30results about How to "Long reaction cycle" patented technology

The invention relates to the class of chemical technologies, belongs to the field of solid waste recovery and particularly relates to a method for recovering high-purity metal palladium from an organic waste palladium contained catalyst. The method comprises the steps of waste pretreatment, leaching, extraction, purification and hydrogenation preparation, thereby finally obtaining high-purity metal palladium. The method provided by the invention is simple in reaction step, short in time and capable of saving reagents; in addition, the recovery rate of palladium is up to over 99.2%, and the purity of recovered palladium is higher than 99.98%.

The invention discloses a test paper conveying device and method. The test paper conveying device comprises a bottom plate, a lifting driving mechanism arranged on the bottom plate and a tooth plate arranged on the lifting driving mechanism, wherein two sides of the upper end of the tooth plate are provided with racks for pushing test papers; the rack comprises multiple semi-height teeth arrangedin a spaced mode and full-height teeth arranged at the tail ends of the racks; and the bottom plate is also provided with a horizontal driving mechanism for driving the tooth plate to move horizontally. Through the matched design between the full-height teeth and the semi-height teeth of the racks, in a condition of not changing the whole structure of the device, the purpose of enabling the test speed to be increased or decreased by a test paper reaction period is realized.

The invention relates to the technical field of compound synthesis and in particular discloses a synthetic method of a mercapto functionalized polyaryl carboxylic acid compound. The synthetic method concretely comprises the following steps: in the presence of a palladium catalyst, putting aryl fluoride, aryl boric acid and alkali metal salt serving as raw materials into a mixed system of water/organic solvent, and carrying out a series of subsequent reactions including Suzuki reaction to obtain the mercapto functionalized polyaryl carboxylic acid compound. According to the synthetic method disclosed by the invention, as the Suzuki reaction is realized in the air environment firstly, the reaction condition is greatly simplified, the reaction time is shortened from 2d to 1h, and the productivity and the yield are greatly increased; in addition, by adopting the environment-friendly solvent, the environment is beneficially protected; the mercapto functionalized polyaryl carboxylic acid compound synthesized by utilizing the synthetic method can be largely applied to metal organic compounds to build a series of novel porous materials with novel structures and excellent performances.

The invention discloses a method for preparing biphenyl-4-formyl corey lactone by using a one-pot method. The method comprises the following steps: in a same reaction container, with corey lactone glycol as a raw material, adding a solvent S1 and triphenyl chlorometha to carry out an alkylation reaction in a primary hydroxyl position so as to obtain a solvent S1 reaction system with a corey lactone glycol primary hydroxyl derivative, further adding benzoyl chloride to carry out an acylation reaction in a secondary hydroxyl position, adding a solvent S2, and performing recrystallization so as to obtain a corey lactone glycol double-hydroxyl derivative; adding a solvent S3 and an acid solution to carry out a hydrolysis reaction in a primary hydroxyl position so as to obtain a crude product of biphenyl-4-formyl corey lactone; adding a solvent S4 or/and a solvent S5, and performing recrystallization, thereby obtaining the biphenyl-4-formyl corey lactone with corresponding optical activityat one time. The method is capable of avoiding the situation that materials are repeatedly fed in different steps of tedious reactions, is sufficient in reaction, small in side reaction, high in purity, simple in aftertreatment, high in yield, simple in operation, short in time, high in efficiency, low in material quantity, low in cost and applicable to industrial production.

The invention discloses a hydrolyzed fish collagen processing process. The process includes steps: removing fish scales and fish skin, draining after clearing, and keeping for standby application; soaking the fish scales and the fish skin in water, and performing sterilization treatment; subjecting the fish scales and the fish skin to enzymolysis, filtering, and removing filter residues to obtainenzymatic hydrolysate; feeding the enzymatic hydrolysate into a molecular weight screening system to obtain collagen solutions graded according to collagen molecular weights; concentrating the collagen solutions, drying, and treating with a magnetic rod to obtain fish collagen. The hydrolyzed fish collagen processing process has advantages that before enzymolysis, the fish scales and the fish skinare subjected to high-temperature sterilization to damage tissues in the fish scales and the fish skin, so that acid and alkali swelling treatment can be avoided, enzyme activity can be guaranteed, and enzymolysis completeness is improved; a fish collagen product is free of fishy smell, low in ash content, simple in production process, low in cost, great in taste, high in water solubility and lowin salt content.

The invention discloses an AAO process water treatment equipment, which relates to the technical field of water treatment. It adopts the combination of A/A/0 process and ABR baffle reactor to solve the problem of high nitrogen and phosphorus content in the sewage treatment process of artificial wetlands in rural areas. Sewage treatment is difficult, the backlog of solid suspended matter reduces the service life of constructed wetlands, and the technical problems of low effluent quality. The present invention includes anaerobic compartment A, anaerobic compartment B, anaerobic compartment C, and anoxic compartment in series. , the aerobic compartment A, the aerobic compartment B and the sedimentation chamber, the compartments are separated by a wave-shaped baffle, and the bottom of the aerobic compartment A, the aerobic compartment B and the sedimentation chamber downstream area is provided with a tree Branch-shaped porous aeration head, the tail end of the aerobic compartment B is connected to the anoxic compartment through the pipeline, and the sedimentation chamber is connected to the anaerobic compartment A through the pipeline. , phosphorus effect and volume utilization.

The invention relates to the field of chemical synthesis, and particularly discloses a synthetic preparation method of wintergreen oil. The synthetic preparation method comprises the following steps:(1) methanol, salicylic acid and methyl carboxylate are sequentially put into a reaction kettle according to the molar ratio of (2 to 3):1:(0.1 to 0.3); (2) a synthetic reaction is generated under theconditions of heating and pressurization, and a mixed solution A containing the wintergreen oil is obtained; and (3) the mixed solution A is distilled and separated to obtain the wintergreen oil. According to the method, the defects of a traditional concentrated sulfuric acid catalytic method are overcome, and the methyl carboxylate serves as a catalyst, so that the beneficial effects that raw materials are easy to obtain, the reaction flow is simple, the catalyst can be removed only through simple distillation, subsequent treatment is easy, and the prepared wintergreen oil is large in product purity and high in conversion rate are achieved.

The invention discloses heavy aromatics lightening catalyst. The catalyst comprises a composite carrier and VA group element oxide with the content of 0.5-10.0% by mass calculated based on the composite carrier, and the composite carrier comprises 10-45% by mass of ZSM5 zeolite, 10-45% by mass of EU1 zeolite and 10-80% by mass of aluminum oxide. The catalyst is used for the non-hydrogen lighteningreaction of C9-C12 heavy aromatics, and can obtain higher light aromatic hydrocarbon yield and byproduct propane-rich high-quality liquefied gas.