids comprising at least 12 C atoms and monovalent to trivalent alcohols comprising 3 to 22 C atoms, hydrocarbons having a boiling point of more than 200 ~C, fatty acids comprising 12 to 22 C atoms, 3-thiaalkane-1-ole, 3-thiaoxide alkane-1-ole, 3-thiadioxide-alkane-ole, and ester of the thiaalkane compounds in combination with (i) at least one polyglycerine that is obtained by esterification of at least 20 percent of polyglycerine with a carboxylic acid comprising 12 to 36 C atoms, and (ii) at least one bisamide consisting of ethylene diamine and carboxylic acids comprising 10 to 36 C atoms while the aqueous phase thereof contains at least one stabilizer, water, and an optional thickener, for aqueous media that tend to foam. Also disclosed is the use of said defoaming agent and/or deaerator for controlling foam in media tending to foam, particularly for controlling foam during cellulose boiling, cellulose washing, grinding of paper pulp, paper production, and dispersion of pigments used for paper production.

Agents antimoussants et / ou désaérants à base de dispersions huile dans l'eau dont la phase huile contient au moins un composé du groupe des alcools ayant au moins 12 atomes de C, des alcools gras alcoxylés, des mono-, di- et triglycérides d'acides gras, des esters d'acide gras dérivés d'acides carboxyliques ayant au moins 12 atomes de C et d'alcools monovalents à quadrivalents ayant 1 à 24 atomes de C, des hydrocarbures à point d'ébullition supérieur à 200 ·C, des acides gras ayant 12 à 22 atomes de C, des 3-thiaalcan-1-oles, des 3-thiaoxydalcan-1-oles, des 3-thiadioxydalcan-oles et des esters des composés thiaalcane en combinaison avec (i) au moins un ester de polyglycérine obtenu par estérification à au moins 20 % de polyglycérine avec un acide carboxylique ayant 12 à 36 atomes de C, et (ii) au moins un bisamide d'éthylènediamine et d'acides carboxyliques ayant 10 à 36 atomes de C, et dont la phase aqueuse contient au moins un stabilisateur, de l'eau et éventuellement un épaississant. Lesdits agents antimoussants et désaérants sont adaptés pour des milieux aqueux tendant à former de la mousse. La présente invention concerne également l'utilisation desdits agents antimoussants et / ou désaérants pour lutter contre la formation de mousse de milieux aqueux tendant à former de la mousse, en particulier pour lutter contre la formation de mousse lors du lessivage de la cellulose, du lavage de la cellulose, du raffinage de la pâte à papier, de la fabrication du papier et de la dispersion de pigments pour la fabrication de papier.

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