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A Study on the Cooling Crystallization Process of Acephate

Author: WangLingTao
Tutor: YinQiuXiang
School: Tianjin University
Course: Chemical Engineering
Keywords: Acephate Crystallization thermodynamics Crystallization kinetics Cooling and crystallization Crystal habit Polymorphs
CLC: TQ453.2
Type: Master's thesis
Year: 2007
Downloads: 159
Quote: 4
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Abstract


Acephate is an important organophosphate insecticides , it has high efficiency, low toxicity and residue characteristics , and therefore is the ideal substitute of methamidophos , and has broad application prospects . Product purity and crystalline closing low domestic the acephate production process there conducted a systematic study of acephate cooling crystallization process . By laser dynamic measurement of the solubility of acephate in dichloromethane, ethyl acetate , acetone and isopropanol , using Apelblat model experimental data on the solubility associated fit better ; measured using the laser method, the acetyl metastable zone of methamidophos in dichloromethane , and investigated the influence of temperature and cooling rate on the metastable zone width ; measured acephate nucleation induction period in dichloromethane solution , and thus calculate the surface tension of the acephate the solid-liquid . The intermittent dynamic Determination acephate in dichloromethane cooling crystallization kinetics data Moments transformation method and size - independent growth model kinetic data processing , regression of the growth rate and the nucleation rate dynamics equation. At the same time , the analysis of the impact of various operating conditions on the nucleation rate and growth rate of over- saturation , the suspension density , stirring rate . The acephate cooling and crystallization process technology optimized crystallization thermodynamics and kinetics studies based on . The problems of domestic manufacturers in acephate crystallization process , the effects of various operating parameters ( initial concentration , the final temperature , cooling rate , stirring rate , seed dosing ) for the purity and yield of acephate and product particle size distribution , developed a cooling crystallization process and to determine the optimal experience process operating parameters . Meanwhile, the four solvents methylene chloride , ethyl acetate , acetone and isopropanol acephate crystal habit and crystal .

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CLC: > Industrial Technology > Chemical Industry > Pesticide Industry > Pesticides > Organic pesticides
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