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AssigneePetrolite Corporation
InventorKevin J. McCarthy
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A method is disclosed for controlling foam in a fermentation broth by adding to the fermentation broth an effective amount of a composition comprising a compound corresponding to the formula: ##STR1## wherein AO is an oxyalkylene copolymer moiety of oxypropylene and oxyethylene units, each oxyalkylene copolymer moiety having a molecular weight of at least about 300 and an oxypropylene to oxyethylene molar ratio of from about 2:1 to about 10:1, n is an integer from about 1 to about 20, R is an alkyl group of from about three to about twelve carbon atoms, and R' is methylene or substituted methylene. The composition can be added to fermentation broths to prevent the formation of foam or to reduce foam which has already formed. The above defined composition is also disclosed in a form free of solvent, such as xylene.
A method for controlling foam in a fermentation broth comprising adding to the fermentation broth an effective amount of a composition comprising a compound corresponding to the formula:
A method for inhibiting or reducing foam in a fermentation broth comprising adding to a fermentation broth an effective amount of a composition produced by reacting an alkylphenol wherein the alkyl group has from about three to about twelve carbon atoms, with a lower aldehyde in a condensation reaction to produce a condensation product containing a plurality of phenolic units and polyoxyalkylating the condensation product to produce a polyaryalkylated product by subjecting the condensation product to dehydration conditions in the presence of about five or more moles of propylene oxide and about one or more moles of ethylene oxide per mole of phenolic units, the molar ratio of propylene oxide to ethylene oxide being from about 2:1 to about 10:1.
Dependencies are inferred from the claim text.