52results about How to "No hydrolysis" patented technology

The invention discloses a nitrogen purging-assisted organic exhaust gas recycling method through the pressure swing adsorption of adsorbent resin. The organic exhaust gas recycling method comprises the following steps: (1) adsorption, namely performing adsorption when exhaust gas including volatile organic compounds (VOCs) enters an adsorber filled with the macroporous adsorption resin by a gas collection system; (2) desorption, namely vacuumizing the adsorbent resin in the adsorber and purging the adsorbent resin by using nitrogen in an auxiliary manner to desorb the adsorbed VOCs from the adsorbent resin to obtain the desorbed gas; and (3) recycling, namely condensing or absorbing the desorbed gas to recycle the VOCs. The adsorbent adopted by the method disclosed by the invention is the macroporous adsorption resin, the surface of the macroporous adsorption resin has no catalytic performance and has the characteristics of being easy to regenerate, high in mechanical strength, great in volumetric adsorption capacity and the like. A adsorption technique assisted by nitrogen purging in vacuum at normal temperature is high in adsorption efficiency and has the very excellent recycling effect on VOCs gas which can be easily oxidized and hydrolyzed or is high in solubility.

The invention provides novel cyanide-free silver plating electroplating liquid and an electroplating technology. The cyanide-free silver plating electroplating liquid comprises, by mass concentration, 1.5-4 g/L of silver nitrate, 2-50 g/L of potassium carbonate, 2-100 g/L of hydantoin, 0.1-100 g/L of potassium gluconate, 0.1-100 g/L of potassium malate, 0.1-150 g/L of citric acid, 0.1-280 g/L of hydantoin, 0.1-280 g/L of butynediol and 0.001-20 g/L of alkyl sulfonic acid surface active agent. The electroplating technology comprises the steps of pretreatment, washing, activating, washing, beforehand silver plating, silver plating, recycling, washing, adjusting treatment, washing, hot water washing (80 DEG C), washing and silver protective agent treatment. The novel silver plating technology has the main beneficial effects that firstly, the plating liquid is very stable and easy to control, the current efficiency of the plating liquid is high, and the dispersing capability and covering capability are good; secondly, a cyanide-free formula is adopted in the electroplating liquid, potential danger of cyanide is eliminated, and pollution to the environment is greatly reduced; and thirdly, the various properties of a plating layer are not lower than those of cyaniding silver plating, and a functional cyaniding silver plating technology can be thoroughly replaced.

The invention discloses a composite urea formaldehyde resin curing agent as well as a preparation method and application thereof. The composite urea formaldehyde resin curing agent comprises the following components: catalyst, controlled release formulations, pH stabilizing agent and water. After the composite urea formaldehyde resin curing agent of the invention is directly mixed into urea formaldehyde resin adhesive with low molar ratio, the curing rate and the curing performance of the urea formaldehyde resin adhesive with low molar ratio can be effectively improved, and thereby the bonding strength thereof is improved and the formaldehyde released content thereof is obviously reduced, and the production efficiency and the product quality are improved; and moreover, the composite urea formaldehyde resin curing agent of the invention has long working life, and can meet the requirements of production operation of artificial boards.

The invention discloses a piezoelectric material for lead-free piezoelectric ceramic with potassium-sodium niobate and a preparing method, which strengthens the ferroelectric performance of potassium-sodium niobate ceramic and further improves the piezoelectric performance. The material of the invention comprises anhydrous potassium carbonate, natrium carbonicum calcinatum, niobium pentaoxide and dibismuth trioxide, the stoichiometric proportion of the lead-free piezoelectric ceramic is (K0.5 Na0.5) Nb3 + x weight percent Bi 2O3, wherein the x is more than or equal to 0 and less than or equal to 1, the piezoelectric material for lead-free piezoelectric ceramic with potassium-sodium niobate is obtained through mixture making, drying and burnishing, granulation, molding, sintering and after polarization by a silver electrode; therefore, the densification of the ceramic is improved, polarized drain current of the ceramic is reduced, and the polarization process is carried out more easily; moreover, the piezoelectric material adopts the material from a conventional process and industry, has the characteristics of good process stability and no pollution.

The invention relates to the technical field of oil and gas field down-hole operation, and specifically relates to a low-pressure sandstone reservoir gas well temporary blocking workover fluid and a preparation method thereof. The workover fluid is composed of the following components, according to percentages in the wellbore volume: 10-20% of an alcohol-based temporary blocking workover fluid, 0.5-1% of an oil-based spacer fluid, and 79-89.5% of a high-efficiency clay stabilizing agent. The alcohol-based temporary blocking workover fluid is composed of the materials of, by mass, 0.5-1% of a water-absorbent polymer, 1-2% of temporary blocking fiber, 0.5-1% of a fiber dispersing agent, 45-50% of water, and balance of alcohol. The high-efficiency clay stabilizing agent is composed of the materials of, by mass, 0.6-1% of a clay stabilizing agent and 99-99.4% of water. With the workover fluid provided by the invention, effective temporary blocking can be realized upon a porous sandstone reservoir; and the harm of the workover fluid upon stratum can be reduced. The workover fluid also has the characteristic of good salt tolerance. With the workover fluid, hydrate blockage is not formed. The workover fluid is safe and environment-friendly, and is convenient for construction.

The invention provides high-performance cyanide-free silver pre-plating liquid aiming at the problem of poor adhesion between a substrate and a plating layer in an existing cyanide-free silver plating technology. The pre-plating liquid mainly comprises silver nitrate, methylsulphonic acid, hydantoin, potassium hydroxide, potassium carbonate and nicotinic acid. A high-performance cyanide-free silver pre-plating process has the main advantages that the process is strong in operability and easy to control, the current density is 0.2-0.5 A/dm<2>, the dispersing and covering capabilities are good, and the process adapts to the pre-electroplating of complicated parts; the adhesion between the substrate and the plating layer obtained by silver pre-plating and silver plating is good, the color change resistance is good, and the conductivity and weldability are excellent; by a high-concentration complexing agent and a stabilizer, the pre-plating liquid can be stored for a long term without hydrolysis and is hardly decomposed under the electroplating process conditions. The cyanide-free silver pre-plating liquid provided by the invention can be used for copper, iron and alloy castings, also can be used for silver plating of plastic surfaces, and is widely applied to product surface finishing and the like in the fields of aviation and electronic industries.

The invention discloses a preparation method of anhydrous magnesium chloride. The method comprises the following steps: firstly, internally dehydrating magnesium chloride high hydrate under the protection of HCl gas, so as to obtain low hydrate, and then removing residual water through chemical reaction, so as to obtain the high-purity anhydrous magnesium chloride. The initial dehydrating temperature is low, so that the fact that the magnesium chloride is not hydrolyzed and the energy consumption is greatly reduced; a dehydrating agent adopted during the dehydrating in the chemical reaction is formed by the reaction of sulfur and chlorine, intermediate components are continuously recycled, the dehydrating in the chemical reaction ensures that the product anhydrous magnesium chloride is completely disengaged with water environment, and produced side reaction products SO2 and HCL are gases, so that the occurrence of hydrolysis reaction is thoroughly avoided. The method is wide in raw material resource and low in price, the whole technical process is good in economic benefit, and the method provided by the invention is high in operability and easy to realize industrialization.

The invention discloses an in-situ repair method of tailing sand heavy metal. The in-situ repair method of the tailing sand heavy metal is characterized in that a high-pressure jet grouting process is adopted to perform the jet grouting on modified attapulgite-contained pulp into tailing sand in situ, so that the heavy metal is cured.

The invention discloses a reactive light stabilizer suitable for protein fibers. The structural formula of the reactive light stabilizer is any one of the following structural formulas (please see the specification for the structural formulas). The invention further provides a preparing method of the reactive light stabilizer. The preparing method includes the steps that halogen is introduced into light stabilizing sections of the light stabilizer through a chemical reaction, obtained compounds and p-nitrophenol generate a substitution reaction in alkali liquor with the equivalent amount, and therefore nitro-group-containing ether compounds are generated; primary arylamine compounds, with ether bonds as bridge groups, connected with the light stabilizing sections are generated through the ether compounds with a thiourea dioxide reduction method, wherein amino groups of the primary arylamine compounds are located at the para-position of ether groups. The light stabilizer and the protein fibers can be firmly combined through aldehydes materials under the mild reaction condition by means of a Mannich reaction.

The invention relates to a method for improving mass spectrum fragmentation efficiency and response based on peptide fragment C-terminal chemical derivation. The method comprises three steps of reaction: firstly, sealing carboxyl at the tail end of a peptide fragment C or carboxyl at the tail end of the peptide fragment C and carboxyl of side-chain glutamic acid or aspartic acid; then, using peptide fragment amidase for specific hydrolysis and exposing carboxyl at the tail end of the peptide fragment C; and finally, carrying out chemical derivation of alkaline molecules on the exposed C-terminal carboxyl. Alkaline molecules marked at the tail end of the peptide fragment C can increase the number of y ions in the secondary mass spectrum and improve the fragmentation efficiency and responseof the peptide fragment in the mass spectrum so that the method is applied to improve the detection sensitivity of polypeptide drug peptides.

The invention discloses a method for determining the content of a tantalum element in a nickel-based alloy. The method comprises the following steps: (1) preparing a standard Ta element standard solution; (2) establishing an interference correction model according to the actual content range of Cr, V and other elements in the nickel-based alloy; (3) measuring the Ta element standard solution on aninductively coupled plasma emission spectrometer, and drawing a standard curve; (4) accurately weighing a nickel-based alloy sample, and preparing a sample solution; and (5) determining the emissionintensity of the Ta element in the sample solution, calculating the content of the Ta element in the sample solution according to the standard curve, and correcting through an interference correctionformula to obtain the actual content of the Ta element in the nickel-based alloy. The method can accurately determine the actual content of the tantalum element in the nickel-based alloy, and has goodtest precision.

The invention discloses a fresh made white spirit and its making method, on the basis of producing process and technique of yellow wine and Qing wine, regulating and changing the use modes and methods of raw materials, saccharifying agent and fermenting agent in the fermenting wine process, its yield high. It is a simple-process, low-cost white spirit producing process, and the made white spirit has rich nutrition, tastes pure and mild and sweet and refreshing, and has a style of white spirit in taste and the same inner quality and nutrition content as those of the yellow wine and Qing wine.

The invention relates to a method for preparing a ruthenium nitrosyl nitrate solution, and belongs to the technical field of precious metal compound preparation. The method comprises: introducing ruthenium tetroxide gas into a nitric acid aqueous solution, and carrying out an absorption reaction to prepare a ruthenium absorption liquid; adding a reducing agent into the ruthenium absorption liquid,and reacting at 5-15 DEG C to obtain a ruthenium absorption liquid containing nitrosyl; adding a pH regulator A, regulating the pH value to 5-7, adding a pH regulator B, regulating the pH value to 8-10 to obtain a ruthenium precipitate, and repeatedly filtering and washing to remove impurities; and adding a nitric acid aqueous solution, and carrying out a reflux reaction for more than 2 hours toobtain a ruthenium nitrosyl nitrate solution; According to the invention, the ruthenium nitrosyl nitrate solution prepared by the method has the characteristics of low chlorine content, low nitric acid content, low metal impurity content, low corrosion and high stability.

The invention relates to a method for separating and purifying stevioside by using silica gel substrate strong anion exchange chromatography. Stevia leaves or stevioside crude products are used as rawmaterials, HP-SAX silica gel substrate strong anion exchange chromatography filler or a homotype finished product chromatographic column is used as a separation medium, separation and purification are performed with liquid chromatography, and three steviosides including stevioside, rebaudioside C and rebaudioside A are obtained simultaneously. The invention also relates to an application of the method in preparation of the stevioside, the rebaudioside C and the rebaudioside A by separation and purification. The method is convenient and rapid, single separation can be completed within 15 min,the purity of purified products is higher than 99.0%, repeatability is good, operability is high, an organic solvent aqueous solution in any proportion and even 100% water can be used as a chromatographic separation medium to wash away impurities such as inorganic salt and pigment caused by samples on the head of the chromatographic column, the separation medium is not prone to hydrolysis or collapse in the washing process, and the separation medium has long service life and can be reused for a long time.

A novel solidifying machine comprises a main machine seat and a main electrical cabinet. The main machine seat comprises a main lathe body and an upper frame. The two sides of the main lathe body are provided with sliding guide rod groups. The sliding guide rod groups are connected with the main lathe body and the upper frame. The main lathe body is further provided with a tempered glass platform which is horizontally fixed. The tempered glass platform is used for placement of matrixes. An ultraviolet radiator array is arranged below the temperate glass platform. The upper frame is provided with a lining top plate and an outer top plate. The lining top plate is provided with a cooling fan array. The outer top plate is provided with corresponding through holes corresponding to the cooling fans in position. An auxiliary electrical cabinet is further arranged on one side of the main lathe body. The auxiliary electrical cabinet is electrically connected with the sliding guide rod groups, the ultraviolet lamp array, the cooling fan array and the main electrical cabinet. According to the novel solidifying machine, a light source emitted by the ultraviolet radiator array is fully converted, the manufactured words are high in luminous effect and uniform in luminance, and the light transmittance and light conductivity of the manufactured words are far higher than those of traditional acrylic materials and epoxy resin materials.

The invention relates to a micro-water dyeing method suitable for wool. The micro-water dyeing method comprises the following steps that a, products to be dyed are prepared; b, a dedicated dyeing system is configured, specifically, reactive dyes and metered water only used for dissolving the reactive dyes are uniformly stirred, and poor solvents of the reactive dyes are added to prepare the dedicated dyeing system; c, dyeing is carried out; d, soaping is carried out; e, dehydrating is carried out; and f, drying is carried out, and dyeing products are obtained. Compared with a traditional woolreactive dyeing method, the dyeing method does not require any accelerating salt, with the help of non-aqueous media with low surface tension, the reactive dyes can be rapidly dyed to the surfaces ofwool fibers, the reactive dyes hardly hydrolyze without an alkaline agent, and the fixation rate of the reactive dyes is greatly improved. According to the micro-water dyeing method suitable for the wool, the use ratio of the reactive dyes for wool dyeing is effectively improved, the dyed wool is not required to be specifically processed, and the wet rubbing fastness meets the requirements in themarket.

The invention relates to the technical field of environmental protection and discloses UV light-cured varnish spraying waste gas recycling equipment and a technology. The equipment comprises a collection tower, a deflecting deceleration air-duct and a drying curing box which are successively communicated. Multiple layers of separating plates are fixedly installed inside the collection tower. An ultraviolet lamp tube is installed at the upper part inside the drying curing box. By the utilization of characteristics of varnish waste gas, the varnish waste gas successively undergoes gas-to-liquidconversion recovery, ultraviolet radiation curing, dust recovery, UV photolysis or activated carbon adsorption box adsorption, and finally the varnish spraying waste gas is discharged. The waste gas treatment is safe and environmentally friendly, and varnish waste gas is recycled and reused so as to save cost. Recycling of varnish waste gas is realized, and the equipment is safe, reliable and environmentally friendly by the curing process of the waste gas which is not completely recovered. The equipment is safe and environmentally friendly, and the technology is simple and effective.

The invention provides a synthesis method of 2-cyano-4-nitroaniline. The synthesis method comprises the following steps of: synthesizing 2-cyano-4-nitroaniline; the synthesis method comprises the following steps: a nitration step: 2-chlorobenzonitrile is dissolved in an organic solvent, a nitration reaction is carried out in the presence of mixed acid, a nitration product is obtained, and the nitration product contains 2-chloro-5-nitrobenzonitrile; a mixing step: mixing the nitration product with an inorganic solvent to obtain a mixed product; a separation step: standing and layering the mixed product to obtain an organic phase; ammonia gas and/or ammonia gas are/is introduced into the organic phase, an ammonolysis reaction is carried out, an ammonolysis product is obtained, and the ammonolysis product contains the 2-cyano-4-nitroaniline. According to the synthesis method, a large amount of sulfuric acid can be saved, and the used organic solvent can be recycled after the reaction is finished. Furthermore, the synthetic method disclosed by the invention can ensure that the 2-chloro-5-nitrobenzonitrile does not carry water and the cyano group is not hydrolyzed in the ammonolysis reaction process.