Method and composition to decrease iron sulfide deposits in pipe lines
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[0018] The compositions of this invention are particularly effective at complexing and solubilizing iron sulfide. According to one aspect of the invention, this result is readily achieved by providing one or more compounds of Formula (I) in admixture with at least one amine or ammonium derivative thereof. The anion X balances the net positive charge of one or more
phosphonium cations. Typically, n in Formula (I) is 1, 2, or 3. Thus, X is typically a monoanion, dianion, or trianion, respectively.
[0019] While any routinely accessible anion X can be used, it is preferred that X is chosen such that compounds of Formula (I) are soluble in water, alcohols, or in mixtures thereof. Thus, suitable monoanions include halides such as chloride, bromide, and iodide. Also contemplated are lower alkyl carboxylates, wherein the term “lower alkyl” refers to a straight or branched C1-C6 alkyl group. Exemplary lower alkyl carboxylates are methyl carboxylate (i.e., acetate), ethyl carbo...
Example
EXAMPLE 1
Composition Generated from Tetrakis(hydroxymethyl)phosphonium sulfate (THPS) and Ammonium Chloride
[0065] A. Tetrakis(hydroxymethyl)phosphonium sulfate (THPS) is obtained commercially as a 75-90 weight % aqueous solution with pH that varies below 4. The following procedure yielded 1000 g of a 5% aqueous composition able to complex iron sulfide. 66.6 grams of 75 weight % THPS (in water) and 0.5 grams ammonium chloride were combined, diluted with 90 grams of water, and then mixed. A sufficient amount of a 30% weight aqueous solution of sodium or potassium hydroxide was added to raise the pH to about 6.5. The total weight of the product was brought to 1000 grams by adding water, whereupon the pH was remeasured. After dilution, pH can be readjusted slightly, if necessary, to the desired value.
[0066] In this example, water can be replaced with methanol in varying amounts to produce solutions with as little as 0% water and as much as 95% water, depending upon the overall relati...
Example
EXAMPLE 2
Composition Generated from Tetrakis(hydroxymethyl)phosphonium sulfate (THPS) and Methylamine
[0068] Following the procedure in Example 1, a 5% by weight composition was prepared by 1) combining 6.66 g of tetrakis(hydroxymethyl)phosphonium sulfate in the form of its 75% aqueous solution by weight with enough water to make 90 mL of solution, 2) adding concentrated (12M aqueous KOH) caustic to form TRIS (95% conversion) at a pH of 7.7, 3) diluting with water to 100 mL, 4) adding 0.263 grams of methylamine, and 5) mixing. The mole ratio of TRIS to amine in this mixture is 2.6:1.
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