14results about How to "Avoid thermal decomposition" patented technology

This application discloses an acetaldehyde recovery device and method in the production of 1,3-butanediol, belonging to the field of fine chemicals. The device includes: a feed pump, a preheater, a distillation column, a falling film reboiler, a bottom circulating pump, a bottom cooler, a top primary condenser, a reflux ratio distributor, a top secondary condenser, a top product tank, a top transfer tank, a bottom product tank, a bottom transfer tank, a vacuum condenser, a vacuum pump inlet separator, a high vacuum unit, and a vacuum pump outlet separator. The horizontal condenser is directly installed at the top of the distillation column, giving it advantages such as simple structure, convenient operation, low pipeline loss, and high vacuum. A method for acetaldehyde recovery in the production of 1,3-butanediol using this device is also disclosed. Compared to existing technologies, this invention uses falling film evaporation combined with vacuum deep cooling, which avoids the thermal decomposition of 3-hydroxybutyraldehyde and achieves low-temperature, high-efficiency acetaldehyde recovery. It is suitable for continuous production.

The invention provides an optical module and a welding method applied to the optical module. The optical module comprises a circuit board, a first device and a second device. A first bonding pad and a second bonding pad are formed on the surface of the circuit board. A first connecting layer is arranged on the surface of the first bonding pad. The first device is fixed on the surface of the first connecting layer through welding, so that the first device is fixed on the surface of the circuit board. A second connecting layer is arranged on the surface of the second bonding pad. One end, close to the second connecting layer, in the second bonding pad contains a permeable layer; and the permeable layer comprises a second welding medium. It can be seen that the components of the second bonding pad and the second connecting layer both comprise the second welding medium, so that the fusion performance at the interface position between the second bonding pad and the second connecting layer is high, the chemical bonding force is large, the situation that cracks appear at the interface position between the second bonding pad and the second connecting layer is reduced, and the service life of the second bonding pad and the second connecting layer is prolonged. And the welding connection force between the second bonding pad and the second connection layer is ensured, so that the welding quality of the second device is improved.

The application discloses a kind of to promote the baking process of grade tobacco quality in Yunyan 87, including the following steps: furnace, yellowing period, color fixing period, dry tendon period and grading screening;The baking process is controlled using the linear heating rate of 0.9~1.2℃ / h throughout;The dry tendon period uses moderate reduction dry tendon stage dry ball baking temperature, avoids the thermal decomposition and volatile loss of tobacco heat-sensitive aroma precursor caused by high-temperature long-time dry tendon baking, effectively retains the internal aroma active substance of tobacco.At the same time, the application clearly distinguishes the high-temperature layer and low-temperature layer of airflow ascending and airflow descending type curing barn, and standardizes the key links such as tobacco harvesting maturity, pole coding and furnace loading density, and rain day tobacco pretreatment, so that the upper and lower layers of whole kiln tobacco are evenly dried, the color is consistent, and the oil content is sufficient.

The utility model belongs to the technical field of separation devices, and particularly relates to a dioctyl terephthalate distillation system which comprises a distillation tower, a plurality of tower plates arranged in the distillation tower, a heat exchanger connected to the bottom of the distillation tower, a product storage tank connected to the top of the distillation tower and a stirring assembly arranged in the distillation tower, the stirring assembly comprises a stirring paddle and a spiral stirrer, the stirring paddle is located at the bottom of the distillation tower, a plurality of corrugated plates and a plurality of flow guide covers are arranged in the distillation tower, the corrugated plates are located above the flow guide covers, and the flow guide covers are located above the stirring paddle. According to the utility model, the space in the distillation tower is divided into three parts according to functions, and each section adopts a proper internal component, so that the optimization of the distillation effect is realized.

This invention relates to the field of flame-retardant polymer materials technology, specifically a process for preparing high-temperature flame-retardant PC / ABS alloy resin modified with maleic anhydride-grafted POE. The modification of PC / ABS alloys to achieve high heat resistance and halogen-free flame retardancy often presents the technical challenge of synergistically improving heat resistance, toughness, and flame retardancy. This invention employs a synergistically optimized preparation process. A specific step-feeding melt-blending extrusion strategy is used, where PC and heat-resistant ABS, with maleic anhydride-grafted POE as the core compatibilizer, are melt-blended. After sufficient plasticization and the initial formation of a stable phase structure, a heat-sensitive halogen-free phosphorus-based flame retardant and an anti-dripping agent are injected. This avoids premature decomposition and failure of the flame retardant at high temperatures, ensures sufficient reaction of POE-g-MAH at the PC / ABS phase interface, optimizes the dispersed phase morphology, enhances the low-temperature impact toughness and stress cracking resistance of the PC / ABS alloy resin, and solves the material brittleness problem caused by the introduction of flame retardants.

The utility model discloses a PVC electric power pipe plastic production material drying device which comprises an inner barrel and an outer barrel, the inner barrel and the outer barrel are coaxially arranged, a plurality of filter holes are formed in the inner barrel, a transmission mechanism is arranged between the inner barrel and the outer barrel, an air inlet pipe is arranged in the center of the top of the inner barrel, the lower end of the air inlet pipe is communicated with the interior of the inner barrel, and the upper end of the air inlet pipe is communicated with the interior of the outer barrel. A heating wire is arranged in the air inlet pipe, a draught fan is arranged at the position, located above the heating wire, of the air inlet pipe, the draught fan is arranged on the outer barrel, external air is conveyed into the inner barrel through the air inlet pipe through the draught fan, the air is heated through the heating wire during conveying, and hot air flow is formed and enters the inner barrel to dry production raw materials. Meanwhile, by matching with the condition that the inner barrel drives the production raw materials to rotate at a high speed, the contact area between the production raw materials and hot air flow is effectively increased, the drying efficiency is further improved, and the situation that in the prior art, due to direct heating of an electric heating strip, local overheating is easily caused, and thermal decomposition of PVC particles is possibly caused is avoided.

This application provides a composite solid electrolyte comprising a polymer matrix, a metal salt, and fast-ion conductor ceramic particles. Both the metal salt and the fast-ion conductor ceramic particles are dispersed within the polymer matrix. The fast-ion conductor ceramic particles are sequentially coated from the inside out with an inorganic oxide layer and a fluorinated silane coupling agent. The fluorinated silane coupling agent is chemically bonded to the inorganic oxide layer. This application also provides a method for preparing the composite solid electrolyte. Through both material and process innovation, this application prepares a composite solid electrolyte with high dispersibility, high ionic conductivity, and high interfacial compatibility.

This invention discloses a device for detecting down composition and residual fat content, comprising a controller, a composition detection mechanism, and a sample dispersion mechanism, a microwave extraction mechanism, and a drying and weighing mechanism connected in sequence. The sample dispersion mechanism includes a sample chamber and a dispersion cavity. A miniature electromagnetic vibrator is installed at the bottom of the sample chamber, with its top surface inclined to the dispersion cavity. The dispersion cavity is a transparent cavity with an air outlet, an air inlet, and a telescopic rod A. A mesh sieve plate is fixed to the top of the telescopic rod A, and a sample recovery port is located above the sieve plate. The composition detection mechanism is connected to the dispersion cavity. The controller connects to each component. This invention achieves integrated automatic detection of down composition and residual fat content by integrating composition detection, microwave extraction, and drying and weighing. It replaces Soxhlet extraction with microwave extraction, significantly shortening the residual fat detection time and reducing the amount of organic solvent used. Through automatic dispersion, sieving, and optical analysis, it reduces manual intervention and improves the efficiency, objectivity, and repeatability of composition analysis results.

The invention provides a high-yield clean synthesis process of thiamethoxam, and relates to the technical field of pesticide fine chemical synthesis, and the process mainly comprises the following steps: Sp1, destroying crystal lattices of 3-methyl-4-nitroimido-perhydro-1, 3, 5-oxadiazine by using an ultrasonic cavitation technology, forming a low-temperature high-activity suspension in the presence of micronized inorganic base, and breaking through the bottleneck of solid-liquid mass transfer; the preparation method comprises the following steps: constructing an efficient nucleophilic system by using a quaternary ammonium salt and open-chain polyether composite catalyst; 2-chloro-5-chloromethylthiazole is introduced by adopting a two-way gradient feeding strategy combining low-temperature slow dropping and high-temperature fast dropping, reaction kinetics is accurately controlled, and decomposition of heat-sensitive raw materials is effectively inhibited; sp4, cleaning post-treatment is achieved through hot filtration desalination, mother liquor circulation and solvent recovery. The method effectively solves the problems of low yield and more impurities in the traditional high-temperature process, the molar yield of thiamethoxam can be stabilized at 96% or above, the product purity is high, the whole-process clean production is realized, and the method has remarkable industrial application value.

The utility model discloses a solid-phase post-polymerization device for bio-based polyamide. The solid-phase post-polymerization device comprises a kettle body, a supporting structure and a rotary driving structure, a reaction chamber for solid-phase polymerization of bio-based polyamide is arranged inside the kettle body; the supporting structure is supported below the kettle body so that the lower part of the kettle body is suspended; the supporting structure is rotationally connected with the kettle body; the rotary driving structure is connected with the kettle body and drives the kettle body to rotate relative to the supporting structure; the kettle body further comprises a temperature control system for controlling the temperature in the reaction chamber, a vacuum system for controlling the pressure in the reaction chamber and a sampling device, the reaction temperature in the reaction chamber is 5-40 DEG C below the melting point temperature of the bio-based polyamide, and the sampling device comprises a flow guide pipe communicated with the inside and the outside of the kettle body and multi-stage control valves connected in series along the flow guide pipe. The reaction kettle has the advantages that the problems of adhesion of high-viscosity fluid to the inner wall of the kettle body and stirring are solved, a material sample can be obtained in real time for testing, and PDI of bio-based polyamide is reduced.

This invention relates to a composite sodium-replenishing material, its preparation method, an electrode, and a battery. The composite sodium-replenishing material comprises a matrix, a sodium-replenishing agent body, and a conductive reinforcement. The matrix is ​​porous carbon fiber; the sodium-replenishing agent body is distributed on the surface and within the pores of the matrix; the conductive reinforcement is partially embedded within the sodium-replenishing agent body and partially located on its outer surface. The preparation method of the composite sodium-replenishing material includes the following steps: hydrothermal treatment of a dispersion; the dispersion comprises porous carbon fibers, sodium salt, and a conductive reinforcement. The composite sodium-replenishing material of this invention can improve the initial efficiency and capacity retention of sodium-ion batteries.

The utility model discloses an XPS (extruded polystyrene) extruded sheet waste crushing and recycling device, which belongs to the technical field of waste recycling and comprises a crushing shell with a crushing cavity inside, the top of the crushing shell is communicated with a feed hopper, the bottom of the crushing shell is provided with a discharge port, and a grading crushing mechanism with a screening function is arranged in the crushing cavity. And meanwhile, a cooling mechanism used for controlling the temperature of the graded crushing mechanism is arranged in the crushing cavity, a granulation mechanism communicating with the discharging opening is arranged at the bottom of the crushing shell, and a waste gas treatment system is connected to the granulation mechanism. The waste material crushing device can crush waste materials in a grading manner, so that the qualified waste materials are prevented from being repeatedly crushed to generate excessive powder; and meanwhile, the crushing rollers can be cooled in the crushing process, and the temperature of the crushing rollers is prevented from being too high.

This invention provides a method for purifying hydrogen peroxide based on an ultra-clean, high-purity hydrogen peroxide preparation system, comprising the following steps: Industrial-grade hydrogen peroxide feedstock is pumped to a front-end precision filter via a first pressurized pump for filtration, and the feedstock is collected in a first storage tank; it is then pumped to a first cooling heat exchanger via a second pressurized pump for heat exchange, and subsequently passed through a first-stage reverse osmosis module for separation, with the desalinated water collected in a second storage tank, and a portion of the concentrate returned to the first storage tank, while the remaining portion is passed through a concentrate reverse osmosis module for separation; the desalinated water produced by the concentrate reverse osmosis module is returned to the first storage tank; the feedstock in the second storage tank is subjected to heat exchange, and then passed through a second-stage reverse osmosis module for separation, with the desalinated water collected in a third storage tank, and the concentrate returned to the first tank; the feedstock in the third storage tank undergoes ion exchange and adsorption treatment, followed by filtration to obtain ultra-clean, high-purity hydrogen peroxide. This invention achieves safe, continuous, and efficient purification of hydrogen peroxide under ambient temperature and pressure conditions.

This invention discloses a method for extracting polyphenols and flavonoids from banana taro residue, stems, leaves, and fine roots, belonging to the field of natural active substance extraction technology. The method uses banana taro processing by-products (residue, stems, leaves, and fine roots) as raw materials, and involves pretreatment, ultrasonic-assisted enzymatic hydrolysis extraction, centrifugal filtration, macroporous adsorption resin purification, vacuum concentration, and vacuum freeze-drying to simultaneously obtain high-purity polyphenol and flavonoid extracts. This invention features a mild and efficient process, high extraction rate, and complete preservation of active ingredients, achieving high-value comprehensive utilization of banana taro by-products. It is environmentally friendly, suitable for industrial production, and the obtained products can be widely used in food, health products, cosmetics, and pharmaceutical fields.