31results about How to "Reduce insoluble content" patented technology

The invention belongs to the technical field of fertilizers, and in particular relates to a lignin slow-release water-soluble fertilizer and a preparation method thereof. The lignin slow-release water-soluble fertilizer is prepared by adding a strong activating agent into an organic straw liquid, lignin, lignin-degrading enzyme; when the lignin is solid lignin, the weight parts of the organic straw liquid, the solid lignin and the lignin-degrading enzyme are 60-90 parts of the organic straw liquid, 10-40 parts of the solid lignin and 1-3 parts of the lignin-degrading enzyme; when the lignin is liquid lignin, the weight parts are 10-30 parts of the organic straw liquid, 70-100 parts of the liquid lignin and 1-3 parts of the lignin-degrading enzyme. The lignin slow-release water-soluble fertilizer provided by the invention has a slow-release function and water-soluble fertilizer properties as well, environmental pollution caused by comprehensive utilization of biomass raw materials is reduced, problems that a conventional slow-release water-soluble fertilizer is high in production cost, incomplete in nutrient component, relatively poor in fertility and the like can be solved, and modern organic planting of integral water and fertilizers can be achieved.

The invention relates to a method for preparing low-iron polyaluminium sulfate by using an aluminiferous waste sulfuric acid mother liquor. The method includes the following steps: adding aluminiferous waste sulfuric acid mother liquid into a pretreatment reactor, adding a heavy metal capturing agent, and conducting filter pressing separation to obtain a reaction liquid I; mixing and reacting industrial sulfuric acid and calcium aluminate powder according to a certain proportion to obtain a reaction solution II; conducting an alkalization polymerization on the reaction liquid I and reaction liquid II under a certain temperature, adding a stabilizer, then continuing the polymerization reaction, conducting filter pressing separation and cooling to obtain a liquid low-iron polyaluminium sulfate product. The invention has the beneficial effects of easily available raw materials, simple process operation, safe and environment-friendly production, high production efficiency, extremely low content of insoluble matters in the product, extremely low iron content in the product, high added value, application to fine paper manufacturing, special requirements for water treatment, production of high-grade titanium dioxide and application as a high filler.

The invention discloses a temperature-resistant salt-resistant quick-dissolving thickening agent used for a seawater-based fracturing fluid and a preparation method thereof. The temperature-resistant salt-resistant quick-dissolving thickening agent comprises the following components in percentages by mass: 6% to 8% of acrylic acid, 5% to 6% of sodium hydroxide, 18% to 23% of acrylamide, 1% to 2% of an isolation monomer, 3% to 4% of a functional anion monomer, 3% to 5% of a functional cationic monomer, 4% to 6% of an association intermediate, and 0.4% to 0.8% of an ammonium persulfate-sodium bisulfite redox system or 0.6% to 1.0% of azobisisobutyronitrile which is used as an initiator, with the balance being deionized water. The preparation method for the temperature-resistant salt-resistant quick-dissolving thickening agent comprises the following steps: 1, synthesis of the association intermediate; 2, synthesis of a thickener colloid; and 3, colloid postprocessing. The thickening agent provided by the invention has the following advantages: salt resistance is excellent; the degree of mineralization of a solution has little influence on the rate of swelling; the viscosity-increasing capacity in seawater is strong; antibacterial stability of the solution is strong; the solution has excellent temperature resistance and shearing resistance; and the content of an insoluble substance is extremely small and can not be measured with a conventional method, so the damage of residues on reservoir strata is almost eliminated.

The invention provides a purification method of lithium difluorophosphate, and the purification method comprises the following steps: S1: in an inert gas protective atmosphere, dissolving a lithium difluorophosphate crude product by using an organic solvent, removing water by using a molecular sieve, and filtering by using a precision filter to obtain a lithium difluorophosphate solution of whichthe water content is less than 5ppm and the insoluble substance content is less than 200ppm; S2, adding a deacidifying agent into the lithium difluorophosphate solution obtained in the step S1 to obtain a lithium difluorophosphate solution of which the acid value(based on HF)is lower than 10ppm; S3, recrystallizing the lithium difluorophosphate solution obtained in the step S2 to obtain lithium difluorophosphate solid particles of which the impurity metal ion content is lower than 1ppm; and S4, drying and crushing the lithium difluorophosphate obtained in the step S3 to obtain a lithium difluorophosphate particle product with extremely low contents of water, free acids, insoluble substances and metal ions. The method can effectively remove water, acids and metal impurities of lithium difluorophosphate with poor quality, reduce the content of insoluble substances and improve the product quality of the lithium difluorophosphate.

This invention relates to an improved method for preparing solid sodium aluminate. The method comprises: (1) reacting gibbsite and liquid base to obtain a coarse solution; (2) purifying to obtain a refined solution; (3) spray-drying to obtain the final product. The product has such advantages as high quality and high adaptability of raw materials, and is suitable for mass production.

The invention discloses a solid-liquid separation type two-step reaction system for production of polyaluminum chloride. The two-step reaction system comprises a conditioning tank, a conditioning tank transfer tank, a cooling tower, a separating tank, a separated slag storing tank, a flocculating agent preparing pot and a semi-finished product tank, wherein the conditioning tank is provided with a calcium aluminate feeding inlet and a first-step liquid feeding inlet; the conditioning tank is communicated with the conditioning tank transfer tank; the outlet of the cooling tower is communicated with the separating tank; the flocculating agent preparing pot is communicated with the separating tank; the upper part of the separating tank is communicated with the semi-finished product tank; and the lower part of the semi-finished product tank is communicated with the separated slag storing tank. The two-step reaction system is characterized by further comprising a cyclone separator arranged between the conditioning tank transfer tank and the cooling tower; the conditioning tank transfer tank is connected with the liquid inlet of the cyclone separator via a conditioning liquid delivery pump; and the overflow liquid outlet of the cyclone separator is connected with the liquid inlet of the cooling tower. The system reduces the content of insoluble substances in the manner of solid-liquid separation so as to improve the output and quality of a polyaluminum chloride product.

The invention relates to a Gleditsia sinensis polysaccharide gum and a preparation method thereof. The preparation method of the Gleditsia sinensis polysaccharide gum comprises the following steps: preprocessing the Gleditsia sinensis seed with sulfuric acid, then shelling, drying, chipping, selecting, screening, hydrating, and grinding. The method prepares the polysaccharide gum by steps of preprocessing the Gleditsia sinensis with sulfuric acid, and separating by washing with water, chipping, and so on, the ratio of galactose to mannose in product is changed while the content of water insoluble matter in product is lowered, so that the polysaccharide gum has better gel property after being blended with xanthan gum.

The invention discloses a preparation method of liquid dye for active ink.The preparation method comprises the following steps that firstly, dye synthetic raw stock fully stands, insoluble substances are separated out, and then filtering is conducted to obtain filter liquid; secondly, inorganic salt is added into the filter liquid obtained in the first step, filtering is conducted to obtain a filter cake, then, water is added into the filter cake, and pulping is conducted to obtain pulped liquid; thirdly, the membrane treatment technology is adopted to conduct desalination and concentration on the pulped liquid obtained in the second step, and a concentrated solution is obtained; fourthly, cosolvent, buffer salt and bactericide are added into the concentrated solution obtained in the third step, and the liquid dye for the active ink is obtained.Viscosity modifier and tension modifier can be added into the liquid dye so that the active ink can be prepared, and the prepared active ink for inkjet printing is good in stability and printing effect.

The invention relates to a method for preparing low-iron polyaluminium sulfate by using an aluminiferous waste sulfuric acid mother liquor. The method includes the following steps: adding aluminiferous waste sulfuric acid mother liquid into a pretreatment reactor, adding a heavy metal capturing agent, and conducting filter pressing separation to obtain a reaction liquid I; mixing and reacting industrial sulfuric acid and calcium aluminate powder according to a certain proportion to obtain a reaction solution II; conducting an alkalization polymerization on the reaction liquid I and reaction liquid II under a certain temperature, adding a stabilizer, then continuing the polymerization reaction, conducting filter pressing separation and cooling to obtain a liquid low-iron polyaluminium sulfate product. The invention has the beneficial effects of easily available raw materials, simple process operation, safe and environment-friendly production, high production efficiency, extremely low content of insoluble matters in the product, extremely low iron content in the product, high added value, application to fine paper manufacturing, special requirements for water treatment, production of high-grade titanium dioxide and application as a high filler.

The invention discloses a method for preparing sodium fluoride from defluorination residue generated in production of phosphoric acid by a wet process. The method comprises the following steps of respectively recycling mother liquid, sodium carbonate and defluorination residue slurry, reacting and crystallizing the defluorination residue slurry and a sodium carbonate solution and simultaneously returning fine sodium fluoride particles to the system for secondary growth. By larger sinking speed difference between sodium fluoride and silicon dioxide, the separation of sodium fluoride from silicon dioxide is achieved, and the technical problem of difficulty in separation of sodium fluoride from SiO2 is effectively solved. The sodium fluoride product obtained by the method is coarse, more than 85% of the sodium fluoride product has particle diameter greater than 0.35mm and the yield of fluorine in the sodium fluoride product is above 85%. By the method, the circulation of the mother liquid is achieved, the water consumption as well as the production cost are decreased, and the method has good social and economic values and is suitable for being popularized and applied.

The invention relates to a secondary mixing method of an epoxy resin composition for semiconductor encapsulation. The present invention is to prepare epoxy resin, phenolic resin curing agent, inorganic filler, release agent, low stress modifier, coloring agent, flame retardant, silane coupling agent and Put the inorganic ion scavenger into a high-speed mixer, after stirring evenly, melt and knead at a temperature of 70-100°C, press into tablets after kneading, cool, and pulverize into powder; then mix the obtained powder with a solidification accelerator in a high-speed mixer After stirring evenly in the medium, carry out secondary melting and kneading at a temperature of 70-100° C., after kneading, tablet, cool, and pulverize to obtain an epoxy resin composition for semiconductor encapsulation. The invention adopts the secondary mixing method to obtain the epoxy resin composition for semiconductor encapsulation with good fluidity, low insoluble matter content, excellent encapsulation moldability, reduced leak seal ratio and improved mold opening hardness.

The invention provides a preparation method and application of licorice extract, and relates to the technical field of extraction of effective components. Comprising the following steps: (1) raw material pretreatment: crushing a dried licorice raw material, adding an organic solvent and a surfactant, soaking, filtering, and reserving filter residues for later use; (2) extraction: performing water extraction on the filter residues obtained in the step (1), then filtering, discarding the filter residues, and retaining filtrate; and (3) concentrating the filtrate obtained in the step (2) into paste, and then drying to obtain the licorice extract. In the pretreatment step, licorice powder is soaked in an organic solvent and surfactant soaking mode, the solubility of ineffective components with different dissolving properties in the organic solvent is increased, and then the content of effective components in licorice extract is increased; and the content of insoluble substances in water and the total gray level of the obtained extract are obviously reduced.

This invention relates to an improved method for preparing solid sodium aluminate. The method comprises: (1) reacting gibbsite and liquid base to obtain a coarse solution; (2) purifying to obtain a refined solution; (3) spray-drying to obtain the final product. The product has such advantages as high quality and high adaptability of raw materials, and is suitable for mass production.

The invention discloses a high-temperature-resistant full-suspension low-injury fracturing fluid, which comprises the following components in weight percent: 0.3-0.5% of a low-injury thickener, 0.1-0.4% of a multi-functional stabilizer, and 0.1-0.3% of a regulator , suspension synergist 0.4-0.8%, the rest is clear water or salt water; the preparation method of fracturing fluid is: Step 1, add low-damage thickener, multi-functional stabilizer and regulator into clear water or salt water under stirring conditions, Stir evenly and swell for 2 to 4 hours to obtain the fracturing fluid base fluid; step 2, fully mix the fracturing fluid base fluid and the suspension synergist, and form sand-carrying performance and Full-suspension fracturing fluid with excellent thermal performance. The fracturing fluid of the present invention is a super-strength structural fluid formed by physical cross-linking and chemical cross-linking of acrylamide polymers and suspension synergists, with a temperature resistance of up to 150°C; excellent sand-carrying performance, The spatial structure can fully suspend the proppant and is less affected by temperature.

The invention relates to the field of marine lubricating oil, and discloses an engine oil reinforcer which comprises 0.5-5 wt% of dialkyl secondary amine, 0.5-10 wt% of alkylamine, 0.5-10 wt% of alkyl hydramine, 5-10 wt% of antiwear additive and 65-93.5 wt% of base oil. When being used in marine medium-speed engine oil, the reinforcer can obviously lower the insoluble impurities in old oil, can disperse the carbon deposits, oil sludge and other solid matters, can lower the in-use oleic acid value to prevent rust, and is capable of reinforcing the alkali number of old oil, effectively prolonging the service time of in-use oil and saving the oil cost, thereby bringing in great economic benefits.

The invention discloses a preparation method of Daxueteng granules. The preparation method includes the steps of material preparation, precooking, pulverization, homogenization, spray drying and granulation. The preparation method of the invention forms a complete set of granulation process, and obtains The content of insoluble matter in the Daxueteng granules is low, and it is convenient to take, which overcomes the shortcomings of the traditional production technology of Daxueteng granules.