33results about How to "Improve filtration stability" patented technology

The invention discloses a non-woven fabric surface heavy nitrogen coupling gelatin adsorbing material and a preparation method thereof. The method comprises the following steps of: grafting an unsaturated monomer with carboxy to the surface of a macromolecule non-woven fabric base material by using an ultraviolet induction technique so as to introduce the carboxy; furthermore introducing aromatic amine through catalytic condensation of aroma diamine and carboxy; subsequently, converting the aromatic amine into diazo salt; coupling and immobilizing the gelatin on the surface of the non-woven fabric through diazo coupling reaction; and finally, soaking in hot water and eliminating the uncoupled gelatin so as to prepare the non-woven fabric surface diazo coupling gelatin absorbing material. The absorbing material is good in hydrophilicity, namely, the water absorption rate is greater than 292.3%; the solid load and the absorption rate of the gelatin can be adjusted in a large range, the absorbing material has high absorption capability for tannin; and when the tannin concentration is 200-400mg / L, the balance absorption capacity is within 16.8-53.2mg / g, and the absorption balance can be achieved within 3 hours.

The invention discloses a repeatable water-washable composite air filter material and a preparation method thereof, belonging to the field of industrial textiles. Component polypropylene / polycarbonate mixed masterbatch; Step 2, blow the masterbatch obtained in step 1 into a polypropylene-polycarbonate melt-blown filter material (PPC); Step 3, zinc nitrate hexahydrate, 2- Methylimidazole and anhydrous methanol grow the zeolite imidazolate skeleton on the PPC obtained in step 2 by the in-situ growth method to obtain the polypropylene-polycarbonate / zeolite imidazolate skeleton melt-blown filter material (PPC / ZIF- 8); Step 4, prepare zeolite imidazolate skeleton (ZIF-8) nanocrystal with the mol ratio of 9.08: 72.35: 6292.13 by zinc nitrate hexahydrate, 2-methylimidazole and anhydrous methanol; Step 5, will contain ZIF The polyvinylidene fluoride spinning solution of ‑8 nanocrystals is compounded with the PPC / ZIF‑8 filter material prepared in step 3 to make a composite filter material (PPC / PVDF / ZIF‑8) that can be repeatedly washed with water. The PPC / PVDF / ZIF-8 air filter material prepared by the invention can effectively enhance the filtration efficiency under the premise of high efficiency and low resistance, and PM after encountering water 2.5 The filtration performance is stable.

The invention discloses a monacolin J-producing Aspergillus and its construction method and application. The construction method of a monacolin J-producing Aspergillus disclosed in the invention includes the step of completely blocking the expression of polyketide synthase LovF in the Aspergillus. The invention achieves the accumulation of monacolin J by completely knocking out the lovF gene to block the synthesis of lovastatin, and then using a constitutive promoter to overexpress the transcriptional regulator lovE on this basis, so that the monacolin J of the constructed strain is constructed. The yield of Lin J was further significantly improved, and the fermentation stability of the strain was enhanced. The strain of the present invention can be used to directly ferment and produce monacolin J, thereby simplifying the production process of simvastatin, reducing costs, improving production efficiency and reducing environmental pollution.

The invention provides a preparation method of cornstarch pepper with fermentation stability, which belongs to the field of lactic acid bacteria fermented food processing. The preparation method of the cornstarch pepper comprises: soaking pepper in sodium citrate solution, drying, and pulverizing; preparing corn flour, The rice is matured, the activated monascus is inoculated on the cooked rice, and the monascus is cultivated to prepare the monascus koji, and then the corn flour, fresh chili powder, the monascus koji and lactic acid bacteria seed liquid are anaerobically fermented. Compared with the traditional manual method, the glutaric acid capsicum prepared by the present invention retains the main flavor of traditional glutaric acid, reduces the content of methanol, isobutyric acid, etc., improves the content of flavor substances such as ethyl acetate, ethyl lactate, and total esters, and solves the problem. It solves the problems of difficult quality control, unstable fermentation, and low yield rate in the fermentation process of traditional manual methods. At the same time, it solves the problems of strong seasonality of fresh peppers, difficulty in storage, and restrictions on the annual production of bract sour peppers. It is suitable for industrialized large-scale annual production. Bratty sour pepper is conducive to the national market of this Xiangxi specialty.

The invention discloses a multifunctional filtering bag, which comprises a connecting base, wherein a first filter bag main body is arranged on the top of the connecting base; fixing rods arranged around the first filter bag main body at equal intervals are arranged at the outer side of the first filter bag main body; one end of the fixing rod is fixed with the connecting base; the other end of the fixing rod is fixed with a top cover positioned above the top of the first filter bag main body; a first cage frame is arranged at the inner side of the first filter bag main body; a third filter bag main body and a second filter bag main body are arranged at the inner side of the first cage frame. Through the matched use of the installed structures of the first filter bag main body, the third filter bag main body and the second filter bag main body; the filtering area and the thickness are greatly increased; the filtering quality is further improved; through the installed fixing rods, the connecting base and the top cover, the filtering stability is greatly enhanced; the falling of each component during the filtering can be avoided; the use is flexible.