摘要
首先研究了生物质派生的竹浆和糠醛渣在多次投料和补加硫酸的条件下水解制备乙酰丙酸(LA)的过程.实验结果表明,酸水解过程会消耗溶液中的H+,通过补加硫酸维持水解液pH可以保证后续投料水解反应顺利进行,最终得到含高浓度LA的生物质水解液.此外,利用配制的模拟水解液研究了电渗析过程对原料液中LA、硫酸和甲酸(FA)三者分离的影响.结果表明:当硫酸存在时,大多数SO 42-及少量的LA和FA在电渗析过程中被分离;当原料液电导率降为0时,SO4^2-被完全除去,同时LA和FA在电渗析过程中开始被快速地分离.最后,使用电渗析法处理真实的生物质水解液除去其中的SO4^2-,并采用蒸馏法提纯LA.最终LA的回收率为87.1%,并且分离得到的硫酸溶液可以进行重复利用.
We initially studied the process of levulinic acid(LA)production by multi-feeding of biomass-derived bamboo pulp and furfural residue under the condition of sulfuric acid supplement.The experimental results illustrated that H+in hydrolysate were consumed in the process of acid hydrolysis.The pH value of the hydrolysate could be recovered by the addition of sulfuric acid,guaranteeing that the sequential hydrolysis reactions could be successfully conducted to obtain the biomass hydrolysate with high concentration of LA.In addition,the effects of electrodialysis on the separation of LA,sulfuric acid and formic acid(FA)in the aqueous solution were studied using the simulated hydrolysate.It was found that most SO 42-and a small amount of LA and FA were separated during the electrodialysis process in the presence of sulfuric acid.When the conductivity of the material solution dropped to 0,SO4^2-was completely removed,and LA and FA were then rapidly separated in the electrodialysis process.Finally,the electrolyzed solution was used to treat the real biomass hydrolysate to separate SO4^2-,and LA was purified by the subsequent distillation.As a result,the recovery rate of LA was 87.1%,and the separated sulfuric acid solution could be reused.
作者
龚晨
唐兴
曾宪海
孙勇
林鹿
GONG Chen;TANG Xing;ZENG Xianhai;SUN Yong;LIN Lu(Xiamen Key Laboratory of Clean and High-valued Applications of Biomass,Xiamen University,Xiamen 361102,China;Fujian Engineering and Research Center of Clean and High-valued Technologies for Biomass,Xiamen University,Xiamen 361102,China)
出处
《厦门大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第6期848-854,共7页
Journal of Xiamen University：Natural Science
基金
国家自然科学基金（21706223,21776234,21676223）
中国石油天然气集团有限公司创新基金（2018D-5007-0503）
关键词
乙酰丙酸
电渗析
提纯
生物质
levulinic acid
electrodialysis
purification
biomass
