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Initial temperature has little effect on total yield, but high temperatures will extend the initial reaction time, the use of room temperature reaction is good. 3.2 The effect of exhaust gas treatment up to trace chlorine and hydrogen chloride absorption tower effective to prevent and reduce environmental pollution. 3.3 The choice of solvent than the solvent than in the 15:1 experiment, the chlorination reaction tube, 15 * still clogging chlorine affect the operation; solvent ratio can be increased to 16: l or more, until no chlorine pipe clogging up. 3.4 The selection of the side chain chlorination of light intensity light intensity on the side chain chlorination rate have a greater impact, light enhancement can speed up the reaction rate, shorten the reaction time, the light conditions are more appropriate o-xylene: illumination of a 1ml: 0 .8 W. 3.5 Process Parameters (see table) Schedule 4 Conclusion of process parameters to determine the device made with ordinary glass, and equipment corrosion and solvent resistant, easy to observe and control the production, use of glass material for the production (eg, borosilicate glass) provided. l973, 6.2 Chinese enterprises Daquan pesticide Writing Group. Chinese pesticide companies Daquan, first edition. Beijing: Chemical Industry Press, 1996.3AZerb. 1 <l1inZ1964 (1): 95 (Russ). 4Cl01634204.5 Ningbo Chemical Industry Research Institute. 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