摘要
琼脂生产企业产生大量的废碱液,具有氢氧化钠和有机物含量高的特点.运用扩散渗析法从琼脂加工废碱液中回收碱,考察扩散时间、料液流速、水/料流速比、温度等因素对碱回收的影响.结果表明,碱回收率随料液流速的增大而逐渐下降,随水/料流速比的增大而增加,随温度升高而增加.当进料液中碱含量为1.5 mg/L、料液流速1.0 L/(m2·h)、水/料流速比1.2、温度65 ℃、扩散时间为1.5 h时,碱回收率74.25％,可获得浓度为1.12 mol/L的碱液.研究表明,扩散渗析能有效实现碱与有机物的分离,所回收的碱液可重新用于琼脂生产.
Abstract
Agar production enterprises produce a large amount of waste alkali liquor,which has the characteristics of high sodium hydroxide content and high organics content.The diffusion dialysis method was used to recover alkali from the waste alkali liquor generated during agar production,and the influence of some factors,such as the diffusion time,feed flow rate,ratio of water to feed flow,and feed temperature on the alkali recovery,were investigated.The results show that the alkali recovery efficiency decreases gradually with the increase of feed flow rate,increases with the increase of ratio of water to feed flow,and feed temperature.When the concentration of alkali in feed solution is 1.5 mol/L,the feed flow rate is 1.0 L/(m2·h),the ratio of water to feed flow is 1.2,the temperature of feed solution is 65 ℃,and the diffusion time is 1.5 h,the recovery efficiencey of alkali of 74.25％and alkali concentration of 1.12 mol/L could be obtained.It showed that diffusion dialysis was a very effective method for the separation of alkali and organic matter,and the recovered alkali solution can be reused for agar production.
基金项目
福建省科技计划引导性项目(2020Y0040)
集美大学创新创业训练计划项目(2022xj122)
维普
万方数据