76 results about "Disulfite" patented technology

Membranes, for example immersed polymeric ultrafiltration or microfiltration membranes, are cleaned by contacting them with a chemical cleaner comprising one or more of a gluconate, a hydrosulfite, a metabisulfite or an acid, for example phosphoric acid. The membranes may have been exposed to organic or inorganic foulants, some of which may have resulted from pretreatment involving adding coagulants, for example coagulants containing iron or aluminum, to water to be treated. Methods for treating a waste cleaning solution were described.

Reduced aldehyde emissions during heated storage of a polyurethane resin are obtained by including at least one sulfurous compound selected from the group consisting of hydrogen sulfites and disulfites in the polyol component from which that polyurethane is produced. The amount of the sulfurous compound added is generally from 0.02 to 2.0 parts by weight for every 100 parts by weight of the polyol component.

The invention provides a method for preparing formaldehyde-free ethylene vinyl acetate emulsion. The ethylene vinyl acetate emulsion is obtained by copolymerization reaction of ethylene and / or polyvinyl alcohol with monomers such as vinyl acetate and the like in the existence of emulsifier and under the action of redox initiator, wherein pyrosulfite and / or sulfite serve as reducing agent, and organic hydrogen peroxide serves as oxidant. Ethylene vinyl acetate emulsion which completely contains no formaldehyde can be obtained by the method, the problems of yellowing, discoloring and the like can be avoided, and the formaldehyde-free ethylene vinyl acetate emulsion is uniform and stable in quality, wide in viscosity adjustable range, quick in curing, high in primary viscous force and wide in application range.

The invention discloses a fluid loss additive for drilling fluid and a preparation method thereof, belonging to the technical field of chemical drilling fluid treating agents for oilfields. The method comprises the following steps of: carrying out one-step reaction on phenol, formaldehyde, humate, pyrosulfite and anhydrous sulfite so as to obtain a sulfonated phenolic humic acid resin; in the presence of an initiator, carrying out graft copolymerization on the sulfonated phenolic humic acid resin and a mixture of sodium hydroxide, 2-acrylamide-2-methyl-propyl sulfonate, acrylamide and dodecylacrylamide; and carrying out drying and crushing on the obtained product so as to obtain sulfonated phenolic humic acid resin-alkenyl monomer graft copolymer. The fluid loss additive disclosed by the invention has the functions of controlling the rheological property of drilling fluid and reducing the high-temperature and high-pressure filter loss of drilling fluid, not only enhances the thermal stability of side chains of a chain polymer, but also improves the salt tolerance of a sulfonated phenolic resin, and guarantees that products have good properties under high temperature and high salt conditions.

The invention discloses a preparation process for an aliphatic concrete water reducing agent. Ketone and aldehyde compounds are used as condensation monomers, crystallized sulphite and pyrosulfite are used as sulfonating agents, and the aliphatic concrete water reducing agent is chemically synthesized in water solution. Waste crystallized sodium sulfite is adopted to replace partial sodium sulfite to produce the aliphatic water reducing agent, so the cost is greatly reduced; and products produced by the preparation process have short cycle, low energy consumption, less input equipment and reduction of environmental pollution.

The present invention discloses one kind of lichi and longan preservative with high preserving effect, no toxicity, no environmental pollution and low cost and suitable for industrial production. The preservative consists of queensland arrowroot powder and bisulfite, pyrosulfite or dithionite capable of releasing SO2 when reacting with water and air. When the preservative is used, it is packed into non-woven polypropylene pocket, the pocket is set inside non-woven polypropylene bag for holding lichi or longan, and the bag is sealed and set into some packing box, with the amount of the preservative being 3.1-8.6 % of the weight of lichi or longan.

An antistaling agent for shrimps is prepared from sulfite and the disperser chosen from carboxymethyl cellulose sodium, glycerine, sodium alginate, carragreenin and tween-80. Its application method includes dissolving it in water, stirring, and freezing to become antistaling ice for shrimps.

The invention discloses a method for quickly removing organic pollutants in water by utilizing pyrosulfite to activate ferrate and relates to a method for utilizing the pyrosulfite to activate the ferrate and produce intermediate-state iron (Fe (V) and Fe (IV)) so as to quickly oxidize and remove the pollutants in water. The method can be used for deep treatment of domestic sewage and can be also used for deep treatment of high-concentration organic wastewater. The method has the following advantages that 1, a green and safe solid agent is adopted, is convenient to transport and low in price, is applied to an existing process and does not need process transformation; 2, the conditions required by reaction are mild and facilitate actual application; 3, reactants are ferric iron and sulfate radicals, wherein the ferric iron has adsorption and coagulation enhancement effects and can promote removal of the pollutants, a coagulant can be subsequently added to further remove organic pollutants in water when needed, and the sulfate radicals are non-toxic and harmless and are background ions in the water; 4, the method has the higher oxidation efficiency, oxidation speed and oxidation capability to the pollutants.

The invention relates to a synthetic method of pyridinium hydroxy propyl sulfobetaine. The synthetic method comprises the following steps: sufficiently dissolving hydrosulphite or pyrosulfite in water at normal temperature, adding sodium sulfite as an auxiliary sulfonating agent to adjust the pH value of the system to be 5.2-5.5, and then adding polyether F-6 as a catalyst; then adding a complexing agent, controlling the environment conditions, adding epichlorohydrin, and carrying out loop-opening reaction to obtain 3-chloro-2-hydroxy propanesulfonate; adding pyridine to the system, controlling the temperature to carry out reflux reaction, adding triethylamine as an impurity removing agent, reacting for 1 hour, then dehydrating and decoloring, adjusting the pH to 2-5, and adding 4-hydroxyl-2, 2, 6, 6-tetramentylniperidine-1-oxygen radical as a stabilizer and a vitamin C derivative to obtain an aqueous solution of the pyridinium hydroxy propyl sulfobetaine. The pyridinium hydroxy propyl sulfobetaine synthesized by the synthetic method is produced by adopting a one-pot method, which accords with the electroplating industry development demands at present; the pyridinium hydroxy propyl sulfobetaine is low in impurity content, good in appearance and low in production cost.

The invention discloses a denitrification method combining a denitrification agent and ultraviolet light and belongs to the technical field of water treatment. The denitrification method comprises the following steps: adding the denitrification agent into water for treating, after uniformly mixing, irradiating by using the ultraviolet light; or leading the water for treating into an ultraviolet light reactor, directly adding the denitrification agent into the ultraviolet light reactor to finish the denitrification treatment, wherein the wavelength of the ultraviolet light is less than 400 nanometers; the used denitrification agent is composed of one or more of sulfite, hydrosulphite, sulfur dioxide, pyrosulfite, hydro-metabisulfite, thiosulfate, sulfide, sodium bisulfide, ferrous ion and iron ion; the denitrification agent is added according to the Mole equivalence ratio of sulfur contained in the denitrification agent to nitrogen contained in nitrogen pollutants in the water for treating of being (0.1-100):1. By using the denitrification method, the purpose of efficiently and harmlessly removing nitrate, nitrite, ammonia nitrogen, nitro substituted organic matters, nitroso substituted organic matters and azo compounds in the water is achieved.

The invention discloses a physicochemical-biological combined treating method for high-concentration organic pyrosulfite wastewater. The method comprises the following six steps: 1) Fenton oxidation; 2) neutralization with quicklime; 3) inclined-plate precipitation; 4) chemical flocculation; 5) filtering with quartz sand; and 6) biologically reinforced treatment with pyrosulfite-tolerant engineering bacteria. According to the invention, weak acidity of the organic pyrosulfite wastewater is made full use of, the strong oxidation effect of a Fenton reagent under the condition of weak acidity is given to play so as to oxidize pyrosulfite with toxicity into nontoxic sulfate, and macro-molecular organic matters in the wastewater can be degraded small molecules, so biodegradability of the wastewater is improved; and the domesticated engineering bacteria with salinity tolerance of 50 g / L are used as bacteria in a biologically reinforced treatment phase for three-stage biologically reinforced treatment so as to microfloras adaptive to environment, so degradation of the wastewater is efficiently realized under cooperation of the microfloras and effluent totally meets primary standards prescribed in Comprehensive Wastewater Discharge Standard in China.

An aqueous staining reagent is described, a composition of a stain, a metal metabisulfite, and acid in water. The stain can be a cationic stain and is preferably thionin. The metal metabisulfite is preferably sodium metabisulfite. A method of preparing the aqueous staining reagent is described. Cytological methods for imaging cells stained by the aqueous staining reagent are described. A kit for cellular analysis is described.

The invention relates to a method for removing films and deposits from stainless surfaces, especially from stainless metallic surfaces such as they are used in process stations and production units in the pharmaceutical, food and biotechnological industries, and to an aqueous cleaning solution comprising a reducing agent, in particular dithionite and / or disulfite, and at least two different complexing agents, wherein one of these complexing agents is a compound comprising diacetic acid groups or a salt thereof, for removing rouging on surfaces of stainless steels that come into contact with media selected from the group of chromium / nickel and chromium / nickel / molybdenum steels in the neutral pH range.

The invention discloses a method for synthesizing pyridinium hydroxy propyl sulfobetaine. The method comprises the following steps of: dissolving pyrosulfite or bisulfite of alkali metal into water, and performing a ring-opening addition reaction of the obtained solution and epichlorohydrin to obtain a ring-opening product with the following chemical formula in the presence of sulfite and a phase transfer catalyst, wherein M is alkali metal in the formula; and dissolving the ring-opening product into water, reacting the obtained solution and pyridine, and purifying to obtain the pyridinium hydroxy propyl sulfobetaine (PPS-OH) after the reaction is finished. By the method for synthesizing the PPS-OH, the yield is high, byproducts are avoided, a product does not contain free pyridine, and the electroplating effect is better. Meanwhile, the method is pollution-free, and is more favorable for environmental protection because water is taken as a solvent. Moreover, the catalyst is added, so that catalytic reaction effect is better, reaction speed is higher, conditions are easier to control, and the method is applicable to industrialized production. The aeration of inert gas into the reaction can also reduce the polymerization of free radicals of the epichlorohydrin caused by the existence of oxygen, so that the yield is further improved.

The invention provides application of lead or copper ion test paper in detection of bleaching toner residue. The lead or copper ion test paper is selected from qualitative filter paper with diameter of 1.5 to 2.5 centimeters, and comprises lead acetate test paper, copper acetate test paper or copper sulfate test paper. The bleaching toner capable of being detected by using the lead or copper ion test paper comprises one or more of sulfur dioxide, sulfite, bisulfite, low sulfite, pyrosulfite and sodium formaldehyde sulfoxylate. The lead or copper ion test paper can also be used for preparing a kit for detecting the bleaching toner residue. The invention also provides a specific method of applying the lead or copper ion test paper in the detection of the bleaching toner residue. The kit has the advantages of simple operation, quick detection, low cost, semi-quantitative measurement and high accuracy, other detection instruments for auxiliary detection are not needed, and detection environments and conditions are not limited. Uniform color is formed in 5 to 10 minutes, and semi-quantitative detection can be performed.

The invention relates to an ultrahigh-temperature drilling fluid filtrate reducer and its preparation method, especially relates to an ultrahigh-temperature brine drilling fluid high-temperature high-pressure filtrate reducer and its preparation method, and belongs to the technical field of synthesis of water-soluble polymer materials. The filtrate reducer is obtained through a reaction of sulfomethylated phenolic resin, formaldehyde, hydroxyalkyl aldehyde, alicyclic ketone or aliphatic ketone, sulfite and pyrosulfite at a high temperature under a high pressure for a certain time. The filtrate reducer can effectively control the high temperature and high pressure filtration loss and the rheological property of the brine drilling fluid, has good compatibility with LP527, MP488 and SMC, has good high temperature stability, has no thickening phenomenon after ageing at 220DEG C, can effectively control the high temperature and high pressure filtration loss of the drilling fluid less than 16 ml, and still has good rheological property under a density of 2.32 g / cm<3>. The preparation process is easy to control, and the above obtained product can satisfy the need of the control of the high temperature and high pressure filtration loss of the 220DEG C ultrahigh-temperature drilling fluid.

The invention discloses a multifunctional pad and a processing method thereof. The pad is composed of multiple capillary tubes adhering together, and the two ends of each capillary tube are communicated with the outside. A coating can be arranged on the inner wall of each capillary tube, is made of titanium dioxide, silicon dioxide, essence, perfume, kieselguhr, activated carbon, pyrosulfurous acid and pyrosulfite or pypocholoride and is 0.1-300 micrometer thick. The capillary tubes can be arrayed vertically and horizontally, and parts of outer walls of the capillary tubes adhere together. The processing method of the pad includes the following steps that the outer wall of each capillary tube is coated with adhesive, and the pad is obtained through extrusion and curing forming. The multifunctional pad has the functions of ventilating, absorbing water, buffering, fresh keeping and specific gas releasing and can be applied to all the fields of home life, product package, air freshening and fruit and vegetable preservation, the processing method is simple, and the raw materials are easy to obtain.

The invention discloses a thiosulfate silvering plating solution and an electroplating method. The thiosulfate silvering plating solution includes: 40-50g / L silver nitrate, 230-250g / L thiosulfate, 45-65g / L carbonate, 40-50g / L of pyrosulfite, 2-3g / L citrazinic acid, 0.3-0.5g / L thiosemicarbazide and 0.1-0.2g / L triethanolamine. According to the technical scheme of the invention, thiosemicarbazide is selected as the anode activator, the citrazinic acid, thiosemicarbazide and triethanolamine are compounded to serve as the brightener, the plating solution can have good stability, and the coating has strong color change resistance and weldability.

The invention discloses a method for preparing myricetin by using vine tea and an application of pyrosulfite. The method comprises the following steps of: extracting the ground vine tea with hot water, filtering while the vine tea is hot, concentrating the filter liquor and cooling to separate out sediments; carrying out suction filtration, dissolving the sediment residue with absolute ethyl alcohol, filtering to remove undissolved substances, and concentrating the ethanol solution obtained from filtration to obtain ethyl alcohol extract; adding the ethyl alcohol extract into the pyrosulfite solution for reaction, then pouring the reaction liquid into an ice-water mixture, and crystallizing, filtering, washing and drying to obtain the myricetin. According to the application, the pyrosulfite is applied to the vine tea as a dehydrogenation oxidizing agent for dehydrogenation transformation from dihydromyricetin to myricetin, and the transformation efficiency is high. By using the method, materials are low in cost and can be easily obtained. The method is simple, pollution-free and low in equipment requirement and can be widely applied to industrial production. The yield of the prepared myricetin reaches 21% in comparison with materials, and the purity reaches 96%.

The invention relates to transportation type preservative paper for red grapes, which is characterized in that ceraceous materials are used as hydrophobic materials, and a mixture of pyrosulfite and organic acid is diffused in the ceraceous materials (the weight proportion of pyrosulfite and organic acid to the ceraceous materials is 10:90 to 90:10) to form an active material layer capable of slowly releasing SO2. Hot pressing is carried out on the active material layer by non-woven fabrics and breathable film to form the preservative paper. The release period of the preservative paper in the low and damp transportation process of red grapes can reach four or five days, and the residue amount of SO2 in the preserved red grapes is smaller than 10 ppm.

The present invention provides a gold-plating solution which can not be substituted by nickel. When the matrix for plating chemical nickel is not powdered with direct current, the matrix can not be substituted in the gold-plating solution to form layer with poor adhesive force, so that it can raise boding force of gold-plated layer on the matrix. Said invention water base gold-plating solution contains potassium dicyanoaurate, EDTA salt, pyrophosphite and thiourea. The use condition of gold-plating solution includes: temp. of plating solution is 55-60 deg.C, pH value is 7.5-10, current intensity is 0.04-0.5 A / sq.dm, and its power supply can be D.C. power supply or pulse square-wave power supply.

The invention discloses a high-reduction modified aliphatic water reducing agent and a preparation method thereof. The water reducing agent is prepared from the following raw materials in parts by weight: pyrosulfite, ketone compound, aldehyde compound, dispersant, active agent, liquid alkali and water. The preparation method comprises the following steps of: adding the water, the pyrosulfite, the liquid alkali and the dispersant into a reaction container, heating, adding the ketone compound at the temperature of between 30 and 50 DEG C, and stirring; dripping a solution of the aldehyde compound for 1 to 3 hours, and controlling the dripping speed; and finally adding the active agent, heating to the temperature of between 80 and 100 DEG C, and performing polymerization reaction for 2 to 4 hours. The cheap pyrosulfite is used for replacing expensive sulfite, and a part of other cheap raw materials are used for the synthetic reaction, so the cost of the water reducing agent is effectively reduced; and by using the active agent containing a long side chain, the stereo-hindrance effect is improved, and the synthesized water reducing agent has a high water reducing effect and is high in adaptability.

The present invention discloses a refining process for removing chlorate from perchlorate. According to the content of chlorate in the perchlorate the stoichiometric metasulfite solution or solid can be added, and reacted with chlorate to decompose the chlorate into the compound which can be easily dissolved in water. The perchlorate in the product does not produce reaction with said compound, and the small quantity of acid produced by reaction can be neutralized by alkali to make pH value of solution be 7-9, the content of chlorate in the perchlorate can be controlled in below 0.003% (by chloride) so as to reach to the index of high-quality product.

The invention relates to a grape fresh powder and a preparation method thereof, wherein the grape fresh powder comprises insecticides and heat-seal package papers, the insecticides are quantificationally heat-sealed in a medicine package which is made from package papers, and comprise pyrosulfite, controlled-release agents and filling agents, the heat-seal package papers are perforated through a laser perforating machine, holes are similar elliptical holes, the areas of the holes are 2-12*10-3mm2, and the density of the holes is 2-5 / cm2. The grape fresh powder and the preparation method thereof are simple in process, high in production efficiency, steady and controlled in quality, and the slow release period of sulfur dioxide is 3-5 months.

A process for producing molybdenum compounds, from spent molybdenum catalyzers, industrial residues and metal alloys, particularly an integrated process for reclaiming molybdenum, vanadium, nickel, cobalt, aluminum and other metals, starting with the treatment of exhausted catalyzers, industrial residues and metal alloys, principally from petroleum de-sulfurization catalyzers; the molybdenum trioxide is obtained by precipitation of ammonium octamolybdate and its calcination. Starting from molybdenum trioxide, other compounds derived from molybdenum can be obtained, as sodium molybdate, molybdenum disulfite and ammonium molybdate.

The invention discloses dried mangos and a method for manufacturing the same. The method includes 1), peeling mangos, removing mango stone and slicing the mangos to obtain mango slices; 2), carrying out color protecting processing on the mango slices in pyrosulfite solution to obtain color-protected mango slices; 3), carrying out sugaring processing on the color-protected mango slices to obtain sugared mango slices; 4), draining the sugared mango slices to obtain drained mango slices; 5), carrying out vacuumizing processing on the drained mango slices to obtain vacuumized mango slices; 6), mixing the vacuumized mango slices, sugar solution and malt syrup with one another to obtain mixtures, and frying the mixtures by the aid of charcoal to obtain charcoal-fried mango slices; 7), drying one surface of each charcoal-fried mango slice at the temperature of 60-66 DEG C for 80-100 min, turning the charcoal-fried mango slices over, drying the other surface of each charcoal-dried mango slice at the temperature of 55-60 DEG C for 100-140 min, and drying the charcoal-fried mango slices by the aid of cold wind at the temperature of 50-55 DEG C until the moisture contents of the mango slices account for 15-18% of the weights of the mango slices; 8), softening the dried mango slices and mixing the mango slices with powdered sugar to obtain the dried mangos. Requirements on vacuum degrees of -0.8--0.7 Mpa and processing time of 1-3 min are met when vacuumizing processing is carried out on the drained mango slices. The dried mangos and the method have the advantage that the dried mangos have excellent taste, shape and colors.

The composition containing liposoluble licorice extractive for external use can suppress discoloration and stinking-up of the liposoluble licorice extractive, prevent the effective component in the liposoluble licorice extractive from decomposing and suppress gas generation accompanying the decomposing of pyrosulfite and / or sulfite, and has greatly raised stability. It contains liposoluble licorice extractive, at least one of pyrosulfite and sulfite and at least one selected from glycyrrhizic acid, glycyrrhizinate, glycyrrhitic acid and its derivative, and has pH value regulated to 4.5-7.5.

The invention relates to a preparation method of 2,6-dimethyl-6-alkyloxy(or hydroxyl)heptaldehyde, comprising the following steps: Step 1, placing 2,6-dimethyl-2-alkyloxy(or hydroxyl)-7-octene, a solvent and water in a reactor, blowing a O3 / O2 mixture into the reactor, layering products after the reaction, and blowing a protective gas into an oil phase for protection; Step 2, adding a bisulfite or pyrosulfite solution into the oil phase obtained from the Step 1, heating, neutralizing products obtained after the reaction by the use of an alkaline solution, separating to obtain oil and water phases, washing the oil phase to neutral, and separating to obtain oil and water phases. The oil phase obtained is a crude product 2,6-dimethyl-6-alkyloxy(or hydroxyl)heptaldehyde. The preparation method provided by the invention has advantages of simple process, high conversion rate of raw materials, high product yield, low follow-up separation difficulty, good industrial reliability, is environmentally friendly, and is suitable for industrial production.

The invention provides a one-step method for preparing grafted polyolefin wax. The one-step method comprises the following steps: grafting a graft comonomer onto a polyolefin wax main chain according to a solid phase graft technology to obtain comonomer grafted polyolefin wax; feeding a resolvent to the comonomer grafted polyolefin wax to resolve unreacted unsaturated polar monomers and dimethyl benzene, removing the resolvent, feeding an emulsifier, pyrosulfite, water and alkali, stirring for mixing, and ensuring the temperature to be any temperature or in any temperature range of 160 DEG C to 180 DEG C for heat-insulating reaction to obtain a grafted polyolefin wax emulsion. The method has the advantages that the consumption of harm resolvent dimethyl benzene, operation time and cost are greatly reduced; compared with those in a common grafted product, free maleic anhydride and dimethyl benzene in the grafted polyolefin wax prepared according to the method are removed more easily and completely.

The invention belongs to the field of organic synthesis, and specifically discloses a method for coupling a nitroaromatic compound and a boric acid compound to synthesize a sulfonamide compound. The method for coupling the nitroaromatic compound and the boric acid compound to synthesize the sulfonamide compound comprises the steps that in an organic solvent, pyrosulfite is used as a source of SO2,and heating is carried out for a coupling reaction, and then after the post-treatment, the sulfonamide compound is obtained. The method for coupling the nitroaromatic compound and the boric acid compound to synthesize the sulfonamide compound is simple in operation, does not require nitrogen protection, and can be carried out under air. The nitroaromatic compound and the boric acid compound are abundant in source, relatively low in price, high in reaction yield, wide in applicability of a substrate and free in metal residual. The method for coupling the nitroaromatic compound and the boric acid compound to synthesize the sulfonamide compound can be used for synthesizing a series of sulfonamide compounds, and the synthesized compounds have wide application value in the fields of pesticidesand medicines.