Chemical properties and preparation methods of pseudo boehmite

The typical structure of pseudo boehmite is an extremely thin folded layer, which is an alumina hydrate with a special spatial network structure. It has high specific surface area, large pore volume, and other physical properties, as well as chemical properties such as gelation thixotropy under acidic conditions. The characteristics of pseudo boehmite make it widely used in many industries, as a catalyst, carrier, and binder in the petroleum industry; Used as a carrier coating for automotive exhaust treatment catalysts in the automotive industry; Used as an additive for flame retardant materials in the field of fire protection; Used as an ink absorbing coating in high-end inkjet printing paper in the papermaking industry; Used as a gas purification adsorbent, a defluorination agent for drinking water, and a color and odor suppressant for industrial wastewater in the environmental protection industry; Used as a coating additive in the construction industry; Reinforcing agents in ceramic composite materials.

There are many preparation methods for pseudo boehmite, which can be divided into three methods based on the source of raw materials and product properties: rapid dehydration of boehmite, neutralization of aluminum salts, alcohol aluminum method, alkali method, nitric acid method, etc. The preparation process includes processes such as gelation, aging, washing, drying, and molding. Due to the fine particle size of pseudo boehmite, attention should be paid to mastering the precipitation, washing, and drying processes. Foreign countries usually use the alcohol aluminum method to produce pseudo boehmite, resulting in high quality and purity products, but production costs, energy consumption, and sales prices are also relatively high. The methods used in China are mostly neutralization methods such as acid or alkali methods, but production costs, product quality, and environmental issues limit the improvement of the process. At present, using carbonation method to produce pseudo boehmite is a low-cost process route, but the single-phase pseudo boehmite prepared by this method has harsh conditions, low strength of sodium aluminate solution, low gel concentration, difficult molding, and poor quality. Therefore, the development and implementation of controllable performance, low energy consumption, green environmental protection, and recyclable new preparation technologies and processes have become key issues for the sustainable development of pseudo boehmite.

The above is the relevant content about pseudo boehmite compiled by Yangzhou Zhongtianli, a manufacturer of pseudo boehmite, hoping to provide some help to everyone. If you would like to learn more about the preparation of boehmite, please feel free to contact us.