6547 results about "Strong acids" patented technology

A process for the production of steviosides from Stevia rebaudiana Bertoni includes extraction of comminuted plant material by directly injecting steam into the extractor followed by filtration to get aqueous extract and alkali treatment to remove unwanted compounds in the form of precipitate. The treated aqueous extracted was filtered and the filtrate was first treated with gel or macroporous strong acid cation exchange resin and then with gel or macroporous weak base anion exchange resin. The aqueous eluant containing steviosides was concentrated to obtain purified steviosides.

The invention discloses a preparation method for aluminum oxide by a direct forming method. The method is characterized in that the aluminum oxide is directly formed by a wet filter cake, wherein pore volume is 0.3-0.8ml/g; a specific surface area is 150-300 m<2>/g; and crushing strength is 30-120 N/particle; the preparation process comprises the steps: a) meta-aluminate containing aluminum or a strong acid salt compound is neutralized with a precipitator solution at a temperature of 30-80 DEG C and pH of 6-9; accessory ingredient is added in a neutralizing process; mixture is aged for at least 10min after neutralizing; b) prepared aluminium hydroxide gel is washed by de-ionized water for 4-10 times; dosage of the de-ionized water for each time is 10-40 times of mass of a dried substrate of prepared aluminium hydroxide; a hydrated alumina filter cake is obtained after washing and filtering; content of the aluminium hydroxide in the filter cake is controlled to be 5-50%; and c) the accessory ingredient is added into one or various liquid in the step a) and step b); the filter cake after washing is formed by a normal forming method; and the formed filter cake is dried at a temperature of 80-120 DEG C and calcined at a temperature of 450-1000 DEG C to obtain a finished product of the aluminum oxide.

The invention discloses an environment-friendly metal surface treating agent and a using method thereof. The treating agent comprises fluoride, zircon salt, silane, silicon dioxide, accelerating agent, dispersing agent and stabilizing agent. A conversion coating having the advantages of being compact and even, strong in corrosion resistance and excellent in adhesive force of the coating is respectively formed on the metal surface of steel and zinc; a treatment method of the metal surface treating agent is simple and is operated at the normal temperature; the original phosphating treatment equipment can be used without any change; and strong acid and strong base are not used as the treating agent; therefore, the environment-friendly metal surface treating agent is safe in production without emission, and is the best substitute product of the phosphating treatment technique and an energy-saving type environment-friendly product.

Embodiments of the present invention concern methods, compositions, and apparatus for the continuous conversion of algal lipids into biodiesel. In some embodiments, the biodiesel is formed in a multi-step sequence, the first steps occurring in the presence of water and a strong acid wherein the lipids are released from the algae by means of mechanical and chemical action and are then hydrolyzed to free fatty acids. In a subsequent step, this free fatty acid mixture is reacted with methanol to generate fatty acid methyl esters (also known as biodiesel). Such methods produce biodiesel from algal lipids without the requirement for separate algal cell lysis or lipid extraction or purification prior to the acid catalysis sequence. In other embodiments, the multi-step acid catalysis sequence occurs at 100° C. at two atmospheres of pressure.

The invention discloses a method for extracting tungsten, titanium and vanadium from a waste SCR (selective catalytic reduction) catalyst, which comprises the following steps: crushing the waste SCR catalyst, adding a strongly alkaline solution, and reacting; filtering, separating, then adding strong acid into the sodium tungstate and sodium vanadate mixed solution, and reacting to obtain tungstic acid and a sodium salt and vanadic acid mixed solution; regulating the pH value of the sodium salt and vanadic acid mixed solution until precipitate is separated out, thus obtaining ammonium vanadate; then adding sulfuric acid into the tungsten-and-vanadium-removed SCR catalyst, and reacting to obtain a titanyl sulfate solution and solids such as aluminum slag and the like; then adding water into the titanyl sulfate solution, and hydrolyzing to obtain titanic acid and a waste acid solution; and finally, respectively calcining the obtained ammonium vanadate, tungstic acid and titanic acid to obtain vanadium pentoxide, tungsten trioxide and titanium dioxide. According to the invention, tungsten, titanium and vanadium can be extracted from the SCR catalyst through the reaction with strong alkali and strong acid at a low temperature, the equipment requirement is low, the energy consumption is low, some products having added values can be coproduced, and no secondary pollution is generated, thereby facilitating popularization and application.

The invention relates to a catalyst for synthesis of polyoxymethylene dimethyl ether, application of the catalyst in synthesis of polyoxymethylene dimethyl ether and a method for synthesizing polyoxymethylene dimethyl ether, and mainly aims to solve the problem that the catalyst has low selectivity and low yield for polyoxymethylene dimethyl ether which has a polymierization degree n of 2-10 in the prior art. The technical problem can be well solved by adopting a technical scheme that the catalyst is a metal ion modified hydrogenous strong-acid ion exchange resin, wherein the modifying metal is at least one of Al, Fe, Sn and Zn; and the ion exchange degree of the modifying metal in the catalyst is more than zero and less than or equal to 50 percent. The catalyst can be used in industrial production of polyoxymethylene dimethyl ether.

The invention relates to a hydrocracking catalyst with high activity and high-medium oil selectivity. According to the hydrocracking catalyst, amorphous silicon aluminum is used as a carrier, and a specially-modified Y-type molecular sieve is used as acid component, the molecular sieve has high degree of crystallization and low cell parameters, rich secondary holes, large surface area, less uniformly-distributed acid sites, no strong acid center, and most of medium-strength acid centers, and also has strong nitrogen-resisting performance and better damage capacity; and the hydrocracking catalyst using the molecular sieve has high hydrocracking activity and high middle oil selectivity, and stronger nitrogen resisting capacity. The catalyst provided by the invention is used in the process of producing an intermediate distillate product by adopting a heavy hydrocarbon single-section or one-section hydrocracking process, and has better activity and middle oil selectivity.

The present invention relates to shelf stable and/or less corrosive peroxycarboxylic acid antimicrobial compositions, including ready-to-use compositions. Shelf stable compositions can include defined ratios of hydrogen peroxide to peroxycarboxylic acid and/or hydrogen peroxide to protonated carboxylic acid, but need not include strong acid. Reduced corrosion compositions can include carboxylic acid and corrosion inhibitor at acid pH. Compositions of the invention can have advantageous activity against spores.

The large-area untrathin nano carbon tube film with well feature in microcosmic level comprises nano carbon tubes with centimeter-level length and more then 90wt% purity. Wherein, the least thickness of single-layer film can achieve 20nm with near transparent color and more then 10cm2 film area; there are multiple functional groups on tube surface. It also discloses the opposite preparation technique: with the macroscopic body of nano carbon tube, oxidating the macroscopic body in air; then, dipping into hydroperoxide; adding strong acid to poach till the liquid shows neutrality; finally, adding alcohol or acetone into the liquid to float the tube and form the film.

The invention relates to a preparation method of a homogenized fine nano-cellulose fiber. The preparation method can solve the problems of uniform diameter distributor of biomass nano-cellulose prepared by the existing strong acid hydrolysis method and the high-strength mechanical shearing method, easy gathering among the nano-fiber and a narrow range of applications of the TEMPO catalytic oxidation method. The preparation method comprises the following steps: 1) extracting biomass fiber with benzyl alcohol solution; 2) carrying out treatment by using acidified sodium chlorite; 3) carrying out gradient treatment with alkaline liquor; 4) using TEMPO, sodium bromide and sodium hypochlorite for catalytic oxidation treatment; 5) using sodium chlorite for treatment; and 6) carrying out nano-scale processing by using the long-term stirring method, the ultrasonic method or the high-pressure homogenization method, drying, and then obtaining the homogenized fine nano-cellulose fiber. The fiber has the uniform diameter distribution, the diameter is 3-5nm, the length-diameter ratio is not less than 500, the fiber is mutually interwoven into a mesh snarling structure, and the method is applicable to preparing the nano-cellulose fiber by using wood pulp, paper-making pulp, wood, bamboo and crop straw.

The present invention solves the problem that the existing strong acid resin catalyst has bad high temperature mechanical intensity and complex hole purification technics, brings forward a simple preparing method for pressurization polymerization and hole purification method, the pressurization polymerization improves the uniformity of polymer bead body structure and the high temperature mechanical stability for resin, the extraction is executed by solvent naphtha first and the boiling is executed by halogeno-alkane, the hole purification method is simplified. The prepared strong acid cation resin catalyst has high temperature resistant and excellent catalytic activity and its high temperature stability is better than same kind of product.

The present invention discloses a hollow microsphere preparation method, which uses a hydrogel microsphere as a template. The preparation method is that an emulsion or inverse emulsion polymeric method is adopted to synthesize the hydrogel microsphere with electric charge. A surfactant with inverse electric charge and hydrophobic monomer are added into the hydrogel microsphere suspension, and the hydrogel microsphere is coated by a polymer crust layer of the hydrophobic monomer by a seed emulsion polymerization method to form a core-shell microsphere with an inner layer of hydrogel and an outer layer of polymer; a hydrolyzation of a silicon dioxide or titanium dioxide precursor is used to form the core-shell microsphere with the outer layer of inorganic matter and the inner layer of hydrogel. The core-shell microsphere is dried to obtain the hollow microsphere. The method of the present invention does not need removing the template by organic impregnant dissolving, strong acid or strong alkali etching or high temperature calcining; the preparation process is safe and the operation is simple; and the hollow microsphere with different chemical components can be obtained by changing core or shell.

A CMP polishing slurry of the present invention, contains cerium oxide particles, a dispersant, a polycarboxylic acid, a strong acid having a pKa of its first dissociable acidic group at 3.2 or less, and water, the pH of the polishing slurry is 4.0 or more and 7.5 or less, wherein the strong acid is contained 100 to 1,000 ppm or 50 to 1,000 ppm, or the strong acid is a monovalent strong acid contained 50 to 500 ppm or is a bivalent strong acid contained 100 to 1,000 ppm. The preferable polycarboxylic acid is a polyacrylic acid. The present invention allows polishing in the CMP methods of surface-smoothening an interlayer dielectric film, a BPSG film and a shallow-trench-isolation insulation film with high speed operation efficiently and easier process management and cause smaller fluctuation in film thickness due to difference in pattern density.

The invention discloses a preparation method of low-cost strong-acid hierarchical-pore Beta zeolite, and relates to a preparation method of hierarchical-pore Beta zeolite. The problem that the acidity of an existing desilicication post-treatment hierarchical-pore Beta zeolite molecular sieve is weakened is solved. The preparation method comprises the steps of 1. calcining Beta zeolite to obtain microporous hydrogen type Beta zeolite; 2. adding the microporous hydrogen type Beta zeolite into an alkaline solution, stirring, and washing and drying to obtain sodium type desilicication hierarchical-pore Beta zeolite; 3. adding the sodium type desilicication hierarchical-pore Beta zeolite into an ammonium nitrate aqueous solution for exchange, and calcining to obtain hydrogen type desilicication hierarchical-pore Beta zeolite; and 4. adding the hydrogen type desilicication hierarchical-pore Beta zeolite into an acidic solution, stirring, washing and drying, and repeating the step 3 to obtain the strong-acid hierarchical-pore Beta zeolite.

Crosslinked polybenzoxazines obtained by crosslinking a monofunctional first benzoxazine monomer and a multifunctional second benzoxazine monomer with a crosslinkable compound, an electrolyte membrane including the same, a method of preparing the electrolyte membrane, a fuel cell including the electrolyte membrane having the crosslinked polybenzoxazines using the method. The crosslinked polybenzoxazines have strong acid trapping capability, improved mechanical properties, and excellent chemical stability as it does not melt in polyphosphoric acid. Even as the amount of impregnated proton carrier and the temperature are increased, mechanical and chemical stability is highly maintained, and thus the electrolyte membrane can be effectively used for fuel cells at a high temperature.

A process for preparing the biological diesel oil from the animal fat or vegetative oil with high acid number includes esterifying by glycerine under existance of strong acid catalyst, distilling in azeotropic solvent for removing water, mixing with methanol, transesterifying reacting to remove glycerine, water washing, and low-temp treating for removing high-smelting-point substances to obtain methyl ester of fatty acid, which is just the biological diesel oil.

The present invention provides a method of preparing a 4-(arylmethyl)amino-1H-imidazo(4,5-c)quinoline of formula (4) by reacting an arylmethylamine of formula (3) with a 4-chloro-1H-imidazo(4,5-c)quinoline of formula (2). The present invention further provides a method of preparing an acid addition salt of formula (5) comprising the step of hydrolyzing a 4-(arylmethyl)amino-1H-imidazo(4,5-c)quinoline of formula (4) with a strong acid, HX. The present invention further provides a method of preparing a 4-amino-1H-imidazo(4,5-c)quinoline of formula (1) comprising the step of treating an acid addition salt of formula (5) with a base.