Background

With the rapid development of industry, the demand for organic solvents in the domestic and international markets is growing day by day. Most organic solvents and water are easy to form azeotropes or near boiling substances. Conventional separation technology is used for dehydration, which has the disadvantages of high energy consumption and complex process flow. Molecular sieve membrane separation dehydration technology has the advantages of small equipment occupation, simple operation, low energy consumption, pollution-free, etc. It has broad application prospects in solvent dehydration applications in energy, petrochemical, biological medicine, pesticide and many other industries. At present, NaA molecular sieve membrane products mainly adopt tubular structure, with relatively low flux and packing density, high equipment investment and restrictions of molecular sieve membrane sealing structure, which restrict the application of this technology in the production process of bulk chemicals such as bioethanol.

R&D leader

Gu Xuehong：He is a professor and doctoral supervisor of Nanjing University of Technology. He is currently the dean of the School of Chemical Engineering of Nanjing University of Technology. In 1997, he graduated from the School of Chemical Engineering of Nanjing University of Chemical Technology with a bachelor's degree. In June 2002, he obtained a doctor's degree in engineering from Nanjing University of Technology. From April 2003 to January 2007, he was engaged in post doctoral research in the School of Mining Technology of New Mexico and the University of Cincinnati. In February 2007, he returned to China to teach, mainly focusing on energy and environmental needs, to carry out research on the preparation and application of molecular sieve membranes, And focus on the basic research and industrial application development of pervaporation molecular sieve membrane dehydration.

Progressiveness of Technology

Molecular sieve membrane dehydration technology has the advantages of low separation energy consumption, no pollutant emission, and small equipment space. The high-performance hollow fiber molecular sieve membrane of the project product is an energy saving and environmental protection technology independently developed. With ceramic sealing technology, the solvent resistance and pressure resistance have been significantly improved. The product performance has reached the international advanced level, and its energy is more than 4 times the flux of conventional tubular NaA molecular sieve membrane.

Economic and social benefits

During the development and industrialization of the project, successively signed technology development contracts with Sinopec and COFCO, especially with Guangxi COFCO Biomass Energy Co., Ltd. to apply hollow fiber molecular sieve membrane dehydration technology to the production of fuel ethanol, realizing the first application of this technology in the production of major chemicals. At present, it has cooperated with Shenhua Group and COFCO Group to further apply this technology to the field of bioethanol. It is expected to form a demonstration project with a treatment scale of 3-5 million tons in the next three years, and the total annual treatment of solvent will reach 100000 tons. At the same time, this technology can also be transferred to the derivative company Jiutian Hi Tech by means of technology transfer, supporting the company to become bigger and stronger.

Background

Water treatment membrane is a new green water treatment technology in the 21st century. It has the advantages of high efficiency, no secondary pollution, and moderate operating conditions. It is increasingly favored in wastewater treatment, seawater desalination, reclaimed water reuse, and tap water purification. Among them, hollow fiber PVDF ultrafiltration membrane material has excellent performance and has been widely used in pretreatment and advanced treatment processes of industrial wastewater, municipal sewage, drinking water, seawater desalination, etc. The PVDF ultrafiltration membrane market in China is growing at an annual rate of more than 30%. The main manufacturers are Bishuan, Jinmo Technology, Beijing Sanuo, Hainan Lisheng, Zhaojin Membrane Sky, etc. The market scale of membrane water treatment has exceeded 10 billion yuan, of which domestic membrane products account for half of the domestic market.

R&D leader

Wang Chaohui：Professor of Nanjing University of Technology, master's supervisor, Jiangsu Province Distinguished Professor, Jiangsu Province "Innovation and Entrepreneurship Talent", "Nine Thought Scholars", Jiangsu Province May Day Labor Medal, "Nanjing May Day Innovation Expert", "Nanjing Technical Expert" and other award winners, participated in 973, 863, national support plan, national key research and development plan and other projects.

Progressiveness of Technology

The project has creatively developed the VNIPS ultrafiltration membrane production process to achieve the goal of accurately regulating the pore diameter of PVDF ultrafiltration membrane separation layer. The mass produced PVDF ultrafiltration membrane has a high opening rate in the cortex, small and uniform pore diameter, and the most probable pore diameter ratio has increased from about 50% of the conventional to nearly 90%. When the average pore diameter is about 25nm, the maximum pore size does not exceed 40nm, while the maximum pore size of the same type of membrane in the conventional market is often greater than 100nm. The application of water treatment engineering shows excellent anti pollution ability. Secondly, the flexible drawing process is integrated into the spinning process, and the tensile strength of the hollow fiber membrane is up to 5 MPa, while the tensile strength of the products produced by the conventional hollow fiber spinning process is generally lower than 3.0 MPa. The flexible stretching process not only significantly improves the overall strength of the film, but also maintains the good flexibility of PVDF film, without affecting the narrow pore size distribution of VNIPS film. Through the optimization of membrane filament filling mode, aeration mode and concentrated water collection mode in the module, further improve the anti pollution ability of the module and the flux recovery rate after cleaning. Therefore, compared with similar products, it has obvious advantages in anti pollution performance. After long-term comparison with the best ultrafiltration membrane of similar products in the world under the same working condition, there is no obvious difference in comprehensive performance, and it has advantages in specific fields such as papermaking wastewater treatment.

Economic and social benefits

Since the implementation of the project, it has provided high pollution resistant PVDF hollow fiber ultrafiltration membrane products and technical support services with excellent performance for many enterprises' wastewater treatment projects, with a total membrane area of 280000 square meters. Especially in the aspect of wastewater treatment in the paper industry, the project has developed PVDF special ultrafiltration membrane for the qualified tail water of paper making, It has been successfully applied to the zero wastewater discharge project of the pulp and paper mill invested more than 10 billion yuan by the Japanese Prince Company in Nantong. The wastewater treatment capacity of the project is 40000 tons/day, the salt concentration of the wastewater is high, and the COD reaches more than 150 mg/L. Through the design of the zero discharge process of the membrane pulping and papermaking wastewater, the wastewater will finally be converted into purified water, industrial salt and dry mud, so as to achieve the purpose of resource utilization. As the core element of ultrafiltration system, high pollution resistant PVDF hollow fiber membrane shows high operating flux and low operating pressure. The investment cost and operation cost of this zero discharge project are less than 50% of those of conventional sea discharge projects, and the total amount of COD discharge can be reduced by about 1000 tons, the total amount of wastewater discharge can be reduced by about 13 million tons, and tens of thousands of tons of salt products can be recovered. This technology has been promoted and applied in the wastewater treatment project of Jinhuasheng Paper (17000 tons/day) under APP and the wastewater treatment project of Jiulong Paper (22000 tons/day), the largest recycled paper manufacturer in China. The successful implementation of the project provides an engineering demonstration for the treatment and reuse of papermaking wastewater in China, and will provide strong support for the sustainable development of China's papermaking industry. In addition, the highly anti pollution ultrafiltration membrane produced by the project has also been successfully applied to chemical wastewater treatment (1440 m ³/ d) . Thermal power plant surface water purification (4800 m ³/ d) Coal mine wastewater treatment (6000 m ³/ d) And other projects, giving play to good social and economic benefits.

Background

Compared with traditional reverse osmosis membrane and ultrafiltration membrane, nanofiltration membrane has a more precise pore size range and surface charge, which can realize efficient separation of small molecules such as drugs, dyes, organic salts and inorganic salts, so as to achieve efficient utilization of resources and reduce emissions of three wastes. In recent years, nanofiltration membrane technology has been widely used in the upgrading of drinking water softening and purification processes, and has maintained a stable and reliable treatment effect in long-term operation. The nanofiltration membrane can not only remove the trace chemical substances (such as pesticides, pesticides, etc.) and disinfection by-products (trihalomethanes, haloacetic acids, etc.) remaining in the water, intercept algae, bacteria and pathogenic microorganisms in the water to ensure biological safety, remove harmful multivalent ions such as heavy metals, retain some minerals beneficial to human body in the water, but also ensure the stability of the final water supply under the fluctuation of the water source and acute conditions, Meet the water demand under different water source conditions. The nanofiltration membrane has a high flux under low pressure, and has a high degree of selective separation of monovalent and multivalent ions. The actual energy consumption and cost during operation are lower than those of reverse osmosis membrane. For economically developed areas with complex water source conditions and high water demand, nanofiltration membrane technology may be a more appropriate choice as an advanced treatment process for drinking water.

R&D leader

Sun Shipeng：Professor and doctoral supervisor of Nanjing University of Technology, deputy director of National Special Separation Membrane Engineering Technology Research Center. We focus on the design, preparation and application of organic nanofiltration membrane materials. He was selected into the National Talent Plan (2015), Jiangsu Outstanding Youth Fund (2019), Huo Yingdong Young Teachers Fund (2020), Jiangsu Six Talent Peaks (2016), and International Advanced Materials Association (2021).

Progressiveness of Technology

A novel nanofiltration membrane with a unique four layer structure was constructed by coordinating the structure and properties of the interfacial polymerization selective layer and the base membrane. Different from the traditional 3-layer structure, the nanofiltration membrane developed in this project adds an ultra-thin hydrophilic transition layer between the support layer and the separation layer to improve the anti fouling and anti scaling properties of the nanofiltration membrane during the separation of the two components. The important indexes to evaluate the performance of nanofiltration membrane are water flux and magnesium sulfate retention rate. The performance of self-made membrane breaks the trade off effect between water flux and retention rate of traditional commercial nanofiltration membrane. At the same time, in the experiment of separating sulfate ion and chloride ion with high concentration, the flux of the membrane exceeds that of DL membrane, and the higher the concentration is, the more obvious the advantage is. The separation efficiency of the membrane for the two salts also increases with the increase of the concentration.

Economic and social benefits

This project develops two nanofiltration membrane technologies and products: one is low pressure and high flux nanofiltration membrane for drinking water treatment; Another kind of high pressure and solvent resistant nanofiltration membrane for material separation system under harsh conditions in the industrial field. The project has huge market benefits. According to BCC market analysis data, the global membrane treatment market capacity reached 13 billion US dollars in 2013. Although nanofiltration accounted for less than 2% of the market share, its growth rate was faster, with an annual compound growth rate of 15.6%. By 2019, the market capacity of nanofiltration membrane could reach 445 million US dollars. With the increasing market capacity of nanofiltration every year, the market space and economic benefits of this project will be considerable.

Background

Fermentation industry is one of the important pillar industries in China, but the irrational product structure and environmental pollution seriously restrict the sustainable development of China's fermentation industry. Domestic fermentation enterprises generally adopt the "extensive" production mode dominated by batch fermentation. They cannot track the concentration change of substrate or product in time during the production process. Their understanding of the fermentation process is often in a "black box" state, and the production operation is completely dependent on operating experience. Based on the above status, the Institute has independently developed a nano sensor microchip with independent intellectual property rights and a concentration response fermentation detector to achieve ultra sensitive detection of a variety of fermentation products, substrates and intermediate metabolites.

R&D leader

Jin Wanqin：Professor of Nanjing University of Technology, Executive Deputy Director of the State Key Laboratory of Materials Chemistry Engineering, Chief Scientist of "973", and German "Humboldt" scholar. At present, he is mainly engaged in the research of membrane materials, membrane preparation and membrane reactors, and has successively undertaken more than 10 scientific research projects, including the National "973" Plan, the "863" Plan, the National Natural Science Foundation of China, and the key projects of the Natural Science Foundation of Jiangsu Province.

Progressiveness of Technology

We have developed a nano sensor microchip with independent intellectual property rights and a concentration response fermentation detector to realize ultra sensitive detection of various fermentation products, substrates and intermediate metabolites. Through the unique precision printing technology, the high-performance structured nano sensing crystal is printed into a flexible sensing microchip at one time. It has high biological activity, strong stability, and wide detection range. It can enhance the sensing reaction signal of fermentation components hundreds of times, and convert the concentration signal of fermentation components into electrical signal output instantaneously to ensure the accuracy, speed, and no interference of the detection signal. Based on the sensing characteristics of the chip, the supporting electronic circuit and automatic control system are further developed and integrated into a concentration response fermentation detector. The instrument supports the plug and play mode of the sensor microchip, which can directly detect the viscous and complex fermentation broth, and achieve rapid and accurate detection of glucose, ethanol, fructose, lactic acid, glutamic acid, pyruvic acid and other components in the sample (single detection time<50s, detection error<2%). It has absolute technical advantages in similar products.

Economic and social benefits

At present, the instrument has been used in North China Pharmaceutical Group, and has been praised by users for its advantages of fast detection speed, high sensitivity and being conducive to improving the fermentation conversion rate. The instrument and equipment products not only fill the blank of rapid detection in the fermentation industry, but also further expand the application field of membrane materials. At present, it has reached an agreement with North China Pharmaceutical Group, Shijiazhuang Pharmaceutical Group, Huaiyin Institute of Technology and other enterprises and scientific research institutes, which has attracted the attention of many investment funds.