2results about How to "Simplified post-processing steps" patented technology

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.