7results about How to "Moderate reaction temperature" patented technology

The invention belongs to the field of medicine synthesis, and particularly relates to a nitration method of an indole derivative. According to the invention, acetonitrile is taken as a solvent, indole or substituted indole is taken as a substrate, copper nitrate trihydrate is taken as a nitration reagent, paratoluensulfonyl chloride is taken as an accelerant, and a series of 3-nitroindole derivatives are obtained under mild conditions in a simple and high-yield manner. The synthesis method disclosed by the invention has the characteristics of easily available raw materials, wide substrate application range, short reaction time, simplicity in operation, easiness in amplification and the like.

The present application belongs to the technical field of natural product chemical modification, and particularly relates to a chemically modified rare ginsenoside derivative, a preparation method and application thereof. The present application takes rare ginsenoside as raw material, introduces a sulfate group by sulfating modification on the rare ginsenoside to obtain a chemically modified rare ginsenoside derivative; the modifier used in the sulfating modification is a sulfonating agent. The rare ginsenoside is synthesized by conversion with ginsenoside Rb1 as raw material and AlCl3 as catalyst in an ethanol system. The modification method of the present application is simple in operation steps, does not require special equipment, is suitable for large-scale production, and has a broad application prospect in the field of drug preparation development and the like.

The invention discloses a preparation method of 2-methyl-4-aminoquinoline, and belongs to the technical field of organic synthesis. The preparation method comprises the following steps: by taking 2-methylquinoline as a raw material, carrying out nitrogen oxidation reaction under the action of 3-chloroperoxybenzoic acid (mCPBA) without purification; then carrying out nitration reaction in iron nitrate nonahydrate and isopropanol; then, under the tetrahydroxy diboron / alkaline condition, 2-methyl-4-aminoquinoline is generated through reduction. Easily available 2-methylquinoline is adopted as a raw material, nitrogen oxidation is performed, a ferric nitrate nitration system is adopted, and finally amino is introduced through reduction, so that harsh conditions in a traditional method are avoided, the route is simple and efficient, product separation and purification are simple, and the method is suitable for being carried out under industrial amplification conditions.

This invention relates to the field of air pollution control technology, specifically a high-temperature flue gas emission desulfurization and denitrification device, comprising a denitrification mechanism and a desulfurization mechanism. The denitrification mechanism employs a vacuum-jacketed mounting cylinder, which contains an array of denitrification arc-shaped guide holes and a combined denitrification module. The module includes a denitrification guide cylinder, an arc-shaped filter screen, and a limiting guide cylinder with oblique guide grooves, effectively expanding the catalytic area and uniformly distributing the flow. A back-blowing fan and an elastically limiting rotating guide plate are also included to achieve online vibration self-cleaning. The desulfurization mechanism introduces flue gas into the desulfurization mounting cylinder through a gradient annular guide cylinder and uniformly enlarging inlet holes from top to bottom, forming a gradient three-dimensional desulfurization. A bottom discharge drive and a spiral guide plate ensure uniform catalyst renewal. This device has a compact structure, excellent insulation and airflow organization, and solves problems such as ash accumulation and blockage, difficult maintenance, and low catalyst utilization in existing technologies, thus improving denitrification and desulfurization efficiency and continuous operation stability.

The utility model discloses a novel heat exchange device for unsaturated polyester resin production, which comprises a reaction kettle, the upper end of the reaction kettle is fixedly provided with a feed pipe, the lower end of the reaction kettle is fixedly provided with a discharge pipe, and the left side and the right side of the upper side of the outer surface of the reaction kettle are respectively and fixedly communicated with a heat exchange pipe and an exhaust pipe. A motor is fixedly mounted at the upper end of the reaction kettle, a plurality of stirring rods are fixedly mounted on an output shaft of the motor, and an air cylinder is fixedly mounted on the right side of the upper end of the reaction kettle. According to the technical scheme, the novel heat exchange device for unsaturated polyester resin production is provided. Three-dimensional stirring is realized through the synergistic effect of the stirring rods and the annular plates, flowing dead angles are eliminated, all materials are ensured to be in full contact with a heat exchange medium, the uniformity of the materials is improved, the materials in the reaction kettle can be ensured to reach a proper reaction temperature, and the curing degree and the crosslinking density of resin are improved, so that the product quality is improved.

The invention discloses a high-end healthy protective fabric processing technology and equipment, and belongs to the field of fabric processing equipment. The problems that when existing fabric processing equipment is used for soaking, solution circulation is poor, raw material reaction is uneven, the solution temperature is difficult to control, impurities are prone to blockage, and much solution is wasted during dehydration are solved. According to the technical scheme, the top of a solution barrel is fixedly communicated with a top barrel, two symmetrical air cylinders are arranged on the outer wall of the solution barrel, air cylinder piston rods are connected with a fixing frame, a motor is installed on the fixing frame, and a motor output shaft is connected with a driving shaft which slidably penetrates through the top barrel and is connected with a soaking barrel with a hole and a blocking cover; a heat exchange cover with a heating wire is arranged on the inner wall of the bottom of the solution barrel; a blow-off pipe with filter holes and spiral pushing blades is arranged on the side of the solution barrel, a rotating shaft with stirring blades and a positioning assembly are arranged at the bottom of the soaking barrel, and the top barrel is matched with the soaking barrel to achieve dehydration. The method is mainly used for preparing high-end healthy protective fabric, reaction uniformity and processing quality can be improved, and solution waste is reduced.

This invention provides a rapid reaction device for qPCR detection reagents, belonging to the field of biotechnology. It includes a housing with a temperature control component on one side and a reagent placement component on the top. Through the temperature control component, the fins, acting as efficient heat exchangers, rapidly absorb and release heat. When hot air passes through the fins, heat is quickly transferred to the entire inner chamber, raising the internal temperature. When cold air passes through, the fins absorb heat and transfer it to the cold air, thus lowering the internal temperature. The combination of hot and cold air blowers and the fins allows for rapid response to temperature regulation needs, achieving precise temperature control within the housing, meeting the requirements of rapid qPCR detection reagent reactions, and improving detection efficiency.