64results about How to "Raise the basicity" patented technology

The invention provides a preparation method of biomass-based nitrogen-containing porous carbon with the advantages that simplicity is realized; the implementation is easy; the cost is low. According to the method, the in-situ doping of nitrogen atoms in the carbon material preparation process is realized by a one-step foaming method; cheap and reproducible protein-rich plants are used as carbon precursors; the in-situ doping of nitrogen atoms in the carbon material preparation process is favorably realized, so that the doping content is controllable, and the distribution is uniform. All raw materials are renewable resources; green and environment-friendly effects are achieved; simplicity is realized; the obtaining is easy; the resources are rich; the cost is low. Meanwhile, the method provided by the invention has the advantages that the nitrogen-doped porous carbon material with the large specific surface area can be obtained without complicated multistep operation; the preparation process is simple; the use of high-pollution chemical reagents such as ZnC12, strong base and strong acid is avoided; the environment-friendly effect is achieved; the operation is convenient; equipment cannot be corroded in the production and use processes; the method is suitable for large-scale production.

The invention provides a method for preparing a magnesium oxide modified mesoporous material for adsorbing carbon dioxide. The material is prepared by using a one-step synthetic method, namely the method comprises the following steps of: dissolving P123 serving as a template agent and MgCl2.6H2O into hydrochloric solution fully, adding tetraethyl silicate, and drying and calcining the mixture to prepare the MgO modified mesoporous material directly; or the material is prepared by using a later-period immersing method, namely the method comprises the following steps of: dissolving the P123 serving as the template agent into the hydrochloric solution fully, adding the tetraethyl silicate, immersing a mesoporous material prepared by drying and calcination in MgNO3 solution, and calcining the mesoporous material to prepare the MgO modified mesoporous material. The material provided by the invention has the high capability of adsorbing carbon dioxide, and simultaneously, the preparation method is simple and easy to control and avoids equipment corrosion in the process of production and use.

The invention relates to a method for producing polyaluminium chloride, which comprises the following steps: adding aluminum-containing waste residue into solution of hydrochloric acid and reacting at 90 to 120 DEG C and under a normal pressure for 3 to 5 hours; filtering, collecting mother solution, filling the mother solution into an acid-resistance and vapor-heated reactor with a stirring device, starting stirring, supplying a proper amount of water, starting to add calcium aluminate powder, and after the addition is finished, regulating the density of feed liquid to more than or equal to 1.20g/ml with water; and adding a synergist, heating and keeping the temperature between 90 and 120 DEG C, reacting at normal temperature for 3 to 5 hours, and obtaining finished liquid polyaluminium chloride. Compared with the prior art, the method, which uses aluminum-containing waste residue obtained after the neutralization of waste liquid from surface pickling of aluminum ingots and bands as raw material, reduces the manufacturing cost of polyaluminium chloride, recycles aluminum-containing waste residue and is in accordance with the environmental-protection concept of energy conservationand emission reduction.

The invention discloses a coal ash catalyst and a preparing method and application thereof. According to the coal ash catalyst and the preparing method and application thereof, environment-friendly Pt, Cu, Rh, Ni and Ru metal is used as the catalyst activity centers of the catalyst, solid waste coal ash obtained before treatment or after treatment serves as carriers, the catalyst activity centers are fixed to the carriers in a loaded mode, and the weight percent of the catalyst activity centers is 0.5% to 5%. The preparing method includes the steps that 1, the metal activity centers are loaded on the coal ash with a soaking method; 2, the powder prepared in the step 1 is dried and then reduced through hydrogen, and the coal ash catalyst is obtained. The coal ash catalyst is used for preparing pentanediol in the mode that hydrogen is added into furfural. The catalyst is environmentally friendly, waste resources are used, the environment is protected, alkaline sites of the simply-treated coal ash are greatly increased, and the reaction that hydrogen is added into furfural to prepare pentanediol is facilitated.

The invention provides a method for preparing mullite and co-producing polyaluminum chloride by using high-alumina fly ash. The method comprises the steps: activating the high-alumina fly ash in concentrated hydrochloric acid, carrying out liquid-solid separation, and carrying out washing, so as to obtain first washed solid and first washing liquid; subjecting the first washed solid to a desilicification reaction in a concentrated base solution, carrying out liquid-solid separation, and carrying out washing, so as to obtain second washed solid and second washing liquid; washing the second washed solid in dilute hydrochloric acid, carrying out liquid-solid separation so as to obtain third solid and third washing liquid, and washing the third solid by water, so as to obtain fourth solid and fourth washing liquid; carrying out aftertreatment on the fourth solid so as to obtain the mullite, and preparing the polyaluminum chloride from the first washing liquid and/or the third washing liquid. The mullite prepared by the method is low in impurity content, high in bulk density and low in water absorption rate, the polyaluminum chloride flocculant can be coproduced, the source of raw materials is wide, the process is simple, and the acid/base consumption is low, so that the method has good economic, social and environmental benefits.

The invention discloses a preparation method of an iron-cobalt alloy/nitrogen co-doped carbon aerogel electrode material, and relates to the field of catalyst preparation. The preparation method comprises the following steps: dispersing sodium alginate and polypyrrole in water to form a first solution, and dispersing ferric salt and cobalt salt in water to form a second solution; dropwise adding the first solution into the second solution, standing for 1h to obtain hydrogel, freeze-drying, performing calcining in nitrogen at high temperature for 1h, and pickling a sample to obtain carbon aerogel; and dipping and doping the solid powder into melamine, performing drying, and performing roasting in N2 to obtain the sodium alginate-based iron-cobalt alloy/nitrogen co-doped electrode material.The catalyst has oxygen reduction (ORR) and oxygen evolution (OER) bifunctional catalytic performance, and the zinc-air battery assembled by the catalyst has high power density and good charging and discharging performance. According to the method, cheap biomass seaweed is recycled, the preparation process is non-toxic and harmless, the cost is low, and the method has a wide industrial applicationprospect.

The invention provides a method for preparing aluminum polychlorid from byproducts generated in methyl diethyl phosphate production. The method comprises the following steps: (1) dispersing byproductsolid dregs into a solvent, analyzing, and collecting a solution; (2) cooling the solution with water, and separating aluminum chloride hydrate crystal; (3) hydrolyzing and polymerizing the aluminum chloride hydrate crystal, and aging, thereby obtaining the aluminum polychlorid. By adopting the method, solid dregs rich in sodium tetrachloroaluminate are adopted as a raw material, an inorganic polymeric flocculant, namely the aluminum polychlorid, is successfully prepared through steps of simple processes, and not only is the problem of waste disposal solved, but also a high additional value product can be successfully made.

Disclosed herein is a transition metal-substituted hydrotalcite catalyst for removing nitrogen oxides using a storage-reduction method, in which a molar ratio of transition metal to magnesium is 0.2 or less, and a method of manufacturing a transition metal-substituted hydrotalcite catalyst for removing nitrogen oxides using a storage-reduction method, including the steps of preparing a hydrotalcite synthesis solution including transition metal precursors such that the molar ratio of transition metal to magnesium is 0.2 or less, and preferably 0.001 to 0.2; aging the synthesis solution; and hydrothermally treating the synthesis solution.

The present invention provides methods for enhancing the fragmentation of peptides for mass spectrometry by modifying the peptides with a tagging reagent containing a functional group, such as a tertiary amine, having a greater gas-phase basicity than the amide backbone of the peptide. These high gas-phase basicity functional groups are attached to a peptide by reacting the tagging reagent to one or more available carboxylic acid groups of the peptide. Linking these high gas-phase functional groups to the peptides leads to higher charge state ions from electrospray ionization mass spectrometry (ESI-MS), which fragment more extensively during fragmentation techniques, particularly non-ergodic fragmentation techniques such as electron capture dissociation (ECD) and electron transfer dissociation (ETD).

The invention provides an improved catalyst for production of methanol by means of carbon dioxide hydrogenation, aiming at improving the catalytic activity and stability of the catalyst. The graphene-doped catalyst is prepared by using a parallel flow coprecipitating method; the invention in particular relates to nitrogen-doped graphene doped in the catalyst; the prepared catalyst utilizes the physical and chemical properties of the nitrogen-doped graphene, and the introduced nitrogen-doped graphene has the double functions of an auxiliary agent and a carrier and is high in gas absorption property and high in dispersity of metallic particles, so that the catalyst can easily form a catalytic activity center in a catalytic reaction, CO2 and H2 are easily absorbed, and the CO2 conversion rate, the methanol selectivity and the methanol yield are improved.

The invention discloses an iron-based compound water treatment agent FPFS-1 and a preparation method thereof. The preparation method comprises the following steps: dissolving green copperas with water, adds sulphuric acid and a catalyst into the mixture for reaction to make Fe2+ completely oxidized and polymerized to form inorganic polymer compound liquid polymeric ferric sulfate, wherein the reaction temperature is room temperature, the reaction time is between 0.5 and 4.0 hours, and the material weight ratio of ferrous sulfate heptahydrate to the sulphuric acid to the catalyst is 100:4-20:3-10; and then adding an organic polymer compound into the obtained liquid polymeric ferric sulfate for compounding to form a colloidal FPFS-1 product of the invention. Tests show that the total iron accounts for 11 to 13 mass percent of the product, the basicity of the product is between 12 and 16 percent and the reducing substance (taking Fe2+ as a reference) accounts for less than 0.005 mass percent of the product. The iron-based compound water treatment agent FPFS-1 obviously improves the flocculation performance, has rapid sedimentation and clear water in the water treatment process, has good sediment filter performance, has no iron ion migration and has the unique characteristics of removing COD, BOD and chroma and deodorizing.

The invention relates to a preparation method of a high-purity high-basicity nanoscale PACS flocculating agent. The method comprises the following steps: (1) generating a first-stage PAC material; (2) generating a second-stage high-purity PAC material; (3) performing primary separation on the materials; (4) performing secondary separation on the materials. The PACS flocculating agent prepared by the preparation method has a nanoscale crystal structural form, and the hydroxyl polymerization degree and basicity are increased remarkably, so that the organic high molecular weight is increased, and a very good water purifying effect is achieved.

The invention provides a method for preparing slag-free PAC by means of a high-efficiency emulsification shear stirring technology. The method comprises the steps of acid dissolution, recapturing andemulsification shear stirring. The method has the advantages that waste alkali is used for replacing traditional bauxite resources, dust pollution is avoided, no secondary hazardous waste is generated, and the quality of products is ensured; the PAC is quickly prepared by means of the novel high-efficiency emulsification shear mixing technology, the operation is simple, the processing capacity islarge, the production cycle is short, the yield is high, the energy consumption is low, the equipment investment cost is low, and the cost is low. Regeneration and comprehensive utilization of resources including aluminum-containing sludge, waste hydrochloric acid and waste alkali are achieved, waste is turned into treasure, sustainable development of upstream enterprises is ensured, the production cost of the enterprises is saved, and double benefits of economy and environmental protection are achieved. The prepared slag-free PAC is pure, clear, stable in quality, good in fluidity and dispersibility and capable of achieving higher basicity, and the decolorization and turbidity removal capabilities of the PAC are 5-10% times higher than those of general PACs sold on the market.

The invention provides a PAFC (polyamuminum ferric chloride) liquid product and a preparation method thereof. According to the preparation method of the PAFC liquid product, during stirring, a sodium hydroxide solution is added to an aluminum chloride and ferric chloride mixed solution in a spray form, precipitate caused by excessive high local pH can be effectively avoided, the time required for preparation of the PAFC liquid product is greatly shortened, meanwhile, the PAFC liquid product with high concentration can be prepared from reaction raw materials with higher concentration, and a large amount of energy can be saved for the following drying procedure. The PAFC liquid product has higher concentration and higher basicity than those of conventional PAFC liquid products in the prior art and can meet higher use requirements as a liquid product, and a large amount of energy can be saved for the following drying procedure in production of solid products.

The invention discloses a method for recycling copper by-product polyaluminum chloride from an acidic CuC12 waste etching solution. The method is characterized in that a material containing metal aluminum is directly added into the acidic CuC12 waste etching solution to be substituted for copper in the solution; or, free hydrochloric acid in the acidic CuC12 waste etching solution is heated and evaporated at first, then, a material containing metal aluminum is added to be substituted for copper in the solution, filtration is carried out, and copper powder or copper sponge and a cementation leaching solution are obtained. The obtained copper powder is washed, dried and sold. The obtained copper sponge is washed and electrolytically refined, and cathode copper is obtained; alkaline matter is added into the obtained cementation leaching solution; and evaporation and concentration are carried out after the pH value is adjusted, a polyaluminum chloride product is obtained, the copper and chlorine in the acidic CuC12 waste etching solution are sufficiently utilized, and zero emission in the copper separation and recovery technological process is achieved. The method has the advantages of being simple in technology, low in comprehensive recovery cost, good in economic benefit and the like.

The invention discloses a catalyst of preparing isophorone by condensation of acetone and a preparation method of the catalyst. The catalyst comprises a magnesium-calcium-aluminum composite oxide and praseodymium sulfate, wherein mol ratios of all components in the terms of metallic elements are as follows: the mol ratio of Mg to Al is (1-3):1, the mol ratio of Mg to Ca is (5-20):1, and the mol ratio of Mg to Pr is (10-40):1. The preparation method comprises the following steps: preparing the magnesium-calcium-aluminum composite oxide according to a coprecipitation method, performing spray-soaking treatment on the magnesium-calcium-aluminum composite oxide by using a praseodymium sulfate solution, and drying and roasting to prepare a finished catalyst. According to the catalyst, when the selectivity of a target product isophorone is improved, the yield of the product isophorone is increased.

The invention discloses a high-efficiency composite dephosphorization agent and a preparation method thereof and belongs to the technical field of water disposal. The method comprises the steps of adding poly-aluminum chloride and an additive into a ferric trichloride solution, uniformly stirring the mixture, and adopting liquid alkali for adjusting the pH value of the solution to be 1-2.5 to obtain the high-efficiency composite dephosphorization agent, wherein the content of iron element in the high-efficiency composite dephosphorization agent is 11 wt.%, the molar ratio of the iron element to aluminum element is (2-7):(8-3), and the molar ratio of the additive to the sum of the iron element and the aluminum element is 0.02-0.15. The provided method has the advantages of simple operationand low cost; the high-efficiency composite dephosphorization agent prepared by means of the method is high in stability and has a good dephosphorization effect when applied to sewage disposal, and the chromaticity of water is low.