39results about How to "Reaction control is easy" patented technology

The invention discloses a gypsum drying and calcining machine which is characterized by comprising a drying part mechanism and a calcining part mechanism, wherein the drying part mechanism comprises a drying shell capable of being arranged rotatably, a plurality of lifting plates which can rotate along with the shell to drive materials to move forwards are obliquely arranged on the inner wall of the drying shell, a feeding mechanism is arranged at a feed end of the drying shell, and a heating air feed pipe for drying is arranged consequently in the drying shell; the calcining part mechanism comprises a calcining shell capable of being arranged rotatably, and a heating air feed pipe for calcining is arranged at a discharge end of the calcining shell; a vertically-arranged exhaust funnel is arranged between the discharge end of the drying shell and the feed end of the calcining shell, and an intermediate powder discharge shuttle tank and a rotatable transition shuttle tank are arranged in the exhaust funnel. The gypsum drying and calcining machine disclosed by the invention has the advantages of simple structure, capability of ensuring precise control of the reaction process and improving the reaction treatment effect, and capability of obtaining intermediate treatment product powder and higher product powder purity.

The invention provides a two-step synthetic method of a polyurethane modulus gradient material. The method is as below: first, using low molecular weight polyether glycol and aromatic diisocyanate as raw materials to synthesize an isocyanate terminated polyurethane prepolymer; and second, mixing the product with aromatic diisocyanate in different molar ratios, and then conducting ring trimerization reaction in the solvent under body condition, so as to finally obtain the polyurethane modulus gradient material. The synthetic method has the advantages that the first step has reaction stability and stable and controllable product quality, and the second step reaction system has low viscosity and even mixing, and is conducive to forming process of the material, and materials with different elastic modulus can be obtained by adjusting the molar ratio of the reactants. Different from the traditional polyurethane, the polyurethane modulus gradient material does not have obvious glass transition region, and shows gradual decrease of the elastic modulus with the increase of temperature.

The invention discloses a method for preparing amides by metallic sodium-catalyzed ester amination reaction: the reaction is carried out in an autoclave at 90-140°C with ester and liquid ammonia as raw materials and metallic sodium as a catalyst, ester:ammonia=1:1.2 The molar ratio of ~5.0, metal sodium is 4~10% of the molar weight of the ester; when the reaction pressure no longer drops, the reaction is stopped, the unreacted ammonia is recovered, and the obtained reaction product is post-processed to obtain the product. The method can efficiently prepare amides; and the raw materials are cheap, low in toxicity, high in reactivity, less in catalyst consumption, fast in reaction speed, high in reaction conversion rate, and easy to separate products.

The invention relates to the field of organic polymer chemistry, and specifically relates to a siloxane copolymer containing ethyl phenyl silica chain links and a preparation method thereof. The preparation method comprises the following steps: taking ethyl phenyl dialkoxysilane and dimethyl dialkoxysilane as the raw materials, carrying out hydrolysis condensation reactions in the presence of an anionic type or cationic type hydrolysis catalyst to generate oligomer composed of ethyl phenyl silica chain links and dimethyl silica chain links, then mixing the obtained oligomer with end-capping reagents with different structural types, carrying out reactions in the presence of an anionic type or cationic type polymerization catalyst, and subjecting the reaction products to neutralization/catalyst decomposition and reduced pressured distillation to remove low-boiling-point substances so as to obtain poly(dimethyl-ethylphenyl)siloxane copolymer with ends capped by different functional groups. The species of the monomer used in the provided method are few, the polymerization reaction conditions are mild, the reaction process control is simple, the copolymer structure is uniform, and the performance of the copolymer is excellent, and the provided method is suitable for massive industrial production.

The invention provides a synthesizing method of a hydroxyl-terminated liquid fluorine rubber modified polyurethane material with gradient modulus. The method comprises the steps that 1, polyether diol with a low molecular weight, hydroxyl-terminated liquid fluorine rubber and aromatic diisocyanate serve as the raw materials to synthesize an isocyanate-terminated modified polyurethane prepolymer; 2, the product in the first step is mixed with different mole ratios of aromatic diisocyanate, a cyclotrimerization reaction is conducted in a solvent in the ontological status, and the hydroxyl-terminated liquid fluorine rubber modified polyurethane material with the gradient modulus is obtained finally. The synthesizing method has the advantages that the reaction system is low in viscosity, and synthesis of the isocyanate-terminated polyurethane prepolymer is promoted; the method is novel, the reaction is easy to control, and the product is good and stable in quality. The obtained polyurethane material with the gradient modulus is good in toughness, temperature resistance and chemical medium resistance, and the elasticity modulus has gradualness along with changes of temperature.

Provided is a process for producing 13C, which is a non -radioactive stable isotope, by using a general-purpose hydrocarbon compound as the raw material without producing radioactive wastes. A process for the production of 13C, which is a non-radioactive stable isotope of carbon, by subjecting a raw material hydrocarbon compound to reaction in the presence of hydrogen, a sulfur compound, and a reaction catalyst at a temperature of 500 to 1000 DEG C, characterized in that the reaction catalyst is a sintered nickel compact or a sintered nickel alloy compact.

The invention discloses a preparation method of 5-chloro-8-hydroxyquinoline, aiming at solving the problems that when the 5-chloro-8-hydroxyquinoline is prepared by using 4-chloro-2-aminophenol, 4-chloro-2-nitrophenol and glycerol as raw materials and adopting a Skraup method in a loop closing way at present, sulfuric acid reacts violently with the glycerol in a process of dropwise adding the sulfuric acid so as to produce a large amount of acrolein, the acrolein self-polymerizes into tar, the tar is not only difficult to remove during the post-treatment of the product, but also reduces the reaction yield, the reaction process is difficult to control, and a great deal of waste acid is produced. According to the preparation method, hydrochloric acid is used as a solvent and the acrolein istaken as a loop closing raw material, so that the step of producing the acrolein by using the sulfuric acid and the glycerol is avoided, the generation of the tar is effectively reduced, and the heatrelease state of the reaction is controlled; furthermore, the problem that impurities are produced due to a sulfonation reaction of the product can be avoided, the product yield and safety are improved, the reaction is easy to control, and industrialization is easily realized; therefore, the preparation method has a higher application value.

The invention discloses a method for preparing a ternary precursor of a lithium battery by cyclic electrolysis. The method comprises the steps that (1) an active metal salt solution is mixed with an anion polymerization agent to acquire an electrolyte; (2) the electrolyte is electrolyzed through three-chamber membrane electrolysis reaction; and (3) an acid-soluble nickel-cobalt-manganese mixture is mixed with an acid solution acquired by electrolysis in the step (2) to acquire a mixed liquid; and the mixed liquid is added to an alkali chamber during electrolysis, and stirring and mixing are carried out at a rate of 50 to 300 r/min; and (4) the product acquired in the alkali chamber in the step (3) is filtered, and the solid phase product is washed, and then dried under vacuum at 60 to 120DEG C until the water content in the solid phase product is 0.1 to 0.5%, so as to acquire the lithium battery ternary precursor. According to the invention, in the reaction process adding an additional addition agent, an antioxidant, a dispersant and the like is not needed, so that the reaction control is greatly simplified, and the production cost is reduced; and the prepared ternary precursor have better performance indexes than a conventional coprecipitation method.

The invention relates to the technical field of organic silicon resin, and discloses a core-shell structure organic silicon resin preparation method, and the method comprises: S1, sequentially treating the surface of silicon dioxide through a vinyl-containing silane coupling agent and polymethyl methacrylate to obtain modified silicon dioxide; S2, adding the modified silicon dioxide in the S1 and an anhydrous solvent into a reactor, then adding a polysiloxane prepolymer, a platinum catalyst and hydrogen-containing polysiloxane for reaction, and after the reaction is finished, obtaining the organic silicon resin with the core-shell structure. By adopting the preparation method disclosed by the invention, polycondensation in subsequent use procedures can be effectively avoided, and meanwhile, the organic silicon resin prepared by adopting a segmented polymerization method has good compatibility with a resin matrix and is convenient to disperse.

The invention relates to a dimethyl cysteamine hydrochloride synthetic process. The dimethyl cysteamine hydrochloride is synthesized by taking isobutyraldehyde as an initial raw material through reactions of condensation, reduction, ring opening and ring closing, and ring opening. The process has the beneficial effects as follows: by replacing ammonia gas with ammonium hydroxide in a condensation reaction, and by directly putting a sodium borohydride solution from a place below a liquid surface to a reaction system in a reduction reaction, the reaction efficiency is improved; in the ring-opening reaction, phenylhydrazine is reserved as a ring-opening reagent; a ring-opening product is subjected to ring closing again in a system without performing separation; and then the product after being subjected to ring closing is rectified and purified, and is subjected to ring opening in an acidic condition to obtain a target compound, so that residual amount of a toxic substance which refers to phenylhydrazine is greatly reduced.

The invention provides a process for synthesizing 3-methylanisole through gas phase synthesizing, wherein the catalyst employs activated charcoal or molecular sieve or activated alumina, preferably the catalyst through solution treating of the alkaline metal or the alkaline earth fluoride or hydroxide compound. The preparation process comprises the steps of, preparing the disposed substance in solution of certain concentration, charging catalyst when stirring, dipping, drying and forming. The invention can realize high yield and selectivity for p-methylanisole.

The invention discloses an ion bridging salt-tolerant polymer thickening agent as well as a preparation method and application thereof, belongs to the technical field of preparation of polymer thickening agents, and aims to solve the technical problems that fracturing fluid which is just prepared before a cross-linking agent is injected is too high in viscosity and difficult to inject. The preparation method comprises the following steps: mixing maleic anhydride and initiators azodiisobutyronitrile and dimethylformamide, then adding acrylamide for reaction, and after the reaction is completed, carrying out reduced pressure distillation to remove a solvent, thereby obtaining the ion-bridged salt-tolerant polymer thickening agent. Before the ion bridging salt-tolerant polymer thickening agent is injected into a stratum with sand, maleic anhydride is partially hydrolyzed, intramolecular winding is caused by the disadvantage of the distance between molecules, the viscosity is reduced, and injection is convenient; meanwhile, the stratum water contains divalent ions such as Ca < 2 + > and Mg < 2 + >, metal ions are captured through ortho-position carboxyl, complexing, bridging and crosslinking are carried out, the rigidity of a molecular main chain is increased, and the side effect of the metal ions is reduced. The temperature resistance and the salt resistance of the thickening agent can be obviously improved.

The invention relates to removal of calcium and magnesium ions of concentrated liquor in a urban refuse landfill by virtue of a multiple precipitation method. The agent added into the concentrated liquor is ammonium phosphate and sodium hydroxide, and ammonia dissociated from ammonium phosphate serves as a ligand substance of a precipitate. The adding quantity is 500-2000 ppm and the accurate value of the added quantity is determined according to the actual content of the calcium and magnesium ions in the waste water. To add sodium hydroxide is to maintain the pH value of a mixed liquid at about 8, and the input quantity is determined according to the pH value of the wastewater. The removal provided by the invention has the advantages of being small in mud output and high in reliability. As the precipitate product of the concentrated liquor in the treatment process can be prevented from returning into a percolate treatment system as being finally solidified and buried, a metal hydroxide precipitation method and a metal carbonate precipitation method which are relatively large in mud output are not suitable for treatment of the concentrated liquor.

The invention discloses a method for preparing a flame-retardant polymer containing pyridine groups. The method comprises the following steps of (1) adding styrene, acrylonitrile, 2-vinyl pyridine, dibromostyrene and an emulsifier into a dispersant and stirring to obtain an emulsion; (2) adding an initiator and a chain transfer agent into the emulsion and reacting, wherein a reaction mixture is obtained after the reaction is completed; (3) adding a demulsifying agent into the reaction mixture, fully stirring and carrying out solid-liquid separation to obtain a solid product which is a crude product, and (4) sequentially washing the solid product with water and methanol, and after the washing is completed, drying to obtain the finished product. The product prepared by the method has the advantages of good flame-retardant property, good thermodynamic stability and strong surface adhesion force and has a wide range of application.