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,m...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.展开更多
A new approximate concentration profile model for batch adsorption in a spherical adsorbent is proposed.The whole process of batch adsorption is divided into two stages.The first stage is that adsorption front moves f...A new approximate concentration profile model for batch adsorption in a spherical adsorbent is proposed.The whole process of batch adsorption is divided into two stages.The first stage is that adsorption front moves from the surface of particle to its center.The second stage is a process in which adsorbate is accumulated in the intraparticle.Both concentration profiles of two stages are assumed to be cubic approximation of sphere radius.Compared with exact solution and other approximate models such as parabolic concentration profile and n -th concentration profile,the new model is closely matched with exact solution and is more accurate than n -th and parabolic models,especially during the initial adsorption period when Biot number is greater.This model can be used in the calculations of complex process of unsteady adsorption of spherical adsorbent.展开更多
基金Supported by the National Natural Science Foundation of China （21004055） and the Doctoral Discipline Foundation of Education Ministry （20104101110005）.
文摘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.
文摘A new approximate concentration profile model for batch adsorption in a spherical adsorbent is proposed.The whole process of batch adsorption is divided into two stages.The first stage is that adsorption front moves from the surface of particle to its center.The second stage is a process in which adsorbate is accumulated in the intraparticle.Both concentration profiles of two stages are assumed to be cubic approximation of sphere radius.Compared with exact solution and other approximate models such as parabolic concentration profile and n -th concentration profile,the new model is closely matched with exact solution and is more accurate than n -th and parabolic models,especially during the initial adsorption period when Biot number is greater.This model can be used in the calculations of complex process of unsteady adsorption of spherical adsorbent.
