Methods for treating hydrocarbon recovery operations and industrial waters
AssigneePetrolite Corporation
InventorsNeil E. S. Thompson, Robert G. Asperger
Life of this patent
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Abstract
Certain dithiocarbamates are used as reverse demulsifiers, corrosion and scale inhibitors, flocculants, biocides, flotation aids, water clarifiers, interface control agents and antifoaming agents.
Claims22
A method of water clarification by demulsification of an oil emulsion from an aqueous effluent and the removal of the separated oil to produce clarified water comprising adding to said aqueous effluent an effective demulsifying amount of a compound having the formula ##STR23## wherein .circle.T is hydrogen, C(.dbd.S)SR.sub.2, ##STR24## with the proviso that at least two .circle. 's are C(.dbd.S)SR.sub.2 ;
- R is an alkylene having 2-30 carbon atoms;
- R.sub.1 is hydrogen or an alkyl having 1-30 carbon atoms;
- R.sub.2 is an alkali metal, an alkaline earth metal, or N(R.sub.3).sub.4 where R.sub.3 is a lower alkyl;
- R.sub.4 is C.sub.2 -C.sub.4 alkylene;
- x is an integer of 3-200;
- and n is an integer of 1-10 and removing the resulting separated oil from the effluent.
A method of water clarification by demulsification of an oil emulsion from an aqueous effluent and the removal of the separated oil to produce clarified water comprising adding to said aqueous effluent an effective clarifying amount of a compound having the formula
- R[NHC(.dbd.S)SR.sub.2 ].sub.n
- wherein R is a divalent, trivalent or tetravalent saturated hydrocarbon radical;
- n is an integer corresponding to the valence of R;
- R.sub.2 is an alkali metal, an alkaline earth metal or N(R.sub.3).sub.4 where R.sub.3 is a lower alkyl and removing the resulting separated oil from the effluent.
A method of water clarification by demulsification of an oil emulsion from an aqueous effluent and the removal of the separated oil to produce clarified water comprising adding to said aqueous effluent an effective clarifying amount of a compound having the formula ##STR25## wherein R.sub.4 is an alkylene having 2-30 carbon atoms and R.sub.2 is an alkali metal, alkaline earth metal or N(R.sub.3).sub.4 where R.sub.3 is a lower alkyl and removing the resulting separated oil from the effluent.
A method of water clarification by demulsification of an oil emulsion from an aqueous effluent and the removal of the separated oil to produce clarified water comprising adding to said aqueous effluent an effective clarifying amount of a compound having the formula ##STR26## wherein R and R.sub.1 are hydrogen, alkyls or cyclic hydrocarbons having 1-30 carbon atoms with the proviso that only one of R and R.sub.1 may be hydrogen;
- and R.sub.2 is an alkali metal, alkaline earth metal or N(R.sub.3).sub.4 where R.sub.3 is a lower alkyl and removing the resulting separated oil from the effluent.
Dependencies are inferred from the claim text.