| 摘要 |
A method for resolving an oil-and-water emulsion is disclosed. The method comprises adding to the emulsion (1) if the emulsion does not contain a desirably high concentration of polyvalent metal cations of at least one part per million by weight, an amount of polyvalent metal cations sufficient to result in the desirably polyvalent metal cation concentration in the emulsion, and (2) an effective demulsifying amount of a combination of a terminating agent that is either a non-emulsifying hydrotrope composition or a coupling agent, and a composition comprising a polydithiocarbamate compound comprising at least two groups represented by the formula -(OR1)xNHC(:S)SR2, wherein R1 represents an alkylene group of 1 to 30 carbon atoms, R2 represents an alkali or alkaline earth metal group or an ammonium group; and x represents an integer of from 1 to about 250 independently selected for each of such groups such that the total of the integers x is, on average, from 3 to about 250. Related compositions are also disclosed.
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