Preparation of Hydrotalcite by Precipitation-crystallization Process and the Adsorption Kinetics of Resin on the Hydrotalcite

The hydrotalcite was synthesised by precipitation-crystallization process,the process of precipitation and crystallization was monitored on situ by using focused beam reflectance measurement(FBRM).The high-resolution transmission electron microscope(HRTEM) was used to characterize the micromorphology of the samples,and the adsorption mechanism of resin on hydrotalcite was suggested according to adsorption kinetics models,aiming to provide the scientific basis for developing the novel pitch control agent.The results showed that secondary nucleation is the main process of crystallization,and 6 h aging time could obtain hydrotalcite with a high degree of crystallinity.The prepared hydrotalcite had well-defined thin platelet morphology.After calcinations the platelet structure of the hydrotalcite disappeared,which was confirmed by high-resolution transmission electron microscopy.The process of resin adsorbed on calcined hydrotalcite was mainly chemical adsorption,and the adsorption kinetics accorded with the pseudo second order kinetic equation.