How to select the valve of glass reaction kettle? Pay attention to the scientific nature of materials

[technical article of chinapharma.com] in 2016, China's pharmaceutical industry policies came out frequently, which made the pharmaceutical industry enter the fast lane of development According to the data, in 2016, biopharmaceuticals accounted for a high proportion of investment in the pharmaceutical industry Due to the development of biotechnology, the maturity of antibody coupling technology, and the development of cro company, the R & D cycle of biopharmaceuticals was greatly shortened, and biopharmaceuticals developed rapidly This will bring new business opportunities to biopharmaceutical related equipment, and glass reactor, as one of the important biopharmaceutical equipment, will also usher in new development space At the same time, when purchasing glass reaction kettle, how to select the valve of glass reaction kettle has also won the attention of more buyers (how to select the valve of glass reaction kettle? Attention should be paid to the scientificalness of materials) glass reactor is mainly used in the experiments and production of chemistry, fine chemicals, new materials synthesis of biopharmaceutical, etc The product can be used as a system device with circulating water vacuum pump, low temperature coolant circulating pump and circulating oil bath pot, or used in pilot production It is understood that most of the solutions in the operation of various inorganic chemical enterprises are multi-component mixed solutions, which are particularly corrosive, leading to corrosion has become one of the thorny problems of glass reactor equipment Light damages the equipment, heavy causes accidents and even disasters According to statistics, about 60% of the damage of glass reactor equipment is caused by corrosion Therefore, when selecting valves, we should first pay attention to the scientific selection of materials So, how to choose the valve of glass reaction kettle according to the characteristics of corrosive medium? The author understands that in the actual selection process, due to the lack of relevant knowledge and the lack of concept of corrosive medium, many people choose the valve of glass reaction kettle, resulting in continuous safety problems during the use process Therefore, it is very important to choose the right valve It is understood that Gongyi Yuxiang Instrument Co., Ltd is a production-oriented enterprise specializing in the research, development and manufacturing of biochemical equipment, modern pharmaceutical equipment, scientific and educational equipment It not only has advanced development ability for glass reaction kettle, but also has rich experience in valve selection for glass reaction kettle In this regard, the relevant technical personnel of Yuxiang instrument made a detailed introduction The main contents are as follows: 1 Sulfuric acid: as one of the strong corrosive media, sulfuric acid is an important industrial raw material with a wide range of uses Sulfuric acid of different concentration and temperature has great difference in corrosion of materials For concentrated sulfuric acid with concentration above 80% and temperature less than 80 ℃, carbon steel and cast iron have better corrosion resistance, but it is not suitable for sulfuric acid with high speed flow, and it is not suitable for pump valve materials; ordinary stainless steel such as 304 (0Cr18Ni9) and 316 (0Cr18Ni12Mo2Ti) has limited use for sulfuric acid medium Therefore, the pump valve for conveying sulfuric acid is usually made of high silicon cast iron (difficult to cast and process) and high alloy stainless steel (alloy 20) Fluoroplastics have better sulfuric acid resistance It is a more economical choice to use fluorine lined valves 2 Acetic acid: it is one of the substances with strong corrosiveness in organic acid Ordinary steel will be severely corroded in acetic acid of all concentrations and temperatures Stainless steel is an excellent acetic acid resistant material 316 stainless steel with molybdenum can also be used for high temperature and dilute acetic acid steam For high temperature and high concentration acetic acid or containing other corrosive media, high alloy stainless steel valve or fluoroplastic valve can be selected 3 Hydrochloric acid: most of the metal materials are not resistant to hydrochloric acid corrosion (including various stainless steel materials), and the molybdenum containing high silicon iron can only be used for hydrochloric acid below 50 ℃ and 30% In contrast to metal materials, most non-metallic materials have good corrosion resistance to hydrochloric acid, so rubber lined valves and plastic valves (such as polypropylene, fluoroplastics, etc.) are good choices for conveying hydrochloric acid 4 Nitric acid: most of the general metals are destroyed by rapid corrosion in nitric acid Stainless steel is a widely used nitric acid resistant material, which has good corrosion resistance to all concentrations of nitric acid at room temperature It is worth mentioning that the corrosion resistance of molybdenum containing stainless steel (such as 316, 316L) to nitric acid is not only not better than that of ordinary stainless steel (such as 304, 321), sometimes even worse For high temperature nitric acid, titanium and titanium alloy are usually used The technicians of Yuxiang instrument remind that due to the different media in the glass reaction kettle, the purchasers should be more careful when selecting valves to avoid the risks caused by economic losses and equipment errors Conclusion: the selection of valves for glass reaction kettle is very important The correct selection of valves for corrosive medium can ensure the normal service life of the equipment and reduce safety accidents and economic losses At the same time, in the context of biomedical equipment ushering in development opportunities, manufacturers should eliminate the phenomenon of "product homogeneity", improve innovation ability, and develop products suitable for market demand Yuxiang instrument's glass reaction kettle has absorbed the advantages of similar products both at home and abroad At the same time, it is bold and innovative It is not only convenient to use (one person can operate, clean and disassemble), but also novel and practical in structure, beautiful and generous in appearance It is a domestic glass reaction kettle equipment and an ideal equipment for modern chemistry, fine chemicals, biopharmaceuticals, new material synthesis and other experiments and production.