Wastewater organic acid removal process
AssigneeBaker Hughes Incorporated
InventorsWilliam M. Brown, Maria Trevino
Life of this patent
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Abstract
A process for removing carboxylic acids from aqueous solutions using a composition of a polyaluminum chlorohydrate and a cationic polyelectrolyte is described. After or during the initial contact of the aqueous solution with the composition, an organic liquid may optionally be added after which separation into an aqueous phase and an organic phase occurs whereby the organic acids are removed in the organic phase. The preferred polyaluminum chlorohydrate is aluminum chlorohydrate, and the preferred cationic polyelectrolyte is a high molecular weight poly(dimethyl diallyl) ammonium chloride.
Claims17
A process for removing soluble alkali metal naphthenates from aqueous solutions in the absence of acidification of said aqueous solutions, comprising the steps of:
- contacting an aqueous solution containing soluble alkali metal naphthenates with an amount effective to precipitate the alkali metal naphthenates of a composition comprising about 10 to 50 wt. % of at least one polyaluminum chlorohydrate, the balance being water;
- forming a precipitate with the alkali metal naphthenates and the polyaluminum chlorohydrate in an aqueous phase;
- and
- separating the aqueous phase from the precipitate.
A process for removing soluble alkali metal naphthenates from aqueous solutions in the absence of acidification of said aqueous solutions, comprising the steps of:
- contacting an aqueous solution containing soluble alkali metal naphthenates with an amount effective to precipitate the alkali metal naphthenates of a composition comprising:
- about 10 to 50 wt. % of at least one polyaluminum chlorohydrate,
- about 0.75 to 25 wt. % of at least one cationic polyelectrolyte, and;
- the balance being water;
- forming a precipitate with the alkali metal naphthenates and the polyaluminum chlorohydrate in an aqueous phase;
- and
- separating the aqueous phase from the precipitate.
A process for removing soluble alkali metal naphthenates from aqueous solutions in the absence of acidification of said aqueous solutions comprising the steps of:
- contacting an aqueous solution containing soluble alkali metal naphthenates with an amount effective to precipitate the alkali metal naphthenates of a composition comprising:
- about 45 to about 50 wt. % of at least one polyaluminum chlorohydrate,
- about 0.75 to about 1.0 wt. % of at least one cationic polyelectrolyte having a molecular weight of from about 500,000 to about 750,000, and;
- the balance being water;
- forming a precipitate with the alkali metal naphthenates and the polyaluminum chlorohydrate in an aqueous phase;
- and
- separating the aqueous phase from the precipitate.
Dependencies are inferred from the claim text.