55results about How to "Limit generation" patented technology

The invention discloses a process for continuously producing diethanolamine by using a selective catalyst. The process is characterized by comprising the following steps of: selecting a proper modified microporous material as the catalyst; and feeding ethylene oxide and anhydrous liquid ammonia into a fixed bed reactor according to a certain proportion for reaction, wherein the production of monoethanolamine (MEA) and triethanolamine (TEA) is limited by aperture adjustment of the microporous material and change of reaction process conditions so as to obtain high-content diethanolamine (DEA). The catalyst of the invention is one or mixture of more than two of ZSM-5 zeolite molecular sieve, beta zeolite molecular sieve, ZSM-11 zeolite molecular sieve, SAPO-3 zeolite molecular sieve and APOL-40 zeolite molecular sieve; and the reaction raw materials are the anhydrous liquid ammonia and the ethylene oxide. The process has the advantages of saving consumption of the raw materials and obviously reducing the investment cost, along with short production period and high target product yield.

The invention relates to a catalyst for preparation of olefine from synthesis gas and a preparation method thereof, and mainly solves the problem of low C2-4 olefine selectivity in Fischer-Tropsch synthesis. The technical scheme of the catalyst for preparation of olefine from synthesis gas is as follows: the catalyst comprises the following components in parts by weight: 1-20 parts of one selected from ZSM-5 or beta zeolite used as a shell and 80-99 parts of core, wherein the core comprises the following components in parts by weight: a) 50-100 parts of at least one selected from Al2O3 or SiO2 used as an oxide supporter, b) 5-50 parts of at least one metal selected from Fe or Co or oxide thereof, c) 1-30 parts of at least one metal selected from Mn, Zn or Cu or oxide thereof, and d) 0.1-5 parts of oxide or hydroxide of at least one of K, Rb or Cs; and the components b), c) and d) are loaded on the oxide supporter. Thus, the problem is well solved; and the catalyst can be used for preparation of olefine from synthesis gas.

The invention relates to a prestress-reinforced light high-strength controllable-degradation medical composite material and a preparation method thereof. The medical composite material is characterized in that a magnesium alloy wire subjected to prestress processing is taken as a reinforced phase to improve strength and stiffness of the composite material, an absorbable high polymer material is taken as a matrix, and meanwhile, the early-stage degradation velocity of the composite material can be further regulated and controlled by regulating the thickness of a shell protection layer formed by the high polymer material of the matrix. According to the composite material, bars or plates are manufactured by utilizing methods of thermal die pressing, extrusion or drawing or the like, and various degradable high-toughness bone repairing and fixing instruments such as bone nails and bone plates can be obtained by carrying out subsequent machining; and compared with the conventional absorbable polymer bone surgery instruments, the composite material has the advantages that the mechanical fixing effect is relatively good, and furthermore, the problems that the degradation speed of the absorbable magnesium alloy bone surgery instruments is difficult to control and the hydrogen release quantity during degradation is large and the like can be overcome.

The present invention relates to a catalyst for preparing olefins from synthetic gas and a preparation method thereof, and mainly solves the poor middle and low-C2-C4 olefin selectivity problem of tropsch synthesis. The catalyst for preparing the olefins from the synthetic gas comprises the following components in parts by weight: 1-20 parts of ZSM-5 shell and 80-99 parts of an inner core, the inner core includes the following components in parts by weight: a) 80-100 parts of a carrier selected from SiO2 or Al2O3; b) 3-20 parts of at least one metal or oxide selected from Fe or Co; c) 1-10 parts of at least one metal or oxide selected from Mn, Zn, Mg or Cu; d) 0.1-5 parts of an oxide or a hydroxide selected from K, Na, Rb or Cs; and e) 0.1-2 parts of at least one oxide selected from Se and Te; and by the technical scheme, the problem is well solved, and the catalyst can be used for industrial production of preparing of olefins from synthetic gas.

The invention provides an ultraviolet (UV)-curing plasma display circuit protective agent with silver ion migration resistance and a preparation method thereof. The protective agent comprises the following components by mass percent: 20-80wt% of modified (methyl) acrylic prepolymer, 10-60wt% of photoreactive monomer, 0.1-5wt% of processing aid and 0.05-1wt% of silver ion absorbent. In the preparation method, the components are fully dispersed and filtered to obtain the UV-curing plasma display circuit protective agent. The UV-curing plasma display circuit protective agent has the advantages of double synergistic effect of physical coating and silver ion chemical absorption, silver ion migration resistance, normal-temperature curing capability, high production efficiency, energy conservation, good adhesive force, good insulating property, good durability and the like, and is environment-friendly; and the protective agent can be applied to protection and insulation of a plasma display circuit as well as a thick film hybrid integrated circuit, a low noise circuit, a high-stability passive network, a high-frequency linear circuit, a high-precision linear circuit, a microwave circuit, a high-voltage circuit and the like which need to prevent silver ion migration.

The invention relates to a multi-function anti-scaling / descaling / bacterium-alga inhibition device which mainly comprises a power supply module, a controller module, a fan, a power amplifier integrated package, a spiral wound electric pulse magnetic field coil, an electromagnetic conversion part and other components, wherein the power supply module is used to carry out alternating / direct current conversion, and the control module is used to produce square signals; the power amplifier integrated package adopts a field effect tube paralleling mode, so that sufficient current can be produced, and the output power of the circuit can be further increased, thereby meeting the requirements for magnetic field intensity; the electromagnetic conversion part is mainly used for producing an alternating electromagnetic field; and the spiral wound electric pulse magnetic field coil is equivalent to an inductor wound on a water pipe, thereby producing an alternating magnetic field in the water pipe. Thus, the device provided by the invention is simple and easy to install and is maintenance-free, thereby being a preferred product for industrial anti-scaling / descaling / bacterium-alga inhibition.

The invention discloses a production method of fluorine-containing cyanate ester resin. A specific production process comprises the following steps of firstly, producing a dicarbonyl unsaturated monomer, then making the dicarbonyl unsaturated monomer reacted with a Grignard reagent to produce unsaturated alkylene trimethoxy phenyl ether, then introducing silicon and fluorine onto a monomer, and conducting cross-linking by means of boric acid to produce the fluorine-containing cyanate ester resin. The fluorine-containing cyanate ester resin produced through the method contains multiple cyanateester groups, and has multiple acting sites, moreover, the multiple cyanate ester groups are distributed in different directions, the steric hindrance of a single monomer resin molecule is large, generation of a triazine ring in a curing process is limited, thus the tenacity of the resin is greatly improved, moreover, the cyanate ester groups in the different directions can be reacted at the sametime in the multiple directions, in a polymerization process, hyperbranched structures can be formed in the different directions, and the rigidity of a polymer is further reduced, so that compared with bisphenol A cyanate ester resin, a produced resin monomer has high tenacity.

The invention discloses a method for preparing alkylation gasoline through polycondensation of methanol. The method comprises the following steps: 1) condensing formaldehyde so as to obtain methylal, deoxidize the methylal to form olefin and absorbing the methylal by using solvent oil at the same time so as to obtain mixed hydrocarbon; 2) carrying out methanol dehydroxylation addition to methylate olefin so as to obtain butane, absorbing alkane simultaneously by the mixed hydrocarbon so as to obtain multi-distillation-range alkylation mixed hydrocarbon; and 3) reforming the mixed hydrocarbon so as to obtain mixed alkane multi-distillation-range gasoline. The method for preparing alkylation gasoline through polycondensation of methanol disclosed by the invention has the advantages that the prepared gasoline meets the national standards, and the cost of raw materials can be effectively reduced for gasoline production; the fixed-asset investment of products is reduced; the energy consumption for gasoline and diesel production based on methanol conversion is reduced; and the safety and application cycle of production equipment are improved, and the method lays a foundation for the subsequent production process of CO2-methanol recycling energy.

An auger for digging holes that minimizes the amount of loose dirt excavated in and around the dug hole. The auger comprises an elongated shaft body whose axial longitudinal center is disposed in a parallel offset position from the axial engagement line of orientation with the driving source for rotationally driving the auger. The shaft body of the auger revolves in an eccentric lateral orbit as the auger rotates which digs the hole by pushing and widening the dirt in the hole rather than cutting and scraping. The distal end of the auger has a tapered configuration for initial penetration into the ground. The eccentric movement of the shaft body of the auger helps to compact the walls of the hole being dug.

The invention discloses high-toughness and high-cohesiveness C250 ultrahigh-strength hybrid fiber concrete and a preparation method thereof. The ultrahigh-strength hybrid fiber concrete is prepared from cement, sand, gravel, fly ash, straw ash, silica fume, nano silicon, water, a water reducing agent, an exciting agent, a defoaming agent, a shrinkage reducing agent, ramie fibers, basalt fibers, CaCO3 whiskers, a carboxyl modified polyvinyl alcohol polymer and nano titanium / graphene oxide dispersion liquid according to the mixing ratio of (550-560): (760-770): (830-840): (65-70): (103- 108): (125-135): (5.4-5.6): (70-75): (20-21): (16-17): (3-3.3): (14.5-15): (7.5-8): (13.3-13.6): (21-21.5): (22-23.5): (42-46). The materials are evenly mixed at intervals through a layered stirring method, and discharging, forming and curing are conducted. The mechanical property and durability of the concrete and the bonding property between the concrete and the profile steel are obviously improved.

The invention provides a method for preparing taurine from sodium isethionate. The method comprises the following steps of: efficiently catalyzing the ammonolysis reaction of sodium isethionate by using a Pd-C / Al2O3 heterogeneous catalyst with a shape selection function, and then conducting neutralizing, crystallizing, separating and the like to obtain a taurine product. Compared with a traditional basic catalyst, the catalyst provided by the invention can be used for limiting the generation of macromolecular by-products including disubstituted sodium taurate and trisubstituted sodium tauratethrough a unique pore channel structure, so that the selectivity of sodium taurate in the ammonolysis reaction is improved; meanwhile, due to the excellent catalytic performance of the catalyst, the temperature and the pressure of the ammonolysis reaction are effectively reduced, the reaction time is shortened, and the catalyst can be separated and recycled through simple filtration.

In order to enable the production of high-purity deionized water and inhibit scale formation, an electric device for producing deionized water is provided with at least one desalination treatment unit, said desalination treatment unit being provided between a cathode chamber (E1) and an anode chamber (E2), and being formed from a desalination chamber (D) and a pair of concentration chambers (C1, C2) which are provided on both sides of the desalination chamber (D) and into which an anion exchanger is filled. The desalination chamber (D) is partitioned, by an ion exchange membrane, into a first small desalination chamber (D-1) which is adjacent to one side of one of the concentration chambers (C1), and a second small desalination chamber (D-2) which is adjacent to the other concentration chamber (C2); the anion exchanger is filled into the first small desalination chamber (D-1), and the anion exchanger and a cation exchanger are filled into the second small desalination chamber (D-2) in an order such that the last ion exchanger through which the water which is undergoing treatment passes is the anion exchanger; and on the cathode side of the anion exchanger filled into the second small desalination chamber (D-2) a bipolar membrane (4a) is arranged in an orientation such that the anion exchange membrane surface thereof faces the anion exchanger.

The invention relates to the technical field of circuit fault current limiting, and specifically relates to a short-circuit fault current-limiting transformer. The current-limiting transformer comprises a transformer and short-circuit protection circuits. The secondary coil of the transformer is composed of three identical secondary coils. A low-voltage tap is led out from each of the three secondary coils. One short-circuit protection circuit is connected between each low-voltage tap and the high-voltage end of the corresponding coil. Each short-circuit protection circuit is a current limiting loop in which one low-voltage tap is sequentially connected in series with an auxiliary reactor, a short-circuit protection switch and a capacitor and then connected with the high-voltage end of the corresponding secondary coil, wherein the capacitor is connected in parallel with a power supply switch, and the common joint of the power supply switch and the short-circuit protection switch is connected to a power supply circuit. At the moment when a line fails, a large impedance is added between the power supply and the fault point, and thus, the fault current is limited.

The invention discloses a method for smelting chromium-containing ferronickel through laterite nickel ore. Nickel sulphide ore, a chromium-containing material and stainless steel smelting waste slag with a certain proportion are added into the laterite nickel ore, a rotary kiln pre-reduction-electric furnace process is adopted for smelting, a chromium-containing ferronickel product is used for producing 300-series austenitic stainless steel, the nickel sulphide ore and the chromium-containing material can serve as a part of a nickel source and a chromium source to improve the nickel and chromium grade in an alloy smelting product, other components in the nickel sulphide ore and the chromium-containing material are matched with multiple components in other stainless steel smelting waste slag to serve as a slag forming constituent to adjust the furnace slag smelting property, the reduction condition of chromium oxides can be improved, and separation of metal and slag can be reinforced. The method can improve the chromium grade and the chromium recycling rate in the ferronickel product, the smelting energy consumption can be greatly reduced, multiple metallurgical waste slag in the stainless steel production process can be sufficiently used, secondary resource recycling can be achieved, enterprise production cost is reduced, and the environment pollution brought by the metallurgical waste slag can be removed.

The invention belongs to the technical field of skin care products and particularly relates to a skin whitening and freckle removing essence and a preparation method thereof. The skin whitening and freckle removing essence comprises whitening ingredients, a water retaining agent, a thickener, oil, an emulsifier, a skin conditioner, a preservative and water, wherein the whitening ingredients are selected from a palmaria palmata extract, carnosine, 3-O-ethyl ascorbic acid and phenethyl resorcinol. The skin whitening and freckle removing essence formula is safe, can effectively whiten skin, inhibit melanin production and transportation, and protect the skin barrier from damage.

The invention discloses a monoethanolamine intramolecular dehydration catalyst. The carrier of the catalyst is acid activation montmorillonite. The active component of the catalyst is CsXY<c>O<d>, wherein X is phosphorus element, iron element or boron element, Y is rare earth element, O is oxygen element, a, b, c and d are the molar ratios of Cs, X, Y and O, and when a=1, b=0.5-2, c=0.2-1, and d is determined based on a, b and c. The acidity of the catalyst is regulated by means of the acid activation montmorillonite and phosphides, iron compounds or borides, the alkalinity of the catalyst is regulated by means of the rare earth element and Cs, the obtained catalyst is used for monoethanolamine intramolecular dehydration reaction to synthetize aziridine, and the conversion rate of monoethanolamine and the selectivity of aziridine can be improved at the same time.

The invention discloses an acid-activated montmorillonite cesium-loaded catalyst and an application of the acid-activated montmorillonite cesium-loaded catalyst in catalytic synthesis of aziridine from monoethanolamine. A carrier for the catalyst is acid-activated montmorillonite, and the composition of active components is CsaXbOc, wherein X is phosphorus, iron or boron element, O is oxygen element, a, b and c are molar ratios of Cs, X and O, when a is equal to 1, b is equal to 0.5-1.5, and the value of c depends on a and b. A preparation method of the catalyst comprises the step of loading the active components by using an equivalent-volume impregnation method after acid-activated treatment of the montmorillonite. The method is simple, and the conditions are controllable. According to the acid-activated montmorillonite cesium-loaded catalyst, and the application and the preparation method of the catalyst disclosed by the invention, the acidity of the catalyst is adjusted by utilizing the acid-activated montmorillonite, and the obtained catalyst is used for synthesis of aziridine by monoethanolamine intramolecular dehydration reaction, improves the conversion rate of the monoethanolamine, and also maintains high selectivity of the product aziridine simultaneously.

The invention discloses a coal-fired power plant turbulent burner suitable for low-order mixed coal combustion. The coal-fired power plant turbulent burner comprises a cone, an inner primary air shell, an inner secondary air shell, an outer primary air shell, an outer secondary air shell and a surrounding air shell, wherein the center cone is sleeved with the inner primary air shell, the inner primary air shell is sleeved with the inner secondary air shell, the inner secondary air shell is sleeved with the outer primary air shell, the outer primary air shell is sleeved with the outer secondary air shell, and the surrounding air shell is arranged on the outer side of the outer secondary air shell. An inner primary air channel is defined by the inner primary air shell, an inner secondary air channel is defined by the inner secondary air shell and the inner primary air shell, an outer primary air channel is defined by the inner secondary air shell and the outer primary air shell, an outer secondary air channel is defined by the outer primary air shell and the outer secondary air shell, and a surrounding air channel is formed outside the turbulent burner. By the adoption of the coal-fired power plant turbulent burner, the problem that air is insufficient when different types of coal of the large combustion difficulty characteristic difference are mixed and burned at a single primary air nozzle of a traditional turbulent burner is solved, and ignition and combustion of the types of coal difficult to burn can be promoted.

The invention relates to a method for directly preparing iodine monochloride from iodine-containing salt, and belongs to the technical field of iodine monochloride preparation. According to the method, pure iodine monochloride is directly prepared through reaction of the iodine-containing salt and chlorine gas, generation of iodine trichloride is avoided mainly by controlling the chlorine gas introduction speed, the chlorine gas introduction amount and the reaction temperature, and the reaction selectivity is improved. The method disclosed by the invention is simple to operate and mild in reaction condition, the recovered iodine-containing salt is used as a raw material, the source of the raw material is widened, the cost of the raw material is reduced, the purity of the prepared iodine monochloride is 99 wt% or above, and the requirements of industrial production are met.

The invention discloses high-toughness and high-cohesiveness C210 ultrahigh-strength hybrid fiber concrete and a preparation method thereof. The ultrahigh-strength hybrid fiber concrete is prepared from cement, sand, gravel, fly ash, straw ash, silica fume, nano silicon, water, a water reducing agent, an exciting agent, a defoaming agent, a shrinkage reducing agent, ramie fibers, basalt fibers, CaCO3 whiskers, a carboxyl modified polyvinyl alcohol polymer andnanometer titanium / graphene oxide dispersion liquid according to the mixing ratio of (525-535):(735-740):(890-900): (70-80): (85-95:(95-100):(4.7-5):(90-95):(17-18):(14.5-15):(2.5-2.9) :(12-13):(6.5-6.7):(12.2-12.5):(19-19.3):(20.5-22):(33-36). The materials are uniformly mixed by a layered stirring method, and are prepared and maintained. The mechanical property of the concrete and the bonding property and durability between the concrete and the profile steel are obviously improved.

The invention relates to the field of polymer materials and in particular relates to a modified foaming agent, a microfoamed polypropylene material and a preparation method. The modified foaming agentcomprises aliphatic glycidyl ester modified azodicarbonamide. The microfoamed polypropylene material comprises polypropylene resin, the modified foaming agent, a nucleating agent, an antioxidant anda lubricant. By introducing aliphatic glycidyl ester with an epoxy grpup into the azodicarboxylamide, the generation of ammonia is restricted, and the microfoamed polypropylene material with the modified foaming agent can be more environmentally friendly.

The invention discloses a taurine preparation method, which comprises: (1) in the presence of an ammonia water complex ion catalyst, carrying out an ammonolysis reaction on a sodium isethionate aqueous solution and ammonia to obtain a reaction solution containing sodium taurate; (2) performing deamination, concentration and water removal, acidification and crystallization on the reaction liquid containing sodium taurate to obtain taurine and mother liquor; the ammonia water complexing ion catalyst is obtained by complexing ammonia and a catalyst precursor, and the catalyst precursor contains one or more metal elements of chromium, zinc, nickel, cobalt, copper and silver. The method has the advantages of mild process conditions, short reaction time, high yield, simple catalyst source and the like.

The invention discloses cellulose fermentable sugar, and a preparation method and an application of same. The method includes the steps of: 1) mixing and stirring jute pulp with a mixed solution of sodium hydroxide and urea to form a mixture system, mass ratio of the jute pulp to the mixed solution being 1:40-60; 2) cooling the mixture system to -8 - -12 DEG C, stirring the mixture system for dissolution to form a cellulose solution; 3) neutralizing the cellulose solution, concentrating the solution, mixing the concentrated cellulose solution with a diluted sulfuric acid solution according to volume ratio of 1:4-12, and performing acid-hydrolysis to form the cellulose fermentable sugar. The method overcomes the problems of high safety risk and severe corrosion on equipment due to high acid concentration in the methods of acid-hydrolyzing cellulose in the prior art; the cellulose and semi-cellulose are acidolyzed and saccharified in a more simple and high-effective method. The cellulose fermentable sugar is used for producing bio-alcohol.

The invention belongs to the technical field of cultivation, and particularly relates to a sow patterned feeding method, and smashed feed for pregnant sow with low protein and high fiber in early andmedium periods of gestation. The sow feed in pregnant period is fed for 0-90 days after hybridization, and the specific feed amount is determined upon P2 backfat and body condition score. The sow feedin pregnant period is based on corn, bean pulp, extruded soybean, fine wheat bran, rice bran and others, and especially added with alfalfa grain, expanded flaxseed, fermented astragalus membranaceus,and Spanish bayonet plant extractive. The ratio of digestible amino acid is proper. By adopting the patterned feeding method, combining with sow feed in pregnant period, and applying a scientific feeding method, the sow weight and body condition are moderately controlled, the health birth number can be correspondingly increased, the sow birth performance is improved, and the sow mortality is reduced, and the sow feeding benefit is increased.