弱碱型离子交换纤维对铬酸雾的吸附性能研究

为了抑制镀铬工业中产生的铬酸雾,分别利用腈纶基弱碱型离子交换纤维和脱脂棉对铬酸雾进行了吸附研究.结果表明:弱碱离子交换纤维连续使用150 h吸附铬酸雾1.26 mg,且尾气浓度低于0.005 mg/m3,远低于国标规定的铬酸雾排放标准(0.05 mg/m3);脱脂棉在连续使用55 h后尾气排放超标,尾气浓度为0.069 mg/m3;通过4次再生吸附实验,弱碱离子交换纤维保持了良好的吸附与机械性能,在含铬废气治理中有很好的应用前景.     

Two Organic Phase Suspension Polymerization for Novel Hypercrosslinked Resin Bead by Polycondensation of CMB

The suspension polymerization with two organic phases was adopted to prepare spherical hyper- crosslinked resin by self-polycondensation of 4,4＇-bis-（chloromethyl）- 1, 1＇-biphenyl （CMB）. The chemical structure,morphology and pore characteristics of the novel spherical resin were characterized with Fourier transform infrared spectroscopy （FTIR）, micrograph and Brunauer-Emmett-Teller （BET）. It is found that the suspension system and stirring speed impose a great influence upon the regularity and size distribution of hypercrosslinked beads. To prepare CMB resin beads with diameter of about 300 μm, the optimal condition is as follows： stirring speed 300 r·min^-1, and the volume ratio of the two organic phases （nitrobenzene/dimethyl silicon oil） 1 ： 5. After the self-polycondensation and sqccedent post-crosslinking of CMB monomer, the spherical adsorbent presents high spec~al surface area （1190 m^2· g^-1） and abundant pore~volume （0.714 cm^3· g^-1）, and could be potentially applied qn the adsorption of various organic molecules and synthesis of porous ion exchanger.