EDTA-金属配合物催化氧化降解羟丙基瓜尔胶  

Catalytically Oxidative Degradation of Hydroxyethyl Guar Gum by EDTA-Metal Complex

作　　者：张洁[1] 杨朋威 陈刚[1] 王海洋[1] 段琴琴[1] 张付共 张建甲 

机构地区：[1]西安石油大学化学化工学院,西安710065 [2]北京华盛坤泰环保科技有限公司,北京100142

出　　处：《精细石油化工进展》2016年第6期1-4,共4页Advances in Fine Petrochemicals

基　　金：国家自然科学基金项目(50874092)"环保型聚糖-木质素钻井液体系的应用基础研究";陕西省大学生创新创业训练计划项目"高pH下油气油田聚合物的清洁降解"

摘　　要：选取Fe^(2+),Fe^(3+),Co^(2+),Ni^(2+),Cu^(2+),Zn^(2+)6种金属盐与乙二胺四乙酸(EDTA(L))反应制备相应的配合物,评价了其配合物在高p H条件下催化H_2O_2氧化降解羟丙基瓜尔胶的效果。结果表明,该系列配合物均具有一定的催化效果,其中Fe(Ⅱ)L效果最好,在p H<13.0范围内均具有较好的催化效果。在温度为45℃,体系pH为9,H_2O_2加量为羟丙基瓜尔胶质量的10.0%,Fe^(2+)和EDTA物质的量比为1∶1,催化剂Fe(Ⅱ)L加量为H_2O_2加量的2.0%,降解40 min后,该体系可将羟丙基瓜尔胶的相对黏度降至1.5,黏均相对分子质量从2×106降至3 199,COD值从22.5 g/L降至7.6 g/L;H_2O_2加量为25%时,4 h可将COD值降至104 mg/L。Six metal salts,i. e. Fe^2＋,Fe^3＋,Co^2＋,Ni^2＋,Cu^2＋and Zn^2＋,were selected to react with ethylenediamine tetraacetic acid EDTA（ L） for preparing corresponding complexes,and the effects of the complexes in oxidatively degradating hydroxypropyl Guar gum by catalyzing H2O2 at high p H values were evaluated. The results of study have shown that this series of complexes have the catalytic effect to a certain extent with Fe（ Ⅱ） L being the best and that they all have good catalytic effect when the p H value is larger than 13. 0. When the temperature is 45 ℃,the p H value of system is 9,the addition of H2O2 is 10. 0% of the mass of hydroxypropyl Guar gum,the molar ratio of Fe^2＋to EDTA is 1 ： 1,and the addition of catalyst Fe（ Ⅱ） L is 2. 0%,this system can reduce the relative viscosity of hydroxypropyl Guar gum to 1. 5,reduce the viscosity average relative molecular mass from 2 × 10^6 to 3 199,and reduce COD from 22. 5 g/L to7. 6 g/L after 40 min of degradation. When the addition of H2O2 is 25%,this system can reduce COD to104. 0 g/L in 4 h.

关 键 词：金属配合物 催化氧化 乙二胺四乙酸 羟丙基瓜尔胶 金属盐 

分 类 号：O641.4[理学—物理化学] O643.36[理学—化学]