2results about How to "Control aperture" patented technology

This invention provides a composite nanofiltration membrane, its preparation method, and its application, belonging to the field of pollutant removal technology. The invention first coats the surface of a macroporous base membrane with a high molecular weight polyelectrolyte system to cover the macropores, then fills the micropores of the base membrane with a low molecular weight polyelectrolyte. This improves the retention rate of micropollutants in the layer-by-layer self-assembled membrane, reducing pore size while maintaining high permeability. This invention prepares a multilayer composite nanofiltration membrane by coating polyelectrolyte systems of different molecular weights onto a high-porosity base membrane and repeating the coating process. The prepared composite nanofiltration membrane achieves a removal rate of over 90% for micropollutants with a molecular weight of around 200 Da, with a maximum removal rate of 99.8%.

This invention belongs to the field of catalyst technology, specifically relating to a special catalyst for hydrogenation of waste plastic pyrolysis oil and its preparation method. The preparation method includes the following steps: (1) preparing mixed solutions of aluminum salt / polyethylene glycol and ammonium salt / triethanolamine respectively, and then preparing an alumina support by co-precipitation and calcination; (2) preparing a mixed solution containing phosphorus and nickel, impregnating the alumina support, and obtaining a phosphorus-nickel catalyst after drying and calcination; (3) preparing a mixed solution containing molybdenum and nickel, impregnating the phosphorus-nickel catalyst, and obtaining a special catalyst for hydrogenation of waste plastic pyrolysis oil after drying and calcination. This invention uses polyethylene glycol and triethanolamine as mixed template agents to prepare an alumina support through co-precipitation and calcination; and uses nickel source, phosphorus source and molybdenum source to impregnate the alumina support stepwise to prepare a special catalyst for hydrogenation of waste plastic pyrolysis oil. The preparation process is simple, the cost is low, and the application prospects are broad.