Defoamer and/or deareator on the basis of oil-in-water dispersions
AssigneeBASF SE
InventorsRainer Dyllick-Brenzinger, Erhard Guenther, Primoz Lorencak, Günther Glas, Johann Bonn
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Abstract
Antifoams and/or deaeraters based on oil-in-water dispersions contain, in the hydrophobic oil phase, 3-thiaalkan-1-ols, 3-thiaoxoalkan-1-ols, 3-thiadioxoalkan-1-ols, esters of said compounds or mixtures thereof as compounds having an antifoam and/or deaerating effect, and 3-thiaalkan-1-ols, 3-thiaoxoalkan-1-ols, 3-thiadioxoalkan-1-ols, esters of said compounds or mixtures thereof are used as antifoams and/or deaeraters.
Claims24
In a method of papermaking in which an antifoam and/or a deaerator is used, the improvement comprising using as said antifoam and/or deaerator, an antifoam and/or deaerator comprising an oil-in-water dispersion which contains, in the dispersed hydrophobic phase, at least one compound effective as an antifoam and/or deaerator and, if required, further components, wherein the hydrophobic phase contains 3-thiaalkan-1-ols, 3-thiaoxoalkan-1-ols, 3-thiadioxoalkan-1-ols, esters of said compounds or mixtures thereof as compounds having an antifoam and/or deaerating effect.
A method of controlling foam in an aqueous medium having a tendency to foam formation, comprising adding an oil-in-water dispersion to the aqueous medium in antifoam and/or deaerating amounts,
- wherein the oil-in-water dispersion contains, in the dispersed hydrophobic phase, at least one compound selected from the group consisting of a 3-thiaalkan-1-ol, a 3-thiaoxoalkan-1-ol, a 3-thiadioxoalkan-1-ol and esters of said compounds, and
- wherein the aqueous medium is a papermaking medium.
An oil-in-water dispersion which contains, in the dispersed hydrophobic phase,
- (a) at least one compound selected from the group consisting of a 3-thiaalkan-1-ol, a 3-thiaoxoalkan-1-ol, a 3-thiadioxoalkan-1-ol, and esters of said compounds,
- (b1) polyglyceryl esters which are obtainable by at least 20% esterification of polyglycerols which have at least 2 glycerol units with at least one C12- to C36-fatty acid and
- (b2) glyceryl esters of fatty acids having at least 10 carbon atoms in the molecule, C12- to C30-alcohols, alkoxylated alcohols esters of sugar alcohols having at least 4 OH groups or at least 2 OH groups and at least one intramolecular ether bond and of a fatty acid having at least 20 carbon atoms in the molecule fatty esters of C12- to C22-carboxylic acids with monohydric to trihydric alcohols ketones having melting points above 45° C. reaction products of mono- and diglycerides with dicarboxylic acids, reaction products of glycerol with dicarboxylic acids, which reaction products are esterified with at least one C12- to C36-fatty acid, polyethylene waxes, natural waxes, hydrocarbons having boiling points above 200° C., finely divided inert solids and mixtures of said compounds.
An antifoam and/or deaerator comprising an oil-in-water dispersion which contains, in the dispersed hydrophobic phase, at least one of each of the following (a), (b1) and (b2):
- (a) 3-thiaalkan-1-ols, 3-thiaoxoalkan-1-ols, 3-thiadioxoalkan-1-ols, carboxylic esters of said compounds or mixtures thereof,
- (b1) polyglyceryl esters which are obtainable by at least 20% esterification of polyglycerols which have at least 2 glycerol units with at least one C12- to C36-fatty acid and
- (b2) glyceryl esters of fatty acids having at least 10 carbon atoms in the molecule, C2- to C30-alcohols, alkoxylated alcohols, esters of sugar alcohols having at least 4 OH groups or at least 2 OH groups and at least one intramolecular ether bond and of a fatty acid having at least 20 carbon atoms in the molecule, fatty esters of C12- to C22-carboxylic acids with monohydric to trihydric alcohols, ketones having melting points above 45° C., reaction products of mono- and diglycerides with dicarboxylic acids, reaction products of glycerol with dicarboxylic acids, which reaction products are esterified with at least one C12- to C36-fatty acid, polyethylene waxes, natural waxes, hydrocarbons having boiling points above 200° C., finely divided inert solids and mixtures of said compounds.
Dependencies are inferred from the claim text.