34results about How to "Mild reaction" patented technology

The invention relates to substituted delta-lactones as well as to processes for synthesizing them, e.g., using fatty acids as starting material.

The invention discloses a method for producing a liquid epoxy resin at a low temperature, comprising the following steps: 1) dissolving BPA, ECH, ECH in a molar ratio of BPA:ECH=1:6-12, ECH:dissolving agent=1:0.5-0.7 2) at 25-35 ℃, dropwise NaOH with a mass fraction of 18-30% in the above mixed solution to react, and wait for the reaction Separating and removing brine after finishing, desolubilizing and reclaiming ECH and dissolving agent in the upper oil phase; 3) carrying out negative pressure treatment on the material containing ECH / solvent crude resin to remove ECH / solvent, thereby purifying and purifying the crude resin The epoxy resin is obtained; in the present invention, by introducing a dissolving agent that can be miscible with ECH and water, the reaction becomes mild, the temperature required for the reaction is low, the side reaction generated by the reaction is less, and the phenomenon of local reaction is less, and the overall performance is as follows: No heating is required in the reaction process, the same epoxy equivalent viscosity is low, total chlorine is low, and the generation of aging resin is less.

The invention relates to an organic polyspiralgrid nanopolymer material and a preparation method thereof, and belongs to the field of nanotechnology and organic electronics. The structure of the organic polyspiralgrid nanopolymer material is composed of grids containing a spiro ring that serves as a repeat unit to form a special nano polymer, and the structure shares the spiro ring structure. A synthetic method thereof relates to a synthon containing the spiro ring, and by means of a Friedel-Crafts reaction, an organic spirogrid and a nano polymer thereof are built. By means of reasonable molecular design and the Friedel-Crafts reaction with the advantages of being mild in reaction condition, high in yield, high in selectivity, simple in posttreatment, green, free of toxicity and the like, the problems that a traditional polymer molecule is complex in synthesis step, toxic in posttreatment, large in pollution and the like are solved.

The present invention relates to a method for extracting magnesium and lithium and also producing layered double hydroxides (LDH) from brine, comprising the steps of: adding an aluminum salt to brine, to prepare a mixed salt solution A for preparing MgAl-LDH; adding an alkaline solution to carry out co-precipitation, followed by crystallization; after the crystallization is complete, performing solid-liquid separation to obtain a solid product of MgAl-LDH and a filtrate; concentrating the filtrate by evaporation to obtain a lithium-rich brine, adding an aluminum salt thereto to prepare a mixed salt solution B for preparing LiAl-LDH; adding the mixed salt solution B to an alkaline solution to carry out precipitation; after the precipitation is complete, performing solid-liquid separation to obtain a solid product of LiAl-LDH and a filtrate; and concentrating the filtrate by evaporation, returning the solution concentrated by evaporation to the lithium-rich brine for recycled use. This method uses mild reaction and simple equipment, has a small loss of Li, can achieve isolation of resources from salt lakes, and can also obtain functional materials having a high added value.

The process of recovering chromium from waste electric deposition solution includes adding concentrated sulfuric acid and hydrazine hydrate in certain amount into waste electric deposition solution at 28-32 deg.c to reduce six-valent chromium into trivalent chromium; depositing trivalent chromium with concentrated ammonia water; filtering and washing the precipitate; adding sulfuric acid to dissolve the precipitate, evaporation and stoving to obtain Cr2(SO4)3 crystal. The process has chromium recovering rate over 95 %, and has mild condition, fast speed and no harmful gas produced.

A process of producing oxalate by CO gas phase method includes the following steps: a) introducing nitrite salt, water and an inorganic acid first into a reactor I to produce a NO containing effluent I; and separating the resultant effluent to obtain the effluent II of NO; b) introducing the effluent II of NO, a C1-C4 alkanol and oxygen into a reactor II to be subjected to the reaction, and separating the resultant effluent to obtain the effluent IV of C1-C4 alkyl nitrites; c) introducing the effluent IV of C1-C4 alkyl nitrites and a CO gas stream into a coupling reactor where they are reacted to produce a NO containing effluent VI. The reactor I and / or the reactor II are preferably rotating supergravity reactors. Therefore, the process is applicable to the industrial production of oxalate by CO gas phase method.

A process for preparing cabergoline (I) from ergoline-8β-carboxylic acid ester (XIII) comprising the following steps. (XIII), (XVI), (XVII), (XVIII), (XIX), (I). The present case also relates to the intermediates (XVI), (XVII), (XVIII) and (XIX) as well as the polymorphic amorphous form of Cabergoline (I) and the production thereof.

Disclosed is a method for preparing a borate ester on the basis of a tricyclopentadienyl rare earth metal complex, the method comprising the following steps: uniformly stirring and mixing a catalyst, a borane and a carbonyl compound for reaction to prepare a borate ester, wherein the catalyst is a tricyclopentadienyl rare earth metal complex; and the molecular formula of the tricyclopentadienyl rare earth metal complex can be expressed as: Ln(Cp)3, wherein Ln represents a rare metal selected from one of lanthanide elements. The preparation method has a higher catalytic activity, mild reaction conditions, a product that is easy to post-treat, a short reaction time, a low catalyst consumption amount, and a good range of applicable substrates, and can be used for industrial production.