System and method for generation of point of use reactive oxygen species
First Claim
1. A reactive oxygen species precursor formulation comprising a peracid concentrate capable of generating singlet oxygen, the peracid concentrate comprising a mixture of an alkaline concentrate, hydrogen peroxide and an acyl donor, wherein the molar ratio of hydrogen peroxide to acyl donor reactive groups is in the range of about 1:
- 1.25 to about 1;
4, and wherein the reactive oxygen species precursor formulation has a pH value ranging from about pH 9.5 to about pH 12.5 and a peracid anion to peracid molar ratio greater than about 1;
1, and wherein the peracid concentrate has a minimal hydrogen peroxide residual to minimize quenching of singlet oxygen.
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Abstract
Systems and methods for generating reactive oxygen species formulations useful in various oxidation applications. Exemplary formulations include singlet oxygen or superoxide and can also contain hydroxyl radicals or hydroperoxy radicals, among others. Formulations can contain other reactive species, including other radicals. Exemplary formulations containing peracids are activated to generate singlet oxygen. Exemplary formulations include those containing a mixture of superoxide and hydrogen peroxide. Exemplary formulations include those in which one or more components of the formulation are generated electrochemically. Formulations of the invention containing reactive oxygen species can be further activated to generate reactive oxygen species using activation chosen from a Fenton or Fenton-like catalyst, ultrasound, ultraviolet radiation or thermal activation. Exemplary applications of the formulations of the invention among others include: cleaning in place applications, water treatment, soil decontamination and flushing of well casings and water distribution pipes.
36 Citations
16 Claims
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1. A reactive oxygen species precursor formulation comprising a peracid concentrate capable of generating singlet oxygen, the peracid concentrate comprising a mixture of an alkaline concentrate, hydrogen peroxide and an acyl donor, wherein the molar ratio of hydrogen peroxide to acyl donor reactive groups is in the range of about 1:
- 1.25 to about 1;
4, and wherein the reactive oxygen species precursor formulation has a pH value ranging from about pH 9.5 to about pH 12.5 and a peracid anion to peracid molar ratio greater than about 1;
1, and wherein the peracid concentrate has a minimal hydrogen peroxide residual to minimize quenching of singlet oxygen. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- 1.25 to about 1;
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8. A method for oxidizing a contaminant, comprising:
- contacting a reactive oxygen precursor formulation with an aqueous stream containing the contaminant, wherein the reactive oxygen precursor formulation comprises;
a peracid concentrate capable of generating singlet oxygen, the peracid concentrate comprising a mixture of an alkaline concentrate, hydrogen peroxide and an acyl donor, wherein the molar ratio of hydrogen peroxide to acyl donor reactive groups is in the range of about 1;
1.25 to about 1;
4, and wherein the reactive oxygen species precursor formulation has a pH value ranging from about pH 9.5 to about pH 12.5 and a peracid anion to peracid molar ratio greater than about 1;
1, and wherein the peracid concentrate has a minimal hydrogen peroxide residual to minimize quenching of singlet oxygen;wherein the contacting of the reactive oxygen precursor formulation with the aqueous stream generates a reactive oxygen species and oxidizes the contaminant. - View Dependent Claims (9, 10, 11, 12)
- contacting a reactive oxygen precursor formulation with an aqueous stream containing the contaminant, wherein the reactive oxygen precursor formulation comprises;
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13. A method for oxidizing a contaminant, comprising:
- contacting a reactive oxygen precursor formulation with one of a hydraulic fracturing water, a produced water from a subsurface formation or an oil and/or gas production well water containing the contaminant, wherein the reactive oxygen precursor formulation comprises;
a peracetate concentrate capable of generating singlet oxygen, the peracetate concentrate comprising a mixture of an alkaline concentrate, hydrogen peroxide and an acyl donor, wherein the molar ratio of hydrogen peroxide to acyl donor reactive groups is in the range of about 1;
1.25 to about 1;
4, and wherein the reactive oxygen species precursor formulation has a pH value ranging from about pH 9.5 to about pH 12.5 and a peracetate anion to peracetic molar ratio greater than about 1;
1, and wherein the peracetate concentrate has a minimal hydrogen peroxide residual to minimize quenching of singlet oxygen;wherein the contacting of the reactive oxygen precursor formulation with the one of the hydraulic fracturing water, the produced water from a subsurface formation or the oil and/or gas production well water generates an oxygen species and oxidizes the contaminant. - View Dependent Claims (14, 15, 16)
- contacting a reactive oxygen precursor formulation with one of a hydraulic fracturing water, a produced water from a subsurface formation or an oil and/or gas production well water containing the contaminant, wherein the reactive oxygen precursor formulation comprises;
Specification