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 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 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 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 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 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 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.

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 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.