陶瓷膜复滤古龙酸超滤液中试研究

利用陶瓷膜进一步浓缩古龙酸超滤浓缩液,考察了复滤过程中的运行压力、温度、复滤时间、洗水量等因素对膜通量和古龙酸收率的影响,并对膜污染和清洗方法进行了研究。结果表明,在运行压力0.30MPa,温度40℃,古龙酸料液进一步浓缩3倍的条件下,加0.67倍水,反算收率可达96.9%,滤渣的酸量降为进料的1/10,滤渣中的酸残留总量约为3%,整个过程膜过滤平均通量维持在24.5~26.5LMH,符合工业化生产实际需要。而且实验期内,古龙酸料液未对陶瓷膜造成不可逆污染,利用市售碱性清洗剂清洗,通量可以基本完全恢复。 

A pilot-scale study on further concentrating on gulonic acid ultrafiltration concentrate using ceramic membrane

Gulonic acid ultrafiltration concentrate was further concentrated using ceramic membrane, and the effects of operating pressure, temperature, concentrating time and volume of washing water on the membrane flux and gulonic acid yield in further concentration were investigated.Besides, membrane fouling and cleaning method were also studied.The results showed that the back calculated yield was 96.9%, the acid content of filter residue reduced to 1 /10 of the feed and the total residue was about 3% after 3 times further concentration, when the operating pressure was around 0.30MPa, the temperature was about 40℃, and the volume of washing water was 0.67 times that of feed liquid.Average membrane flux maintained at 24.5²6.5LMH for the whole process, which was suitable for the real industrial production.Moreover, gulonic acid didn't cause irreversible pollution to ceramic membrane during experimental period. The flux of the ceramic membrane could be fully recoverd after washed by the commercial alkaline cleaner.