18results about How to "Reduce water content" patented technology

The utility model relates to the technical field of papermaking mesh production, and discloses a drying device for monofilament papermaking mesh production, which comprises a shell, a cavity is arranged in the middle of an inner cavity of the shell, a motor is fixedly mounted on the rear portion of the inner cavity of the cavity, and a rotating handle is fixedly connected onto an output shaft of the motor through a coupler. The front portion of the rotating handle is movably connected with a traction rod through a shaft, the bottom end of the traction rod is movably connected with a lifting rod through a shaft, the lifting rod is movably connected with the bottom of an inner cavity of the cavity in a sleeved mode, a connecting block is fixedly installed at the bottom end of the lifting rod, and the bottom of the connecting block is movably connected with a stretching roller through a shaft. The stretching roller is driven by the motor to stretch and shake the monofilament papermaking mesh, material shrinkage stress is counteracted, mesh hole blockage and deformation caused by monofilament winding or adhesion are avoided, surface roughness or protrusions are reduced through mesh piece tensioning, the flatness requirement is met, water in the material is migrated through shaking, the water content is reduced, and therefore the needed drying time is shortened. The device working efficiency is improved.

The utility model discloses a fine-grade tailing dehydration device for lead ore processing, which relates to the technical field of tailing dehydration, and comprises a plurality of sedimentation tanks which are communicated with one another, drainage gates are arranged among the sedimentation tanks, and the drainage gates can adjust the height of flowing water between the adjacent sedimentation tanks. The sedimentation tank located at the tail end is communicated with a dehydration device through a water pipe, a water throwing tank is rotationally arranged in the dehydration device, the peripheral side of the water throwing tank is of a latticed double-layer structure, and the double-layer structure of the water throwing tank is filled with a filter element of an annular structure. According to the fine-grade tailing dewatering device for lead ore processing, the dewatering device is arranged, water passing through the sedimentation tank flows into the dewatering device, the water is thrown out after being blocked by the filter element through rotation of the water throwing tank, and tailings are left to be stored in the water throwing tank, so that the water content in the tailings is reduced; and the water can also be poured into the dehydration device to be dehydrated again.

The utility model provides a device and a system for producing an optical fiber preform based on industrial grade D4. The device for producing the optical fiber preform based on the industrial grade D4 comprises a coarse treatment device, a fine treatment device, a low-boiling-point impurity treatment device and a high-boiling-point treatment device which are communicated in sequence, an anion-cation exchange resin membrane and a molecular sieve are arranged in the fine treatment device to remove metal ions and anion impurities in the D4 liquid, the low-boiling-point impurity treatment device is used for separating low-boiling-point impurities in the D4 liquid, the high-boiling-point treatment device is used for separating high-boiling-point impurities in the D4 liquid, and a gas outlet of the high-boiling-point treatment device is communicated with the combustor. According to the device provided by the utility model, the existing commercially available industrial grade D4 is utilized, the adverse effect of gel on deposition production equipment in the D4 gasification process is relieved, the tolerance requirement of the deposition equipment on the purity of the raw material D4 is increased, and the production cost of the optical fiber preform can be reduced.

The application provides a preparation method of a sodium-rich and low-water-content Prussian blue positive electrode material, which comprises the following steps: dissolving sodium ferrocyanide or a hydrate thereof and a complexing agent in deoxygenated water under an inert gas atmosphere and at a certain temperature to obtain a mixed solution A; dissolving a transition metal salt or a hydrate thereof, a sodium supplementing agent, a complexing agent and an auxiliary complexing agent in deoxygenated water under an inert gas atmosphere and at a certain temperature to obtain a mixed solution B; continuously stirring solution A and solution B by dropwise adding them into a container with a positive pressure inert gas atmosphere and at a certain temperature, continuing to stir for a period of time after the dropwise adding is completed, and then standing, centrifuging and vacuum drying to obtain the Prussian blue positive electrode material. The Prussian blue positive electrode material comprises a mixed phase structure of rhombic phases and cubic phases, has the characteristics of high sodium content and low water content. The battery assembled by using the positive electrode material obtained by the method has a theoretical specific capacity close to the theoretical specific capacity under a small current density and still has a high specific capacity under a large current density.

This invention provides an absorbent for capturing carbon dioxide and a method for capturing carbon dioxide. By volume percentage, the absorbent comprises 20-60% glycine salt aqueous solution, 10-50% triethylene glycol monomethyl ether, 5-10% ethylene glycol, and the balance being water. This absorbent combines the advantages of glycine salt systems, such as low volatility, non-toxicity, safety, and better antioxidant degradation resistance, while avoiding the risk of solid precipitates forming after absorption by the glycine salt system, which could cause pipeline blockage.

The application discloses a method for detecting the effect of ground pre-grouting of a vertical shaft by using geophysical logging, before grouting, 1-3 grouting holes are selected and drilled to the designed depth; a geophysical logging system is arranged; the selected grouting holes are subjected to geophysical logging before and after grouting by using the geophysical logging system; the physical properties of the stratum reflected by the geophysical logging data of the grouting holes before and after grouting are compared and analyzed, the change trend of the water conductivity and stability of the grouted stratum is obtained, and the grouting water plugging and reinforcement effect is evaluated. The geophysical logging method is used for detecting the water plugging and reinforcement effect of the ground pre-grouting of a vertical shaft, and a simple and reliable evaluation method is provided, the defects of large hydrological test error and slow excavation measurement lag in the current evaluation method are overcome, the stratum condition information and guidance are provided for the grouting engineering construction, reliable basis is provided for the grouting engineering acceptance, and technical support is provided for the application of the ground pre-grouting technology of a vertical shaft and the safe and rapid construction of a vertical shaft.

This application relates to the field of gas refining production, specifically disclosing a refining process for high-purity electronic-grade ammonia, comprising the following steps: S1, pretreatment: the raw material liquid ammonia is sequentially vaporized, filtered, and adsorbed to obtain crude ammonia; S2, ultrafiltration: the crude ammonia obtained in step S1 is ultrafiltered under conditions of pressure 0.4-0.8 MPa, temperature 25-45℃, and flow rate 1.5-3.5 m / s to obtain high-purity ammonia; S3, distillation and condensation liquefaction: the high-purity ammonia obtained in step S2 is sequentially distilled and condensed to obtain electronic-grade ammonia with a purity of 5N. The refining process of this application simultaneously meets the requirements of high purity, low cost, and high efficiency, improves the removal efficiency of trace impurities, and can obtain electronic-grade ammonia with a purity of 5N, solving the problems of insufficient purity, high impurity content, and high production costs in existing ammonia refining processes.

The invention relates to a method for preparing lactide with different optical purities, belongs to the technical field of lactide preparation, and discloses a method for preparing lactide with different optical purities through multistage depolymerization, lactic acid oligomer is depolymerized, segmentation is carried out at least twice in the depolymerization process to obtain crude lactide with different m-lactide contents, and optionally, the crude lactide is separated from the crude lactide to obtain the lactide with different optical purities. And respectively purifying crude lactide with different contents of m-lactide. According to the invention, mixing of m-lactide and lactide with optical purity is reduced from the source, and lactide with different optical purity can be obtained as required; the method provided by the invention can obtain gt; according to the present invention, the lactide with the optical purity of 96% does not need the separation of m-lactide and L-lactide, such that the amount of the lactide crude product requiring the separation of m-lactide and L-lactide is substantially reduced, and the separation energy consumption is reduced.

The utility model provides a system for preparing a weighting agent for well drilling from industrial carnallite, and relates to the technical field of industrial waste salt recycling, the system comprises a feeding unit, a storage unit, a multi-stage crushing unit, a vacuum drying unit and a vacuum conveying unit, the storage unit comprises a raw material buffer storage bin and a compound medicament bin; the feeding unit is used for feeding materials to the raw material temporary storage bin, and the compound agent bin is used for containing an anti-caking complexing agent; the multi-stage crushing unit at least comprises a first screw conveyor and a crusher which are arranged in sequence, one end of the first screw conveyor is arranged in the raw material temporary storage bin, and the compound medicament bin is located above the first screw conveyor; the vacuum drying unit comprises a drying machine, and the drying machine is arranged between the first spiral conveyor and the crusher; by means of the device, industrial carnallite generated by offshore drilling can be treated, and the purpose that the industrial carnallite is prepared into the weighting agent for drilling is achieved.

This utility model relates to the field of drainage and dredging, and more particularly to a drainage and dredging device for sponge cities, including a base frame and an installation cylinder; the installation cylinder is fixedly connected to the base frame. A partition plate divides the internal space of the support cylinder into two vertically distributed support spaces. A power component allows the upper and lower support spaces to exchange positions, enabling continuous sludge filtration. This avoids the problem in existing technologies where filtration equipment cannot continuously transport sludge, and the next batch of sludge can only be processed after all the sludge in the filtration equipment has been processed and removed, resulting in low sludge treatment efficiency. Simultaneously, the weight of the sludge in the upper support space after the position exchange continuously compresses the sludge in the lower support space after the position exchange, accelerating the filtration speed of water in the sludge in the lower support space and further reducing the water content in the sludge.

The utility model discloses a low energy consumption vinyl chloride water trap, including the separator, the separator is connected with first purifier and waste liquid collection jar through second pipeline and thirteenth pipeline respectively, first purifier is connected with machine front cooler, rectification system and waste liquid collection jar through third pipeline, eleventh pipeline and twelfth pipeline respectively, machine front cooler is connected with machine front separator through fourth pipeline, machine front separator is connected with booster through fifth pipeline, the utility model discloses drying vinyl chloride by adopting temperature swing adsorption technology, reduce the water content among vinyl chloride, and the degree of automation is high, and personnel maintenance quantity is small, and the water molecule separated by temperature swing adsorption is in the form of liquid water and is automatically discharged, and the water is discharged in time, and the water separated by temperature swing adsorption device is neutral, can directly enter the process sewer pipe network, will not cause pipeline and equipment blockage, and the practicality is strong.

This utility model relates to the field of fabric storage technology, specifically disclosing a textile fabric storage rack, including a main body. A rotating door is symmetrically mounted on the surface of the main body, and a cylinder is mounted on the bottom surface of the main body. A moving mechanism is provided inside the main body, comprising: a locking block connected to the end of the output shaft of the cylinder, a support plate connected to the end of the locking block, sliders symmetrically mounted on the end of the support plate, and support blocks symmetrically mounted on the surface of the support plate. A slot is symmetrically embedded in the inner wall of the main body. This textile fabric storage rack, with its moving mechanism, allows fabric to be placed on the surface of the support plate. Simultaneously, the support plate engages with the locking block. At this time, the cylinder pushes the fabric upwards, while the cylinder moves outwards through the locking block. When the locking block engages with the support plate, it causes the support plate to move laterally within the slot, thus placing the support plate and retrieving the fabric.

The utility model discloses a shell type fin heat exchange device for a drying machine, which comprises an outer shell and two fin heat exchangers, the outer shell is respectively provided with an air inlet pipe and an air outlet pipe, and a partition plate is arranged inside the outer shell; according to the device, gas needing to be dried is discharged into the first heat exchange cavity through the gas inlet pipe, the gas is cooled through the fin type heat exchanger in the first heat exchange cavity, water in the gas is cooled and condensed to form water, in this way, the water content of the gas can be reduced, and the gas is discharged through the drainage valve connected with the first heat exchange cavity; and then the cooled gas enters the second heat exchange chamber and is matched with the other fin heat exchanger to heat the gas, and then the gas is exhausted through the gas outlet pipe, so that the gas is dried, meanwhile, in the device, only the fin heat exchanger in the second heat exchange chamber needs to be connected with the compressor, and the other fin heat exchanger does not need to be connected with the condenser; therefore, parts such as a condenser and a fan are reduced, and the cost is reduced.

The utility model discloses a heat dissipation cooling system for a high-temperature mine, which comprises a front-end refrigeration unit, a middle-section refrigeration unit, an air supply pipe, a plurality of groups of cooling units, a liquid supply pipe and a circulating pipe, the front-end refrigeration unit is arranged on the ground surface, the middle-section refrigeration unit is arranged on the middle-rear section of the mine, and the liquid supply pipe is arranged in the middle-rear section of the mine. The cooling units are arranged in mining areas of the rear section of a mine and attached to the inner wall of the mine, the front-end refrigeration unit is sequentially connected with the middle-section refrigeration unit and the cooling units through air supply pipes, and the middle-section refrigeration unit is further connected with a cold source through a liquid supply pipe and a circulating pipe. The device is compact in layout in a mine, small in occupied area, stable in ventilation and high in air quality, the air temperature in the mine is always kept below 30 DEG C, the problem of heat damage can be effectively solved, the production operation environment is improved, and the occupational health of underground mine operation personnel is guaranteed.

The invention belongs to the field of chemical raw materials, and discloses a method and a system for preparing a low-water-content sodium sulfide / NMP (N-Methyl Pyrrolidone) mixture by dehydrating sodium sulfide and application. The method comprises the following steps: at a target dehydration temperature, continuously adding a sodium sulfide aqueous solution into NMP at a preset flow rate, in the process, removing a part of a material containing water, NMP and hydrogen sulfide from a dehydration kettle, with the addition flow rate of the sodium sulfide aqueous solution being equal to the amount of water removed from the dehydration kettle at the target dehydration temperature; after the sodium sulfide aqueous solution is added, returning materials in the dehydration tower to the dehydration kettle to obtain the low-water-content sodium sulfide / NMP mixture; optionally, the previous steps are repeated. The method provided by the invention has the advantages of high dehydration efficiency, good stability, low water content, small difference between water content and sulfur source content in low-water-content sodium sulfide / NMP mixtures in different batches, and stable quality, and provides good raw material support for obtaining high-quality polyphenylene sulfide, wherein the water / sulfur molar ratio in the dehydrated sodium sulfide / NMP mixture is less than or equal to 1, and the difference between water content and sulfur source content in the low-water-content sodium sulfide / NMP mixtures in different batches is small.

The invention belongs to the technical field of PBT (polybutylene terephthalate) resin processing, and particularly relates to a high-cleanness PBT resin which is prepared from the following components in percentage by weight: 80-92% of 1, 4-butanediol and 1-5% of catalyst, 0.1-1.2% of chain extender, 2-3% of plasticizer and 1-2% of PET (polyethylene terephthalate) by mixing 1, 4-butanediol and PTA according to a molar ratio of (1-1.1): (1.1-1.3) as a base material, the preparation method comprises the following steps: adding a catalyst to carry out esterification reaction, processing a PBT adhesive material in a final polycondensation kettle, adding a chain extender, a plasticizer and PET, circularly drying, and granulating to obtain a high-cleanness PBT product. According to the invention, 80-92% of 1, 4-butanediol and PTA, 1-5% of a catalyst, 0.1-1.2% of a chain extender, 2-3% of a plasticizer and 1-2% of PET are utilized, the catalyst is firstly added to carry out an esterification reaction, then a PBT adhesive material is processed in a final polycondensation kettle, then the chain extender, the plasticizer and PET are added, and the mixture is subjected to circular drying and pelletizing to finally obtain a high-cleanness PBT product, and the PBT has the advantages of good slice color value, low water content and low THF content.

This utility model provides a vacuum treatment device based on membrane contactor deoxygenation technology, relating to the field of membrane contactor deoxygenation technology. It includes: a fixed frame, with a vacuum treatment mechanism mounted on top of the fixed frame. The vacuum treatment mechanism includes a Roots pump, a water ring pump, a gas connection pipe, and a steam outlet pipe. A gas-liquid separation mechanism is also mounted on top of the vacuum treatment mechanism, including a steam outlet pipe, a separation container, an inlet baffle, a wave deflector, an exhaust pipe, a drain pipe, an internally threaded fixed pipe, a threaded connection pipe, a filter pipe, and an activated carbon filter element. This utility model uses a combination of a Roots pump and a water ring pump for vacuum treatment, eliminating the need for a traditional single pump body. This ensures a high vacuum level even at high water temperatures in summer, while reducing energy consumption under the same vacuum requirements. The detachable filter pipe facilitates secondary filtration and allows for easy replacement and disassembly of the filter pipe.

The invention relates to the technical field of high-purity chemicals, and provides a preparation method of high-purity propylene glycol methyl ether acetate. The method comprises the following steps: mixing propylene glycol monomethyl ether, acetic acid and a catalyst to carry out a first-stage reaction, mixing the obtained first reaction liquid with alkali metal to carry out a second-stage reaction, and rectifying the obtained second reaction liquid to obtain the high-purity propylene glycol methyl ether acetate. The alkali metal is added into the reaction liquid obtained in the first-stage reaction, so that the acidity of the product can be reduced, and the key problem that the acidity is relatively high in an esterification synthesis route of propylene glycol methyl ether acetate is solved; unreacted propylene glycol monomethyl ether can be converted into propylene glycol monomethyl ether alkali metal salt with a relatively high boiling point, and the separation difficulty of impurities and a target product can be reduced in subsequent rectification; in addition, hydrolysis of the generated propylene glycol methyl ether alkali metal salt can further promote esterification reaction. The method provided by the invention is simple in required rectification device, high in product purity, low in water content and wide in prospect.