30 results about "Autocatalytic reaction" patented technology

The invention discloses a process for preparing dichloropropanol by an autocatalytic reaction of glycerol and hydrogen chloride. The process comprises the following steps: the glycerol and the hydrogen chloride gas perform the autocatalytic reaction at the temperature of between 105 and 160 DEG C and pressure of between 0.05 and 0.5MPa, and generated water is distilled and removed during the reaction. The invention also discloses a system for preparing the dichloropropanol by the autocatalytic reaction of the glycerol and the hydrogen chloride. The invention adopts the technology of the autocatalytic reaction of the glycerol and the hydrogen chloride without using a catalyst, so that the production cost is remarkably reduced, formation of high boiling side products is eliminated, and the reaction selectivity is improved. The invention has the advantages of simple process and low production cost. The system can ensure that the glycerol is completely converted and greatly improves the selectivity of the dichloropropanol, so that the purity of the finally prepared dichloropropanol is more than 99.5 percent.

The invention discloses a preparation method for metal-ceramic composite powder of a core-shell structure. The preparation method comprises the following step (1) of performing catalytic activation treatment to ceramic powder particles, placing the ceramic powder particles in a reactor, and heating reactive materials; using carrier gas for carrying reactive material steam to enter the reactor, andadding hydrogen gas for reduction reaction, so that catalytic metal is deposited on the surface of the ceramic powder particles; the step (2) of placing the ceramic powder particles obtained in the step (1) in the reactor in a water bath, and adding metal salt raw material and reducing agents; and forming a metal coating through autocatalytic reaction, and obtaining the metal-ceramic composite powder. According to the preparation method, the procedures of coarsening, sensitization and reactivation in a traditional chemical metal coating process are omitted, and expensive palladium chloride catalysts are not required; the introduction of impurity palladium is avoided, and the metal coating is achieved at lower temperature; the metal content of the coating is controllable, and the overall coating technology is simple, and the preparation method is applied to industrial mass production.

The invention discloses a dissolving pulp prehydrolysis solution autocatalysis furfuraldehyde preparation method and a recycling method for acetic acid in prehydrolysis solution waste water and furfuraldehyde waste water after prehydrolysis solution autocatalysis furfuraldehyde preparation. The dissolving pulp prehydrolysis solution autocatalysis furfuraldehyde preparation method includes that dissolving pulp prehydrolysis solution for preparing furfuraldehyde comprises dissolving pulp prehydrolysis solution A, dissolving pulp prehydrolysis solution B from which lignin is eliminated, dissolving pulp prehydrolysis solution C which is evaporated and concentrated and dissolving pulp prehydrolysis solution D which is subjected to membrane filtration and concentration; and the prehydrolysis solutions are placed in high-pressure reactors respectively, catalysts such as sulfuric acid, hydrochloric acid or acetic acid is not required to be added for autocatalysis reaction, during the reaction, pentosan is hydrolyzed into pentose, and the pentose is dehydrated and cyclized to obtain the furfuraldehyde. The acetic acid in the prehydrolysis solution waste water and the furfuraldehyde waste water after prehydrolysis solution autocatalysis furfuraldehyde preparation is recycled through a trioctylamine / n-caprylic alcohol mixture or resin. The methods are practical and operable, and the preparation method is an environmental-friendly preparation method which can turn waste into wealth.

Radiation-activated catalysts (RACs), autocatalytic reactions, and protective groups are employed to achieve a highly sensitive, high resolution, radiation directed combinatorial synthesis of pattern arrays of diverse polymers. When irradiated, RACs produce catalysts that can react with enhancers, such as those involved in autocatalytic reactions. The autocatalytic reactions produce at least one product that removes protecting groups from synthesis intermediates. This invention has a wide variety of applications and is particularly useful for the solid phase combinatorial synthesis of polymers.

The invention discloses a process for preparing dichloropropanol by an autocatalytic reaction of glycerol and hydrogen chloride. The process comprises the following steps: the glycerol and the hydrogen chloride gas perform the autocatalytic reaction at the temperature of between 105 and 160 DEG C and pressure of between 0.05 and 0.5MPa, and generated water is distilled and removed during the reaction. The invention also discloses a system for preparing the dichloropropanol by the autocatalytic reaction of the glycerol and the hydrogen chloride. The invention adopts the technology of the autocatalytic reaction of the glycerol and the hydrogen chloride without using a catalyst, so that the production cost is remarkably reduced, formation of high boiling side products is eliminated, and the reaction selectivity is improved. The invention has the advantages of simple process and low production cost. The system can ensure that the glycerol is completely converted and greatly improves the selectivity of the dichloropropanol, so that the purity of the finally prepared dichloropropanol is more than 99.5 percent.

The invention provides a multilevel structure lithium sulfide / carbon composite material and a preparation method and application thereof.The preparation method comprises the steps that a lithium source, a metal salt solution and a graphene oxide solution are mixed and dried to obtain a precursor material, and the precursor material and organic compound powder are subjected to annealing treatment together to obtain the multilevel structure lithium sulfide / carbon composite material. And carrying out autocatalytic reaction and thermal reduction reaction under the annealing treatment condition to obtain the lithium sulfide / carbon composite material with the multilevel structure. The multilevel structure lithium sulfide / carbon composite material obtained by the preparation method disclosed by the invention can stabilize the structure and improve the conductivity through the composite action of the lithium sulfide, the reduced graphene oxide and the carbon hybrid nanotube, and meanwhile, can effectively relieve the volume change of the lithium sulfide / carbon composite material in the charging and discharging process, so that the performance of the lithium sulfide / carbon composite material is improved. And the material has excellent cyclic specific capacity and capacity retention ratio.

The invention provides a synthetic method of a key intermediate of efavirenz, comprising the following steps: reacting p-chloroaniline and pivaloyl chloride to protect the amino group to obtain N-(4-chlorophenyl)-2,2-dimethylpropane Amide; the above product and trifluoroacetic anhydride are hydrolyzed under acidic conditions to obtain 4-chloro-2-trifluoroacetylaniline hydrochloride after Friedel-Crafts acylation reaction under the action of aluminum trichloride; then through alkalization Obtain 4-chloro-2-trifluoroacetylaniline, and in the catalytic system that ligand (1R,2S)-1-phenyl-2-(1-pyrrolidinyl)-1-propanol forms with cyclopropyne Magnesium chloride reaction, the key intermediate of efavirenz was prepared through asymmetric autocatalytic reaction. The method for synthesizing the key intermediate of efavirenz provided by the present invention has cheap and easy-to-obtain raw materials, low toxicity of the reagents used, mild reaction conditions, no need for frequent amino protection and deprotection, simple route, and excellent reaction yields in each step , the total yield is high.

The invention discloses a method for preparing a metal-ceramic composite powder with a core-shell structure. The preparation method comprises the following steps: 1) Catalyzing and activating the ceramic powder particles: placing the ceramic powder particles in a reactor, heating The reaction raw material, using the carrier gas to carry the reaction raw material vapor into the reactor, passing through hydrogen gas to undergo a reduction reaction, so that the catalytic metal is deposited on the surface of the ceramic powder particles; 2) The reaction of placing the ceramic powder particles obtained in step 1) in a water bath Add metal salt raw materials and reducing agent to the device, and coat the metal coating layer through self-catalyzed reaction to obtain metal-ceramic composite powder. The present invention saves the roughening, sensitization and activation processes in the traditional electroless metal plating process, does not need to use expensive palladium chloride catalyst, avoids the introduction of impurity palladium, and realizes metal plating and cladding at a relatively low temperature. The metal content is controllable, the overall coating process is simple, and it is suitable for large-scale industrial production.

The present invention relates to a three-phase reactor for the reaction of a hydrocarbon feedstock with hydrogen and to a hydroconversion process, for example of H-Oil™ type, employing it, comprising a chamber with an upper end and a gas / liquid separation device comprising:a recycle cup, above the catalytic reaction zone and delimiting, with the upper end, a recycle zone, comprising a cylindrical upper part extended by a lower part of decreasing section and of variable angle of inclination, provided with vertical pipes for the passage of a gas / liquid mixture originating from a catalytic reaction zone, and having a fixed angle of inclination β of between 50° and 85° with respect to the axis of the cylindrical part,a pipe for recycle of the liquid at the apex of the lower part, in fluidic communication with the lower end of the chamber by recirculation means.

A technology capable of reducing contamination of a semiconductor substrate above which a nickel film is disposed is provided. A semiconductor device includes: a semiconductor substrate; an aluminum alloy film disposed on at least one of a front surface and a back surface of the semiconductor substrate; a catalyst metal film disposed above the aluminum alloy film and exhibiting catalytic activity for autocatalytic reaction that deposits nickel; an electroless nickel plating film disposed on the catalyst metal film; and a reactant layer disposed between the aluminum alloy film and the catalyst metal film and containing metal of the catalyst metal film.

The present invention proposes a continuous refining method and device for high-purity ε-caprolactone. The present invention proposes a continuous refining method for high-purity ε-caprolactone, using refined ε-caprolactone as raw material, Using multi-carbon alcohols as entraining agents, in the reactive distillation column, poly-carbon alcohols, polybasic acids, and hydroxycaproic acid undergo autocatalytic reactions to generate corresponding esters, thereby changing the difficulty of separation from ε-caprolactone, and The azeotropic property of water and polycarbonate alcohols can also effectively separate water and ε‑caprolactone. Effectively remove water, polyacids and hydroxycaproic acid from ε-caprolactone through reactive distillation-azeotropic distillation. This process is simple and easy to implement, and can realize continuous production of high-purity ε-caprolactone. The purity of the obtained ε-caprolactone is ≥99.95%, and the yield is ≥99%. Not only can the polycaprolactone produced by ε-caprolactone be used in the medical field, but also greatly improve the economic and social benefits of the enterprise.

A metal surface treatment device, according to the present invention, is a metal surface treatment device which carries out surface treatment for a target metal heated at a temperature for which surface treatment is possible, the device comprising: a reaction chamber which has a shape corresponding to an outer shape of the target metal and is arranged within a certain interval from the outer side of the target metal, and which accommodates at least a part of the target metal; and a raw gas supply unit for supplying raw gas which is necessary for an autocatalytic reaction with the target metal accommodated within the reaction chamber. Furthermore, a metal surface treatment method using the same comprises the steps of: positioning a target metal within the reaction chamber, which has the shape corresponding to the outer form of the target metal and is arranged within a certain interval from the outer side of the target metal and which accommodates at least a part of the target metal; and forming a raw gas layer in the target metal through an autocatalytic reaction by supplying raw gas to the inside of the reaction chamber through the raw gas supply unit.