4results about How to "Simplified post-processing steps" patented technology

The invention relates to a method for improving the activity of heavy magnesium oxide. According to the method, through the fine process steps of secondary cold water stirring, secondary time and temperature adjustment drying, primary calcination and the like, the activity of the heavy magnesium oxide is remarkably improved under the condition that the bulk density, the granularity and the crystal structure of the heavy magnesium oxide are not affected, and the active CAA value is increased from 500 seconds or above to 10 seconds to 185 seconds. In the whole preparation process, through reasonable selection of raw materials and accurate control of reaction conditions, high activity and excellent filling performance of magnesium oxide are realized, and finally, a high-performance magnesium oxide product suitable for various industrial applications is obtained. The method has the characteristics of simple process, environmental protection, high efficiency and low energy consumption, is especially suitable for large-scale production, and has wide application prospects in cobalt precipitation, sewage treatment and other industrial fields.

The invention relates to a preparation method of nicardipine hydrochloride, and belongs to the technical field of medicines. Different from the previous reported reaction under an alkaline condition in the synthesis of nicardipine, the method disclosed by the invention has the advantages that the reaction is carried out under an acidic condition, the reaction is milder, the rate is higher, and the nicardipine solid with higher purity can be obtained through post-treatment. The nicardipine hydrochloride with high purity can be obtained by reacting nicardipine with hydrochloric acid to form salt and crystallizing, and the method is suitable for industrial production.

The application relates to the technical field of oil field chemistry, and discloses a kind of Gemini imidazoline clay stabilizer and its preparation method.The clay stabilizer is a quaternary ammonium salt with a specific general structure: wherein the number of carbon atoms n of alkyl chain is 6-11, preferably 7, 8 or 9.The preparation method includes two steps of quaternization reaction: first, 1-(3-aminopropyl) imidazole is heated and refluxed with halogenated alkane in a solvent to obtain an intermediate, and then the intermediate is reacted with halogenated alkane again to obtain the target product.The product shows excellent performance at a low concentration of 0.1%: anti-swelling rate of 87.9%-91.4% at room temperature, water washing resistance of 94.8%-96.8%, small damage to formation permeability, and permeability change rate of only 3.5%-5.1%.The structure of the double quaternary ammonium salt center and the double medium-chain alkyl group realizes efficient adsorption and stable hydrophobic film formation, solving the problem that the prior art cannot simultaneously achieve high efficiency, long-acting and low damage.The method is simple in process and suitable for large-scale production.

This invention relates to the field of fluorescence sensing materials technology, specifically to a biporous cationic covalent organic framework material, its preparation method, a ratiometric fluorescent probe, and its applications. The unit cell parameters of the biporous cationic covalent organic framework material are: a = 72.3305 Å, b = 72.3305 Å, c = 3.7877 Å, α = β = 90.000°, γ = 120.000°; its structure is shown in Formula I. This invention utilizes the strong electrostatic interaction between the nanoscale pore wall ion sites of the biporous cationic covalent organic framework material and the charged groups of fluoroquinolone antibiotics, combined with a spatial matching effect, to achieve highly selective recognition of FQs.