45results about How to "Solving Mass Transfer Problems" patented technology

The present invention relates to an activated coke for absorbing persistent organic pollutant like dioxin in flue gas and a preparation method thereof by using coal quality semi coke as a raw material. The preparation method is as follows: crushing the coal quality semi coke; impregnating the coal quality semi coke with an impregnating solution containing metal hydroxide or alkali metal carbonate activator and compound surfactant, and naturally drying; and finally activating the impregnated and dried semi coke at 800-950 DEG C to prepare the activated coke for absorbing dioxin in flue gas. The activated coke has characteristics of developed porous structure, low manufacturing cost and good adsorption effect, etc.

The invention discloses a technology for synthesizing dodecylbenzene sulfonic acid in a circulating microreactor. The technology is characterized in that a dodecylbenzene solution and a sulfonating agent which is a sulfur trioxide solution are rapidly mixed in a microporous dispersion reactor so as to realize sulfonation process; the obtained product flows back and is mixed with dodecylbenzene, and the mixture circularly enters a microreactor for further reacting; after sulfur trioxide is fed, the mixture is aged for 30-50min, and then the solvent which is 1, 2-dichloroethane is recovered by rotary evaporating so as to obtain the dodecylbenzene sulfonic acid product. According to the technology, the microporous dispersion technology is carried out to fully mix dodecylbenzene and the sulfonating agent, so that byproducts produced due to high local concentration of sulfur trioxide can be effectively avoided; moreover, the reaction temperature can be accurately controlled, so that local overheat due to heat produced in the reaction can be avoided; the reaction process and the ageing process are combined, so that the conversion rate of dodecylbenzene is increased; the dodecylbenzene sulfonic acid in the main product is up to 98% by mass; and the product is basically free from waste acid; and the product is easily separated.

The invention relates to a photocatalytic degradation treatment device of the wastewater with organic pollutants. The treatment device contains a box. The treatment device is characterized in that the inside of the box is provided with a plurality of relatively independent baffled chambers which are connnected end to end; the both ends of the box are separately provided with a water inlet and a water outlet; in each baffled chamber, a plurality of three-dimensional reticular bodies with immobilized catalyst are stacked at intervals, the center of each three-dimensional reticular body is provided with a through hole, a ultraviolet light source is inserted in the through hole, and an aeration pipe is arranged at the bottom of the baffled chambers; and each three-dimensional reticular body is formed by stacking several layers of reticular carrier, the space between the layers of reticular carrier is 1-3 times of the reticular width, the periphery of the reticular carrier is bent to the bottom surface relatively, the center of the reticular carrier is provided with an I-shaped notch, and the notch is bent to the bottom surface. An illumination device is inserted in the notch. By adopting the device of the invention, the organic matter in wastewater can be decomposed to a large extent.

The invention relates to a preparation method of heat curing fluorosilicone raw rubber. The preparation method comprises the following steps: adding D3F and D4Vi into a reactor and then dehydrating D3F and D4Vi, adding prepared potassium silanolate catalyst pre-polymer, heating, introducing nitrogen and stirring to carry out polymerization, wherein the temperature is 60-115 DEG C and the reaction time is 20-100min, neutralizing with a neutralizer until the reactant is neutral, and finally, removing small molecular substances from the material, reducing temperature and discharging. Due to the adoption of the potassium silanol catalyst pre-polymer with high activity, the reaction temperature is low, the accelerant is not required, an end-capping reagent is not required in the polymerization process, and the nitrogen purging manner is adopted in the stage of removing the small molecular substances from the material, the volatile matter of the heat curing fluorosilicone raw rubber is reduced; the prepared heat curing fluorosilicone raw rubber can be widely used in the fields of aerospace, petrochemical industry, automobiles, artificial organ, and the like, and has a good promotional value.

The invention discloses a preparation method of an all-solid-state Z-shaped heterojunction photocatalyst. The preparation method comprises the following steps: 1) adding tungstic acid and ammonia water into deionized water A, after uniformly stirring, adding oxalic acid and anhydrous ethanol, then adding a PS template, then carrying out vacuum impregnation, drying and calcination to obtain a 3DOM-WO3 catalyst, then adding deionized water B, then adding a chloroplatinic acid solution, stirring under irradiation of an xenon lamp by a photo-reduction method to obtain a 3DOM-WO3/Pt catalyst, finally carrying out heat treatment to obtain 3DOM-HxWO3/Pt; 2) adding L-cysteine, Cd(NO3)2 and 3DOM-HxWO3/Pt into water, then uniformly stirring to obtain a mixed solution; and 3) adding a Na2S solution into the mixed solution, then carrying out hydrothermal reaction, after reaction is ended, cooling to room temperature, then carrying out washing, centrifugal separation, freezing and drying to obtainthe Z-shaped heterojunction photocatalyst. The all-solid-state Z-shaped heterojunction photocatalyst prepared by the invention has the characteristics of high quantum efficiency and difficult composition of photon-generated carriers, and the photocatalytic activity is higher.

The invention discloses a method and a device for preparing modified meta-aramid fiber through continuous polymerization-dry-wet spinning. The method comprises the following steps that (1), a DMAc mixed solution of m-phenylenediamine and a copolymerized diamine monomer is prepared by using a cosolvent; (2), the isophthaloyl dichloride melt is mixed with a DMAc mixed solution of m-phenylenediamine and a copolymerized diamine monomer, and pre-polycondensation and polycondensation are carried out to obtain a modified meta-aramid resin solution; and (3), auxiliaries are added into the modified meta-aramid resin solution, filtering, defoaming, and spinning are carried out by a dry-wet method to obtain modified meta-aramid fibers. A pre-polymerization system of the continuous polymerization-dry-wet spinning device comprises a micro-mixer and a micro-reactor which are connected in sequence, and a micro-channel of the micro-reactor is designed to be heart-shaped; and the polycondensation system is a multi-stage microscrew combination. The problems in the preparation process of the meta-position aramid fiber are comprehensively solved, the obtained product is complete in structure, excellent in performance, stable and controllable, and continuous and efficient production can be achieved.

The invention relates to a wastewater treatment process, in particular to a method for treating low-concentration difficult-to-degrade organic wastewater through adsorption-electrocatalysis combination. The method comprises the steps of adding an adsorbent into the low-concentration non-biodegradable organic wastewater, after the adsorption time T, carrying out solid-liquid separation, feeding thewastewater reaching to the follow-up treatment standard or the emission standard into a follow-up treatment process, and feeding an adsorbent obtained through separation into a follow-up desorption process; adding the separated adsorbent into a desorption solution, after desorbing for a certain time, carrying out solid-liquid separation, feeding an adsorbent obtained through separation into a next adsorption process or aftertreatment process, and carrying out electrocatalytic oxidation treatment on the rest desorption solution; adding the desorption solution into an electrocatalysis reactor,powering up, and carrying out electrocatalysis treatment on organic matters in the desorption solution; feeding liquid reaching to the follow-up treatment standard or the emission standard into a follow-up process.

The invention relates to a titanium silicate molecular sieve catalyst comprising an organic functional group. The titanium silicate molecular sieve catalyst comprises a silicon source, a titanium source, a template, a mineralizer and a solvent, wherein the silicon source is Si(OR1)4, (R2O)3Si-(CH2)n1-Si(OR3)3 and (R4)n2Si(OR5)4-n2, the titanium source is Ti(OR6)4, the template is [(CH3)3CH3(CH2)n3N<+>]X<->, the mineralizer is [(CH3Cn4H2n4)4NH4]<+>OH<->, and the solvent is a mixture of water and alcohol. As the structure of a molecular sieve comprises the hydrophobic anti-carbon organic functional group and a composite hole, the hydrophobicity and the mass transfer performance of the catalyst are excellent, the activity and the selectivity are high, the stability is good, and the catalyst is applied to production of a corresponding epoxide through alkene epoxidation, wherein H2O2, hydrogen peroxide, cumyl hydroperoxide and tert-butyl hydroperoxide are taken as oxidizing agents in the alkene epoxidation.

The invention discloses a hierarchical pore structure high polymer material and a preparation method thereof, and belongs to the field of porous polymer materials. The preparation method comprises the following steps: (1) mixing hydrophobic silicon dioxide particles with an initiator, then adding a polymerizable monomer, a cross-linking agent, an assistant cross-linking agent and a pore-foaming agent, and uniformly stirring to obtain a reaction mixed solution; (2) adding water into the reaction mixed solution, and stirring until a gel emulsion is formed; and (3) performing staged thermal polymerization on the gel emulsion to obtain the hierarchical pore structure high polymer material. According to the invention, the content and size of pores and pore throats in the material can be effectively regulated and controlled, and the high polymer material with the multistage micron pore structure is obtained. The material is good in heat transfer in the polymerization process, free of implosion phenomenon and high in product percent of pass; a wet material obtained by polymerization is rich in pores, small in resistance in a mass transfer process and relatively high in drying rate; meanwhile, the hierarchical pore structure high polymer material disclosed by the invention has excellent machining performance and static load resistance.

The invention relates to a titanium-silicon molecular sieve catalyst. The titanium-silicon molecular sieve catalyst is prepared from a silicon resource, a titanium source, a template agent, a mineralizer and a solvent, wherein the silicon resource is Si(OR1)4, (R2O)3Si-(CH2)n1-Si(OR3)3 and (R4)n2Si(OR5)4-n2; the titanium source is Ti(OR6)4; the template agent is [(CH3)3CH3(CH2)n3N<+>]X<->; the mineralizer is [(CH3Cn4H2n4)4NH4]<+>OH<->; the solvent is water; and hydrothermal crystallization is performed, so that the titanium-silicon molecular sieve catalyst with a composite hole structure and high hydrophobic characters is prepared. The titanium-silicon molecular sieve catalyst disclosed by the invention has the following advantages that the catalyst is simple in preparation process, and high in production efficiency; besides, a molecular sieve structure contains organic functional groups of Si-(CH2)n1-Si, Si-O-Si(R4)n2 and Ti-O-Si(R4)n2 and composite holes having hydrophobic characters and anti-carbon-deposition functions, so that the catalyst has excellent hydrophobic character and mass transfer performance, is high in activity and selectivity and good in stability, can be used in the process of producing corresponding epoxides from alkenes through epoxidation by using H2O2, ethylbenzene hydroperoxide, cumene hydroperoxide, tert-butyl hydroperoxide and the like as oxidizers.

The invention belongs to the technical field of core-shell structure catalysts, and particularly relates to a novel method for preparing a core-shell structure catalyst. The novel method for preparingthe core-shell structure catalyst is different from the prior art. A microreactor is adopted in the novel method for preparing the core-shell structure catalyst, and a carbon-supported metal core isprepared in the microreactor, a shell metal is reduced by using polyol, and the shell metal is reacted with the carbon-supported metal core to prepare the core-shell catalyst. The method for preparingthe core-shell structure catalyst has higher preparation efficiency, less required raw materials and simple operation.

The invention discloses a magnetic response nanorod-shaped desulfurization adsorbent which has a stirring function under the action of a magnetic field and can improve mass transfer rates in macroscopic and microscopic solid-liquid/liquid-liquid/gas-liquid systems. The magnetic response nanorod-like desulfurization adsorbent is composed of a magnetic nanorod and a coated porous shell layer, the length range of the magnetic nanorod is 1-30 [mu] m, the magnetic saturation susceptibility is 1000-15000 Oe, and the thickness range of the coated porous shell layer is 50-300 nm.