59results about How to "Increase mass concentration" patented technology

A method and apparatus for treating contaminated water are described wherein contaminated natural water or industrial wastewater is treated to remove contaminants in a packaged modular treatment unit.

The invention belongs to the technical field of feed, and particularly relates to compound feed for improving the production performance of laying hen and the egg quality. The compound feed consists of corn, lard oil, soybean meal, rape seed cake, peanut meal, gunite bran, mountain flour, calcium hydrophosphate, lysine, methionine, liquid phytase, liquid xylanase and premix. The compound feed provided by the invention can obviously improve the production performance of laying hen and improve the laying rate and the egg quality, and can increase the weight of a single egg and reduce the damage rate of eggs; and moreover, after being eaten by the laying hen, the compound feed can promote digestive absorption, improve the feed conversion rate and the feed-gain ratio, and increase the economic benefits of laying hen farming.

The invention provides a method for efficiently preparing 5-hydroxymethyl furfural (HMF) utilizing biomass widely existing in a natural world as a raw material. The method includes the following steps: utilizing a two-phase system composed of low-boiling point organic matter and water, adopting acid salt of sulfuric acid and sulfuric acid metal normal salt as a catalyst in synergy mode to form a catalyst system, adding the biomass raw material capable of being degraded to hexose to a reaction system and preparing the HMF by reaction. The reaction process of the method has high HMF selectivity. The catalyst is low in price, mild in operation condition, simple in process and low in separation energy consumption. The biomass raw material with a wide source is utilized as the reaction raw material, preparation of biomass-based chemical and alternative fuel with the biomass as the raw material can be favorably promoted, and the method has high industrialized prospect.

Methods for activating the surface of steel alloys to produce catalytic substrates for the synthesis of carbon nanomaterials by chemical vapor deposition are provided. Steel alloy substrates in a variety of forms are activated by brief (10 sec to 30 min) pre-treatment at high temperature (600-1000° C.) in an oxidizing environment (e.g., air) to activate the catalyst. Upon high temperature oxidative treatment, the initially smooth and protective chromium oxide coating layer of the steel alloy is destroyed, and the catalyst surface roughness progressively increases. Upon exposure of the pre-treated SS substrates to pyrolyzed hydrocarbon gases in nitrogen, carbon nanotubes are readily formed, and their diameters correlate with substrate surface roughness. Forests of vertically aligned nanotubes can be prepared with the method.

The invention discloses a novel reverse-osmosis scale inhibitor which comprises the following raw materials in parts by weight: 2-8 parts of sodium citrate, 33-45 parts of hydrolytic polymaleic anhydride, 28-37 parts of polyepoxysuccinic acid salt, 9-15 parts of urotropine, 13-20 parts of polylactic acid, and 40-50 parts of water. A preparation method comprises the following steps: adding sodium citrate, hydrolytic polymaleic anhydride, polyepoxysuccinic acid salt, urotropine and half of water into a reaction kettle, heating to 40-50 DEG C, and stirring for uniformly dissolving; dissolving polylactic acid with the rest water to obtain a polylactic acid solution; heating the materials in the reaction kettle to 70-75 DEG C, dropwise adding the polylactic acid solution, and keeping the temperature for 3-4h after the dropwise adding is finished; and cooling to room temperature so as to obtain the novel reverse-osmosis scale inhibitor. The novel reverse-osmosis scale inhibitor disclosed by the invention has the scale inhibition rate being up to 95%, is small in adding amount, environmentally friendly, stable in property, and long in storage period, and can be used for solving the problems that existing reverse-osmosis inhibitors mainly are foreign products and are limited in treatment capacity, complex in synthesis, relatively high in production cost, and the like in the prior art.

The invention discloses a preparation method of cellulosic fibers. The preparation method includes the following steps that 1, cellulose pulp is mixed with an NMMO water solution with the mass concentration of 60%-85%, preferably 70%-76% to obtain a uniform mixture; 2, the obtained uniform mixture is subjected to dehydration swelling and dissolution defoaming to obtain a cellulose spinning solution; 3, the obtained cellulose spinning solution is filtered and subjected to heat exchange and then enters a spinning machine, after the cellulose spinning solution is extruded through a spinning assembly and air-cooled, the cellulose spinning solution enters a solidification system and is solidified in an NMMO solidification bath with the mass concentration larger than 50% and smaller than 72%, and nascent fibers are obtained; 4, the obtained nascent fibers are washed to obtain cellosilk bundles, and then the cellulosic fibers are obtained through subsequent section treatment. Equipment investment can be greatly reduced, the process is simplified, energy consumption and industrialization cost are reduced, safety production is promoted, the homogeneity and mechanical performance of the fibers are improved, and therefore the preparation method is more suitable for efficient low-consumption industrial production.

The invention discloses a method for recovering tannic acid from rosin production wastewater. Multistage extraction and multistage back extraction methods are adopted for recovering tannic acid from the rosin production wastewater. The method comprises the following steps: firstly, removing oil from the wastewater in an up-float manner; adjusting the pH of the wastewater to 1 to 6; then, adding asodium alginate flocculant to flocculate the wastewater; filtering and performing multi-stage counter-current extraction on filtrate by using di(octan-2-yl)methylphosphonate; performing multi-stage counter-current back extraction treatment on extraction liquid loaded with tannic acid with a NaOH solution; lastly, purifying, concentrating and drying a strip liquor to obtain industrial tannic acid,wherein tannic acid is 75 to 82 percent in purity. By adopting the method, tannic acid is recovered, the biodegradability of the wastewater is improved, and the subsequent biochemical treatment difficulty is lowered.

The invention relates to a semiconductor device formation method. The semiconductor device formation method comprises steps that a substrate is provided, the substrate has a first active region and a second active region, and the first active region and the second active region have opposite types; a first dummy grid electrode structure at the first active region and a second dummy grid electrode structure at the second active region are formed on the substrate, the first dummy grid electrode structure comprises a first grid medium layer and a first dummy grid electrode, and the second dummy grid electrode structure comprises a second grid medium layer and a second dummy grid electrode; an interlayer dielectric layer is formed on the substrate, and the upper surface of the interlayer dielectric layer is level with the upper surface of the first dummy grid electrode and the upper surface of the second dummy grid electrode; the first dummy grid electrode is removed to form a first dummy grid slot; the second dummy grid electrode is removed to form a second dummy grid slot; third grid dielectric layers are formed at the bottom portion and side walls of the second dummy grid slot. According to the semiconductor device formation method, parameters of material composition and thickness of the first grid dielectric layer and the third grid dielectric layers can be respectively adjusted, and thereby performance of transistors of the corresponding first grid dielectric layer and the third grid dielectric layers is improved.

The invention belongs to the technical field of carbon fibers, and particularly relates to a polyacrylonitrile suspension with high solid content and low viscosity, a preparation method and application thereof, and a preparation method of a polyacrylonitrile-based carbon fiber. The polyacrylonitrile suspension with high solid content and low viscosity provided by the invention has the advantages of high monomer concentration and low viscosity of a polymerization system, and is beneficial to the rate of uniform dispersion of supplemented polymerization monomers during continuous polymerization and the transfer of polymerization reaction heat; and the formed small particles are beneficial to long-time survival of active free radical chains, rapid polymerization and preparation of polyacrylonitrile with high molecular weight can be realized, and a homogeneous polyacrylonitrile spinning solution with low viscosity and high mass concentration can be further formed through subsequent demonomerisation and defoaming. The polyacrylonitrile fiber and the polyacrylonitrile-based carbon fiber which are prepared by spinning with the high-mass-concentration homogeneous polyacrylonitrile spinning solution provided by the invention have relatively high monofilament tensile strength.

The invention discloses a preparation process of polymer modification silicon sol. The preparation process is characterized by comprising the following steps: (1) placing 2,400 mass parts of silicon sol into a reaction container, adding 240 mass parts of deionized water into the reaction container, heating until the temperature rises up to 80 DEG C, and keeping the temperature of 80 DEG C constant until the reaction is completed to form a uniform stable system; (2) keeping the temperature of the system in the reaction container to be 80 DEG C, slowly adding 72 mass parts of polymer modifier which needs to be completely added within 30 min into the reaction container under a stirring state, continuously stirring the reaction system for 5 h at a constant temperature until the reaction is completed to obtain the polymer modification silicon sol, and modifying the pH value of the reaction system to be in a range of 10-11 by using a pH modifier at time intervals of 30 min within 5 h. The process is simple and efficient, and the prepared silicon sol is high in polishing speed, good in hardness, excellent in thermal stability under a long-time storage state, and high in repeated utilization rate.

The invention relates to an energy-saving formaldehyde production system which comprises an evaporator, a gas mixer, an oxidizing reaction tower, a steam separation tower, an adsorption tower and a tail gas recycling device. The evaporator is connected with the gas mixer, the gas mixer is connected with a steam source, an outlet of the gas mixer is connected with a steam inlet of the oxidizing reaction tower, and a steam outlet of the oxidizing reaction tower is connected with a steam inlet of the steam separation tower. A steam exhaust port of the steam separation tower is connected with an inlet of the adsorption tower, a tail exhaust port of the adsorption tower is connected with a tail gas recycling device, and the steam separation tower comprises a tower body. The upper portion in the tower body is provided with at least one piece of metal regular filler through a frame, a liquid suction disc is arranged on the lower portion of the metal regular filler, and a water circulating cooling pond is arranged on the lower portion of the liquid suction disc. A large amount of steam in a formaldehyde gas mixture can be effectively removed through the steam separation tower, and therefore the mass concentration of produced formaldehyde products can be effectively improved.

The invention discloses a drag reducer for fracturing and a preparation method thereof. The drag reducer for fracturing consists of, in percentage by mass, 10%-30% of a water-soluble monomer, 5%-35% of water, 30%-65% of base oil, 5%-30% of an emulsifier, 1%-3% of an electrolyte with a salting-out effect and 0.001%-0.1% of an initiator. Under the initiation of the initiator, a water-in-oil system formed by an aqueous phase solution and an oil phase solution is subjected to a reversed-phase microemulsion polymerization reaction. According to the invention, the drag reducer for a fracturing fluidis synthesized by adopting a reversed-phase emulsion polymerization mode; the fracturing fluid is a water-soluble polymer with a small amount of hydrophobic groups on a hydrophilic macromolecular chain, and the solution has special thickening and shearing-resistant effects due to the specific amphiphilic molecular structure of the fracturing fluid; and the drag reducer has the advantages of highdrag reduction rate, strong compatibility, shearing resistance, low friction resistance, low damage and wide application range.

Nickel-free austenitic stainless steel comprising, in mass percent:

• • chromium in amounts of 10<Cr<21%;
  • manganese in amounts of 10<Mn<20%;
  • molybdenum in amounts of 0<Mo<2.5%;
  • copper in amounts of 0.5≦Cu<4%;
  • carbon in amounts of 0.15<C<<%;
  • nitrogen in amounts of 0<N≦1, and

the remainder being formed by iron and any impurities from the melt.

The invention discloses a water-based graphene dispersion liquid and a preparation method thereof, and belongs to the technical field of graphene modification. The water-based graphene dispersion liquid is a durable stable dispersion liquid prepared by taking single-layer and/or double-layer and/or multi-layer nano graphene as a raw material to carry out a reaction with a chelating-type titanate under the action of ultrasonic waves and mechanical stirring. The water-based graphene dispersion liquid prepared by the preparation method is good in dispersion liquid stability, and no sedimentationphenomenon occurs when the dispersion liquid is placed for 30 days; the dispersion liquid is low in viscosity and good in liquidity, the dispersion medium is water, and no polymer is added or generated, so that the application field is wide; the preparation process of the dispersion liquid is simple, the reaction is mild, the modification time is short, and industrial application is easier; the dispersion liquid is an environment-friendly product, no harmful impurities are introduced in the preparation process, and a used coupling agent can be wound or bonded with a composite material to forma whole substance in subsequent processing.

The invention discloses a high-purity methyl acetate production process device and method. The high-purity methyl acetate production process device comprises a reactive distillation column and a plurality of external reactors, wherein the reactive distillation column is dividend into a methyl alcohol separation section, a multilayer reaction section, an extraction section and a rectifying section from bottom to top. The multilayer reaction section is of a multilayer tower plate structure. The reaction section of each layer of tower plate is circularly connected with the corresponding external reactor through a pipeline. The extraction section is communicated with the multilayer reaction section and is provided with an acetic acid inlet. The top of the rectifying section is further connected with a condenser and a return tank. The separation section is provided with a methyl alcohol inlet, and the bottom of the separation section is circularly connected with a reboiler. Reaction and separation are organically combined, so that a reaction rate is increased, reverse reaction is suppressed, and a conversion rate is effectively improved. Therefore, the mass concentration of methyl acetate products is improved, and the device can be used for producing high-purity (97% or more) methyl acetate products and has the advantages of simplicity, high efficiency, remarkable economic benefits and the like.

The invention discloses a thickener capable of treating high-concentration ore pulp. The thickener comprises a reaction cavity, a mounting mechanism, a transmission mechanism and a discharging mechanism, wherein the reaction cavity comprises a peripheral cavity, a fall pressure chamber, a primary treatment chamber, a secondary treatment chamber, a primary sedimentation cavity and a secondary sedimentation cavity; when the thickener works, ore pulp materials enter the primary treatment chamber along a feed pipe, solids with larger particle sizes are deposited in the primary treatment chamber and enter the primary sedimentation cavity through a screen, the sedimentation and flocculation of the materials are accelerated by the rotation of primary inclined main boards, and sedimentation flocculates enter the secondary sedimentation cavity through a screen at the bottom of the primary sedimentation cavity; and secondary inclined main boards in the secondary sedimentation cavity drive stirring shafts, stirring frames and stirring blades to stir, so that secondary sedimentation of the materials is promoted. The thickener can treat ore pulp with the mass concentration of more than 45-55%, the treatment speed of the high-concentration ore pulp is high, the power consumption and the abrasion degree of a reaction cavity and a rake plate are low, and the service life of the thickener is prolonged.

The invention belongs to the technical field of materials, and discloses a regulation and control method and application of a hydroxyapatite nanoparticle aggregate. The regulation and control method comprises the following steps of: (a) dissolving polyacrylic acid, and regulating the pH value to be neutral or alkaline to obtain a polyacrylic acid solution; and (b) adding nano-hydroxyapatite into the polyacrylic acid solution in the step (a), and mixing under an ultrasonic condition to obtain the hydroxyapatite nanoparticle aggregate. According to the regulation and control method and application of the hydroxyapatite nanoparticle aggregate disclosed by the invention, by combining the ultrasonic dispersion with the polyacrylic acid, nano-hydroxyapatite is regulated to form a shuttle-shaped hydroxyapatite nano-particle aggregate in water, and the dispersity of theaggregate is high. The regulation and control method is simple and easy to implement and high in production efficiency. According to the hydroxyapatite nano-particle aggregate prepared by the regulation and control method, the compounding uniformity of nano-hydroxyapatite and a high polymer material can be remarkably improved, and a composite material with the nano-hydroxyapatite proportion as high as 75.4% is prepared.