125 results about "Microwave chemistry" patented technology

The present invention concerns a novel means by which chemical preparations can be made. Reactions can be accelerated on special chips using microwave energy. The chips contain materials that efficiently absorb microwave energy causing chemical reaction rate increases. The invention is important in many small scale chemical transformations including those used in protein chemistry and in combinatorial chemistry.

The present invention concerns a novel means by which specific chosen reactions can be accelerated through the use of a new type of artificial enzyme. The invention allows specific reactions to occur at an accelerated rate, even in the presence of other non-chosen molecules, which may be very similar in structure to the chosen reactant. The reactions may be stoichiometric or catalytic.

This invention relates to a field of pharmaceutical chemistry, relates to a process of extracting high water soluble polysaccharides from higher plants or fungi. The present invention discloses a process of extracting higher plants and fungi polysaccharides based on a microwave chemistry method, comprising: putting the residue or pulverized higher plants and fungi after being degreased by an organic solvent into a microwave reaction chamber to react with an acid solution; and then distilling to remove excess acid or washing with organic solvent to remove the acid; adding water solution for extraction, subjecting the extracting solution after concentration to alcohol precipitation, separating precipitates aka polysaccharides therefrom.

The present invention has significant advantages like fast processing rate, high polysaccharides yield, low organic acid consumption and efficient and easy to recycle, low water consumption, low power consumption, etc., and obtained polysaccharides have high yield and purity, good water solubility, and good biological activity.

The invention belongs to the field of modern isolation analysis materials science and engineering, it relates to preparation method and application of microwave assistant molecular print magnetic microsphere, the procedure as follows: adopting microwave chemical reactor, taking nanometer magnetic fluid as magnetic nuclei, by cleaning and external modification, ultrasound detracting to water; mounted pattern molecule and functional monomer self-assembly; adding polymeric liquor by step, cross link agent and initiator, making it mixes and separates with magnetic fluid fully by stirring of machine, microwave procedure controlled temperature and heats up, until raising polymerization; Magnetic separates the foregoing magnetic microsphere, removing mounted pattern molecule, vacuum drying, aging. The molecular print magnetic microsphere has not only recognize ability of mounted pattern molecule and its analogue, but also has the approved characteristic of 'gathering hyphen recycle', the process of preparation heats up with microwave, decreasing the time of print aggregation, improving homogeneity and print efficiency of polymer form. The molecular print magnetic sphere applies to gather, isolate and analysis of structure analogue in the environmental sample, eatable etc complex samples.

The present invention relates to a microwave chemical reaction apparatus characterized by comprising a means for heating a reaction liquid, which is capable of irradiating microwaves while controlling the output power according to the temperature of the reaction liquid, together with a means for forcibly cooling the reaction liquid from the outside, and being capable of precisely controlling the reaction temperature. The microwave chemical reaction apparatus can control the reaction temperature precisely, for example, within ±1° C. of a predetermined temperature, and can be applied to fine chemical reactions. Further, since reactions proceed rapidly in such an apparatus, mass production can be achieved by a relatively small-sized reaction apparatus.

The invention provides a device and method for preparing an activated carbon material for an electrochemical capacitor, belonging to the technical fields of coal chemical industry and microwave chemistry. The method comprises the following preparation processes of: deashing coal particles serving as raw materials by using hydrochloric acid and hydrofluoric acid, modifying the deashed coal by using nitric acid in an auxiliary way, mixing the modified coal serving as a carbon source with potassium hydroxide and deionized water, stirring to obtain a mixture, stirring and evaporating the mixture to obtain a solid mixture, and then performing microwave-assisted activating, washing, drying and grinding on the solid mixture to obtain the activated carbon. The invention has the advantages that the activation time is only 20-30 minutes, the mass ratio of potassium hydroxide to coal is (0.5-3):1, the preparation process is simple, the microwave-assisted heating is uniform, efficient and energy-saving, the consumption of the potassium hydroxide is reduced, and the activation process has the advantages of uniformity and high efficiency. The prepared activated carbon is used as an electrode material of the electrochemical capacitor and has better stability and excellent comprehensive property.

The invention discloses a preparation method of a zinc oxide nanosphere which fills a gap of the prior art on a zinc oxide microsphere/ nanosphere. In the invention, the zinc oxide nanosphere is prepared by adopting a microwave chemical hydrothermal synthesis method, that is to say, the zinc oxide nanosphere is prepared by using an aqueous solution of simple zinc sources, such as zinc acetate, and the like and trolamine as a precursor solution through a microwave irradiation process. The preparation method of the zinc oxide nanosphere does not use any templates, additives and organic solvents, has a clean process, friendly environment, lower reaction temperature, and shorter reaction time, and microwave irradiation for 10 minutes at the temperature of 60 DEG C is enough, thereby saving energy sources with simplicity and high efficiency. The zinc oxide nanosphere product has even size distribution with the nanosphere diameter of 250-400nm, monodispersity, high production rate and low cost and is suitable for industrial production, and raw materials are easy to obtain.

The invention discloses a method for preparing a mesoporous carbon material for an electrochemical capacitor by using rice hulls as raw materials, and belongs to the technical field of carbon materials and microwave chemistry. The method comprises the following steps of: activating the hulls serving as a carbon source by using zinc chloride serving as an activating agent through microwave auxiliary heating to obtain the mesoporous carbon material in one step, wherein the specific surface area of the obtained mesoporous carbon material is between 1,409 and 1,738m<2>/g, the total pore volume is between 0.71 and 2.14cm<3>/g, the average pore size is between 1.99 and 6.08nm, the ratio of the volume of a non-micro pore to the total pore volume is between 66.2 and 99.5 percent, and the mesoporous carbon yield is between 30.4 and 37.0 percent. The method for preparing the mesoporous carbon material is simple, efficient and energy-saving; and the prepared mesoporous carbon material has a higher ratio of the volume of the non-micro pore to the total pore volume, and has extremely high quick charging and discharging performance when used as an electrode material of the electrochemical capacitor.

This invention relates to an extraction process of brown algae polysaccharides in a field of pharmaceutical chemistry. This invention particularly discloses a process of extracting brown algae polysaccharides based on a microwave chemistry method and brown algae polysaccharides obtained by said process. The process of the invention comprises: 1) putting pulverized brown algae powder into a microwave reaction chamber, adding acid solution to conduct reaction; optionally concentrating the mixer, and then washing with organic solvent to remove excess acid; conducting grading alcohol precipitation after water extract to obtain mannuronic acid rich fragment (M rich) algin, fucoidan and/or laminaran respectively; and adding an alkali solution to the brown algae residue to conduct alkaline digestion, filtering the residue off, adjusting pH of the filtrate to neutral, conducting alcohol precipitation to obtain guluronic acid rich fragment (G rich) algin precipitates. The present invention has significant advantages like fast processing rate, high yield of polysaccharides, strong controllable polysaccharide degradation, using less organic acid and efficient recovery, small water consumption, low power consumption, etc., the active polysaccharides has high yield and content, better water-soluble, and good biological activities.

The invention discloses a self-relieving chemical reaction kettle capable of being suitable for microwave working environment, belonging to the field of analytical instruments. The self-relieving chemical reaction kettle comprises a sleeve and a sample dissolving cup, and is characterized in that a sealing cover is arranged at the top of the sleeve, an exhaust cavity is arranged inside the sealing cover, a plurality of exhaust holes are formed in the top surface of the sealing cover, a first detachable connecting structure is arranged between the lower end of the sealing cover and the top of the sleeve, a sealing plug with a center pressure guiding hole is arranged at the upper end of the sample dissolving cup, the sealing plug is arranged between the top of the sample dissolving cup and the lower end of the sealing cover, a relieving module is arranged at the upper end of the sealing cover; the relieving module comprises a choke plug, a spring casing, a movable block, a spring and a cap which are sequentially arranged; the choke plug is of an inverted U-shaped structure with an upward opening and an inner cavity, and the spring casing, the movable block, the spring and the cap are sequentially sleeved in the inner cavity of the choke plug. Through arranging the sealing plug and the relieving module, the self-relieving function of a digestion tank is realized; the self-relieving chemical reaction kettle can be widely applied to the fields of design and manufacture of microwave chemical digestion equipment.

A visual high-pressure microwave heating chemical reactor is composed of microwave generating/controlling/transmitting system, chemical reactor, constant-temp system and reactive gas I/O and metering system. Said chemical reactor consists of stainless steel jacket, protecting stainless steel rings, high pressure resistant glass cylinder, high pressure resistant microwave guide and enclosing head.

The invention provides a microwave chemical reaction device using a dielectric radiator, which comprises a reaction vessel and a microwave energy transmission system. The microwave energy transmission system comprises the dielectric radiator and a wave guide, wherein the dielectric radiator passes through the wall of the reaction vessel and extends into the reaction vessel; and the dielectric radiator is connected with a microwave source through the wave guide. The number of the microwave energy transmission systems is determined by the power and volume of the microwave chemical reaction device; for the microwave chemical reaction device with small power and volume, the microwave energy transmission systems can be one set or two sets, and for the microwave chemical reaction device with large power and volume, a plurality of independent microwave energy transmission systems can be arranged. When the microwave energy transmission systems are more than two sets, the position of the dielectric radiator in each set of the microwave energy transmission system in the reaction vessel can make energy coupling of the dielectric radiator and the other dielectric radiators in all microwave energy transmission systems be less than or equal to -10 dB.

The invention relates to a microwave chemical reactor suitable for various laboratories. By modifying a household microwave oven, the reactor mainly comprises two parts, namely a measurement and control part for various parameters, and a power supply instrument part of a chemical reactor and the microwave chemical reactor. The microwave chemical reactor has the following performance: power is continuously adjustable; different levels of constant power is output; constant temperature is controlled; a mechanical agitator can adjust the speed and display the stirring speed; the microwave power is displayed, energy in the furnace chamber of the microwave oven is evenly distributed, and all the parameters in the reaction process are sampled and recorded by a computer.

The invention belongs to the field of heave metal waste water, and particularly relates to a method for efficiently reducing hexavalent chromium in water by magnetic electric conduction macromolecule synergistic microwave. The method comprises the following steps that: regulating waste water which contains the hexavalent chromium by inorganic acid or small molecular organic acid to obtain solution of which the pH (Potential of Hydrogen) is acidic; adding a magnetic electric conduction macromolecule material of a nuclear shell structure; after even mixing, transferring to a microwave chemical reactor to react, reducing the hexavalent chromium in the waste water into trivalent chromium, and then, carrying out separation and recovery on the magnetic electric conduction macromolecule material by a permanent magnet; utilizing the magnetic electric conduction macromolecule to effectively adsorb the surface enrichment of the hexavalent chromium and microwave energy, and realizing the efficient reduction of the high-toxicity hexavalent chromium in a microwave field. Compared with other technologies, the method has an obvious kinetic advantage; the regeneration of the magnetic electric conduction macromolecule can be realized by the microwave, and a magnetic separation and recovery material can be recycled. The method is simple, efficient and easy in industrialization and has an obvious economic and environment benefit.

The invention relates to a sewage processing method and system by the microwave chemistry. Before the sewage is transmitted to a microwave reactor (9), a microwave senstizer, which has a higher sensitivity degree to the microwave, is added into the sewage. The senstizer improves the penetration capability and catalysis action of the microwave during the sewage treatment process, reduces the size of the sewage treatment equipment and promotes the sewage treatment efficiency.

The invention discloses a constant temperature control system for a microwave chemical reactor. The constant temperature control system comprises a microprocessor control module, wherein the microprocessor control module is connected with a bidirectional silicon-controlled rectifier and a temperature sensor; the bidirectional silicon-controlled rectifier is connected with a 220V alternating current power supply and the microwave chemical reactor; the temperature sensor is connected with the microwave chemical reactor; and the microprocessor control module is also connected with a keyboard circuit. By the system, the problem of incapability of accurately controlling the temperature of the reactor in the prior art is solved; and temperatures are acquired, and the on-off of a microwave generator is controlled by the bidirectional silicon-controlled rectifier, so that the temperature of the microwave chemical reactor can be accurately controlled in a set temperature range, and a reliable temperature guarantee is provided for effective completion of a reaction.

The invention discloses a preparation method of an MnO<2>@GCs@MnO<2> composite material and belongs to the technical field of material preparation. The method comprises the steps as follows: a graphene capsule is firstly prepared; the prepared graphene capsule and potassium permanganate are added to water and are mixed evenly to obtain a mixed solution of the potassium permanganate and the graphene capsule; the mass ratio of the potassium permanganate to the graphene capsule material is 4 to (3-10); the concentration of the potassium permanganate is 0.05-0.15mol/L; finally, the mixed solution of the potassium permanganate and the graphene capsule is put into a microwave chemical reactor for reaction at 500-750W for 3-10 minutes; the reaction temperature is controlled at 90-100 DEG C; and after reaction is ended, the obtained turbid liquid is centrifugally separated and dried. The method disclosed by the invention is simple to operate, high in efficiency, high in manganese dioxide loading capacity and good in dispersity; and the prepared electrode material is good in conductivity and cycling stability and has relatively high specific capacitance.

The present invention relates to a microwave chemical reaction device in the chemical research and the chemical field, in particular to a microwave chemical reaction device for research, pilot test and output magnification of microwave chemical reaction under relatively low temperature. The present invention provides a microwave chemical reaction device with integrated refrigeration and microwave radiation, which comprises a microwave radiating cavity, an embedded microwave reactor, a microwave power, a magnetic control pipe and a refrigerating device; the embedded microwave reactor is arranged in the microwave radiating cavity; the microwave radiating cavity is directly connected with the refrigerating device for continuous refrigeration of the microwave radiating cavity; the microwave power and the magnetic control pipe are connected with the microwave radiating cavity. The present invention can provide high-strength and high-intensity microwave radiation and ensures that the reaction system is under the low temperature or superlow temperature condition while greatly increasing the chemical reaction speed, thus providing full reaction activated energy, increasing the reaction speed and overcoming the damages of high temperature on reactants or target molecule structure, activity and shape.