81results about How to "Easy to separate by filtration" patented technology

The invention discloses a method for synthesizing vinylene carbonate, and the method mainly comprises the following steps: (1) chlorine gas is introduced into the raw material of ethylene carbonate in ultraviolet light condition, thus synthesizing chlor-ethylene carbonate; (2) taking mixture of ester, ether and hydrocarbon as the organic solvent, the chlor-ethylene carbonate which is obtained in the step (1) produces elimination reaction with triethylamine, thus eliminating hydrogen chloride and generating the vinylene carbonate; and (3) the mixed product obtained in the step (2) is distilled and purified after filtration. By adopting the mixed solvent of ester, ether and hydrocarbon, the reaction product is easily isolated from triethylamine hydrochloride, thus increasing the yield and the production efficiency; and BHT can be used as a polymerization inhibitor in the reaction process, thus controlling the polymerization of the vinylene carbonate effectively and increasing the yield.

The invention discloses a selective-oxidized chitosan and a heterogeneous preparation method thereof. The method is characterized in that according to preparation of the oxidized chitosan, macromolecular chitosan is dissolved in an ionic liquid, the chitosan is precipitated from the ionic liquid by adding absolute ethyl alcohol, and porous chitosan is obtained after the ionic liquid in a precipitation is fully replaced through absolute ethyl alcohol dipping and ultrasonic oscillation; the porous chitosan is moistened and expanded in the ionic liquid to form a semisolid gel with certain viscosity, and then partial or all hydroxyls at C6 position in pyranose rings of the chitosan are selectively oxidized into carboxyls in an ionic liquid medium to obtain the selective-oxidized chitosan with adoption of a concentrated nitric acid-concentrated phosphoric acid-sodium nitrite system. According to the method, operation is simple and convenient, the oxidation reaction rate is high, the oxidation degree of the chitosan is easily controlled, oxidation products are easy to separate, the yield of the products is high, the prepared carboxyl chitosan has good antibacterial activity and water solubility, and the ionic liquid can be recycled for cyclic utilization, which is environmentally friendly.

The invention provides a method for preparing a titanium-silicon molecular sieve with large particle diameter. The method comprises the following steps of: preparing dispersion liquid of a first-level crystalline particle molecular sieve; adding a flocculating agent and a coagulant aid into the dispersion liquid, and gathering the particles so as to form gathered particle solution; mixing the gathered particle solution and titanium-silicon template synthetic cement; and performing a hydrothermal process. The titanium-silicon molecular sieve prepared by the method has an average particle diameter of more than 5 microns; and when serving as a contact agent for preparing cyclohexane oxime, the titanium-silicon molecular sieve has high conversion rate and selection rate, and has the advantage of easiness for filtering and recycling.

The invention provides a process method for improving the quality of non-combustible recycled tobacco leaf heated by thick slurry method and application thereof, A technology for manufacture the heated non-combustible recycle tobacco leaf by the thick slurry method, a material is added in two steps to prepare a homogenate. The composite biological agent is absorbed through the biomaterial immobilized carry. A tobacco raw material is pretreated by adsorption fermentation, subsequent to filt removal of that carrier, secondly, the pretreated tobacco raw material is subjected to high-temperature catalytic lignin pyrolysis under the alkaline condition to increase fragrance and prickle and Maillard reaction to increase fragrance, then when the heated non-combustible recycled tobacco leave is prepared by the conventional process of thick slurry method, wherein the tobacco leaves are rich in fragrance, have beautiful milk fragrance, chocolate fragrance and baking fragrance, have moderate strength, lower irritation and spicy taste, and improve smell and reduce wood flavor; In the new heating non-combustible cigarette application, harmonious and beautiful aroma, improve smoke aroma, improvedtaste, comfortable taste.

The invention discloses a deep purification technology of a high concentration sodium aluminate solution. The technology adopting an industrial sodium aluminate solution as a raw material comprises the following steps: applying an electric field, adding an oxidant to make iron and other impurities generate insoluble precipitates, and removing organic matters; adding lime to remove silicon in order to generate hydrogarnet for adsorbing the above impurities, and adding a flocculating agent to further remove iron, silicon and organic matters in the obtained solution in order to obtain a first stage purified solution; adding a precipitating agent into the first stage purified solution, adding an adsorbent, standing, and filtering to obtain a second stage purified solution; and carrying out deep filtration on the second stage purified solution by adding macroporous anion resin in order to obtain a highly pure sodium aluminate solution. Deep purification of the sodium aluminate solution can be realized in a low cost, high efficiency and environmental protection manner.

The invention relates to a method of producing a pearl liquid, a pearl ginseng liquid and pearl powder easily absorbed by a human body by using pearl powder as a traditional Chinese medicinal material, which belongs to the technical field of production of the pearl liquid. The method comprises the following steps of firstly, preparing the pearl powder or pearl layer powder; secondly, dissolving with hydrochloric acid until the PH value reaches 6.4 to 6.6; thirdly, diluting, and filtering with filter paper to obtain conchiolin; fourthly, combining a plurality of parts of the conchiolin in the third step, and hydrolyzing the combined conchiolin with citric acid; fifthly, neutralizing until the PH value reaches 4.4 to 4.6 to obtain liquid A; sixthly, continuously neutralizing the liquid A until the PH value reaches 8, and precipitating the liquid for 3 to 4 hours; seventhly, filtering with filter paper to obtain liquid B and filter residues C; eighthly, adding the liquid B into a blending formula for conditioning according to the weight percentage of the preset volumetric yield of products; ninthly, filtering with filter paper to discharge the residues; tenthly, filling with the liquid and sterilizing to obtain a pearl liquid or pearl liquid ginseng liquid product; eleventhly, drying, crushing and packaging the filter residues C to obtain a calcium citrate supplementing agent; twelfthly, drying, crushing and packaging the liquid A.

The invention discloses a chitosan porous microballoon loaded copper iodide catalyst as well as a preparation method and an application thereof, belonging to the technical filed of preparation process of chemical catalysts. The catalyst is characterized in that the carrier of the catalyst is chitosan porous microballoon, the diameter of microballoon is 0.5-3mm, the surface aperture is 5-30mm and the inner aperture is 1-10 mu m; and the active component is copper iodide and the mass percent of the active component is 10-30% of the carrier. When the chitosan porous microballoon loaded copper iodide catalyst provided by the invention is used in a coupling reaction for catalyzing Heck, the catalyst has excellent and stable property, and is beneficial to reducing the cost and environment pollution.

The invention discloses an immobilized cesium phosphotungstate catalyst. Cesium phosphotungstate is introduced in the synthesis process of a metal-organic skeletal material UiO-66 to make the mass ratio of the active component cesium phosphotungstate to the metal-organic skeletal material UiO-66 in the metal organic skeletal immobilized cesium phosphotungstate catalyst reach 0.2-0.65 and the specific surface area of the immobilized catalyst reach 794-1045m<2> / g. A preparation method adopting one-step in situ synthesis can effectively prevent loss of the active site cesium phosphotungstate, so the physical and chemical stability of the catalyst is improved; the Keggin structure, the strong acidity and the oxidation reduction property of cesium phosphotungstate are well kept, so the catalyst has wide application range; adsorption and diffusion of reaction substances on the catalyst are facilitated, so the catalysis efficiency of the catalyst is increased; and the preparation method has the advantages of simplicity, easy operation, easy filtration and separation of the catalyst from products, no corrosion, and no pollution to environment.

The invention relates to a preparation method of particles of a copolymer containing ethylene and vinyl alcohol structural units. The copolymer is an ethylene-vinyl alcohol bipolymer or an ethylene-vinyl alcohol-vinyl acetate terpolymer, and the method comprises the following steps: (1) preparing a copolymer / a solvent / a water solution, (2) preparing the particles of the copolymer, and (3) removing a residual catalyst in the particles of the copolymer. The effect of the preparation method is as follows: 1) solid particles of the copolymer which has uniform and adjustable particle size and internally contains micro channels can be obtained, the adjustable particle size is in the range of 0.1-10mm, and the micro pore diameter is 0.005-0.1mm. Compared with the prior art, filtration and separation are simple, the separation efficiency is improved by more than 30 times, and the drying process does not agglomerate, does not produce dust and static electricity; 2) by adjusting the process conditions, control on copolymer solid shape and size can be realized; and 3) the removal effect of catalyst residues and by-products can be improved, the times of washing is reduced, the water consumption is reduced by more than 1 / 3, the washing time is shortened to 1 / 10 or less, and the quality of the product is improved.

The invention provides a preparation method and application of a composite tobacco leaf extract. Aired tobacco stems, corn cobs and a rice bran composite biological material are adopted as immobilization carriers for adsorbing microbial aroma-producing strains, compounded and aired tobacco leaf raw materials are subjected to incubated hydrolysis fermentation, and then in combination with a continuous countercurrent ultrasonic extraction technology, the composite tobacco leaf extract is prepared. The composite tobacco leaf extract has rich natural tobacco fragrance and has a fresh fruit aroma,a wine aroma, a milk aroma, a barbecue meat aroma, a baked bread aroma, a roasted cheese aroma and other rich natural complex aromas, the irritating property is reduced, the quality of the spices is improved, the purification and separation steps are simple, the process conditions are mild, the extraction rate is increased, and the production efficiency is improved; the composite tobacco leaf extract is applied to traditional cigarettes and novel heat-not-burn cigarettes and is harmony with cigarette fragrance and uniform in style, the concentration of the smoke is increased, the satisfactionfeeling is improved, the cigarette fragrance is enhanced, the irritating property is reduced, and the taste is improved.

The invention provides a preparation method of a compound 2-[2-(dimethylaminoethyl) methylamino]-3-acrylamido-5-[4-(1-methyl-1H-indole-3-yl) pyrimidine-2-amino]-6-(2, 2, 2-trifluoroethoxy) pyridine asshown in a formula I, a used intermediate and a preparation method of a related intermediate. According to the method, 3-(2-chloropyrimidine-4-yl)-1-methyl-1H-indole and a compound shown as a formulaVII are subjected to a condensation reaction, a substitution reaction, a reduction reaction, an acylation reaction and an elimination reaction, and a compound shown as a formula I is obtained. The preparation method disclosed by the invention is environment-friendly, low in cost, mild in condition, simple to operate, high in yield, high in final product purity and suitable for industrial production.

The invention discloses a clarifying agent for reducing acid and gel in fruit and vegetable juice and liquors, and a preparation method of the clarifying agent. The clarifying agent is prepared from the following ingredients in percentage by weight: 17%-45% of mixed calcium salt, 2%-6% of noncalcified gel, and 50%-80% of a sodium alga acid. The preparation method of the clarifying agent for reducing acid and gel in fruit and vegetable juice and liquors comprises the following steps: uniformly stirring the ingredients with mixed calcium salt, and enabling the mixed calcium salt to be made into particles by stamping; coating the surface of the mixed calcium salt with the noncalcified gel; and finally, coating the outer layer of the noncalcified gel with the sodium alga acid. The preparation method disclosed by the invention is simple and convenient in preparation process, the acid and gel reduction can be performed in real time, and the effects are obvious.

The invention provides a method for preparing a powdery metallic ion adsorbent and belongs to the technical field of adsorption. The powdery metallic ion adsorbent is prepared from thiosemicarbazide, formaldehyde and urea through a one-step method in an aqueous solution. In the synthesis reaction of terpolymers, the charging ratio of the thiosemicarbazide to the formaldehyde is unchanged, and a series of thiosemicarbazide / formaldehyde / urea terpolymer adsorbents are prepared by changing the charging ratio of the urea. By adding the urea into the reaction system of the thiosemicarbazide and the formaldehyde, the performance of the adsorbent is improved, the hydrophilicity and the adsorptive selectivity of the adsorbent are improved; and moreover, the cost is lowered, and the application and the popularization are facilitated. By measuring the adsorption capacity of a plurality of metallic ions, the results show that the sequence of adsorption capacity of five kinds of metallic ions is Ag (I) >Hg (II) >Cu (II) >Cd (II) >Zn (II). The adsorbent can be used for concentration of noble metallic ions and sewage treatment.

The invention relates to a separation method of lysine bacteria, comprising the following steps: 1) adding assistant agents to fermentation liquor and mixing for 1 to 60 minutes; 2) pressing the fermentation liquor treated with the assistant agents into a plate and frame filter press for filtering. The used assistant agents comprise inorganic polymeric ferric and poly-aluminum assistant agents, and organic anionic assistant agents. Compared with the current common separation methods in the prior art, the invention has the advantages of simple and practical technique, low consumption of water, electricity and steam, low equipment investment, low maintenance cost, low moisture content and high yield of the obtained bacteria.

The invention discloses a preparation method of econazole nitrate. The preparation method comprises the steps of with 1-(2,4-dichlorophenyl)-2-(1-imidazolyl)ethanol (imidazole ethanol for short) and p-chlorobenzyl chloride as raw materials, Ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([bmin]BF4) as a solvent and an in-phase reaction catalyst, tetrabutylammonium bromide (TBAB) as a phase transfer catalyst, isopropanol as a solvent and anhydrous potassium carbonate as a basic catalyst, carrying out O-alkylation reaction, acidification and recrystallization, so as to obtain econazole nitrate. The preparation method is simple and convenient in operation, mild in reaction conditions and high in yield, the purity of prepared econazole nitrate is higher than 99.9%, and the preparedeconazole nitrate has very high industrial application values.

The invention belongs to the field of organic chemistry, and discloses a method for preparing diphenyl silanediol. The method comprises the following steps: adding diphenyl dialkoxysilane and an organic solvent into a reaction vessel, uniformly stirring, adding deionized water and an acid catalyst, heating to 55-65 DEG C, refluxing for 4-6 hours, cooling, aging, filtering, and carrying out rotary evaporation to obtain the diphenyl silanediol. The diphenyl silanediol is an acicular crystal. By using the diphenyl dialkoxysilane as the raw material, the prepared diphenyl silanediol has high conversion rate, and the product content is up to 99.7%; and the adopted raw material is free of chlorine, thereby effectively avoiding the introduction of chlorine ions. The method has the advantage of mild reaction temperature; and due to the adoption of normal temperature crystallization, the diphenyl silanediol is easy for filtration and separation.

The invention discloses a coagulant for water-based ink wastewater and a water-based ink wastewater treatment method, and belongs to the technical field of wastewater treatment. The coagulant for thewater-based ink wastewater comprises dilute sulfuric acid, polyaluminum chloride, activated carbon and vermiculite powder. According to a water-based ink wastewater treatment method, the coagulant isadopted for flocculent precipitation of the wastewater. The treatment method disclosed by the invention is rapid and simple, is a combined treatment technology, requires light and simple equipment, can be freely combined and moved, is particularly suitable for enterprises or units which intermittently produce sewage and produce less sewage at a time, and can be used for timely treatment after production.

The invention provides a method for measuring the content of free carbon in molybdenum carbide. The method comprises the following steps: (1) adding molybdenum carbide powder into nitro-hydrochloric acid and stirring to dissolve molybdenum carbide in nitro-hydrochloric acid and allowing free carbon to disperse in an undissolved state in nitro-hydrochloric acid, the mass and unit of the molybdenum carbide powder being m0 and g respectively; (2) performing first drying treatment on filter paper, the mass and unit of the filter paper subjected to first drying treatment being m1 and g respectively; the filter paper being binder-free glass fiber filter paper; (3) performing filtration treatment on nitro-hydrochloric acid using filter paper, performing secondary drying treatment after washing with deionized water, and the mass and unit of the filter paper subjected to secondary drying treatment being m2 and g; (4) calculating the mass percentage content x of free carbon in the molybdenum carbide powder. The content of free carbon is detected and analyzed using nitro-hydrochloric acid and binder-free glass fiber filter paper. The design is reasonable, the operation is convenient and easy, the detection error is less, and the result accuracy is high.

The invention discloses a method for preparing hypophosphorous acid (salt) and gluconic acid (salt) from glucose phosphate serving as a raw material, which comprises the following steps of: (1) preparing raw materials: preparing subphosphate or acid phosphate and glucose, and taking water as a solvent; (2) heating: continuously heating mixed solution at the temperature of more than or equal to 100DEG C under the air pressure of more than or equal to 0.01MPa for more than 10 minutes; (3) separating: adding a separating agent, concentrating, and separating to obtain crude products of gluconic acid salt and hypophosphorous acid salt; (4) purifying: filtering to remove precipitates to obtain gluconic acid, adding a gas or a solvent capable of reacting with the hypophosphorous acid salt into aqueous solution of the separated hypophosphorous acid salt, and filtering to remove precipitates to obtain hypophosphorous acid; (5) preparing the hypophosphorous acid salt: reacting the hypophosphorous acid with basic oxide or hydroxide to obtain the hypophosphorous acid salt; and (6) preparing the gluconic acid salt: reacting the gluconic acid with basic oxide or hydroxide to obtain the gluconicacid salt. The production process is environment-friendly and harmless, raw materials are readily available, the cost is low, the yield is high, the period is short and the safety is achieved.

The invention relates to the technical field of desulfurization, and provides a sulfur precipitant, a desulfurization system and an application thereof, the sulfur precipitant provided by the invention comprises 5-15% of an Nacylamino acid type surfactant, 0-1% of a polyethylene glycol type nonionic surfactant, 0-1% of an organosilicon surfactant, 0.1-1% of low carbon alcohol and the balance of water; wherein the content of the polyethylene glycol type nonionic surfactant and the content of the organic silicon surfactant are not zero at the same time. The sulfur precipitator provided by the invention can effectively change the state of sulfur in the desulfurization liquid, reduce the surface tension of the liquid, wet the sulfur, enable the sulfur to sink after being wetted, and effectively prevent the sulfur from being adhered and blocked, so that the problems that sulfur particles float upwards and are difficult to separate from the desulfurization liquid are solved, and the stable operation period of the device is prolonged. The desulfurization system provided by the invention is stable in performance and high in hydrogen sulfide purification degree, and sulfur generated by thesystem sinks under the action of the sulfur precipitant, is easy to filter and separate, and is not easy to generate sulfur blockage.

A preparation method of storax oil for improving quality includes: residue, generated after liquidambar orientalis peel is used for squeezing resin, is subjected to incubation hydrolytic fermentationby using composite microorganisms and an enzyme preparation that are adsorbed by tobacco stems, corncobs and tobacco stems; then water vapor distillation is carried out to extract and prepare storax volatile oil. The product has abundant and natural fragrances such as refreshing flower flavor, milk-like flavor, cinnamon oil and cinnamon fragrance, gentle spicy smell, lemon fragrance and the like.The method is reduced in irritation and is improved in perfume quality, is improved in extraction rate, employs low-cost and accessible raw materials and is gentle in technical conditions. The productis applied to cut tobacco and cigarette paper in cigarettes and has abundant and natural fragrances such as refreshing flower flavor, milk-like flavor, cinnamon oil and cinnamon fragrance, gentle spicy smell, lemon fragrance and the like, can reduce irritation and can improve taste.

The invention provides a burley tobacco extract applied to a heated-non-combustible cigarette and an application of the burley tobacco extract. With a composite biological material of burley tobacco stems and bagasse as an immobilized carrier, biological preparations, including a microbial aroma-producing strain and enzyme, are adsorbed; burley tobacco powder is incubated, hydrolyzed and fermented; and in combination with a continuous counter-current ultrasonic solvent extracting technology, the burley tobacco extract is prepared, and the burley tobacco extract can be combined with propylene glycol; intrinsic intense fragrance of natural tobacco is reserved; characteristic smell of burley tobacco is relieved and irritation is reduced; the burley tobacco has natural composite fragrance of fresh fruity aroma, smell of caramel, smell of being roasted and the like; the preparation method of gentle in process conditions, high in extracting rate and high in production efficiency; the burleytobacco extract is applied to a novel heated-non-combustible cigarette material; the burley tobacco extract is coordinate with cigarette fragrance and uniform in style, and the burley tobacco extractcan increase smoke concentration, enhance feeling of being satisfied and enrich cigarette aroma; and irritant smell of burley tobacco is obviously reduced, and taste is improved.

A process for preparing the catalyst used to hydrogenate methyl ester of fatty acid and a process for preparing its carrier SiO2 are disclosed. Said catalyst is a two-element CuNi one and features high stability, specific surface area and activity, easy filteration and separation, and less residual Cu in hydrogenated product.

The invention relates to a method for preparing silicon dioxide and aluminum oxide, in particular to a method for preparing silicon dioxide and aluminum oxide from coal ash. In the method, the coal ash, sodium carbonate and calcium oxide are used as raw materials, the sodium carbonate is causticized in situ by the calcium oxide, and is dissolved with alkali in a high-temperature high-pressure reaction system to form sodium silicate, calcium carbonate and desiliconized coal ash solid, wherein the sodium silicate solution is carbonated by CO2 to form silicon dioxide; and aluminum oxide and foamconcrete can be prepared from the calcium carbonate and the desiliconized coal ash by a soda lime sintering method. Residues after aluminum oxide preparation can be used as a raw material for preparing a tail gas purification absorbent in cement and chemical plants and coal burning boilers, and the foam concrete. Compared with the prior art, the method has the advantages of weak reacting solutioncorrosion, high desiliconization rate, low metal content of prepared sodium carbonate and high white carbon black quality, high aluminum oxide extraction rate and the like; meanwhile, the raw material source is wide, the process is simple, the production cost is low, and the product additional value is high.