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A.what on earth affects the crystal structure of the products was to be figoured out through these surveys : when the impurities were formed and how they could be eliminated. what we already knew was that an unavoidable impurity was formed in the process of chlorination and could be removed by rectification. B.during the establishment of new workshop , it , rectification of chlorides other than recrystalization , has been considered. C.post treatment of waste water that contains too many salts to make it not easy to deal with was designed to be three-effect distillation this time. D.as for solvent , some consideration and improvments had been carried out , however , without ideal effect . For example , 1,2-dichloroethane was used as solvent only to find out more impurities , which may due to the good dissolution of catalysts . ´óÖ·ÒëÁËÏ£¬¿´¿´ÔõÑù¡£ |
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