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电视机外壳热解油中含有的2,4,6-三溴苯酚、1,2,4,5-四溴苯、五溴二苯醚(P5BDE)等会严重影响其质量,为了净化电视机外壳热解油,试验用纯的1,2,4,5-四溴苯作原料,在单金属Pd/C作催化剂,异丙醇作氢源条件下进行催化脱溴研究.同时,研究了反应体系pH值(NaOH加入量)对1,2,4,5-四溴苯脱溴效率的影响,最后探讨了1,2,4,5-四溴苯催化脱溴的反应机理.结果表明,当温度设定为50℃,搅拌速度设定为900r.min-1,反应4h,脱溴效率可达100%;pH值在0～9之间时,pH越大,1,2,4,5-四溴苯脱溴效率越高;pH值≥9时,pH值增大,脱溴效率保持不变.实验用Pd/C作催化剂,经处理后可重复使用,并且产物为苯,在工业上的应用非常广泛,该实验具有很高的实用性.
TV shell containing pyrolysis 2,4,6-tribromophenol, 1,2,4,5-tetrabromobenzene, PentaBDE (P5BDE), etc. will seriously affect its quality, in order to purify the TV Shell pyrolysis oil, the experiment using pure 1,2,4,5-tetrabromobenzene as raw material, in the single metal Pd / C as a catalyst, isopropanol as a hydrogen source under the conditions of catalytic debromination at the same time, studied The effect of reaction system pH (NaOH addition) on the desorption efficiency of 1,2,4,5-tetrabromobenzene was discussed. Finally, the reaction mechanism of 1,2,4,5-tetrabromobenzene in debromination was discussed. , When the temperature is set to 50 ℃, the stirring speed is set to 900r.min-1, the reaction 4h, debromination efficiency up to 100%; pH value between 0 to 9, the greater the pH, 1,2,4 , 5-tetrabromobenzene debromination efficiency higher; pH value ≥ 9, the pH value increases, the debromination efficiency remains unchanged.Experimental Pd / C as a catalyst, after treatment can be reused, and the product is benzene, In the industrial application is very extensive, the experiment has high practicality.