| 摘要 |
A porous anion exchange resin comprising the condensation resin of polyethyleneimine with an epihalohydrin, is used to remove detergents from aqueous solutions. The resin may be regenerated by treatment with aqueous alkaline sodium chloride solution. The decolorization of a molasses solution is also disclosed. Specification 650,706 is referred to.ALSO:An anion-exchange resin having a porous structure is made by condensing e.g. at 0-100 DEG C., a polyethyleneimine with an epihalohydrin e.g. epichlorhydrin, in an aqueous medium in the presence of and in intimate admixture with an organic solvent which is immiscible with water and in which the product is neither soluble nor swellable, the organic solvent being an aliphatic hydrocarbon, a cyclic alcohol or a cyclic ketone. The organic solvent which may be dispersed in the aqueous medium, may be used in amount 5-100% but preferably 10-60% by weight based on the aqueous condensation mixture. Heptane, iso-octane, white spirit, cyclohexanol or cyclohexanone may be used as the organic solvent which may be dispersed by adding emulsifiers such as oleic, linolenic, linoleic and oleinmedialanic acids. The polyethyleneimine may have a viscosity of 10,000 to 100,000 cp and the ratio of polyethyleneimine to epihalohydrin may be from 1:0.5 to 1:1 by weight. The anion exchange resin may be used for removing anions from aqueous solution particularly removing detergent from water or for clarifying molasses solution and may be regenerated by treating with aqueous alkaline sodium chloride solution. The resin may be after-treated by drying at 110 DEG C., or steaming at 100 DEG C. or by forming the quaternary salt e.g. by treating with dimethyl sulphate. Specification 650,706 is referred to. |
