7results about How to "Highly selective separation" patented technology

The application belongs to the technical field of natural substance separation and extraction, and particularly relates to a kind of Haematococcus pluvialis multi-product cascade separation method based on eutectic solvent sequential extraction and enzyme membrane reactor coupling, comprising the following steps: (1) cell wall weakening pretreatment step; (2) water-soluble component extraction step; (3) pigment component extraction step; (4) astaxanthin extraction step; (5) enzyme conversion step. Through the synergistic effect of eutectic solvent sequential extraction and enzyme membrane reactor, efficient, green and continuous cascade separation of water-soluble components, pigments, astaxanthin and xylo-oligosaccharides in Haematococcus pluvialis is realized, and product purity and resource utilization are improved.

The application relates to the technical field of membranes, in particular to an antibacterial nanofiltration membrane and a preparation method thereof. The method comprises the following steps: polyethylene imine / tannic acid pretreatment is carried out on a polyethersulfone sulfone ultrafiltration membrane substrate; first interfacial polymerization of a water phase containing piperazine, guanidino butylamine sulfate and taurine and an organic phase containing trimesoyl chloride is sequentially carried out; secondary water phase back immersion is carried out by using a taurine solution; a cross-linking anchoring agent with 20%-22% maleimide double bonds is prepared; the cross-linking anchoring agent is used for anchoring-densification treatment together with trimesoyl chloride; and finally, acid / alkali alternation and heat curing are carried out. Through unique step design and function component synergy, a stable antibacterial and anti-pollution structure is constructed in the separation layer, and the problems of easy biological pollution and easy loss of antibacterial agents of traditional nanofiltration membranes are solved. The obtained membrane has long-acting antibacterial property, high flux recovery rate, high ion selectivity and excellent acid / alkali cycle stability.

The invention provides a preparation method of a chiral porous organic cage membrane and application of a chiral separation membrane based on a chiral porous organic cage in enantiomer separation. The preparation method comprises the following steps: dispersing chiral porous organic cage crystals in a polymer solution to obtain a membrane casting solution; the chiral porous organic cage crystal is formed by condensation polymerization of a chiral diamine monomer and an aldehyde monomer; and forming the chiral porous organic cage membrane from the membrane casting solution in a phase inversion manner. The chiral porous organic cage membrane for enantiomer separation is prepared on the basis of the chiral characteristic and solution processability of POCs. The prepared chiral POCs-based chiral separation membrane can realize high-selectivity separation of racemic mixtures with different concentrations in different solvent systems, and especially can realize high-efficiency enantioselective separation of racemic mixtures of chiral drug key intermediates with different concentrations.

The present application relates to adsorption separation of bisphenol A and 2,4-bisphenol A adsorbent and its adsorption separation process; the adsorbent is a high-silicon Y molecular sieve containing rare earth, the molar ratio of the contained silicon oxide and aluminum oxide is 2.5:1-15:1, the contained rare earth metal is one or a combination of multiple of lanthanum, cerium, scandium and yttrium, the content of rare earth metal is 10:1-1000:1 in terms of the molar ratio of silicon and rare earth metal, and the rare earth metal exists in the form of metal ions. The adsorption separation process is to contact the mixture containing bisphenol A, 2,4-bisphenol A, triphenol and chroman in the crystallization mother liquor with the adsorbent in the adsorption separation reactor to carry out adsorption separation, and the obtained bisphenol A and 2,4-bisphenol A after adsorption separation enter the isomerization reaction unit; the obtained triphenol and chroman after adsorption separation enter the cracking reaction unit. Phenol is used as the eluent, has strong affinity with the adsorbent, and the elution efficiency reaches more than 95%.

The application relates to the field of chemical separation technology, and discloses a biomass-based carbon molecular sieve with high acetylene / ethylene selectivity and a preparation method and application thereof. The method mainly comprises the following steps: dispersing sucrose, a nitrogen-containing organic small molecule and a trace amount of inorganic acid in an aqueous solution, and then transferring to a reaction kettle to perform self-assembly in a closed environment. The carbon precursor is placed in a temperature control tube furnace, pyrolysis carbonization is carried out in a temperature range of 500-900 DEG C under the protection of an inert atmosphere, and through the synergistic effect of a thermal decomposition reaction and a thermal polycondensation reaction, a biomass-based carbon molecular sieve material is synthesized. The carbon molecular sieve material prepared by the application is stable in structure, simple in preparation process, has high acetylene / ethylene separation selectivity, and is particularly suitable for deeply removing trace acetylene impurities in ethylene raw materials in industry.

The invention discloses an ionic liquid composite supported liquid membrane, which comprises a polymer base membrane, an ionic liquid membrane loaded on the polymer base membrane, and an active polyamide protective layer coated on the ionic liquid membrane. The invention also discloses a preparation method of the ionic liquid composite supported liquid membrane, which comprises the following steps: (1) dissolving a polyamine monomer in a water / ionic liquid cosolvent to obtain a water-phase solution; dissolving a multi-acyl chloride monomer in an organic solvent to obtain an organic phase solution; (2) loading the aqueous phase solution into a polymer basement membrane through vacuum filtration; and (3) coating the polymer base membrane with the organic phase solution, and carrying out interfacial polymerization reaction on the polyamine monomer in the water phase solution and the polyacyl chloride monomer in the organic phase solution to form an active polyamide protective layer. The invention also provides application of the ionic liquid composite supported liquid membrane in gas separation. The ionic liquid composite supported liquid membrane disclosed by the invention has relatively high gas permeability and breakdown pressure.

The present invention provides a preparation of an imidazole-derived column [5] aromatic chiral filler and its use in the separation of chiral aromatic and chiral aliphatic enantiomers. The present invention uses brominated column [5] aromatics bonded with aminopropyl porous silicon and further halogenated with chiral imidazole derivatives (S-histidinol, S-1-(5-phenyl-1H-imidazole-2-yl)ethylamine) to simply prepare a chiral imidazole-derived column [5] aromatic chiral filler, and can achieve high selectivity separation of chiral aromatic and chiral aliphatic enantiomers in normal phase and reverse phase modes, and obtain good temperature responsiveness and repeatability results. It is a new type of chiral filler with development potential.