Abstract:
A method for oxidative brightening and whitening of a mined mineral is provided. The mined mineral to be brightened may be discolored kaolin clay, such as gray clay. The inventive method comprises adding to an aqueous slurry of a mined mineral to be brightened an oxidizing solution comprising a peroxyacid, such as performic acid and recovering bleached mineral of improved brightness, color and/or improved purity compared to the mineral to be brightened.
Abstract:
Peroxyhydroxycarboxylic acid forming compositions and methods for forming peroxyhydroxycarboxylic acids, preferably in situ, using the peroxyhydroxycarboxylic acid forming compositions are disclosed. Methods of using the peroxyhydroxycarboxylic acids, including for treating a surface or a target in need of antimicrobial or sanitizing treatment are also disclosed. Particular applications of using odor-free, low volatility peroxyhydroxycarboxylic acid sanitizers for direct food contact are disclosed.
Abstract:
The invention concerns a method for preparing a mixture containing cyclohexanol and cyclohexanone, comprising the step of hydrogenating cyclohexyl hydroperoxide in cyclohexane in the presence of a Raney nickel catalyst to give cyclohexanol and cyclohexanone.
Abstract:
Peroxyformic acid compositions for treatment and removal of biofilm growth and mineral deposits on membranes for energy services applications are disclosed. In particular, peroxyformic acid compositions are generated in situ or on site generation for the reduction and prevention, of biofilms and the mitigation of mineral buildup on the membranes. The compositions according to the invention are compatible with the membranes under application of use conditions.
Abstract:
The present invention relates generally to methods for forming peroxyformic acid, comprising contacting formic acid with hydrogen peroxide. The methods for forming peroxyformic acid can include adding formic acid with a relatively lower concentration of hydrogen peroxide, or adding formic acid to a peroxycarboxylic acid composition or forming composition to react with hydrogen peroxide in the compositions. The present invention also relates to peroxyformic acid formed by the above methods. The present invention further relates to the uses of peroxyformic acid for treating a variety of targets, e.g ., target water, including target water used in connection with oil- and gas-field operations. The present invention further relates to methods for reducing or removing H 2 S or iron sulfide in the treated water source, improving clarity of the treated water source, or reducing the total dissolved oxygen or corrosion in the treated water source, using peroxyformic acid, including peroxyformic acid generated in situ.
Abstract:
The present invention relates to perpropionic acid compositions that are stable in a basic medium, to a method for stabilizing the perpropionic acid, and also to the use of a specific combination of compounds for stabilizing the perpropionic acid in a basic medium.
Abstract:
The present invention relates to a process for the preparation of a solution comprising a first peroxy acid comprising performic acid and a second peroxy acid, said process comprising forming a carboxylic acid solution comprising a first carboxylic acid comprising formic acid, a second carboxylic acid and hydrogen peroxide, wherein the amount of formic acid is from 0.5 to 20 % by weight of the amount of the second carboxylic acid, and allowing the components to react to form a solution comprising performic acid and said second peroxy acid, the amount of peroxy acids being at least 5 % by weight. The invention also relates to a storable solution comprising performic acid and said second peroxy acid. The solution can be used as a disinfecting agent for controlling micro-organisms.
Abstract:
A peroxycarboxylic acid represented by the general formula (I): (wherein R1 represents a substituted or unsubstituted C1-C10 alkyl group, or a substituted or unsubstituted C6-C10 aryl group, L represents a substituted or unsubstituted C2-C12 divalent linking group, or R1 and L may combine to form a ring) and a composition comprising said peroxycarboxylic acid are provided. Said peroxycarboxylic acid can sterilize a medical apparatus such as endoscope in a short period of time and has no unpleasant smell.
Abstract:
The invention relates to a method for the continuous production of a mixture of substances or a reaction mixture formed by the reaction of components contained therein. The component fluxes drawn from a storage container (1, 2 or 3) or a distribution network (12) are respectively channelled via a control path (22, 23, 24, 25), each path comprising a flowmeter device (8, 9, 10, 11) and a control organ (34, 35, 36, 37). The mass fluxes of the individual components are controlled in proportion to the mass flux of a first component. The resultant controlled mass fluxes are introduced into a reservoir either directly, or once the individual mass fluxes have been partially or fully combined. The method and the device are particularly suitable for the on-site production of non-transportable mixtures of substances, or mixtures of substances that are costly to transport, such as highly concentrated peroxycarboxylic acid solutions.
Abstract:
The invention relates to a process for the preparation of a peracid, perester or diacylperoxide and is characterized in that a mixed anhydride of formula: R [C(O)OC(O)OR ]n or [R C(O)OC(O)O]pR is contacted with a hydroperoxide of formula: R [OOH]m in the presence of a base, wherein R represents a mono-, di-, tri- or tetravalent C1-C19 hydrocarbon group, optionally containing one or more hetero atoms, n is 1-4, R represents a C1-C20 hydrocarbon group, optionally containing one or more hetero atoms, R represents a C1-C19 hydrocarbon group, optionally containing one or more hetero atoms, R represents a di-, tri- or tetravalent C1-C20 hydrocarbon group, optionally containing one or more hetero atoms, p is 2-4, R represents hydrogen or a mono- or divalent C3-C18 tertiary alkyl or C2-C20 acyl group, in which the tertiary alkyl or acyl group may optionally contain one or more hetero atoms, m is 1 or 2, and if R represents hydrogen, m is 1, provided that if the hydroperoxide is an alpha , alpha -dihydroperoxyperoxide, the reaction is not carried out in an inert two-phase solvent system comprising a polar solvent and an polar solvent. The invention also relates to a hydroxyperacid, hydroxyperester, and hydroxydiacylperoxide obtainable by said process and the use of said hydroxyperoxides.