136 results about "Alkali hydroxide" patented technology

The present disclosure relates to a method for processing of liquefied waste plastics (LWP). The method includes subjecting a liquefied waste plastic-based feedstock to heat treatment (HT processing) in an aqueous solution containing alkali metal hydroxide and / or alkaline earth metal hydroxide to form a heat treated effluent, transferring the heat treated effluent to a separator, subjecting the heat treated effluent to phase separation to isolate at least an oil phase including treated LWP and an aqueous phase including contaminated material, and recycling at least a part of the aqueous phase back to the HT processing.

The application discloses a Mo-Ni bimetallic denitration catalyst and a preparation method thereof, and relates to the technical field of denitration agents, and the preparation method comprises the following steps: firstly, a nickel source, a molybdenum source and an aluminum source are smelted and crushed to obtain a Ni-Mo-Al ternary alloy powder; then, the Ni-Mo-Al ternary alloy powder is added into a mixed alkaline leaching solution containing alkali metal hydroxide, a surfactant and hydrophobic conductive micro powder to perform a dealuminization reaction; hydrogen bubbles generated in-situ by the reaction are used as soft templates, and the hydrophobic conductive micro powder is adsorbed on the bubble interface and assembled in the skeleton through Pickering effect; finally, the catalyst is obtained through washing and drying; the catalyst prepared by the application has a large pore structure with conductive micro powder distributed on the inner wall; the unique structure not only reduces the mass transfer resistance, constructs an electron transmission channel, but also promotes the discharge of product nitrogen through a local hydrophobic environment, and significantly improves the catalytic activity and nitrogen selectivity when treating nitrate-containing wastewater.

The application relates to the field of photocatalytic materials, and discloses a preparation method and application of a Ge-doped ZnSn(OH)6 photocatalyst. The Ge-doped ZnSn(OH)6 photocatalyst is prepared by using SnCl4.5H2O, Zn(Ac)2.2H2O, alkali metal hydroxide, methyl cellulose and GeO2 as raw materials through a hydrothermal synthesis method. The crystalline powder can be obtained without high-temperature sintering, the catalyst can generate a large amount of electrons and hydroxyl radicals, has excellent degradation effect on volatile organic compounds such as methylbenzene, can realize 100% removal effect on 50ppm concentration methylbenzene within 10 minutes, has excellent deep mineralization capacity, and has great potential for pollution prevention and treatment of atmospheric environment.

The invention discloses a preparation method of hexa-naphthyloxy cyclotriphosphazene, which comprises the following steps: adding alkali metal hydroxide into a reaction solvent in which naphthol is dissolved, and reacting at 40-60 DEG C for 20-40 minutes to prevent oxygenolysis so as to prepare an alkali metal naphthol salt solution; the solution is stirred and dropwise added into a reaction solvent containing hexachlorocyclotriphosphazene, the ratio of hexachlorocyclotriphosphazene to the solvent is 1: 20-1: 30, the ratio of naphthol to hexachlorocyclotriphosphazene is larger than or equal to 6: 1, substitution is carried out step by step, after dropwise adding is completed, a reaction is carried out for 12-24 h at the temperature of 80-120 DEG C, and six chlorine atoms are completely substituted by naphthyloxy; filtering reaction liquid, and washing a filter cake with a solvent; and carrying out reduced pressure distillation on the filtrate to recover the solvent, washing the crude product with ethanol to remove an intermediate and an oligomer, washing with water to remove water-soluble impurities, filtering, and drying to finally obtain the high-purity hexa-naphthyloxy cyclotriphosphazene with the melting point of 169 DEG C. According to the method, the high-purity hexa-naphthyloxy cyclotriphosphazene crystal is ensured to be obtained by accurately controlling substitution reaction conditions and a multi-stage purification process.

The invention discloses a zinc dicarboxylate catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalyst synthesis. The zinc dicarboxylate catalyst provided by the invention is prepared according to the following method: further reacting an intermediate obtained by reacting dicarboxylic acid with alkali metal hydroxide with zinc salt at constant temperature and low temperature, mixing the obtained mixture with ethanol, filtering, and washing a filter cake to obtain the high-activity zinc dicarboxylate catalyst. The zinc dicarboxylate catalyst with a more regular crystal form is obtained by accurately controlling the temperature and the pH value of a reaction mixture, the catalyst is a large-crystal-cluster rectangular flaky crystal, and the crystal cluster length of the catalyst is obviously larger than that of an existing zinc dicarboxylate catalyst. Meanwhile, the crystal thickness is obviously lower than that of the existing dicarboxylic acid catalyst. The zinc dicarboxylate catalyst disclosed by the invention shows very high catalytic activity in the process of catalyzing a CO2-epoxide copolymerization reaction.

The invention discloses a Mo-Ni bimetallic denitration catalyst and a preparation method thereof, and relates to the technical field of denitration agents, the preparation method comprises the following steps: firstly, smelting and crushing a nickel source, a molybdenum source and an aluminum source to obtain Ni-Mo-Al ternary alloy powder; then adding into a mixed alkaline leaching solution containing alkali metal hydroxide, a surfactant and hydrophobic conductive micro powder to carry out dealumination reaction; hydrogen bubbles generated in situ in a reaction are used as a soft template, and hydrophobic conductive micro powder is adsorbed on a bubble interface and assembled in a skeleton through a Pickering effect; and finally washing and drying to obtain the catalyst. The prepared catalyst has a macroporous structure with conductive micro powder distributed on the inner wall, the unique structure not only reduces mass transfer resistance and constructs an electron transport channel, but also promotes discharge of a product nitrogen through a local hydrophobic environment, and the catalytic activity and nitrogen selectivity during treatment of nitrate-containing wastewater are remarkably improved.

This invention relates to the field of selective hydrogenation technology, specifically to a selective hydrogenation catalyst for alkynes and dienes, its preparation method, and its application. The catalyst provided by this invention uses a modified composite oxide as a support, on which active components are loaded; wherein the modified composite oxide uses a composite oxide as a support, on which alkali metal hydroxides are loaded; the composite oxide includes alumina and zirconium oxide; the active components include nickel, iron, lead, and selenium. The catalyst provided by this invention not only possesses high reactivity and high selectivity, but also avoids excessive hydrogenation to form alkanes, while inhibiting or preventing olefin isomerization to form other isomers. Furthermore, it exhibits high stability, a long single-pass life, and does not require frequent regeneration.

The application discloses a preparation method of aluminum dialkyl hypophosphite with different alkyl groups, and comprises the following steps: (1) dispersing aluminum hypophosphite solid in a low concentration in a solvent system containing alkali metal hydroxide and water, the mass ratio of the aluminum hypophosphite solid to water being 1:20-1000; under the initiation of a free radical initiator, making olefin 1 and the aluminum hypophosphite solid to have an addition reaction at 100-150 DEG C and 0.1-0.3 MPa, and controlling the consumption of the olefin 1 to be sufficient for the reaction of the aluminum hypophosphite solid, so as to prepare an aluminum monoalkyl hypophosphite solution, filtering the precipitate, and collecting the filtrate; (2) continuously feeding olefin 2 different from the olefin 1 into the filtrate, and making the aluminum monoalkyl hypophosphite and the olefin 2 to have an addition reaction under the initiation of the free radical initiator at 100-150 DEG C and 0.1-0.3 MPa, so as to obtain aluminum dialkyl hypophosphite with different alkyl groups. The purity of the aluminum dialkyl hypophosphite with different alkyl groups prepared by the application is above 99.5%.

This invention discloses an inorganic laminated fireproof board and its preparation method. The fireproof board comprises: an intumescent fire-retardant impregnating material, a heat insulation material layer, and a flame-retardant fiber layer. The flame-retardant fiber layer is located on both sides of the heat insulation material layer. The intumescent fire-retardant impregnating material is used to impregnate the flame-retardant fiber, and the layers are bonded together by the intumescent fire-retardant impregnating material. The intumescent fire-retardant impregnating material is prepared from the following components by weight: 9-20 parts of alkali metal hydroxide, 20-35 parts of silicon dioxide, 1-10 parts of fluorosilicone powder, and 50-150 parts of deionized water. The manufacturing steps of the fireproof board include: (1) preparing the intumescent fire-retardant impregnating material; (2) impregnation; (3) bonding; and (4) drying. The fireproof board prepared by this invention has high fire resistance, does not burn, and does not generate toxic or harmful fumes when exposed to fire. It has excellent fire resistance and environmental protection performance and is an excellent substitute for existing fireproof boards.

A novel process for making steam cracker feedstocks from contaminated pyrolysis oil, e.g., derived from waste plastics. The process utilizes an alkali hydroxide hydrolysis to clean the pyrolysis oil. The clean pyrolysis oil is then sent to an isocracking section to prepare high quality steam cracker feedstock. Some products can be sent to a steam cracker as feedstocks, while others can be recycled back into the system to improve feedstock yield. This recycling can also be done for better heat management.

The invention relates to the technical field of ammonium oligomeric phosphate fertilizers, and discloses a method for regulating and controlling polymerization distribution of oligomeric APP and an ammonium oligomeric phosphate fertilizer, the method is characterized in that a blocking agent is added in the process of preparing the oligomeric APP through a urea condensation method, the blocking agent is a dilute solution of alkali metal hydroxide, and the addition amount of the blocking agent is 6-20% of the use amount of a condensing agent. In the process of preparing ammonium polyphosphate through urea condensation, the blocking agent is added to terminate the polymerization reaction, so that the polymerization distribution of the product can be controlled. The blocking agent is added in the reaction process, so that the reaction temperature can be increased, the dosage of the condensing agent can be increased, target polymerization distribution can be quickly achieved, the reaction time is greatly shortened, and the efficiency is improved. On the basis of the regulation and control method provided by the invention, the ammonium oligomeric phosphate fertilizer prepared by the urea condensation method is distributed towards oligomers (n is equal to 2-3 and the content is high), the highest polymerization degree is not higher than 9, and the ammonium oligomeric phosphate fertilizer is high in water solubility, fast in hydrolysis and high in chelating capacity.

The invention concerns dry particulate compositions for forming a geopolymer, comprising an aluminosilicate containing mineral, a polymeric additive, an alkali metal silicate, and an alkali metal hydroxide. The invention concerns processes of making geopolymers, the geopolymers, as well as the use of the dry particulate compositions in the formation of geopolymers.

The present application belongs to the technical field of wastewater treatment, and relates to treatment of oil-containing wastewater in a transformer accident oil pool in a transformer substation, in particular to a method for simultaneously adsorbing transformer oil and heavy metals in a transformer accident oil pool. A magnesium-aluminum hydrotalcite calcination oxide is added to oil-containing wastewater in the accident oil pool as an adsorbent for treatment; the magnesium-aluminum hydrotalcite calcination oxide is prepared by single titration of a mixed solution of magnesium salt and aluminum salt with an alkali solution containing alkali metal hydroxide and alkali metal carbonate to form magnesium-aluminum hydrotalcite-like, and then the magnesium-aluminum hydrotalcite-like is calcined to obtain the magnesium-aluminum hydrotalcite calcination oxide. The method provided by the present application can not only greatly reduce the COD of oil-containing wastewater in the transformer accident oil pool, but also effectively adsorb various heavy metal ions such as iron, chromium, arsenic and selenium at the same time, so as to realize treatment of the oil-containing wastewater in the transformer accident oil pool.

Disclosed herein is a process for making an (oxy)hydroxide of TM where TM refers to metals of which at least 97 mol-% are transition metals and where TM includes manganese and nickel, and where at least 50 mol-% of TM are manganese, the process including the steps of:(a) providing at least one aqueous solution (α) of water-soluble salts of such metals and an aqueous solution (β) including alkali metal hydroxide selected from the group consisting of NaOH and KOH,(b) combining solutions (α) and (β) at a pH value in the range of from 9.5 to 10.3, where such step (b) is carried out using at least one coaxial mixer including two coaxially orientated pipes through which an aqueous solution (β) and an aqueous solution of (α) are introduced into a stirred vessel, thereby precipitating an (oxy)hydroxide of TM, and(c) recovering and drying the (oxy)hydroxide of TM.

The present invention relates to a method of making lithium hydroxide from lithium salts by reacting a lithium salt with an alkali metal hydroxide in an aqueous solution in the presence of ammonia.

The presently disclosed and / or claimed inventive concept(s) relates to a method for preparing a reaction product, comprising (1) molten mixing a first active hydrogen containing component and a first alkali hydroxide to form a first mixture; (2) adding water into the first mixture to dissolve the first molten alkali hydroxide to form a second mixture; (3) reacting a first hydrophobic component with the second mixture to provide a Diluent; (4) molten mixing at least one second active hydrogen containing component, a second alkali hydroxide and the Diluent to form a third mixture; (5) adding water into the third mixture to dissolve the second molten alkali hydroxide to form a fourth mixture; and (6) reacting the fourth mixture with a gem-polyhalide compound or a sulfonate ester for a sufficient time to form the reaction product. Also, disclosed is a water soluble or dispersible composition comprising a diluent and a polymer.

The invention discloses a preparation method of high-solid-content colloidal silicon dioxide and a product. According to the method, active silicic acid is used as a raw material, a seed growth method is adopted, a compound stabilizer composed of alkali metal hydroxide and organic alkali is introduced in the growth process, and a gradient heating curing process is matched. The colloidal silicon dioxide with the solid content up to 50-60wt%, excellent stability and narrow particle size distribution is successfully prepared by regulating and controlling the particle structure and uniformity through the synergistic stabilization effect of the compound stabilizer and the gradient temperature. The method is mild in process condition, low in raw material cost and suitable for industrial production and application.

The present invention provides a cleaning agent composition that has a sufficient cleaning effect against dirt caused by the adhesion of oils and greases, in particular a cleaning agent composition that can exhibit a sufficient cleaning effect even when oils and greases are firmly adhered or when a large amount of oils and greases are adhered, a method for producing the same, and a cleaning method using the cleaning agent composition. [Solution] The present invention relates to a detergent composition containing an anionic surfactant and an alkali metal silicate and / or alkali metal hydroxide, wherein the mass ratio of alkali metal silicate and / or alkali metal hydroxide to the anionic surfactant in the detergent composition ([alkali metal silicate and / or alkali metal hydroxide] / anionic surfactant) is 0.08 to 12, and the sum of the content of the anionic surfactant and the content of alkali metal silicate and / or alkali metal hydroxide in the detergent composition is 65% by mass or more, a detergent composition, a method for producing the same, and a cleaning method using the detergent composition.

This invention, entitled "A Sample Pretreatment Solution, Pretreatment Method, and Application for Vitamin B12 Detection," belongs to the field of analytical detection technology. The technical problem to be solved is how to simultaneously improve the accuracy and safety of vitamin B12 detection. The key technical solution is a sample pretreatment solution for vitamin B12 detection, comprising: 10 g / L–30 g / L of alkali metal hydroxide, 0.005 g / L–0.05 g / L of cyanide, and 0.5 g / L–1.5 g / L of disodium ethylenediaminetetraacetate (EDTA). By adding disodium EDTA, the alkali metal hydroxide, cyanide, and disodium EDTA work synergistically to effectively reduce the concentration of highly toxic cyanide, which requires strict safety management, thereby simultaneously improving the overall accuracy and operational safety of vitamin B12 detection.

The present invention relates to a binder in the form of a mineralized plant-based aqueous biopolymer comprising: a) between 1% (w / w) and 90% (w / w) of a polysaccharide selected from starch and flour; b) between 1% (w / w) and 25% (w / w) of an alkali metal hydroxide, an alkaline earth metal hydroxide or a trivalent, tetravalent or pentavalent cationic metal hydroxide; c) between 5% (w / w) and 70% (w / w) of silicic acid or a salt thereof (silicate); d) between 1% (w / w) and 40% (w / w) of a silicon source or a further metal source; and between 0.1% (w / w) and 15% (w / w) of sodium hexametaphosphate.

The invention relates to the technical field of preparation of chemical treatment agents for oil and gas drilling, and discloses a temperature-resistant and salt-resistant polymeric cellulose filtrate reducer and a preparation method thereof. The method comprises three stages of base catalytic activation, gradient etherification modification and controllable free radical graft polymerization which are performed in sequence. The preparation method comprises the following steps: activating and swelling microcrystalline cellulose in a ternary alkali metal hydroxide mixed alcohol-water solution in an inert atmosphere; sequentially etherifying to obtain a zwitterionic cellulose ether intermediate; and finally, in a lithium chloride / dimethyl sulfoxide complex solvent system, carrying out ultrasonic treatment assisted atom transfer radical graft copolymerization, and combining precipitation, washing, supercritical carbon dioxide drying and low-temperature crushing to obtain the product. The whole preparation process can be continuously completed, and the product has excellent temperature resistance and salt resistance and is suitable for filtrate loss reduction treatment of drilling fluid under complex oil and gas drilling working conditions.

This invention provides a highly productive manufacturing method that allows for the production of benzenesulfonyl compounds in extremely high yields, even through a simple process. [Solution] The present invention relates to a method for producing benzenesulfonyl compounds in the presence of a phase-transfer catalyst and an aqueous alkali metal hydroxide solution, and is capable of producing benzenesulfonyl compounds in high yield even under mild reaction conditions with excellent reaction rate.

Provided are: an ion exchange membrane which has small variation in current efficiency, and with which it is possible to produce an aqueous alkali hydroxide solution that has excellent caustic quality; an alkali chloride electrolysis apparatus which comprises the ion exchange membrane; and a method for producing an alkali hydroxide.　The ion exchange membrane comprises a layer (S) that contains a fluorine-containing polymer having a sulfonic acid-type functional group and a layer (C) that contains a fluorine-containing polymer having a carboxylic acid-type functional group, wherein: a woven fabric is disposed in the layer S; the woven fabric is configured from yarns A that extend in one direction and yarns B that extend in a direction substantially orthogonal to the yarns A; and the amount of displacement of the ion exchange membrane is 10-20 mm when a pulling operation is performed for 10 minutes, the pulling operation repeatedly performing an operation 1 for pulling the ion exchange membrane for 1 second at a pulling load of 10 N and an operation 2 for pulling the ion exchange membrane for 0.1 second at a pulling load of 0.1 N in a direction that is at an angle of 45 degrees to the direction in which the yarns A extend in the plane of the ion exchange membrane.

This invention discloses a composition for removing camphor ball odor from clothing, its preparation method, and its application method. The composition comprises the following components in parts by weight: 4-15 parts polyol, 2-8 parts fatty alcohol polyoxyethylene ether sulfate, 3-9 parts fatty acid, and 0.5-2 parts sodium hydroxide or potassium hydroxide. This invention utilizes the products of the reaction between polyol, fatty alcohol polyoxyethylene ether sulfate, fatty acid, and alkali metal hydroxide to increase the solubility of dichlorobenzene, which then reacts with naphthol in camphor balls, thereby removing dichlorobenzene and naphthol from clothing due to the camphor ball odor. The composition for removing camphor ball odor from clothing of different materials can effectively remove camphor ball odor from clothing, and the removal method is simple.

The application relates to the field of high polymer chemistry, in particular to a preparation method of 4-hydroxybenzophenone glycidyl ether. The application obtains a mixture of a product and raw materials through different reaction temperatures and reaction times under different raw material ratios, recovers the raw materials first, removes excessive alkali metal hydroxide through water washing and neutralization, and finally removes the solvent through negative pressure distillation to obtain the product.

The invention relates to the technical field of melamine, and discloses an energy-saving clean joint production method and system for melamine and high-quality soda ash, the production method comprises the following steps: using urea as a raw material to produce melamine, and collecting a byproduct melamine tail gas; the method comprises the following steps: reacting melamine tail gas with alkali liquor in a reactor to form solid-containing slurry and residual gas; sequentially carrying out flash evaporation and solid-liquid separation on the solid-containing slurry, and drying and cooling the obtained solid to obtain a sodium carbonate product; the alkali liquor is an aqueous solution of alkali metal hydroxide and / or alkaline earth metal hydroxide; the reaction temperature ranges from 100 DEG C to 250 DEG C, and the reaction pressure ranges from 0.6 MPa to 10.0 MPa. According to the invention, urea is used as a raw material to produce melamine and obtain melamine tail gas, then the characteristic that carbon dioxide and ammonia in the melamine tail gas have different solubility in a caustic soda solution is utilized to realize thorough separation of ammonia and carbon dioxide, and the carbon dioxide and caustic soda generate sodium carbonate.

Two-part low density, electrically and thermally insulating epoxy adhesive compositions include Part A) a curative part with at least one curing agent that is a primary polyamine, Part B) an epoxy part with at least one epoxy resin, and additives in Part A, Part B, or both. The additive components are glass bubbles, at least alkaline metal hydroxide salt having melting temperature no higher than 450℃ selected from aluminum hydroxide or a blend of aluminum hydroxide with other metal hydroxides, and at least one intumescent polyphosphate reagent. The composition upon mixing of Part A with Part B cures at room temperature, and upon curing forms a cured composition that has high temperature stability such that upon exposure to 450℃ for 5 minutes the cured composition does not disintegrate.

The invention discloses a method for preparing organic acid through biomass pyrolysis catalyzed by cobalt oxide, which comprises the following steps: pyrolyzing a first mixture containing a biomass raw material, cobalt oxide and alkali metal hydroxide in an oxygen-free atmosphere to obtain a solid-phase organic acid salt mixture; dissolving the solid-phase organic acid salt mixture with water, and carrying out solid-liquid separation to obtain filtrate A and filter residues B; mixing the filtrate A with ethanol, and carrying out solid-liquid separation to obtain filter residues C and filtrate B; and dissolving the filter residue C with water, acidifying and extracting to obtain first organic acid and raffinate. The method for preparing the organic acid by catalyzing biomass pyrolysis through the cobalt oxide provides an efficient, green and sustainable biomass conversion path, high-selectivity synthesis of the organic acid is achieved through a cobalt oxide catalysis system, and the method has the multiple advantages of being simple and convenient in process, mild in condition, high in resource utilization rate, capable of achieving environment positive benefits and the like; the method has important industrial application prospect and ecological value.

To provide a method for producing polyarylene sulfide (PAS) resin and a method for measuring the concentration of sulfur compounds using a measurement method that can measure the concentration of sulfur compounds with high accuracy in a short time. [Solution] A method for producing PAS resin, comprising reacting a polyhalo-aromatic compound with (i) an alkali metal sulfide, or (ii) an alkali metal hydroxide and an alkali metal hydroxide in an organic polar solvent, the method comprising measuring the concentration of the alkali metal sulfide or the alkali metal hydroxide by near-infrared spectroscopy, and adjusting the raw material ratio or polymerization reaction conditions based on the concentration.