36results about How to "Same dwell time" patented technology

The invention discloses technology for producing direct spinning terylene industrial filaments after liquid state polycondensation of prepolymer and belongs to the technical field of spinning. The technology comprises the processes of esterification, prepolycondensation, liquid state polycondensation, and spinning, and is characterized by comprising the following steps of: performing prepolycondensation reaction on esterified ethylene glycol and phthalic acid to prepare a melt with the viscosity of 0.3 to 0.4dl/g, and conveying the melt to a liquid state polycondensation kettle for liquid state polycondensation by using a booster pump; and conveying the melt to a spinning beam for spinning through a gear pump, wherein the inherent viscosity of the polyester melt after liquid state polycondensation is 0.85 to 1.05dl/g. By directly conveying the melt into the liquid state polycondensation kettle for polycondensation and performing the production technology of directly spinning the melt, the production technology for producing the direct spinning terylene industrial filaments after the liquid state polycondensation of the prepolymer shortens the process flow, reduces the production energy consumption and production cost, and solves the technical problem of difficulty in conveying the melt simultaneously.

The invention relates to a method for preparing hydroxy neovaleraldehyde by condensing formaldehyde and isobutyraldehyde, which mainly solves the problems of lower conversion rate and lower selectivity in the prior art. The technical scheme is as follows: the method comprises the following steps: mixing formaldehyde and isobutyraldehyde in a mixer, mixing with a condensation catalyst, sending into a tubular reactor with a reinforced liquid-liquid mixing internal component, reacting at 50-90 DEG C under the pressure of atmospheric pressure to 0.5 MPaG for 30-120 minutes to obtain a condensation product, sending the condensation product into a rectification tower to perform reduced pressure rectification, discharging low-boiling-point substances from the tower top, and sending the purified hydroxy neovaleraldehyde-water mixture obtained from the tower bottom into the subsequent section. The technical scheme well solves the problems, and can be used for preparing hydroxy neovaleraldehyde by condensing formaldehyde and isobutyraldehyde.

The invention belongs to the field of chemical engineering and particularly relates to an efficient gas-liquid reaction kettle. Through the reaction kettle, the concentration gradient of a gas phase and a liquid phase in the reaction kettle can be effectively reduced, and all material components tend to be identical in staying time in the reaction kettle. The reaction kettle is provided with a stirring device, baffle plates, cooling fins, a spiral gas distributor and a liquid phase feeding nozzle, the stirring device is composed of a motor, a stirring shaft and stirring blades, and the stirring blades comprise the spiral blade and the long-strip-shaped blade. One or more gas phase feeding inlets are formed in the bottom of the reaction kettle, one or more liquid phase feeding inlets are formed in the lower part of the wall of the reaction kettle, meanwhile, the reaction kettle is provided with a pressure gauge and a thermocouple, and corresponding pipelines are each provided with a flowmeter and a control valve. Through the reaction kettle, the problems that the gas phase and the liquid phase are mixed unevenly, and staying time of materials is different are solved, meanwhile, the mixing effect of the materials is improved, a local sharp reaction is avoided, all the materials enter the reaction kettle to complete a reaction rapidly, and product quality is guaranteed.

The invention relates to a method for photochemically synthesizing vitamin D2 and D3 in a tubular reactor. The method is characterized in that the vitamin D2 and D3 are synthesized by ultraviolet light of different bands, the residence time of reaction liquid fed at different times in the tubular reactor is controlled to be the same by not dissolving with reaction liquid, not participating in reaction liquid separation and carrying ergosterol and 7-dehydrocholesterol reaction liquid and enhancing internal disturbance of the reaction liquid; the method has the advantages of continuous, stable and high efficiency of solar energy utilization, the operation is simple, and the process is controllable; the method has great prospect in the industrial production of the photochemically synthesizedvitamin D2 and D3.

The invention relates to a method for continuously preparing a highly-pure poly(m-phenylene isophthalamide) resin solution. The method comprises the following steps: respectively metering and conveying a polar solvent, m-phenylenediamine and m-phthaloyl chloride, allowing above materials to enter a double screw mixer, mixing the materials, carrying out a preliminary reaction to generate oligomer, allowing the oligomer to enter a polymerization reactor from the bottom end, continuously carrying out the reaction for a period of time, and allowing the formed poly(m-phenylene isophthalamide) resin solution to flow out from the upper lateral part of the polymerization reactor. The method can reduce at least one double screw reactor needed in the prior art, reduces the device investment cost, and realizes continuous preparation of the poly(m-phenylene isophthalamide) resin solution with uniform viscosity and high purity.

The invention relates to a gas separation flow system and a gas separation flow method for photochemical synthesis of 9-beta,10-alpha-dehydroprogesterone ketal. The method is characterized in that 9-beta,10-alpha-dehydroprogesterone ketal is synthesized in one step or two steps by utilizing ultraviolet light with different wave bands, a raw material 9-alpha,10-beta-dehydroprogesterone ketal reaction solution is separated by gas doing not participate in a reaction, the internal disturbance of the reaction solution is enhanced, and the retention time of the reaction solution in a tubular reactoris ensured to be consistent. The method has the advantages of being continuous, stable, high in light energy utilization rate, low in production cost, easy and convenient to operate and controllablein process, and has huge prospect in the industrial production of 9-beta,10-alpha-dehydroprogesterone ketal through photochemical synthesis.

The invention discloses a production method of melt direct spinning flat polyester industrial filaments. A spinneret plate with special '-' shaped section spinneret orifice is applied. Products are made by tackifying of molten fluid, melt spinning and tension winding molding. By using the production method of melt direct spinning flat polyester industrial filaments, the reaction time is decreased, technological process is effectively lessened, the efficiency is increased, energy consumption is reduced, and the cohesive property is greatly increased on the basis of keeping advantages of common industrial yarn. Because of the approximate rectangle section, the space between yarns is small, the contact area is added, the arrangement is more smooth and compact, and thus the yarn has great raw erectness and high cohesive property, relative good bending rigidity and flexibility. Because of compact arrangement of yarns and increased flatness, the aesthetics after blade coating is greatly increased, the production process is reduced and the production art is simplified.

The invention relates to a device for continuously preparing a high-purity polyisophthaloyl metaphenylene diamine resin solution. The device comprises a solvent metering conveying system, an m-phenylenediamine metering conveying system, an m-phthaloyl chloride metering conveying system, a double-screw mixer and a polymerization reactor, wherein the double-screw mixer is cooperated with the polymerization reactor for use; the polymerization reactor adopts a mode that materials are fed from the bottom and discharged from the upper side part; the investment cost of equipment is reduced; the polyisophthaloyl metaphenylene diamine resin solution with uniform viscosity can be continuously prepared.

The invention relates to a preparation method of a poly[2, 5-dyhydroxy-1, 4-phenylene pyridine diimidazole] polymer. The preparation method comprises two steps of prepolymerization reaction and post-polycondensation reaction. The reaction time of a prepolymer in a double-screw extruder is 10-60 minutes, and the double-screw extruder is provided with three temperature zones according to a sequence from a feeding port to a discharging port, wherein the temperatures of the tree temperature zones are respectively 160-180 DEG C, 180-190 DEG C and 190-200 DEG C. According to the preparation method, the double-screw extruder is used for carrying out the post-polycondensation reaction, and specific temperature and time are used for controlling parameters, so that the intrinsic viscosity [eta] of the PIPD polymer obtained in the end is 28-30dL/g, the molecular weight of the polymer is greatly increased, meanwhile, the stirring is facilitated, and the PIPD polymer can be easily conveyed and transferred to a spinning working section, thus the production efficiency is improved, and the production cost is reduced.

The invention discloses spinning components of bolt-fixing pattern to produce over 170 tons daily, which is characterized by the following: connecting head-cap seat (0105) and external ring of external pressure ring (0102) through high-strength bolt (206); opening melt canal (1) and distribution-cavity (2) in connection with melt canal (1) on the seat body of head-cap seat (0105); connecting the internal pressure ring (209) and pressure-resistant demarcation strip (0103) through high-strength bolt (0207) in order to locate the spinning plate (0108), demarcation strip (0107) and demarcation strip (0103) within the component of head-cap seat (0105) and external pressure ring (0102). The spinning component structure is simple and the bulk is small, which keeps stable productivity.

The invention relates to a spinning assembly for polyester fibers and an assembling device and method thereof. The spinning assembly comprises an assembly body, and a fastening ring, a limiting pin, an upper cover, a sand cup sleeve piece, a spot welding net, a sealing gasket, a positioning pin I and a spinneret plate are sequentially arranged in the assembly body; the sand cup sleeve piece comprises a sand cup, and a pressing block, a sealing ring, a single-layer net, filter sand, an extrusion ring, an edge covering net sheet and a single-layer coarse net sheet which are sequentially arranged in the sand cup; a spring retainer ring is arranged between the fastening ring and the upper cover, and is buckled and pressed on the upper cover by the fastening ring; the spring retainer ring is in a C shape, and holes are formed in the inner sides of C-shaped openings respectively; and two concave cavities are formed in the outer bottom of the sand cup, bosses are arranged on the peripheries of the two concave cavities, and continuous grooves are formed in the upper surfaces of the bosses. According to the spinning assembly for the polyester fibers, an automatic integrated device capable of evenly stabilizing the internal pressure of the assembly is used in the assembly process, it is guaranteed that the residence time of a melt in the assembly body is consistent, the melt fluidity is good, and the temperature difference of the surfaces of spinneret plates is small.

The present invention relates to a hydrolysis reactor, which is used for carrying out hydrolysis on cyanides in desulfurization waste liquids so as to reduce the cyanide content in the desulfurization waste liquid. The hydrolysis reactor comprises a tower body, a skirt, a heater and a waste liquid inlet, wherein the skirt is arranged below the tower body, the bottom portion of the tower body is provided with an emptying port, a waste liquid inlet is arranged above the emptying port and adopts an annular pipe so as to increase the material feeding uniformity, the lower portion of the tower body is provided with a manhole, the heater is arranged inside the tower body, adopts a hosepipe type heater, and is provided with a heating medium inlet and a heating medium outlet, and the top portion of the tower body is provided with a waste liquid outlet. With the hydrolysis reactor of the present invention, the cyanide in the desulfurization waste liquid and the water can be subjected to the hydrolysis reaction to decompose into harmless formate and ammonia, the waste liquid inlet adopts the annular pipe, it is ensured that the retention time of the waste liquid in the tower is the same, the heat exchange is uniform through the hosepipe type heater, and the cyanide hydrolysis reaction is complete.

The invention relates to the technical field of coal slime treatment, in particular to a coal slime solidifying and upgrading process and a device thereof. The process comprises the steps that coal slime cakes are conveyed to a single-shaft spiral stirrer through a scraper machine to be stirred, and the composition of coal slime is improved by adding a certain amount of dehydration auxiliaries and sulfur-fixing agents; the coal slime is formed in the extruding machine and is extruded and molded into a cylinder or a plum blossom shape; molded coal slime is conveyed to the oblique radiation upgrading furnace and dehydrated at 90-150 DEG C, the calorific value can be increased by 1500-2000 kcal/kg, the strength can be increased from 100 N to 1000 N or above, meanwhile, due to the fact that the sulfur-fixing agent is added, SO2 emission in the coal slime is greatly reduced, and the coal slime can be recycled. The inclined radiation upgrading furnace in the coal slime solidification upgrading process comprises a material distribution trolley, a plurality of bin bodies, a heat conduction plate internally provided with a plurality of heat conduction pipes, four discharging openings on each single bin body, and a discharging belt. The coal slime solidifying and upgrading process provided by the invention has the advantages of low cost, capability of remarkably improving the coal slime quality, low dust content, high thermal efficiency and strong feasibility.

The invention relates to the technical field of methods or equipment specially suitable for incinerating waste or low-grade fuel, and discloses a preparation system for preparing floor gypsum powder from construction waste and a use method of the preparation system. Comprising a crushing subsystem for crushing waste gypsum boards into coarse gypsum powder, an airflow sorting device for removing heavy impurities in the coarse gypsum powder, and a cyclone boiler for removing light impurities in the coarse gypsum powder, a discharge port of the crushing subsystem is communicated with a feed port of the airflow sorting device along the conveyor; and a flue gas outlet of the cyclone boiler is communicated with the desulfurization and denitrification device. According to the invention, light impurities and gypsum in the coarse gypsum powder are blown out through the Venturi tube to form a pneumatic conveying mixture with air, and then the mixture is mixed with fuel gas for combustion in the cyclone boiler, so that the removal of the light impurities, the calcination of gypsum particles and the collection of the gypsum particles are completed in one step.