Study On Cooling Crystalization Process Of Antioxidant 1010

As one kind of high molecular weight suffocate hydroxybenzene antioxidant, antioxidant 1010 is widely used in plastic, rubber, synthetic fiber, elastomer, petroleum products and fodder fields. Up to now, the domestic antioxidant 1010 is not as good as those overseas products in granularity, stack-density and crystal form. Therefore, a systematic academic and laboratorial research on the crystallization processes was done in detail. The crystal appearance has been observed with the help of scanning electron microscope. The DSC instrument was used to measure the melting point, melting enthalpy and half-peak width of antioxidant 1010. The crystal form was determined by X-ray Diffraction. With single crystal data of patents, crystal habit of antioxidant 1010 was forecasted in Cerius2 software by BFDH model and AE model. In using of DSC, the effect of solvent and cooling speed on crystal form has been discussed. The static method was used to measure the solubility of antioxidant 1010 at different solvent ratios. The laser method was used to measure the inducement period and metastable zone of antioxidant 1010 at ethanol-isopropanol-water. With the data of inducement period, solid-liquid phase interface tension has been calculated. Effect of cooling speed, stirring speed, seeds on metastable zone has been reviewed. With the help of DSC instrument, melting point and decomposing heat have been measured. The stack-density has been determined with simple instrument. All these works will provide base data and academic foundation to crystallization processes optimization and industrial magnification. The cooling crystallization kinetics was measured by batch dynamic methods. The kinetic data were treated with a discretized population balance model. A size-independent growth and size-independent agglomeration kinetic model was established. The growth equations, agglomeration equation and nucleation equation of antioxidant 1010 have been deduced. Aiming at half-peak width less than 5 degree centigrade and a uniform granularity distribution of antioxidant 1010 produces, the effect of seeds putted or not, temperature of seeds inputted, quantity of seeds inputted, seeds granularity, cooling speed, stirring speed, washing up, solvent, drying, crystallization time on products performance have been reviewed experimentally. In using of these reviewing data, the experiential optimum crystallization conditions have been determined ultimately. There aren't any similar literatures to above study results have been reported up to date.