Research On The Influence Of Particle Size And Range Of Styrene-based Gel Resin On Its Properties

Styrene-based gel resins have excellent performance,such as stable physical and chemical properties,high mechanical strength,high exchange capacity,which have been widely used in water treatment,metallurgical industry,food industry,medical industry,atomic energy industry and so on.Domestically-made styrene-based gel resins are prepared by traditional suspension polymerization and post-functionalization.Those microspheres,also called “white balls”,have a wide size distribution,which would increase the flow resistance in the application of resin,since the small particles would be filled between the resin gaps during filling process.This could further result in poor resistance to osmotic pressure and short service life.To tackle this issue,styrene-based gel resins were sieved into several particle size ranges.And the influence of particle size and range on the properties was investigated,such as physical and chemical properties,process performance,mixed-bed water treatment.In the first part of this thesis,the influence of particle size and range on the physical and chemical properties of 001×7 and 201×7 resins were investigated respectively.The results showed that:(1)Resin 001×7 with particle size in 0.50~0.71 mm had better physical and chemical properties,such as higher mass exchange capacity,higher grinding ball rate,and higher infiltrated and polished strength;(2)For resin 201×7 resin with particle size in the range of 0.45~0.60 mm had better physical and chemical properties.In the second part of this thesis,the influence of particle size and range on the work performance of 001×7 and 201×7 resins were investigated respectively.And the influence of temperature and running flow rate on the actual working exchange capacity of resin 001×7(0.50~0.71mm)and resin 201×7(0.45~0.60mm)were explored.The results showed that:(1)Resin 001×7(0.50~0.71mm)and resin 201×7(0.45~0.60mm)had better work performance;(2)With the increase of flow rate,the actual working exchange capacity of resin 001×7(0.50~0.71mm)and resin 201×7(0.45~0.60mm)decreased slowly;(3)With the increase of temperature,the actual working exchange capacity of resin 001×7(0.50~0.71mm)and resin 201×7(0.45~0.60mm)increased slowly.Finally,the influence of particle size and range,as well as resin ratio,running flow and experimental water quality on the mixed-bed water treatment.Results showed that:(1)Mixed bed composed of cation resin 001×7(0.50~0.71mm)and anion resin 201×7(0.45~0.60mm)had the largest water treatment capacity;(2)Performance of mixed-bed would be better,if increasing the anion exchange resin;(3)Water treatment capacity of the mixed-bed resin would be lower down,if the operation flow is too high or too low,since the total ion content of experimental water would be too high.