52results about How to "Reduce the amount of decomposition" patented technology

The invention relates to a catalyst combination used for propylene hydrogen formylation reaction, comprising the components: rhodium, bis-phosphite and single-phosphite. The effects that the activation of Rh / phosphite catalyst is kept and the normal / isomeric ratio of outcome butyraldehyde is suitably adjusted are achieved by adding single-phosphite or bis-phosphite in the propylene hydrogen formylation reaction system catalyzed by the phosphite / Rh; furthermore, highe normal / isomeric ratio and reaction rate are still remained on the basis that the dosage of bis-phosphite is reduced and sub-pressure CO: H2 is more than 1.

The invention discloses a method for preparing graphene through chemical vapor deposition under a cold cavity wall condition. The method comprises the following detailed steps of: 1) placing a substrate in a sealed cavity with circulating water cooling, wherein the temperature of the cavity wall is controlled to be between the room temperature and 100 DEG C; 2) introducing carrier gas and heatingthe substrate; 3) continuously introducing carbon source-containing gas for 5 to 30 seconds; and 4) after cooling the substrate, generating the grapheme on the surface of the substrate. When the coldcavity wall chemical vapor deposition is compared with the traditional widely used hot cavity wall chemical vapor deposition, the heated area is only limited to the substrate and the other parts of the cavity are cooled, so that the decomposition of the carbon source-containing gas can be reduced, the growing thickness of the grapheme is precisely controlled, and carbon can deposit on the surfaceof the substrate in a form of a single atom layer to generate the single-layer grapheme. The grapheme prepared by the method has the advantages of good uniformity, large area, few defects, excellent electricity conductivity, good mechanical properties and the like.

The invention discloses a continuous sampling apparatus and a continuous sampling method for a marine natural gas hydrate. The continuous sampling apparatus comprises refrigeration equipment, a single-action rotation sampling drilling tool, a high-pressure plunger pump, air compression equipment, nitrogen production equipment, a thermal insulation and pressure retention separation device and a thermal insulation and pressure retention ore box, wherein the refrigeration equipment, the single-action rotation sampling drilling tool, the high-pressure plunger pump, the air compression equipment, the nitrogen production equipment, the thermal insulation and pressure retention separation device and the thermal insulation and pressure retention ore box are connected through pipelines, and are sequentially fixed on an exploration ship, and the single-action rotation sampling drilling tool contacts a marine natural gas hydrate stratum. According to the present invention, the high-pressure low-temperature jet flow is used as the cutting tool to drill into the stratum, the broken hydrate blocks are transported to the sea surface thermal insulation and pressure retention bin through the hydraulic lifting mode, the continuous core sampling can be achieved according to the self-protection effect, the hydrate decomposition caused by the frictional heat generation of the drilling bit can be effectively reduced, and the anti-circulation channel can be in the low temperature environment.

The invention provides a new method for leaching gold by thiosulfate through cobalt and ammonia catalysis. The cobalt and ammonia catalysis is adopted to replace traditional copper and ammonia catalysis, that is, cobalt sulfate is added in thiosulfate gold leaching pulp to replace the adding of copper sulfate. As the thiosulfate method has such advantages as gold leaching in an alkaline medium, no poison of a leaching agent and low cost, the thiosulfate method is extensively considered as a most growable non-cyaniding gold leaching method. However, a traditional thiosulfate gold leaching method has the problem of high leaching agent consumption, and badly hinders the industrial application. The method eliminates the oxygenolysis effect of Cu(NH3)4<2+> on S2O3<2->, can prominently reduce the consumption of thiosulfate, and has equivalent gold leaching rate compared with the copper and ammonia catalysis. The method is helpful to promote industrial application of gold leaching by the thiosulfate method.

The invention discloses a seabed superficial hydrate exploiting apparatus and an exploiting method thereof and relates to the technical field of unconventional oil-gas reservoir development engineering. A seabed mining vehicle is controlled from a vessel; the seabed mining vehicle exploits hydrates and deposit from the seabed, discharges water and performs crushing; the seabed mining vehicle is then lifted to the seawater superficial layer for heating. The seabed superficial hydrate exploiting apparatus and the exploiting method thereof have the advantages that hydrates are decomposed in a hydrate decomposition station in the seawater superficial layer, the superficial layer close to the sea level features low pressure and high temperature as compared to the seabed environment and has theunique temperature and pressure conditions for the decomposition of hydrates, and auxiliary heat is supplied to promote decomposition rate of the hydrates; the apparatus herein has the modules, such as a seabed self-traveling functional module and a multi-angle multi-directional exploiting technique module; the decomposed hydrate deposit is backfilled to a gob, geological disasters, such as landslide, can be effectively avoided, single-line operation speed is high, operation time is short, and the influence of hydrate decomposition upon the marine environment and marine lives is effectively avoided.

The invention relates to a preparation method of a large-sized solid wood composite board. The preparation method comprises the following steps that a dried solid wood large board is stamped into small wood strips with the same thickness and the same or similar width; the small wood strips are made into equal-length wood strips with the same length, and surface treatment is conducted; the equal-length wood strips are transversely spliced into a large-sized wide board; a surface material is compounded on the combined and machined large-sized wide board, specialized putty is adopted as a coatingmaterial adopted in the compounding process, a coating layer is formed on a surface layer of the large-sized wide board through the specialized putty, and drying and curing are conducted after compounding; and lastly, double-faced sanding operation and flushing construction are conducted, and a finished product is prepared. According to the preparation method and the prepared solid wood compositeboard, the defects that in an existing solid wood large board and other machining modes, deformation is prone to occurring, and the outturn percentage is low are overcome, new functions brought by the surface material are highlighted after the deformation problem is solved, and the solid wood-based new material machining and applying new view is achieved.

The invention discloses a method for preparing a foamed aluminum alloy special-shaped piece with a uniform pore structure, which comprises the following steps: the first step: heating the aluminum alloy to melt, adding titanium hydride, stirring to disperse the titanium hydride, and then adding calcium to aluminum In the molten alloy, stir to increase the viscosity of the melt, cool the stirred melt to obtain a preform; the second step: put the above preform into the mold, heat it up, and keep it warm at this temperature, The primary foamed aluminum alloy prefabricated part is made into secondary foam in the mould, and the foamed aluminum alloy is cooled to obtain a foamed aluminum alloy product. In the second step, before the secondary foaming is heated up, the primary foamed aluminum alloy prefabricated part and the mold are preheated and kept warm. In the present invention, titanium hydride is added before the tackifier calcium is added, and the viscosity of the aluminum alloy melt is low, which is conducive to the uniform dispersion of titanium hydride in the aluminum alloy melt in a relatively short period of time, and is conducive to the preparation of a uniform pore structure. Dimensional foam aluminum alloy profiled parts.

The invention discloses a method for improving the oxidation yield of the hydrogenated liquid of hydrogen peroxide prepared by utilizing an ananthraquinone process. In the oxidation process, an acid solution entering an oxidation tower is prepared by completely or partially replacing phosphoric acid with organic acid. A composite acid solution comprises the following components by mass: 2% to 30% of the organic acid, 0% to 40% of the phosphoric acid and the balance of water. The composite acid solution is mixed with the hydrogenated liquid at a volume ratio of 1:(2-10)*10<4>. According to the method, the oxidation yield of the hydrogenated liquid can be improved by more than 4%; the discharge quantity of a residual oxidation liquid is reduced by more than 4%; and the stability of H2O2 (hydrogen peroxide) in the residual oxidation liquid is improved from 43% to more than 82%. As a result, based on the improvement in the stability of the residual oxidation liquid and the reduction in the discharge of the residual oxidation liquid, the safety of oxidation equipment is enhanced.

The invention relates to a high-strength water-based phenolic resin and a preparation method thereof, and belongs to the technical field of phenolic resins. The phenolic resin comprises the following raw materials by weight: 160 parts of phenol, 400 parts of a formaldehyde solution, 2.4 parts of liquid caustic soda, 0.5 part of caustic soda flakes, 10 parts of triethylamine, 5 parts of dimethylethanolamine, 5 parts of N-methylethanolamine, 2 parts of sodium carbonate, 250 parts of urea, 190 parts of water, and 20-40 parts of an additive. The water-based phenolic resin is generated by reaction of phenol and formaldehyde under alkaline conditions, and has the characteristics of no solid waste, no wastewater, no smoke and the like. The additive is added in the preparation process, so that the phenolic resin forms a heterocyclic structure with higher thermal stability, the aromaticity of the resin is improved, the decomposition amount of the resin at high temperature is reduced, and the flame retardant property is improved. The prepared water-based phenolic resin is good in comprehensive performance and low in toxicity; and the product is low in free aldehyde content and good in adhesive property.

The invention provides a device for bleaching a nitric acid solution through a urea method and a preparation method therefor. The device comprises an acid preparation tank and a urea storage tank, wherein the acid preparation tank is connected with the urea storage tank through a communicating pipe; the top end of the acid preparation tank is connected with one inlet end of an ejector through a nitrogen dioxide pipe, the other inlet end of the ejector is connected with the urea storage tank, and the outlet end of the ejector is connected with a liquid distributor horizontally arranged inside the acid preparation tank through a urea pipe; and the outlet of the urea storage tank is connected with the urea pipe and the ejector respectively through a circulating conveying pump. Under micro negative pressure, NO2 in nitric acid and a urea solution both enter the ejector for reaction, and enter the acid preparation tank together with the urea solution to react with carbon dioxide generated later. Long-acting colorlessness of the nitric acid solution can be realized for a long time, so that the content of carbon dioxide in the acid preparation tank is quickly controlled, and the content overstandard problem of nitrogen dioxide is solved.

The invention provides a reaction tower with reaction shallow pools and a method for preparing ethylene carbonate by using the reaction tower. The reaction tower comprises a tower body and a stirrer, the interior of the tower body is divided into an upper reaction area and a tower kettle reaction area, a plurality of stages of reaction shallow pools are arranged in the upper reaction area from top to bottom and are used for realizing graded reaction, and a liquid collecting ring is arranged above each stage of reaction shallow pool and is used for collecting condensate; and the stirrer is used for stirring the reaction liquid in the tower body. The reaction tower for preparing ethylene carbonate has the advantages of being feasible, energy-saving, efficient, high in urea conversion rate, small in ethylene glycol polymerization amount, small in ethylene carbonate decomposition amount, high in yield and the like.

The invention relates to a method for a gas-phase epoxidation reaction of olefin and hydroperoxide. The method comprises the following steps: a, proportioning raw materials; b, preheating and gasifying olefin; c, spraying a hydroperoxide raw material to the gasified gas-phase olefin to form a gas-liquid mixture flow; d, increasing the temperature of the gas-liquid mixture flow, and completely gasifying the gas-liquid mixture flow to form a gas-phase epoxidation reaction flow; e, carrying out an epoxidation reaction in the presence of an epoxidation catalyst to form an epoxide discharged material; and transferring heat released by the epoxidation reaction; and f, carrying out heat exchange on the epoxide discharge material and the gas-liquid mixture flow in the step d, and then leaving theepoxidation reaction system to carry out a subsequent process to obtain epoxypropane. According to the method, a set of rapid and high-temperature reaction circulation process is formed, the decomposition amount of the raw materials is reduced, the reaction rate and conversion rate are increased, and meanwhile, the economy of the epoxidation reaction is improved.

The invention discloses a continuous sampling apparatus and a continuous sampling method for a marine natural gas hydrate. The continuous sampling apparatus comprises refrigeration equipment, a single-action rotation sampling drilling tool, a high-pressure plunger pump, air compression equipment, nitrogen production equipment, a thermal insulation and pressure retention separation device and a thermal insulation and pressure retention ore box, wherein the refrigeration equipment, the single-action rotation sampling drilling tool, the high-pressure plunger pump, the air compression equipment, the nitrogen production equipment, the thermal insulation and pressure retention separation device and the thermal insulation and pressure retention ore box are connected through pipelines, and are sequentially fixed on an exploration ship, and the single-action rotation sampling drilling tool contacts a marine natural gas hydrate stratum. According to the present invention, the high-pressure low-temperature jet flow is used as the cutting tool to drill into the stratum, the broken hydrate blocks are transported to the sea surface thermal insulation and pressure retention bin through the hydraulic lifting mode, the continuous core sampling can be achieved according to the self-protection effect, the hydrate decomposition caused by the frictional heat generation of the drilling bit can be effectively reduced, and the anti-circulation channel can be in the low temperature environment.

The invention provides a device for bleaching a nitric acid solution through a urea method and a preparation method therefor. The device comprises an acid preparation tank and a urea storage tank, wherein the acid preparation tank is connected with the urea storage tank through a communicating pipe; the top end of the acid preparation tank is connected with one inlet end of an ejector through a nitrogen dioxide pipe, the other inlet end of the ejector is connected with the urea storage tank, and the outlet end of the ejector is connected with a liquid distributor horizontally arranged inside the acid preparation tank through a urea pipe; and the outlet of the urea storage tank is connected with the urea pipe and the ejector respectively through a circulating conveying pump. Under micro negative pressure, NO2 in nitric acid and a urea solution both enter the ejector for reaction, and enter the acid preparation tank together with the urea solution to react with carbon dioxide generated later. Long-acting colorlessness of the nitric acid solution can be realized for a long time, so that the content of carbon dioxide in the acid preparation tank is quickly controlled, and the content overstandard problem of nitrogen dioxide is solved.

The invention discloses a preparation method of silver-coated copper powder, and relates to the technical field of advanced electronic materials. The preparation method of a silver-coated copper powder provided by the present invention uses the silver ion complexing agent in the replacement chemical treatment solution to complex the silver ion to reduce the concentration of silver ions on the surface of the copper powder, and at the same time, the copper ion complexing agent makes it easier for the copper ion to discharge uniformly , promote the uniform deposition of silver atoms on the surface of copper powder, and the silver ion complexing agent and copper ion complexing agent produce a synergistic effect, thereby improving the complexation efficiency of silver ions and copper ions on the surface of copper powder, and further improving the deposition of silver atoms on the surface of copper powder. The deposition rate of the silver-coated copper powder can be quickly formed and evenly covered on the surface of the copper powder. Surface silver effect and technical effect of silver quality.

The invention discloses a method and system for continuous production of nitrosyl sulfuric acid. The method for continuous production of nitrosyl sulfuric acid comprises the following steps: sulfuric acid, water and nitric acid are continuously pumped into an acid mixing tank to obtain mixed acid, mixed acid And liquid sulfur dioxide is continuously pumped into the high gravity reactor for reaction, and finally the nitrosyl sulfuric acid product is obtained. The present invention can accurately control the amount of materials, enhance the mass transfer effect, shorten the reaction time, shorten the average residence time of materials in the reaction cycle system, reduce the loss of raw materials, reduce production costs, and the system does not produce tail gas, green Environmental friendly.