57 results about "Performic acid" patented technology

There are provided methods of treating edible matter comprising applying a composition comprising performic acid to the edible matter or a substrate therefor. Other embodiments are also disclosed.

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.

The invention concerns a method for bleaching different types of paper pulp in two steps at atmospheric pressure and at a temperature not higher than 100 DEG C. The first step consists in contacting the unbleached paste with a mixture of paracetic acid and performic acid. The second step consists in treating the bleached pulp derived from the first step, with a solution of soda and hydrogen peroxide. The resulting pulps exhibit a high index of whiteness and a degree of polymerisation close to unbleached pulps. The method is environmentally safe and non-polluting.

The invention relates to a formula of epoxy gutter oil plasticized PVC (Poly Vinyl Chloride). In a test, sulfuric acid is taken as a catalyst, hydrogen peroxide is taken as an oxygen supply agent, formic acid is taken as an oxygen receiving agent, and the epoxidation reaction conditions of gutter oil are researched in one step by adopting performic acid. The method is suitable for industrial popularization and application. Therefore, the optimal processing formula of the epoxy gutter oil plasticized PVC is designed by taking the epoxy gutter oil as a plasticizer in the PVC production process instead of the conventional dioctyl phthalate.

The invention relates to a method for producing hydrogen by selective dehydration of formic acid using a catalytic system consisting of a transition metal complex of transition metal salt and at least one tripodal, tetradentate ligand, wherein the transition metal is selected from the group comprising Ir, Pd, Pt, Ru, Rh, Co and Fe. The transition metal complex can be used either as a homogeneous catalyst or a heterogenised metal complex, which has been applied to a carrier.

Peroxyformic acid compositions for removal of biofilm growth and other contaminants and impurities from industrial processing hard surfaces are disclosed. In particular, peroxyformic acid compositions may be dosed on site and/or generated in situ for the reduction and prevention of biofilms on the hard surfaces. Methods of employing the peroxyformic acid compositions for removal of biofilm growth and other impurities such as aldehydes and alcohols from industrial CO₂ effluent are also disclosed which beneficially provide ambient biofilm control and break down more rapidly than other peracids, allowing for extended runs between CIP cleaning, including a reduction and/or elimination of cleaning of the scrubbers and other industrial surfaces.

The invention relates to a method for preparing epoxy flax oil plasticizers, and belongs to the technical field of material additives. The defects that in the existing epoxy flax oil preparing process, hydrogen peroxide is used as main oxidizing agents, devices are prone to being corroded, and the temperature performance of the synthesized product is low are overcome. The method includes the steps that ozonized ice is prepared to serve as oxidizing agents, then catalysis is carried out through formic acid, and the epoxy flax oil is prepared from flax oil. According to the method, as the common oxidizing agents are replaced by the ozonized ice, cost is saved, and meanwhile the devices are prevented from being corroded; the prepared epoxy flax oil is good in plasticity, and breaking elongation and impacting strength are improved by 30% to 50%; the production steps are simple, and cost is saved.

The invention discloses a preparation method of epoxidized solution polymerized styrene-butadiene rubber. According to the preparation method, performic acid is generated in situ by H2O2 and HCOOH peracid system under a mild reaction condition, and the performic acid and double bonds on a solution polymerized styrene-butadiene rubber (SSBR) molecular chain undergo epoxidation reaction in an organic phase to obtain the epoxidized solution polymerized styrene-butadiene rubber. Epoxy groups introduced into SSBR have relatively strong reaction activity and can improve the polarity of the SSBR molecular chain, enhance the interaction between the SSBR molecular chain and the packing and improve the compatibility between an SSBR rubber matrix and a reinforcing agent.

The invention discloses MoO3 composite carbon-dot lithium-ion battery anode material and a preparation method thereof. Ammonium molybdate is used as a material composite carbon dot to obtain a high-performance lithium-ion battery anode material; performic acid is used as an oxide to strip coal tar pitch to prepare a carbon dot, ammonium molybdate is then subjected as a raw material to the preparation of the MoO3 composite carbon-dot lithium-ion battery anode material by means of a hydrothermal process by using the carbon dot to induce oriented growth of molybdenum trioxide. The preparation method has the advantages of simplicity, short period, low energy consumption, good repeatability, high yield and the like; MoO3 composite prepared herein can relieve volumetric expansion and increase ion activated surface area, thereby increasing the specific capacity and cycle stability of a lithium-ion battery.

The invention relates to the field of textile technology, and provides a low-temperature weak-damage wool dyeing process. The low-temperature weak-damage wool dyeing process comprises the following steps of (1) carrying out pretreatment; (2) performing hydrogen peroxide-formic acid oxidation pretreatment; (3) carrying out dyeing; (4) performing pressure relief; (5) carrying out alkali color fixingtreatment; (6) carrying out soaping; (7) carrying out water washing; and (8) performing repairing treatment, and taking out of a cylinder. The process has the beneficial effects that (1) through a triple swelling synergistic effect of the formic acid-hydrogen peroxide oxidization system, dyeing under pressure and glutamine transaminase repairing, low-temperature dyeing can be realized and the damage to the wool fibers is reduced, the dyeing can be performed at the dyeing temperature of 75-80 DEG C, the dyeing time is shortened by 30-35%, and the problem of yellowing caused by long-term boiling dyeing of wools at a high temperature can be avoided; and 2) through the process, the dye uptake and the dyeing fastness are both improved by 5-6% compared with those in the conventional dyeing method, the fiber strength, breaking elongation, and the moisture regain rate are all improved in a relatively high degree, the use amount of dye is highly reduced, and the enterprise production cost is lowered.

The invention provides a preparation method of 5,6-epoxy-5,6-dihydro-beta-ionol, comprising the following steps of: selectively reducing carbonyl in 5,6-epoxy-5,6-dihydro-beta-irisone used as raw material by using NaBH4 and CeCl3.7H2O, and synthesizing to obtain the 5,6-epoxy-5,6-dihydro-beta-ionol, wherein the yield reaches 87.8-91.84 percent. The purity is higher than 95.00 percent by silicagel column separation. Compared with a preparation method reported in the literature of carrying out the epoxidation reaction of beta-ionol by using m-chlorobenzene performic acid in sodium bicarbonate and methylene dichloride at room temperature to obtain the 5,6-epoxy-5,6-dihydro-beta-ionol, the reaction time is greatly shortened, and the yield is obviously increased.

The invention relates to a regeneration animal-plant double-protein composite fiber spinning solution and a production method thereof. The protein regeneration composite fiber spinning solution includes an animal protein and/or a plant protein, the animal protein is sericin protein obtained by processing of reeling silk leftovers, and the plant protein is a protein obtained by extraction of multiploid locust leaves. The protein regeneration composite fiber spinning solution also includes the following components by weight: 0-40 parts of the animal sericin protein, 0-40 parts of the plant polyploid locust leaf protein, 58.6-74.4 parts of polyvinyl alcohol, 0.3-0.8 part of potassium sulfite or potassium bisulfite and 0.3-0.8 part of hydrogen peroxide, performic acid or peracetic acid; and then the composite spinning solution with the viscosity of 800-1200 centipoises is obtained by adding water and sodium hydroxide for copolymerization. According to the regeneration animal-plant double-protein composite fiber spinning solution and the production method thereof, the cost of fiber is reduced, the quality of products is improved, and the problems of chromaticity, color fastness, resistance to hot water and boiling water shrinkage of the fiber are solved.

The invention discloses a clean pulping catalyst and an application technology thereof. The clean pulping catalyst comprises 85% of pulping raw materials, 9% of catalytic solvent, 5% of solid catalyzer and 1% of preservative. The catalytic solvent is a mixed solution by mixing one aqueous solution of NaOH, KOH, Ca(OH)2, Na2CO3, K2CO3, NaHCO3, KHCO3 and Na2SiO3, of which the weight percentage concentration is 5-30% with an EDTA aqueous solution with the weight percentage concentration of 1-10% according to the weight ratio of 1:1; the solid catalyzer comprises an oxygen stabilizer and an additive, and the oxygen stabilizer comprises a mixture of one or two or more kinds of DMD, hydrogen peroxide, performic acid, peracetic acid, perpropionic acid, ozone, MgSO4 and MgC12 according to a randomproportion; the additive comprises ferrous sulfate and sodium sulfite. According to the technology, no waste medicine liquid is discharged, no waste water is discharged, and the technology is beneficial to environmental protection and has high innovation value in the papermaking industry.

The invention mainly discloses a one-pot process for preparing azithromycin. The method which allows azithromycin to be prepared through using erythromycin imino ether without an extraction intermediate comprises the following steps: carrying out catalytic hydrogenation of erythromycin imino ether, filtering out a catalyst, adding formate, fully reacting, filtering, recovering to dryness, adding acetone for dissolving, adding the formate, adding formaldehyde and formic acid in a dropwise manner, carrying out a methylation reaction under an acidic condition to obtain azithromycin, and re-crystallizing to obtain azithromycin dihydrate. The process which realizes one-pot of a reduction reaction and the methylation reaction through the application of the formate has the advantages of substantial shortening of the erythromycin imino ether-to-azithromycin production time, operation reduction, and reduction of the discharge of three wastes, has a yield 1-5% higher than original processes, and allows the product content to be 0.5-1.5% higher than that of the original processes.

The invention discloses an aluminum-plastic separating agent, which is prepared from the following raw materials in parts by weight: 1 to 2 parts of hydroxyethyl cellulose, 10 to 16 parts of formic acid, 1 to 2 parts of fatty acid diethanolamide, 2 to 4 parts of ethylenediamine tetraacetic acid, 20 to 30 parts of methyl methacrylate and 0.6 to 0.7 part of initiator. The polymer emulsion is obtained bypolymerization under the action of the initiator by taking ethylene diamine tetraacetic acid as adoping agent and blending the doping agent with methyl methacrylate monomer. The polymer emulsion has good permeability and surface activity, a small amount of aluminum oxide on an aluminum surface layer can be dissolved by formic acid, and obtained aluminum ions can be reacted and compounded with ethylenediaminetetraacetic acid, so that the dissolution of an aluminum oxide film on the plastic surface is promoted, and the separation effect is improved; according to the separation method disclosed by the invention, most of aluminum and plastic materials can be obtained, the loss is relatively less, and the requirement on equipment is also low.

The invention provides a preparation method of graphite oxide capable of being washed directly. The preparation method comprises the following steps that step one, crystalline flake graphite is takenas a raw material, a main intercalator and an auxiliary intercalator are added for intercalation treatment to obtain a graphite intercalation compound; the main intercalator is at least one of formicacid, acetic acid, phosphoric acid, concentrated nitric acid and concentrated sulfuric acid; the auxiliary intercalator is at least one of an aqueous hydrogen peroxide solution, performic acid and peracetic acid; step two, after redundant main intercalator and auxiliary intercalator of the graphite intercalation compound are filtered out, the filtered graphite intercalation compound is put into ice water, tiny impurity particles and water are filtered and washed off with a sieve, and the graphite intercalation compound with less impurities is obtained; step three, an oxidizing agent is added in the filtered graphite intercalation compound, oxidation is carried out for 0.5-50 hours under the condition of 0-45 DEG C, and the graphite oxide of which a PH value is 0-1 and capable of being washed directly by the water is obtained. By the method, the volume of the raw material is swelled to 300 times to 500 times or above.

The invention discloses a method for measuring the sulfur-containing amino acid content of Astragali mushroom, and relates to the field of measurement of amino acid content of the Astragali mushroom.The method comprises the following steps: performing performic acid oxidation protection on the Astragali mushroom serving as a raw material, performing acid hydrolysis, performing ultrafiltration centrifugation, performing derivatization by taking 2,4-dinitrofluorobenzene as a derivatization reagent, performing gradient elution on the obtained derivative sample liquid through high performance liquid chromatography and by taking acetonitrile-water and sodium acetate as flowing phases, detecting under the wavelength of 360 nm, separating derivatives of cysteic acid and methionine sulfone, measuring the peak area of a cystine standard product and a methionine standard product under different concentration gradient, drawing a standard curve, and measuring the cystin content and the methioninecontent separately to obtain the sulfur-containing amino acid content. According to the method, the requirement on instruments is low, the reaction condition does not need to be strictly limited, thequantity of the needed samples is small, the samples are not damaged, single component can be analyzed, and the method is a measuring method which is efficient, accurate, simple, convenient and easyto operate and low in price.

The invention discloses a method for preparing 5-hydroxymethylfurfural by catalyzing cellulose formate with a dimethyl sulfoxide-water cosolvent system. The method comprises the following steps: firstly, adding alpha-cellulose into a formic acid solution for oil-bath heating, and carrying out centrifugal filtration to obtain a reaction filtrate; carrying out rotary evaporation and concentration onthe reaction filtrate, pouring the filtrate into an ethanol solution, and carrying out centrifugal filtration to obtain a white precipitate; pouring the white precipitate into an ethanol solution, carrying out centrifuging and filtering, repeating the operation for three times, and implementing freeze-drying to obtain cellulose formate; finally, performing microwave catalytic conversion in a dimethyl sulfoxide water cosolvent system by taking alpha-cellulose or cellulose formate as a substrate, and hydrochloric acid and aluminum chloride as catalysts to obtain the 5-hydroxymethylfurfural. Cellulose is treated with formic acid for acidolysis and formylation to obtain cellulose formate, and aluminum chloride hydrochloride is used as a combined catalyst to directly and efficiently catalyze cellulose formate in a dimethyl sulfoxide water cosolvent system to prepare 5-hydroxymethylfurfural.

The present invention relates to preparation of epoxy karanja oil, epoxy karanja fatty acid methyl esters and their acylated derivatives. Accordingly karanja oil and karanja fatty acid methyl esters were epoxidised using performic acid method. Karanja oil and its fatty acid methyl esters were also hydroxylated to prepare their acyloxy derivatives (C₃, C₄ & C₆). Both the epoxy and acyloxy derivatives of karanja oil and its methyl esters were characterized by ¹H NMR and IR studies. The products were evaluated for acid value (A.V.), hydroxyl value (H. V.), iodine value (I. V.), viscosity, viscosity index (V.I.), pour point, flash point and copper strip corrosion and lubricant properties like oxidation stability, air release value, evaporation loss, rust prevention characteristics, hydrolytic stability, foam stability and load carrying capacity and found to be potential base stocks for hydraulic, metal working fluids and other industrial fluids.

The invention relates to a method for simultaneously determining the content of cystine and methionine in artificial tiger bone powder. The method comprises the following steps: (1) taking an artificial tiger bone powder sample, adding a performic acid solution to oxidize, adding hydrobromic acid to terminate oxidation, evaporating to dryness, adding hydrochloric acid to hydrolyze, evaporating todryness, dissolving with a derivative buffer solution, and deriving to obtain a test solution; (2) taking sulfoalanine and methionine sulfone reference substances, and dissolving the sulfoalanine andmethionine sulfone reference substances with a derivative buffer solution to derive to obtain a mixed reference substance solution; (3) carrying out chromatographic detection on the test solution andthe reference solution, wherein a chromatographic column takes cyano bonded silica gel as a filler; the column temperature is 20 DEG C; a mobile phase: A is a sodium acetate buffer solution; B is methanol-acetonitrile-water, and gradient elution is carried out; and (4) calculating to obtain the contents of sulfoalanine and methionine sulfone in the artificial tiger bone powder according to a detection result, and further calculating to obtain the content of cystine and methionine sulfone in the artificial tiger bone powder. The detection method is accurate, reliable, simple, convenient and rapid.

The invention relates to a method for simultaneously detecting various organic acid radicals and inorganic anions in harmful salt of cultural relics, and belongs to the technical field of preventive protection of cultural relics. The method comprises the following steps: preparing standard working solutions with gradient concentrations from five standard substances including formate, acetate, propionate, butyrate and valerate and a multi-element standard solution, and sequentially detecting the standard working solutions by adopting an ion chromatograph to obtain a chromatogram; drawing a standard curve and fitting a standard curve equation for the concentrations of the organic acid and the anions in the standard working solution according to the peak areas of different organic acid radicals and the anions; detecting the crystalline saline solution sample under the same chromatographic condition, and calculating the concentrations of the organic acid radicals and anions detected in the crystalline saline solution sample according to the standard curve equation; and calculating the mass fractions of the organic acid radicals and the anions in the crystalline salt according to the concentrations of the organic acid radicals and the anions detected in the crystalline salt aqueous solution sample. The method can be used for analyzing the types of environmental pollutants causing salt damage to cultural relics.

The invention provides a treatment method for oxide on the surface of copper. The treatment method comprises the following steps: (a) heating copper with the oxide on the surface under the inert gas shielding condition to obtain to-be-treated copper; and (b) enabling the to-be-treated copper obtained in (a) to make contact with formic acid gas to obtain copper with the oxide removed from the surface. Compared with the prior art, the treatment method provided by the invention has the advantages that the formic acid gas makes contact with the heated copper with the oxide on the surface, so thatthorough surface cleaning of the copper with the oxide on the surface is realized. The treatment method provided by the invention has a good treatment effect; the treated copper with the oxide removedfrom the surface has reduced surface roughness, high mean area and little pollution to the copper surface and can be directly used for copper bonding; and meanwhile, the treatment method is simple inprocess, lower in technological requirement and low in cost, and is suitable for industrial production.