64results about How to "Avoid competitive adsorption" patented technology

The invention provides a coupling method of catalytic cracking gasoline desulfurization. The coupling method comprises the following steps: cutting gasoline raw materials into light fractions, medium fractions and heavy fractions; carrying out extractive distillation on the medium fractions by an organic solvent to obtain olefin-contained raffinate and extracts which contain sulfide and arene; separating the organic solvent in the extracts to obtain extraction oil; carrying out selective hydrodesulfurization on the extraction oil and the heavy fractions to obtain the desulfurization heavy fractions; mixing the light fractions, the raffinate and the desulfurization heavy fractions to obtain desulfurization gasoline, wherein the cutting temperature of the light fractions and the medium fractions is 35 to 60DEG C, and the cutting temperature of the medium fractions and the heavy fractions is 140 to 160DEG C. According to the coupling method of the gasoline desulfurization, the octane value loss of a gasoline product can be obviously reduced, and desulfurization load is drastically lowered while deep desulfurization is realized. The yield of the product is greater than 95%.

The invention discloses a method for preparing waste water processing materials of organic-inorganic composite bentonite which comprises, (1) disintegrating the alta-mud, passing through 100 mesh sieve, charging into the solution of cationic surface active agent, stiring 1-2 hours in water-bath, (2) charging AlCl3 solution into the suspending liquid, stirring 5-10 minutes, (3) while water-bath stirring, charging NaOH or Na2CO3 solutions into the suspending liquid, stewing for over 10 hrs at room temperature, (4) multitime washing, filtering, drying and grinding.

The invention provides a combination method for producing ultralow sulphur gasoline. The combination method includes the following steps that gasoline raw materials are cut into light fractions, medium fractions and heavy fractions; the medium fractions are subjected to liquid-liquid extraction, and olefin-containing medium-fraction raffinate and sulfide-and-arene-containing medium-fraction extract oil are obtained; the heavy fractions are extracted and distilled, and olefin-containing heavy-fraction raffinate and sulfide-and-arene-containing heavy-fraction extract oil are obtained; selective hydrogen desulfurization is carried out on the medium-fraction extract oil and the heavy-fraction extract oil, and desulfurized fractions are obtained; the light fractions, the medium-fraction raffinate, the heavy-fraction raffinate and the desulfurized fractions are mixed, and the desulfurized gasoline is obtained. The cutting temperature of the light fractions and the medium fractions ranges from 35 DEG C to 50 DEG C, and the cutting temperature of the medium fractions and the heavy fractions ranges from 80 DEG C to 110 DEG C. By means of the combination method, deep desulfurization is achieved; meanwhile, losses of the octane value of gasoline products can be remarkably reduced, desulfurization loads can be greatly reduced, and the product yield is higher than 95%.

The invention discloses a beta-cyclodextrin polymer adsorbent applicable to adsorption of dye and heavy metal ions, and a preparation method and application thereof. According to the method, modifiedbeta-cyclodextrin, obtained by reaction between a silane-protected beta-cyclodextrin derivative and alkenyl anhydride, and heterocyclic olefinic monomers are subjected to free-radical crosslinking copolymerization to obtain the beta-cyclodextrin polymer adsorbent, wherein the structural general formula is shown in the description. The porous large-specific-surface copolymer can be formed during copolymerization between the modified beta-cyclodextrin and the heterocyclic olefinic monomers, and different adsorption sites are provided for the organic dye and the heavy metal ions, so that the adsorption capacity of the adsorbent can be improved greatly, and the mutual inhibition of the organic dye and the heavy metal ions as wells as the poor removal effect can be relieved effectively.

The invention relates to a preparation method of a metal carrier Tenax coating stirring and extracting rod, which comprises the following steps of: a, selecting and preprocessing a metal rod; b, synthesizing heat-resistant epoxy resin; c, manufacturing a stirring rod coating; d, curing the coating; and e, removing impurities of the extracting rod body, wherein the extracting rod is used in a stirring manner, and the metal is iron, nickel, cobalt, stainless steel or alloy; and when the extracting rod is used in a headspace or ultrasonic manner, the metal is stainless steel, copper, aluminum or alloy. Tenax is fixed on the surface of the metal rod by using the synthesized heat-resistant epoxy resin or organic silicon resin to form a coating material with heat stability and solvent washing resistance, thus the extracting rod realizes the enrichment of trace organic matters. The invention is especially suitable for processing samples of soil, air, essence and spice, indoor air, alcohol, phenol, amine-aldehyde, ketone, aryl halides and the like.

The invention provides method for carrying out advanced desulphurization on gasoline. The method comprises the following steps: cutting a gasoline raw material into light fraction, intermediate fraction and heavy fraction; carrying out liquid-liquid extraction on the light fraction to obtain olefin-containing light fraction raffinate oil and light fraction extraction oil containing sulfide and aromatic hydrocarbon; carrying out extraction distillation on the intermediate fraction to obtain olefin-containing intermediate fraction raffinate oil and intermediate fraction extraction oil containing sulfide and aromatic hydrocarbon; carrying out selective hydrodesulfurization on the light fraction extraction oil, the intermediate fraction extraction oil and the heavy fraction to obtain a desulfurized heavy fraction; and mixing the light fraction raffinate oil, the intermediate fraction raffinate oil and the desulfurized heavy fraction to obtain desulfurized gasoline, wherein the cutting temperature of the light fraction and the intermediate fraction is 80-120DEG C, and the cutting temperature of the intermediate fraction and the heavy fraction is 150-170DEG C. The method has the advantages of realization of advanced desulphurization, great reduction of the loss of the octane number of a gasoline product, and great reduction of the desulphurization load, and allows the yield of the product to be greater than 95%.

The invention relates to a catalyst for synthesis of ethanol from synthetic gas. The catalyst includes the following components by weight percentage: 1.0-20.0% of copper oxide, 5.0-15.0% of zirconia, 1.0-6.0% of potassium oxide, and 60.0-90.0% of a carrier. The catalyst and the method provided by the invention have the advantages of high selectivity, simple preparation process and mild operation process conditions.

The invention discloses an online pretreatment method and an online pretreatment device of SVOCs (Semi Volatile Organic Compounds) in water. A water sample circulates to carry out contact adsorption with a fixed extracting rod by using an online pulse extraction technology, so that the competitive adsorption of the surface of a stirrer on the sample in solid phase microextraction of fiber is avoided, and the extracting rod is prevented from colliding with a container, thus the service life is prolonged. On the basis of the method, the invention also provides the online pretreatment device of the SVOCs in water, which can be used for realizing procedures of fully-automatic sampling, sampling matching, adsorptive enrichment, analysis and self-washing of a flow passage as well as intermittent pretreatment of the SVOCs in the water sample and is very suitable for online pretreatment of the SVOCs in the water.

The invention relates to a method for purifying thiocyanate ions in cyanide-containing wastewater by means of flocculation and sedimentation. By means of research on a purification process of the cyanide-containing wastewater with different concentrations, the process parameters such as solution pH values and the consumption of ferric sulfate and polyferric sulfate are determined; the cyanide-containing wastewater is acidified, and cyanide is recovered; then, the residual cyanide is filtered and removed by means of by precipitation of the ferric sulfate; lime milk is added into the filtrate for adjusting the pH, and the thiocyanate ions are removed by means of flocculation and precipitation of the polyferric sulfate. The method solves the problem that due to the accumulation of the thiocyanate ions in the gold cyanide smelting wastewater, barren liquor can not be reused normally, and the normal smelting process is further influenced; the method guarantees the normal proceeding of goldcyanide leaching and subsequent absorption and replacement processes, and effective improves the smelting recovery rate.

The invention discloses a method for preparing cement asphalt (CA) mortar for China railway track system (CRTS) II slab ballastless tracks, which comprises the following steps of: (1) mixing cement with fine sand, an expanding agent and aluminum powder according to proportion to prepare dry CA mortar powder; and (2) sequentially adding a poly carboxylic acid serving as a high-performance water reducing agent, an antifoaming agent and silica sol into water for uniform stirring, adding the dry CA mortar powder for uniform stirring, and adding asphalt emulsion for uniform stirring to obtain the CA mortar for the CRTS II slab ballastless tracks. The method has the advantages of: (1) avoiding cement particles competitively absorbing an emulsifier in the asphalt emulsion, and preventing the asphalt emulsion in the CA mortar from being demulsified to cause bleeding; and (2) reducing the using amount of the asphalt emulsion and the using amount of the water on the basis of ensuring flowability, and strengthening the strength of the CA mortar on the basis of meeting an elastic modulus of the CA mortar.

The invention provides a gasoline desulfurization method which comprises the following steps: performing extractive distillation on gasoline fractions, so as to obtain extraction residues containing olefin and extractives containing sulfides and arene; performing desulfuration treatment on the extractives, so as to obtain desulfurized gasoline fractions and sulfur-rich gasoline fractions, wherein the desulfuration treatment is liquid-liquid extraction or adsorption desulfuration; separating organic solvents in the extractives, so as to obtain extract oil containing sulfides and arene. Through the adoption of the gasoline desulfurization method, the deep desulfurization can be realized, the octane value loss of gasoline products can be remarkably reduced, the desulfuration load can be greatly reduced, and the product yield is greater than 95%.

The invention relates to a stirring extraction bar with a composite carbon nanofiber coating and a preparation method thereof. The stirring extraction bar with a composite carbon nanofiber coating is characterized in that a bar body of the stir extraction bar with a composite carbon nanofiber coating is prepared from a glass tube and an iron core which is shorter than the glass tube and is enclosed in the glass tube; and the surface of the bar body is coated with a coating, wherein the coating comprises carbon nanofibers and polydimethylsiloxane composite with the carbon nanofibers. Through utilization of adsorption characteristics of polydimethylsiloxane and carbon nanofibers, the stir extraction bar with a composite carbon nanofiber coating overcomes the defects of poor adsorption effects produced by a single material, and enlarges the scope of coating selectivity on adsorbates.

The invention relates to a metal carrier Tenax coating stirring and extracting rod which uses metal as a carrier, wherein a coating contains a Tenax adsorbing agent, the extracting rod is used in a stirring manner, the metal is selected from iron, nickel, cobalt, stainless steel or alloy; and the extracting rod is used in a head space or ultrasonic manner, the metal is selected from stainless steel, copper, aluminum or alloy. The extracting rod is used for fixing the Tenax on the surface of the metal rod by using synthetic high-temperature epoxy resin or organic silicon resin to form a coating material with good heat stability and solvent rinsing resistance, thus trace organic matters are enriched. The invention is especially suitable for processing samples, such as soil, atmosphere, essence perfume, indoor air, alcohol, phenol, amine and aldehyde, ketone, aryl halides and the like.

The invention discloses a lubricating oil composition for an integrated electric drive assembly speed reducer. The lubricating oil composition comprises the following components in percentage by weight: 80%-90% of base oil, 4%-12% of a viscosity index improver, 5.5%-8% of a composite additive, 0.1%-0.5% of a reinforcing agent and 0.3%-0.5% of a pour point depressant. The product provided by the invention has relatively low viscosity, relatively high viscosity index, excellent high-temperature oxidation resistance, extreme-pressure wear resistance, shearing stability, copper corrosion protection and electrochemical characteristics; the lubricating oil provides excellent protection for gears and bearings, has good compatibility with sealing materials and motors, provides excellent protectionand power output efficiency for integrated electric drive assembly reducers, and is especially suitable for lubrication of integrated electric drive transmissions of pure electric buses.

The invention provides a deep desulfurization method for gasoline. The method comprises steps as follows: cutting a gasoline raw material into a light fraction and a heavy fraction; performing liquid-liquid extraction on the light fraction to obtain light fraction raffinate containing alkenes and light fraction extract oil containing sulfides and arenes; performing extractive distillation on the heavy fraction to obtain heavy fraction raffinate containing alkenes and heavy fraction extract oil containing sulfides and arenes; performing selective hydrodesulfurization on the light fraction extract oil and the heavy fraction extract oil to obtain a desulfurized fraction; mixing the light fraction raffinate, the heavy fraction raffinate and the desulfurized fraction to obtain desulfurized gasoline, wherein the cutting temperature of the light fraction and the heavy fraction is 80-120 DEG C. With the adoption of the deep desulfurization method for the gasoline, deep desulfurization can be realized, meanwhile, the octane number loss of a gasoline product can be significantly reduced, the desulfurization load can be reduced substantially, and the product yield is higher than 95%.

The invention provides a gasoline desulfurization combination method. The combination method includes the following steps that gasoline raw materials are cut into light fractions and heavy fractions; the heavy fractions are extracted and distilled through organic solvents, and olefin-containing raffinate and sulfide-and-arene-containing extract are obtained; the organic solvents in the extract are separated, and extract oil is obtained; selective hydrogen desulfurization is carried out on the extract oil, and desulfurized heavy fractions are obtained; the light fractions, the raffinate and the desulfurized heavy fractions are mixed, and desulfurized gasoline is obtained. The cutting temperature of the light fractions and the heavy fractions ranges from 35 DEG C to 60 DEG C. By means of the combination method, losses of the octane value of gasoline products can be remarkably reduced while deep desulfurization is achieved, and the product yield is higher than 95%.

The invention relates to the field of electronic ceramic substrates, provides a method for co-firing an aluminum nitride ceramic substrate, and solves the defects of low heat conductivity and high energy consumption caused by over-high sintering temperature of co-fired aluminum nitride ceramic in the prior art. Comprising the following preparation steps: (1) batching and ball-milling: feeding aluminum nitride powder and a sintering aid into a ball mill for ball-milling treatment; (2) defoaming: aging the ball-milled slurry for 2-3 hours, and defoaming the slurry in a defoaming machine until the viscosity of the slurry reaches 20000-23000 mPa.s; (3) tape casting: feeding the slurry treated in the step (2) into a tape casting machine for tape casting, and standing for 6-8 hours; (4) punching; (5) laminating: decompressing the printed green sheet according to the thickness requirement; (6) glue discharging is conducted, specifically, the green body pieces treated in the step (5) are placed in a nitrogen protection glue discharging furnace, and glue discharging is conducted under the nitrogen atmosphere till the carbon content is 2000 ppm or below; and (7) sintering.

The invention discloses a preparation method of a chiral molecularly imprinted adsorption-extraction stirring rod and belongs to the technical field of analytical chemistry and sample pretreatment. The preparation method comprises the following steps: first, inserting an iron core into a capillary tube sintered at one end, intercepting a proper length, and then blocking the capillary tube to obtain a stirrer, activating the prepared stirrer, dissolving chiral template modules and a chiral functional monomer in a polymerization solvent, ultrasonically and uniformly mixing the mixture and leaving the mixture to stand, and adding a crosslinking agent and an initiator to obtain an assembling solution and removing oxygen; and injecting the assembling solution without oxygen into the glass capillary tube sintered at one end, inserting the stirrer, carrying out water bath heating and initializing polymerization through a click reaction, removing a jacket of the glass capillary tube after thereaction, and cutting the coating to a proper length by a blade to prepare the chiral molecularly imprinted adsorption-extraction stirring rod. The stirring rod prepared by the preparation method canbe applied to adsorbing a naproxen raceme in a sample.

The present invention discloses the preparation process of high purity acarbose. The fermented liquid with acarbose is first separated in the first separation system to eliminate mycelium, soluble protein, culture medium and partial pigment to obtain clear acarbose filtrate; the clear acarbose filtrate is then concentrated, decolorized and desalted to eliminate partial monosaccharide, inorganic salt and other small molecular impurity to obtain clear acarbose concentrated solution; and finally through chromatographic resin adsorption, gradient acid pickling, nano filtering film concentration and spray drying, high purity acarbose product is obtained. The present invention has shortened technological path, high total acarbose yield and high product purity.