4results about How to "Less by-products" patented technology

This invention relates to a method for preparing a water-soluble yellow reactive dye, comprising: adding water and ice to 2-naphthylamine-3,6,8-trisulfonic acid and slurrying, followed by a diazotization reaction to obtain a diazo material; adding water and ice to m-ureidoaniline, adding an alkali agent, and stirring to dissolve and obtain a clear m-ureidoaniline solution; adding the diazo material to the clear m-ureidoaniline solution and performing a coupling reaction at a controlled temperature to obtain a yellow base; adding water and ice to cyanuric chloride, adding dispersant CS and dispersant MF and slurrying, then adding sodium 2,4-diaminobenzenesulfonate and mixing and slurrying, with staged heating and pH adjustment to react and obtain a bicondensed material; adding the yellow base to the bicondensed material, heating and adjusting the pH, and performing a controlled reaction to obtain a dye slurry. The preparation method provided by this invention features high chroma conversion rate, short production cycle, and reasonable and efficient process, resulting in a product with excellent solubility, high fixation rate, good storage resistance, and bright color.

The invention belongs to the technical field of organic pollutant degradation, and particularly relates to a CuFe2O4 modified catalytic ceramic membrane as well as a preparation method and application thereof. A preparation method of a CuFe2O4 modified catalytic ceramic membrane comprises the following steps: uniformly mixing and dissolving a copper salt, an iron salt and a gelling agent to obtain a copper ferrite sol state mixed solution; and putting the ceramic membrane into the copper ferrite sol state mixed solution, and sequentially carrying out dipping, drying and calcining treatment to obtain the CuFe2O4 modified catalytic ceramic membrane. The copper ferrite spinel material disclosed by the invention is uniformly fixed on the surface and in pore channels of the ceramic membrane through a dipping-drying-low-temperature calcining process, so that firm combination with a matrix is ensured, and the copper ferrite spinel material has the advantages of low metal dissolution, stable performance and recyclability in a reaction process; the secondary pollution risk caused by metal ion loss in traditional heterogeneous catalysis is avoided, and the application characteristics of high efficiency, low byproduct and strong stability are comprehensively embodied.

The application provides a preparation method of 3-hydroxypropionitrile, and belongs to the technical field of fine chemical preparation. The preparation method comprises the following steps: 1) mixing water, an alkali catalyst and an inorganic salt to obtain a mixed solution; the salt concentration in the mixed solution reaches a saturated or supersaturated state; 2) under stirring, adding acrylonitrile into the mixed solution to perform a hydration reaction; during the reaction, the generated 3-hydroxypropionitrile continuously precipitates from the aqueous phase under the action of salting-out effect, and an independent oil phase is formed; and 3) after the reaction is completed, the oil phase is separated to obtain 3-hydroxypropionitrile. The method provided by the application does not use an organic solvent, the process is simple, the product has high yield and good purity.

The application belongs to the technical field of polyether preparation, and discloses a solid superbase catalyst and a method for preparing isomeric alcohol polyether by using the same. The solid superbase catalyst comprises a catalyst carrier and a strong base loaded on the catalyst carrier; the strong base is at least one selected from CH3OK, CH3ONa, KOH and NaOH; and the catalyst carrier comprises one of MgO, ZrO2 and Al2O3. The solid superbase catalyst provided by the application is composed of a catalyst carrier and a strong base loaded on the catalyst carrier, and has high catalytic activity and high reaction efficiency. When the solid superbase catalyst is used as a catalyst, isomeric alcohol polyether with low odor, narrow molecular weight distribution and few by-products can be prepared.