Professor qinmenghua is mainly engaged in the research of Secondary Fiber Pulping Chemistry and technology, pulping and papermaking biotechnology, extract chemistry and resin barrier control. He has published more than 160 academic papers, of which more than 50 were included by SCI, EI and ISTP. The theory of double-layer structure of resin particles in slurry water system is proposed for the first time in the world. Proposed and improved the theory and technology of bio limited degradation and modification of plant fibers, applied for 9 national invention patents, and published an academic monograph. It has undertaken and presided over 24 national, provincial and enterprise commissioned scientific research projects, such as the National Natural Science Foundation and international cooperation projects. It has successively won one third prize for theoretical achievements of the National Education Commission, one third prize for scientific and technological progress of the Ministry of education, two second prizes for scientific and technological progress of Shandong Province, two third prizes for scientific and technological progress of Shandong Provincial Department of education, and one first prize for scientific and technological progress of Jinan City. He has been invited to visit Finland, France, Sweden, Denmark, the Netherlands, Germany and other countries for extensive academic exchanges and cooperation.

Interview: qinmenghua, winner of the 2011 National Science and Technology Progress Award and vice president of Shandong Institute of light industry

The pulp and paper industry with plant fiber as raw material is an important basic raw material industry of China's national economy, and also a key industry of energy conservation, emission reduction and pollution control. After more than ten years of research, the team led by Professor qinmenghua of Shandong Institute of light industry, in conjunction with Huatai Group Co., Ltd. and China pulp and paper research institute, has made breakthroughs and innovations in key technologies such as reducing energy consumption in beating and refining, cleaner production of waste paper and improving the quality of pulp by means of modern biotechnology, and has solved the key scientific and technological problem of selective degradation of biological enzymes in the pulp and paper industry. It has obtained a number of original theoretical achievements, created a key technology system of papermaking fiber enzymatic hydrolysis with China's independent intellectual property rights, and has successively obtained 8 national invention patents. On February 14th, 2012, at the national science and Technology Awards Conference held in the Great Hall of the people in Beijing, Professor qinmenghua received the second prize of the national science and technology progress award, which was also the only award-winning project in the paper industry in that year.

Talking about the course: Research for more than ten years and initial test of ox knife

In 1996, qinmenghua started his research on biotechnology while studying for a doctorate at South China University of technology. At that time, the main research project was to use lipase to degrade resins. After his doctoral degree in 1998, qinmenghua taught at Shandong Institute of light industry and continued his post doctoral research at the State Key Laboratory of microbial technology of Shandong University to further study the enzymatic deinking technology of cellulase.

In the autumn of 1999, qinmenghua and researchers from the State Key Laboratory of microbial technology of Shandong University started the first industrial production application in Zhucheng paper mill, Shandong Province. Firstly, cellulase preparation suitable for waste newsprint deinking was prepared by solid fermentation technology. After more than a month of industrial production test, qualified newsprint was produced by Enzymatic Deinking Technology on the waste newsprint deinking production line of the enterprise. Compared with chemical method, the whiteness and dust degree of newsprint have been greatly improved.

The first production application inspired the enthusiasm and confidence of Professor Qin and his team. After returning to school, they did a lot of research and selected several enzyme preparations from Novozymes from a large number of enzyme preparations to conduct industrial production tests on a larger scale office waste paper deinking production line (editor's note: the 100 ton / day deinked pulp production line supporting the original white paperboard of Sun Paper). "This time, we encountered a real problem. The good scheme obtained in the laboratory was applied to production, but the results were quite different. In half a month, we adjusted and tried five different enzyme preparations before and after, and finally achieved ideal results and stable operation. The whiteness and dust index of deinked pulp were better than those of traditional chemical deinking, and the production cost was significantly reduced.

On Achievements: strive to catch up with the international advanced level

Since the 1980s, foreign researchers have started the research of biotechnology in the paper industry. Professor qinmenghua has always followed the forefront of international research. After more than ten years of research, he has finally obtained a number of original theoretical achievements and created a key technology system of papermaking fiber enzymatic hydrolysis with China's independent intellectual property rights.

The main contents of the project include: (1) the enzymatic beating mechanism of chemical pulp by cellulase is proposed, and an enzymatic beating technology that can selectively degrade is developed, that is, while significantly reducing energy consumption, improving the strength of pulp; (2) The route of fiber selective enzymatic hydrolysis under deinking conditions was revealed, and efficient neutral deinking agent was synthesized. An office waste paper enzymatic deinking technology and waste newsprint neutral deinking technology were developed, which greatly reduced the pollution load of deinking wastewater; (3) The theory of laccase mediator deinking of waste newsprint was put forward, and the synergistic effect of laccase and cellulase in the deinking process was found. A selective degradation technology of laccase mediator and laccase cellulase deinking of waste newsprint was invented, which further improved the quality of deinked pulp; (4) The double-layer structure model of resin in pulp water system was constructed, and a biological treatment technology that can effectively reduce the demand for anionic impurities and cation charge and resin deposition was developed, which optimized the wet end chemical system of papermaking; (5) The mechanism of modification of mechanical pulp and chemical pulp fibers by cellulase and laccase was clarified. The mechanism of selective biodegradation of fiber raw materials by cellulase, laccase and microorganism before pulping was clarified. A selective degradation technology of fiber raw materials before pulping to reduce pulping energy consumption and a biological treatment technology to improve pulp strength performance were developed.

After the technology is applied to production, the beating energy consumption of softwood pulp can be reduced by 10% - 30%, broadleaf pulp energy consumption can be reduced by 35% - 45%, straw pulp energy consumption can be reduced by 40% - 55%, and the pulp strength can be improved to varying degrees; The energy consumption of pulping in the enzymatic deinking process of waste paper was reduced by 25%, and the brightness and strength of pulp were further improved; Pectinase treatment can reduce the cation charge requirement of anionic impurities in pulp water system by 30% - 60%, reduce the amount of resin deposition by 10% - 55%, and increase the retention rate by 10% - 80%; Using cellulase, laccase or bacteria to treat plant fiber raw materials can save 30% - 40% of refining energy consumption, and greatly improve the strength and whiteness of subsequent pulp; After enzymatic modification, the breaking length of mechanical pulp increased by 8% - 58%, and the wet strength of kraft pulp increased by 100%. The above performance indicators have reached the international advanced level.

On paper industry: Green needs Biotechnology

During the 12th Five Year Plan period, both environmental protection planning and the paper industry planning have made clear requirements for reducing pollution. How to continue to develop the paper industry when environmental capacity allows has become a problem that every paper industry worker needs to consider.

Talking about the future development direction of green paper industry, Professor Qin affirmed it and put forward his own point of view in combination with his own research results: "green paper industry should ensure that all additives from the source to the finished product, including the middle, should be green and degradable. Now the country has paid attention to the control of paper pollutants, but the control of additives used in the pulp and paper process has not been paid attention to, nor have binding regulations. Although the amount of these chemicals is small, some chemicals are difficult to degrade, so these chemicals will pollute the natural environment."

"The green paper industry needs biotechnology!" Professor qinmenghua said, "biotechnology is a kind of green technology. Compared with the traditional process, the application prospect of biotechnology is very bright. There is a large application space in enzymatic pulping, enzymatic deinking, resin biological control, enzymatic modification of fiber and biological bleaching. Biotechnology will play a greater role in energy conservation, emission reduction and sustainable development of the paper industry."

On Innovation: to serve enterprises, we need to pay attention to theoretical research

Since 2009, projects in the paper industry have won the second prize of the national science and Technology Progress Award for three consecutive years, reflecting the considerable progress in scientific and technological innovation in the paper industry. Professor Qin believes that in the past decade, China's scientific research in the field of papermaking has made rapid progress, and the level is relatively high, and the research in some aspects has been at the international leading level.

Professor Qin said, "nowadays, application research is increasingly inseparable from basic exploration. The days when general process research can serve enterprises have passed, and we should start from the source, start with theoretical research, and endure the loneliness and failure of basic research. only when basic research is clear, can the level of Applied Research be improved, and can we truly obtain our original technology. Therefore, as a scientific and technological worker, we should walk on two legs. We should not only base ourselves on the actual production, aim at the actual problems existing in industrial production, and find the course problems from the actual situation, but also start from theoretical research, and truly clarify the causes of the problems, so as to find out the ideas to solve the problems and put forward practical and advanced technologies."