Sythesis,Thermal Stabilities And Applications Of Stronge Base Anion Exchange Resin With Alkylene Spacer Chains

Styrene-based strongly basic anion exchange resins have been effectively used for a variety of fields such as water treatment, hydrometallurgy, chemical industry, bioindustry and so on. However, the thermal stability of commercial anion exchange resins is poor. The low thermal stability of the exchange of the OH form is well known to be due to the increased reactivity(decreased stability) of the benzylic carbon, which is attached directly to the quaternary nitrogen atom. Lots of articles reported that the introduction of spacer chains between the benzene ring and the quaternary nitrogen in the anion exchangers is expected to be effective in order to increase the stability of the exchangers. However, these methods of synthesis route long, harsh operating conditions, polymer properties was very poor to be due to difficult monomer separation and purification.This paper reported a novel method for the synthesis of anion exchange resins with alkylene spacer chains. The thermal stability and the catalytic activity of the resins was examined. The result indicated that:1. This paper summarized research progress of heat-resistant strongly basic anion exchange resins at home and abroad.2. This paper reported a novel method for the synthesis of anion exchange resins, beginning with the alkalization of polystyrene-divinyl -benzene resin treated by 1,3-oxazinan-2-one with ionic liquids of the quaternary ammonium form as catalyst, followed by N-methylation in formic acid and formalin, the title resin(NCN-4) was prepared with the strong base exchange capacity of 1.86mmol/g after the final quaternization by bromoethane.3. The weak base exchange capacity of the resin achieve 2.38mmol/g and ratio of ionic liquids 2, temperature 130℃, time 24h is its optimum conditions in orthogonal experiments of the alkalization of polystyrene-divinylbenzene resin.4. The thermal stability order of S201 resin with different ionic forms in 100℃: Cl form> HCO3 form> CO3 form> OH form. The thermal stability order of S201 resin with HCO3 form in different solvent systems:EO and water> water> EG. 5. The exchange capacity of the resin with the strong base exchange capacity of 1.86mmol/g in this article only dropped 11.83 percent after standing in deionized water at 100℃for 720 hours, and this property was better than the general commercial resins.6. Using NCN-4 resin as catalyst, it achieved a conversion rate of 98% and ethylene glycol selectivity 93% and the pressure 1.8MPa, the reaction temperature 90℃, the bed temperature 85℃, the space velocity 0.17h-1, the water rate 6.4 is its optimum conditions, and this property was better than D201 resins.