171results about How to "High whiteness" patented technology

The invention belongs to the technical field of ultra-high molecular weight material manufacturing, and particularly relates to an ultra-high molecular weight polyethylene fiber recycling spinning method which comprises the following five steps: S1, sorting; s2, dehydrating and degumming; s3, cutting is conducted; s4, dissolving; and S5, spinning. According to the method, the ultra-high molecular weight polyethylene fiber with the physical property equal to that of the protofilament can be recycled, the ultra-high molecular weight polyethylene fiber with the use performance higher than that of the protofilament can be obtained, and the application range of the recycled ultra-high molecular weight polyethylene fiber is effectively widened; the purposes of efficient and environment-friendly regeneration and high-quality recycling of the waste ultra-high molecular weight polyethylene fibers are achieved.

The present invention discloses an engineered Trichoderma reesei for producing lipase, and a construction method and application thereof, and belongs to the fields of molecular biology and biotechnology. The engineered Trichoderma reesei heterologously expresses a lipase having an amino acid sequence as shown in SEQ ID NO.1; in the engineered Trichoderma reesei, the genes of the original cellulases cbh1 and cbh2 and xylanases xyn1 and xyn2 in Trichoderma reesei are replaced in sequence with genes encoding the lipase; the nucleotide sequence of the gene encoding the lipase is shown in SEQ ID NO.2. The present invention successfully constructs an engineered Trichoderma reesei strain that secretes and expresses lipase. The engineered strain can be used for the production of food-grade lipase, and the produced lipase meets food safety standards, and can significantly improve the specific volume and whiteness of baked goods (such as bread), which will be more suitable for actual food industry needs.

The invention belongs to the technical field of solid waste resource utilization, and relates to a method and system for preparing vaterite type calcium carbonate from waste incineration fly ash. The method comprises the following steps: by taking ammonium chloride as a leaching agent, leaching the waste incineration fly ash in a leaching agent solution, and then carrying out solid-liquid separation to obtain a calcium solution; and carrying out carbonation reaction on the calcium solution, an alkaline compound, sodium dodecyl benzene sulfonate and carbon dioxide under the conditions that the pressure intensity is 0.5-0.7 MPa and the temperature is 25-180 DEG C for 60-90 minutes to obtain the calcium carbonate. According to the method, high-quality vaterite type calcium carbonate can be prepared at a high conversion rate, the risk of fly ash is reduced, and mineralization of carbon dioxide is realized, so that waste is treated by waste, and green production is realized.

The invention belongs to the technical field of resin polymerization additives, and particularly relates to an antioxidant type suspended emulsion terminator for PVC (polyvinyl chloride) and a preparation method thereof, the antioxidant type suspended emulsion terminator comprises the following raw material components in parts by mass: 5-30 parts of phenolic antioxidant; 5 to 20 parts of a thioester antioxidant; 0.1-5 parts of an ultraviolet light absorber; 0.1 to 5 parts of a chain terminator; 1-10 parts of a heat stabilizer; 0.1 to 7 parts of a stabilizer; 0.1 to 5 parts of an emulsifier; 0.1-5 parts of a wetting dispersant; according to the invention, through the combination of the selected main and auxiliary antioxidants and the combination of the ultraviolet light absorber and the heat stabilizer, the defect structure of PVC is improved at the end of PVC polymerization, and meanwhile, the combination of the main and auxiliary antioxidants can quickly decompose peroxide and hydroperoxide at the later stage of processing; compared with the prior art, the whiteness and thermal stability of PVC in the early stage are good, the anti-yellowing effect and the long-term aging resistance of PVC in the later processing are more emphasized, the performance of PVC in the dynamic thermal stability is improved, and the volume impedance and the initial coloring are low.

The invention relates to a polybutylene terephthalate resin composition as well as a preparation method and application thereof. The polybutylene terephthalate resin composition comprises bio-based polybutylene terephthalate resin, a titanium element, a phosphorus element and a cobalt element, the weight content of a titanium element in the polybutylene terephthalate resin composition is 20 to 150 ppm, the weight content of a phosphorus element is 2 to 50 ppm, and the weight content of a cobalt element is 4 to 100 ppm; the mass ratio of the titanium element to the phosphorus element to the cobalt element in the polybutylene terephthalate resin composition is (2-20): (1-2): (1-10). According to the polybutylene terephthalate resin composition provided by the invention, the weight content and the mass ratio of the titanium element, the phosphorus element and the cobalt element are controlled in a proper range, so that the polybutylene terephthalate resin composition has high whiteness, excellent mechanical property and ageing resistance.

The invention relates to the technical field of antioxidant auxiliaries, and particularly discloses a powerful anti-yellowing composition as well as a preparation method and application thereof. The invention relates to a powerful anti-yellowing composition, which comprises the following components in parts by weight: 25 parts of hindered phenol antioxidant; 20 to 30 parts of a diphosphorus phosphite ester antioxidant; 20-30 parts of an ultraviolet weight absorbent; 15-25 parts of a hindered amine light stabilizer; and 4-6 parts of a light screening agent. The preparation method of the powerful anti-yellowing composition comprises the following steps: blending the components of the powerful anti-yellowing composition, heating until the components are molten after mixing, uniformly mixing, and cooling to obtain the powerful anti-yellowing composition. According to the powerful anti-yellowing composition, the specific antioxidant, the ultraviolet light absorber, the light stabilizer and the light screener are compounded, so that the powerful anti-yellowing composition has better anti-yellowing performance, can be prepared by blending in polyether, improves the anti-yellowing effect of underwear cotton, does not need to be added in batches for many times during use, and is convenient to use.

The invention provides a PC reflecting material, application of the PC reflecting material in preparation of a PC reflecting film and the PC reflecting film, and relates to the technical field of PC reflecting materials, application of the PC reflecting material in preparation of the PC reflecting film and the PC reflecting film, the PC reflecting material comprises the following components: first PC particles, reflecting master batch, transparent polyester resin and a foaming aid; wherein the reflective master batch comprises the following components: second PC particles, crystalline polyester resin, titanium dioxide and an optional antioxidant. According to the PC reflecting material provided by the invention, the PC particles are used as a matrix, and the reflecting master batch, the transparent polyester resin and the foaming aid capable of improving the reflecting effect of the material are added, so that the temperature resistance, the reflectivity and the dimensional stability of the reflecting material are improved.

The efficient raw material cleaning equipment for improving the whiteness of the white cement clinker comprises a bottom plate, a supporting assembly is arranged on the top face of the bottom plate, a sleeve is arranged on the top face of the supporting assembly, a flushing assembly is connected to one side of the sleeve, and a water circulation assembly is connected to the side, away from the sleeve, of the flushing assembly; the second waste pool is arranged at the bottom of the water circulation assembly, one side of the water circulation assembly is in through connection with the interior of the sleeve, a rolling washing assembly is inserted into the sleeve, one side of the flushing assembly is inserted into the rolling washing assembly, and a rolling pushing assembly is slidably connected to the top face of the supporting assembly and is attached to the outer wall of one side of the rolling washing assembly in a rolling mode. White cement raw materials are put into the rolling washing assembly to be washed, the rolling pushing assembly is driven to horizontally move on the track plate, the rolling washing assembly can conveniently drive the cleaned white cement raw materials to be pulled out of and inserted into the sleeve, and therefore the cleaning efficiency of the white cement raw materials is improved.

The invention provides a preparation method of multi-size patterned white bamboos, which comprises the following steps: selecting mature bamboos with intact appearance, cutting the bamboos into required sizes, and polishing off a wax coat on the surface and a thin film in the bamboos; then carrying out drying treatment at the temperature of 80 to 110 DEG C, wherein the drying time is 24 to 72 hours; putting the bamboo wood into an alkaline solution, soaking for 10-20 minutes at normal temperature, taking out and airing, and coating the surface of the bamboo wood with a bleaching solution; the bamboo wood is placed under a light source for illumination, and photocatalytic oxidation is conducted till the whole color or the local color of the bamboo wood becomes white; and then the bamboo wood is placed in an organic solvent, after ultrasonic cleaning is conducted for 5-10 min, natural drying is conducted, and the white bamboo wood is obtained. The preparation method of the multi-size patterned white bamboo wood is simple in process and not limited by the size of raw materials, the overall white bamboo wood can be prepared, the local patterned white bamboo wood can also be prepared, the structural integrity of the bamboo wood can be kept while high whiteness (larger than or equal to 90%) is achieved, and the prepared white bamboo wood is high in mechanical strength.

The invention discloses a composite decolorizing agent for high-iron aluminosilicate glass and an application method thereof.The composite decolorizing agent comprises a glass mixture of the high-iron aluminosilicate glass and the composite decolorizing agent added into the glass mixture, the composite decolorizing agent is composed of CeO2, Co2O3 and Nd2O3, the content of CeO2 accounts for 0.05%-0.15% of the glass mixture, the content of Co2O3 accounts for 1.5 ppm-2. 5ppm of the glass mixture, the content of Nd2O3 accounts for 1.5 ppm-2. 5ppm of the glass mixture, and the content of Nd2O3 accounts for 1.5 ppm-2. 5ppm of the glass mixture. The content of the Nd2O3 is 0.01%-0.02% of the content of the glass mixture. According to the present invention, the low-cost common white sand is adopted to introduce the SiO2, and the CeO2, the Co2O3 and the Nd2O3 are added to remove the bad color in the neutralized glass, such that the whiteness of the glass can be effectively improved, the control on the color of the alumina silicate glass can be achieved under the high iron content, the stable decolorization effect is provided, and the production cost is reduced.

The invention relates to the technical field of calcium carbonate manufacturing, in particular to a preparation method of high-whiteness light calcium carbonate. Comprising the following steps: efficiently leaching the calcium element in the carbide slag; preparing a microbial crystal form control agent; and carrying out electric dispersion treatment and precipitation on calcium ions. The microbial crystal form control agent is prepared by regulating and controlling the mixing ratio of the bacillus pumilus fermentation liquor to the pseudomonas fluorescens fermentation liquor, and it is avoided that in the full mixing process of the microbial crystal form control agent and the calcium-containing filtrate, Ca < 2 + > is mineralized to form large calcium carbonate particles; stearic acid and sodium polyacrylate in the microbial crystal form control agent can enable particles to be more stable, provide ion adsorption capacity, optimize the crystal form of calcium carbonate and form vaterite type crystals with smaller crystal form, and bacillus pumilus can assist generation of small-particle-size calcium carbonate along with time, so that high-whiteness small-particle-size light calcium carbonate is obtained.

The invention discloses an efficient and energy-saving continuous open-width bleaching and washing process for knitted fabric. The process comprises the steps of fabric preparation, an efficient bleaching stage, bleaching treatment, a continuous open-width washing stage and drying treatment. The low-alkali bleaching finishing agent has the beneficial effects that low-alkali bleaching finishing of the fabric is realized, the output of heavy sewage is reduced, and the fabric has the advantages of good whiteness and strength, so that the problems that the energy utilization efficiency is low, and energy is wasted in each link from bleaching to washing to drying are solved.

The present invention proposes a non-woven fabric soft and fluffy treatment agent and a preparation method thereof, and belongs to the technical field of non-woven fabrics. The surface of nano silicon dioxide is modified with aminosilane and then subjected to hyperbranching reaction with dimethylol propionic acid, further modified with a silane coupling agent, reacted with the reaction product of vegetable oil and diethylenetriamine, and then mixed with glycerol, water, Tween-80, and aminosilicone oil, and emulsified to obtain a non-woven fabric soft and fluffy treatment agent. The non-woven fabric soft and fluffy treatment agent prepared by the present invention has good hydrophilicity and fluffiness, and is green and environmentally friendly, improves the whiteness of the product, avoids yellowing of the fabric and phenol yellowing, and can improve the mechanical properties of the product to a certain extent, improve the skin-friendly feel and smoothness of the fabric, and has broad application prospects.

The present disclosure relates to a lyocell material with controlled whiteness by hydrogen peroxide treatment and a manufacturing method thereof, wherein the lyocell material has improved whiteness due to an aging effect through drying and packaging by a predetermined amount of hydrogen peroxide remaining in a tow, and may replace a CA cigarette filter to lower environmental pollution problems caused by discarded cigarette butts, and thus the lyocell material is suitable as a cigarette filter.

The invention belongs to the technical field of fine chemicals, and discloses a black talc whitening composite powder and a preparation method thereof. The method of the present invention comprises the following steps: the raw black talc ore is crushed and dry-ground to obtain black talc powder; the black talc powder is mixed with water, formulated into a powder slurry, and constant temperature wet grinding is carried out after mixing with a grinding aid and a dispersant to obtain a black talc slurry; the black talc slurry is mixed and ground with titanium dioxide slurry and a flocculant, and liquid phase mechanochemical coating is carried out to obtain a core-shell composite slurry; the core-shell composite slurry is flash dried, depolymerized and broken up to obtain a black talc whitening composite powder. The above method of the present invention significantly improves the whiteness of black talc, expands the application field of black talc, can be whitened without high energy consumption, improves the resource utilization rate of black talc, and meets the requirements of energy conservation and environmental protection.

The invention relates to a preparation method of a titanium dioxide pigment with low surface hardness, which comprises the following steps: producing a titanium dioxide primary product by adopting a chlorination process, pulping in de-ionized water, preparing into slurry, adding a water-soluble silicate solution as a dispersing agent, curing, and grinding. The slurry is heated, and the whole coating process is carried out at the temperature. The surface of titanium dioxide is coated with a layer of loose magnesium silicate at a certain pH value by adopting water-soluble magnesium salt and silicate, so that the surface hardness of titanium dioxide is reduced while the product has high dry covering and excellent weather resistance on blocking photochemical active points on the surface of titanium dioxide, thereby reducing the abrasion to related products and processing equipment. The titanium dioxide pigment prepared by the method not only has high dry covering power, but also has low surface hardness, and is particularly suitable for being applied to the fields of ink-jet ink and chemical fiber products.

The invention provides a method for rapidly extracting light-color phenolated lignin, and belongs to the field of biomass refining. The method comprises the following steps: uniformly mixing a lignocellulose raw material with a mixed solution of aromatic sulfonic acid and a phenolic compound according to a certain solid-to-liquid ratio, and carrying out ultrasonic treatment at a certain temperature; and after the treatment is completed, carrying out solid-liquid separation, pouring the obtained extracting solution into water to precipitate lignin, and washing and drying to obtain the light-color phenolated lignin. The method disclosed by the invention is simple in process, low in time consumption and high in yield, and the solvent is easy to recycle; the prepared lignin is extremely light in color and high in phenolic hydroxyl group content, retains most of aryl ether bonds, can adjust the content of phenolic hydroxyl groups and methoxyl groups in the lignin to a certain extent, and solves the problems of dark color, few functional groups and low reaction activity of the existing industrial lignin. The method can be used for producing lignin-based functional products without further color reduction and activation treatment.

The application provides a continuous production method and system of calcium hydroxide with high whiteness and high specific surface area, and relates to the technical field of limestone deep processing. The continuous production method comprises the following steps: step one: continuously adding quicklime particles into the inlet of a primary digester, continuously adding digestion water and an additive into the inlet of the primary digester, and carrying out premixing and pre-digestion under stirring conditions; step two: continuously introducing the discharge of the primary digester into a secondary digester, continuously adding digestion water and an additive into the inlet of the secondary digester, and stirring and digesting and aging; step three: the discharge of the secondary digester is sequentially introduced into a tertiary digester, a quaternary digester and a quinary digester for digestion and aging, and the product is obtained after grading by a grader. The method can continuously prepare calcium hydroxide with high whiteness and high specific surface area, and has the characteristics of simple process, short time consumption, remarkable effect and low energy consumption, and has been applied in actual production and has good use effect.

The utility model relates to the field of papermaking, and discloses a raw material processing device for improving paper whiteness, which comprises a supporting base and a stirring tank, a supporting column is fixedly connected on the supporting base, a supporting top plate is fixedly connected at the upper end of the supporting column, a rotating mechanism for driving the stirring tank to rotate is arranged on the supporting base, and an adjusting sleeve is arranged on the supporting top plate. The lower end of the supporting top plate is provided with a through hole matched with the adjusting sleeve, the lower end of the supporting top plate is fixedly connected with a vertical plate, one side of the vertical plate is rotationally connected with a rotating disc, and the rotating disc is rotationally connected with an eccentric shaft; a second motor for driving the turntable to rotate is fixedly connected to the vertical plate, and the eccentric shaft is rotationally connected to one side of the control box. Compared with the prior art, the stirring device has the advantages that the stirring efficiency and the stirring quality are greatly improved, paper pulp and filler are mixed more sufficiently, and the whiteness of paper is further improved.

The invention discloses a cotton fabric crease-resistant finishing method for constructing a simulated semi-interpenetrating polymerization network based on in-situ polymerization, isopentenol polyoxyethylene ether macromonomer copolymerization is introduced in the method, and on the basis of in-situ polymerization, maleic anhydride and acrylic acid are used for jointly realizing the crease-resistant finishing effect of polycarboxylic acid; by means of the structural characteristics of the isopentenol polyoxyethylene ether macromonomer, an imitated semi-interpenetrating polymerization network structure is constructed in the cotton fabric, and anti-wrinkle finishing of the cotton fabric is achieved. Under the optimal process conditions, the optimal anti-wrinkle finishing effect is obtained, the wrinkle recovery angle WRA is 252.2 degrees, and the whiteness is 73.6. The obtained wrinkle recovery angle WAR of the original cloth sample is 141.5 degrees, and the whiteness is 80.7. The wrinkle recovery angle is obviously increased, the anti-wrinkle effect is obvious, the whiteness maintaining effect is good, and yellowing is small. The method is easy to operate, raw materials are easy to obtain, enterprise cost can be saved, and environmental protection and industrial production are facilitated.

The invention discloses a PC (polycarbonate) composition and a preparation method and application thereof, and belongs to the technical field of high polymer materials, magnesium oxide and silicon dioxide with specific size and whiteness are introduced into PC matrix resin to serve as a light-transmitting agent, so that the prepared product does not generate a yellowing effect, has ideal whiteness, and is high in light transmittance. And meanwhile, high light transmittance and high infrared light transmittance can be realized.

The invention relates to the technical field of organic synthesis, and provides a method for preparing o-sulfonyl chloride / amine methyl benzoate by using o-chloromethyl benzoate. The preparation method comprises the following steps: 1, mixing methyl o-chlorobenzoate and pure water, stirring, adding sodium thiosulfate, and heating for reaction to obtain a solution; the preparation method comprises the following steps: adding dichloroethane and pure water into a reaction kettle, stirring, cooling, introducing chlorine, dropwise adding a solution, controlling the dropwise adding time and the temperature of the reaction kettle, carrying out a heat preservation reaction, removing chlorine, and drying to obtain o-sulfonyl chloride methyl benzoate; and 2, on the basis of the prepared o-sulfonyl chloride methyl benzoate, adding the o-sulfonyl chloride methyl benzoate into methanol while stirring, cooling, adding an ammonia solution, heating for reaction to generate a crude o-sulfonamide methyl benzoate product, and adding an adsorbent for purification to obtain the o-sulfonamide methyl benzoate. The preparation method disclosed by the invention is relatively low in production cost, less in waste gas and waste water and capable of realizing coordinated development of economic benefits and environmental benefits, and the o-sulfonyl chloride / methyl aminobenzoate is high in purity.

The invention relates to the technical field of wet-process phosphoric acid, and particularly discloses a method for preparing semi-hydrated gypsum by desulfurization and acid return, which comprises the following steps: S1, adding phosphorite into intermediate acid in the production process of semi-hydrated wet-process phosphoric acid for desulfurization treatment to obtain desulfurized slurry, cooling the slurry, and aging to obtain bottom ore pulp and top overflow desulfurized phosphoric acid; and S2, part of the desulfurized phosphoric acid obtained in the S1 returns to a semi-hydrated wet-process phosphoric acid reaction tank to fully react with phosphorite, then excessive sulfuric acid is added for reaction, and finally solid-liquid separation is performed to obtain semi-hydrated intermediate acid and semi-hydrated gypsum. According to the method disclosed by the invention, the desulfurized intermediate acid is used for decomposing the phosphate ore, so that the phenomenon of phosphate ore passivation easily caused by too high concentration of liquid-phase sulfate radicals in the semi-hydrated process is reduced, the phosphate ore acidolysis is more complete, the decomposition efficiency is higher, and the yield of phosphorus can be improved.

The invention provides a refining method of 3, 3 ', 4, 4'-biphenyltetracarboxylic acid, which comprises the following steps: mixing a 3, 3 ', 4, 4'-biphenyltetracarboxylic acid crude product, acetic acid, a ketone solvent and water at 90-100 DEG C to obtain a biphenyltetracarboxylic acid crude product solution; and mixing the crude biphenyltetracarboxylic acid solution with the seed crystal at 80-90 DEG C, and then carrying out cooling crystallization to obtain a 3, 3 ', 4, 4'-biphenyltetracarboxylic acid refined product. The invention provides a refining method of 3, 3 ', 4, 4'-biphenyltetracarboxylic acid, which has the following advantages: (1) the total metal ions of the product are low and the purity is high, acetic acid is used as an ion exchanger in the refining method, the metal ion removal effect and the product purity can be effectively improved, and the total metal ions can be reduced to 0.2 ppm or below; (2) the yield and the whiteness of the product are high, and the whiteness can be increased to 98% or above; and (3) the refining method is simple and convenient in process.

The invention relates to the field of fluorescent whitening, and discloses a fluorescent whitening composition and a preparation method and application thereof, the fluorescent whitening composition comprises the following components by weight: 30-45 parts of an acrylate emulsion, 5-12 parts of a fluorescent whitening agent, 1-5 parts of a modified additive, and 10-25 parts of deionized water; the fluorescent whitening agent is an aminated nano titanium dioxide grafted modified fluorescent parent, and the modified fluorescent parent is prepared by carrying out a first-step nucleophilic substitution reaction on cyanuric chloride and p-aminobenzene sulfonic acid and then carrying out a second-step nucleophilic substitution reaction on the obtained product and a fluorescent parent 4, 4-diaminostilbene-2, 2-disulfonic acid; according to the invention, the fluorescent whitening agent and the modified additive are added, so that the whiteness of the paper can be improved, the effect of inhibiting the yellowing of the paper is obvious, and the paper is not prone to yellowing. And the tensile strength, the tearability, the water resistance and the aging resistance of the paper can be effectively improved.

The invention relates to a full-particle-size flotation process method for improving the recovery rate of lepidolite through fine silt pretreatment. The full-particle-size flotation process method comprises the following steps that crushed lepidolite raw ore is subjected to ore grinding operation; conveying the ore grinding product to a first hydrocyclone; feeding an underflow product of the first hydrocyclone into a five-lamination high-frequency vibrating screen, returning an oversize product to a ball mill for regrinding, and removing iron from an undersize product; feeding the non-magnetic material subjected to iron removal into a spreading chute; carrying out shaking table roughing and re-selection on the distributed ore concentrate; feeding the cloth sliding tailings and the shaking table roughing and checking tailings into a first-section cyclone; overflow of the first-section cyclone is fed into a first deep-cone thickener; the deep cone underflow is added into a fine silt pretreatment tank, a dispersing agent is added into the fine silt pretreatment tank, uniform stirring and pretreatment are performed, and pretreated fine silt is obtained; and the first-section cyclone underflow and pretreated fine silt mixed ore pulp is added into a flotation stirring barrel, a matched collecting agent is added, and flotation operation is carried out. The method can improve the recovery rate of lepidolite, synchronously improve the whiteness of feldspar and the like.

This invention discloses a hydrophilic organosilicon finishing agent and its preparation method, belonging to the field of textile auxiliaries technology. The finishing agent is prepared by compounding polyurethane-modified silicone oil and amide-modified polyether silicone oil at a mass ratio of 1:1~2, followed by emulsification with an emulsifier. The polyurethane-modified silicone oil is obtained by polymerizing a blocked polyurethane prepolymer with terminal epoxy polyether silicone oil and block silicone oil; the amide-modified polyether silicone oil is obtained by amidation reaction of terminal epoxy polyether silicone oil and polyether amine in the presence of organic acid. This invention, through the synergistic effect of the two-component compound, provides skeletal support and elastic recovery through polyurethane segments and a hydrophilic surface layer through amide groups, effectively solving the problem of balancing hand feel and hydrophilicity in nylon-spandex fabrics. The finished fabric hand feel rating can reach level 4 or higher, water droplet diffusion time can be as low as 0.9s, the emulsion has good stability, and it is not prone to oil drift, significantly superior to similar products on the market.

The utility model relates to the technical field of ammonium sulfate treatment, in particular to a production device and a production system of desulfurized ammonium sulfate. The utility model discloses a desulfurized ammonium sulfate production device and system. The desulfurized ammonium sulfate production device comprises a desulfurization tower, the desulfurization tower is connected to a ground tank, a discharge port of the ground tank is connected to a filter press and the desulfurization tower, and a liquid outlet of the filter press is connected to the ground tank; and a discharge port of the filter press desulfurization tower is connected to the cyclone. According to the production device and the production system for desulfurized ammonium sulfate, through the oxidation tank and the filter press, the dust removal pressure of the cloth dust remover is relieved, coal ash in slurry is removed, and the whiteness of ammonium sulfate is improved.

The invention belongs to the technical field of high polymer material synthesis, and particularly relates to a low-temperature continuous preparation device and method for high-temperature-resistant nylon, and the method mainly comprises the following steps: a neutralization salt forming stage, a first-stage tubular reactor stage, a second-stage tubular reactor stage and a third-stage tubular reactor stage, therefore, continuous feeding of raw materials such as binary acid and diamine and continuous output of high-temperature-resistant nylon products are realized. The device and the method are suitable for preparing homopolymerized and copolymerized high-temperature-resistant nylon, such as semi-aromatic nylon, alicyclic nylon and nylon containing naphthalene rings, are wide in application range, low in polymerization temperature, short in polymerization time, stable in composition, good in product quality, low in yellow index, high in whiteness and stable in performance, realize backflow of diamine and recovery of materials, and are suitable for industrial production. Generation and emission of three wastes are reduced, and the production cost is reduced.

The invention relates to the field of D21H21 / 30, and in particular to a stable acid-resistant brightener and a preparation process thereof. The preparation raw materials at least include cyanuric chloride, a sulfonic acid compound, an amine compound and an amino acid. Glycine and glutamic acid are added by design to carry out a condensation reaction, and a liquid fluorescent brightener containing an asymmetric structure is obtained after the reaction, thereby greatly improving the storage stability of the liquid fluorescent brightener. Meanwhile, the liquid fluorescent brightener with a symmetrical structure and the liquid fluorescent brightener with an asymmetric structure generated after the reaction have a composite whitening effect, and the optical behaviors generated by the liquid fluorescent brighteners of different components do not interfere with each other, thereby greatly improving the whitening effect of the stable acid-resistant brightener, solving the problem that the surface of the obtained paper is dark and the whiteness is not high in the process of applying the fluorescent brightener to papermaking, and ensuring the whiteness, water solubility and anti-cation interference ability of the product.