固体超强酸催化合成PESA及其阻垢性能研究

Synthesis of Polyepoxysuccinic Acid with Solid Superacid Catalysts and Its Scale Inhibition

以马来酸酐为原料、首次应用固体超强酸SO_4^(2-)/M_xO_y为催化剂"一锅法"催化合成聚环氧琥珀酸(PESA)。采用FTIR、GPC对产物结构和分子量进行了表征,利用SEM、XRD考察了产物对Ca CO_3沉渣形貌和物相,并探讨了其阻垢机理。结果表明:8种固体超强酸SO_4^(2-)/M_xO_y中SO_4^(2-)/Ti O_2-Si O_2催化活性最好,阻垢效率高达98.87%;FTIR分析证实了产物分子结构具有羟基、羧基、C-O-C基团,聚合物为PESA;GPC分析该PESA的数均和重均相对分子量分别为1 471和1 609;SEM和XRD分析表明该PESA能有效地损伤和变形Ca CO_3沉渣的晶体习性和结构,表现了明显的晶格畸变能力。

A new facile synthesis process of polyepoxysuccinate（PESA） is proposed,which used maleic anhydride as a raw material in the presence of SO4^（2-）/MxOysolid superacid catalysts by one-pot method. The molecular weight and molecular structure of the copolymer were characterized by IR and GPC. The phase composition and morphology of Ca CO3 precipitates before and after inhibition were investigated by XRD and SEM, simultaneously its scale inhibition mechanisms were discussed. The result showed that SO4^2-/Ti O2-Si O2 catalyst is the best catalysts of eight kinds of solid superacids SO4^2-/MxOy,and its best scale inhibition efficiency of Ca CO3 is 98.87%. Number-average and weight-average molecular weight of the product PESA are 1 471 and 1 609 respectively. After the addition of inhibitor PESA,the crystal morphology of the Ca CO3 precipitates changes and their lattice are distorted,and there is a lattice distortion ability.