Nanjing University of Technology

Nanjing Tech University

Nanjing Jiusi High-Tech Co., Ltd.

Nanping Xu

Weihong Xing

Zhaoxiang Zhong

Feng Zhang

Yong Wang

Wanqin Jin

Chun Zhang

Xuehong Gu

Rizhi Chen

Yiqun Fan

Zhenzhou Shi

Feng Han

Yuanyuan Chen

Zhilong Xu

Honglin Mao

Hongnian Shang

Wang Wei

Gongping Liu

Weixing Li

Yu Liu

The Invention relates to a method for preparing a multichannel hollow fiber membrane. According to a certain ratio, ceramic powder, a macromolecular polymer, an organic solvent, and a dispersant are mixed evenly to prepare a membrane casting solution; and after bubble removing processing is performed on the membrane casting solution, a membrane green body is formed with the cooperation of a multichannel hollow fiber die and phase inversion. After the membrane green body is roasted at a high temperature, a multichannel ceramic hollow fiber membrane is formed. The multichannel ceramic hollow fiber membrane has an asymmetric structure and a skeleton structure in an inner cavity and can meet the strength and flux requirements of a ceramic hollow fiber membrane.

Method for preparing multichannel ceramic hollow fiber membrane

The present invention relates to a method for preparing nanoporous polysulfone-based polymers, including: a copolymer of a polysulfone polymer and a polar polymer is immersed into a compound swelling agent, and maintained for at least 1 minute above room temperature; the compound swelling agent is a 'solvent pair' composed of the mixture of solvent A and solvent B; the solvent A has high affinity with the polysulfone polymer; and the solvent B has high affinity with the polar polymer; the treated copolymer is taken out from the compound swelling agent and then dried to remove the solvent to obtain the nanoporous polysulfone-based polymers.

Method for preparing nanoporous polysulfone-based polymers

The present invention relaters to a method for continuously preparing a nano zinc oxide with a membrane reactor. A zinc salt solution and a precipitator solution required for the preparation of a zinc oxide are respectively used as dispersion phases, and under the action of a certain pressure, the two reaction solutions respectively penetrate through a membrane tube at a certain rate and disperse quickly under the action of a shear force and react, producing a precursor precipitate. A precursor suspension penetrates through the membrane tube continuously and circularly after being pressurized by a pump, and at the same time, deionized water as a washing fluid is added to a suspension storage tank, wherein impurity ions penetrate through membrane pores and are discharged along with the liquid medium; after the concentration of the impurity ions meets requirements, the concentrated solution is discharged continuously and then spray-dried to obtain a basic zinc carbonate precursor powder. The basic zinc carbonate powder is calcined under certain conditions to obtain the nanostructured zinc oxide powder. The continuous preparation and washing of a powder can be achieved by coupling a membrane washing technique with a membrane dispersion technique. The procedure is simple, the structure of zinc oxide is easy to control and the yield is high.

Method for continuously preparing nano zinc oxide with membrane reactor

A preparation method of a SiC porous ceramic material and porous ceramic material manufactured by using the method, comprising: mixing a SiC aggregate, a sintering aid (zirconium oxide), a pore-forming agent (activated carbon) and a polymer binder with a reinforcing agent (SiC whiskers) according to a certain proportion, and obtaining a porous ceramic material via forming, drying and high-temperature sintering. The porous ceramic material has a high strength, a high porosity, a good thermal shock resistance and a low sintering temperature, and can server as a filter material of high-temperature flue gas and a carrier material in vehicle exhaust purification.

Preparation method of SiC porous ceramic material and porous ceramic material manufactured by using same

The invention relates to a solvent-free green ammoximation process based on membrane distribution with a procedure as: adding TS-1 catalyst and ketone into a reactor in advance; setting the stirring speed and reaction temperature; after reaching the set temperature, adding a certain amount of ammonia and hydrogen peroxide into a reaction solution, wherein the hydrogen peroxide is fed in a way of using membrane as a distributor, the ammonia is fed in a continuous or semi-continuous manner; oxime is produced upon the reaction. The advantages of the invention include the mild reaction conditions, high reacting efficiency, simple operation and environmentally-friendly process. And there is no need to add any solvent during the reaction process. During the ammoximation reaction, both the conversion rate of the ketone and the selectivity of the oxime can be over 98.0%.

Solvent-free green ammoximation process based on film distribution

A method for preparing organic-inorganic composite materials is provided. It is a dispersion method that the inorganic phase is introduced into the polymer matrix uniformly. The core-shell structure, in which the inorganic materials are core and the organic materials are shell, is formed by first wrapping the inorganic materials with the organic materials in the same reactor. Therefore, the match between the polarity of inorganic phase and the polarity of polymer phase is increased.

Method for preparing organic-inorganic composite materials

Provided is a cleaning process of producing lactic acid. Firstly saccharification liquid is prepared through saccharated materials, then fermented with nutritive materials and lactic acid bacteria, and liquid alkali is used to adjust the pH. The fermentation broth is filtrated with porous membrane, and the lactic acid bacteria in the interception liquid are then reintroduced into the porous membrane for recycling. The permeate from porous membrane is subjected to nanofiltration to be decolored and purified. The concentrated solution from nanofiltration and the cleaning liquid from fermentation tank and its affiliated equipment are filtrated and sterilized by using ceramic membrane, and then are reintroduced into the fermentation unit for recycling. The permeate from nanofiltration is then subjected to bipolar electrodialysis system to prepare lactic acid, and the liquid alkali produced at the same time is reintroduced into the fermentation tank for recycling. The lactic acid is finally concentrated by using vacuum distillation. The process recycles the bacteria in the liquid alkali and matured fermentation broth, and is characterized by low material consumption and emission, low pollution, reduced cost and cleanness and environmentally protection of the whole production process.

Cleaning process of producing lactic acid

Dry dust removal method in organic chlorosilane production is provided, in which the detailed steps are as follows: delivering high-temperature flue gas (a) from fluidized bed reactor (I) into inorganic film cross-flow filter (E) to remove dust for the first time; delivering the concentrated dust gas (c) trapped by inorganic film cross-flow filter (II) into bag filter (III) to remove dust for the second time; returning the gas mixture (f) of passing through bag filter (EI) to the air intake of inorganic film cross-flow filter (II); condensing the residual clean gas (b) from the osmotic side of inorganic film in condenser (A), and then rectifying in rectifying column (B) to separate the products of chloromethane (g) and methyl chlorosilane (h) to obtain the product of methyl chlorosilane (h); returning chloromethane to fluidized bed reactor to take part in reaction; retreating the dust (e) trapped by inorganic film cross-flow filter and bag filter, and then returning it to fluidized bed reactor (I) to take part in reaction.

Growing community of inventors

Nanjing, China

Nanping Xu