55results about How to "Limit generation" patented technology

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 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.

TG (22) (timing signal generator), frequency divider (28), oscillator (27), and signal processing IC (30) generate the drive signal and transfer signal of CCD (21), and when CCD (21) passes Wherein for exposure for a long time exposure not less than a predetermined time period, adjusting each of the clock frequency of the drive signal during the exposure period and the clock frequency of each of the drive signal and the transfer signal during the transfer period is is lower than a corresponding clock frequency in an exposure state in which exposure is performed for less than said predetermined period of time.

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.

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 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 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 discloses an acid-activated montmorillonite-loaded cesium catalyst and its application in catalyzing the synthesis of aziridine from monoethanolamine. The carrier of the catalyst is acid-activated montmorillonite, and the composition of the active component is CsaXbOc, where X is phosphorus, iron or boron, O is oxygen, and a, b, and c are the molar ratios of Cs, X, and O. When a When =1, b=0.5~1.5, the value of c depends on a and b. The catalyst is prepared by activating the montmorillonite acid and loading the active components with an equal-volume impregnation method, and the method is simple and the conditions are controllable. The invention utilizes the acid to activate the montmorillonite to adjust the acidity of the catalyst, and the obtained catalyst is used for the intramolecular dehydration reaction of the monoethanolamine to synthesize the aziridine, which not only improves the conversion rate of the monoethanolamine, but also maintains the high selectivity of the product aziridine.

The invention relates to a catalyst for olefin prepared by synthesis gas and a preparation method of the catalyst, and mainly aims to solve the problem of low selectivity of low C2-C4 olefin in fischer-tropsch synthesis. The problem can be well solved by adopting a technical scheme that the catalyst is prepared from the following components in parts by weight: 1-20 parts of a shell which is one of ZSM-5 and beta zeolite and 80-99 parts of a kernel, wherein the kernel comprises 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 of Fe and Co carried on (a), (c) 1-10 parts of at least one metal or oxide of Mn, Zn, Mg and Cu, and (d) 0.1-5 parts of oxide or hydroxide of K, Na, Rb and Cs. The catalyst can be applied to industrial production of olefin preparation by synthesis gas.

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.

Provided is a producing method of a semiconductor device (10). The method comprises the step of cutting a part of the resin insulating layer (13) formed on the surface (11a) of a semiconductor substrate (11) by means of a cutting tool (30). Cutting a part of the resin insulating layer (13) contains cutting the part of the resin insulating layer (13) which is provided with a metal layer (15). Cutting a part of the resin insulating layer (13) is executed in a manner that in the stress distribution of the inner resin insulating layer (13) along the edge part (30a) of the cutting tool (30) and of the periphery part of the edge part (30a), the width of 90% of the maximum value is no larger than 1.3 Mum.

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.