摘要
为了解决精氨酸生产过程中的无机酸回收和循环再利用问题,采用阴膜扩散渗析法,针对模拟的精氨酸和盐酸混合液,在静态扩散条件下测定了盐酸的渗析系数,并考察动态扩散渗析操作参数如流速、流速比对酸回收率的影响.结果表明,采用DF-120阴离子交换膜,在静态扩散渗析中,盐酸能够顺利地透过膜,精氨酸几乎不能透过;动态扩散实验中流速、流速比对酸的回收率和回收酸的浓度有重要影响:随着流速的增加,盐酸的回收率逐渐降低,精氨酸的截留率基本上没有改变,均达到98.5%以上;流速为2mL/min时,盐酸回收率最高,可达82%;水/料液流速比增大时,盐酸的回收率增大,但是过高的水/料液流速比又会使回收酸的浓度降低.经济核算表明,对于一个年产30t精氨酸的装置,相对于中和法,膜扩散渗析法一年能节省的化学原料总费用约98万元,投资回收期为8个月.
Diffusion dialysis with DF-120 anion exchange membrane was adopted to achieve the objective of waste hydrochloric acid recycling and reusing during the arginine （Arg） production process. The experiment was performed in a series of static and dynamic tests with a mixed arginine and HC1 industrial simulated waste acid. The diffusion dialysis coefficient of HC1 across the chosen DF-120 anion exchange membrane was measured in the static test, while the effects of some operation parameters such as flow rate and flow rate ratio on the performance of the diffusion dialysis process were investigated in the dynamic test. The results from the static experiment indicated that HC1 could transport across the membrane while Arg was completely rejected and it could not be detected in the diffusate solution. The dynamic experimental results showed that the performance of the diffusion dialysis process was declined with the increase of flow rate, but enhanced with the increase of flow rate ratio. A high Arg rejection ratio of about 98. 5 % could be obtained and there was no obviously change of this ratio during the recovery process. The concentration of HC1 in the diffusate and dialysate were decreased with the increase of water flow rate. A maximum HC1 recovery ratio of about 82% could be achieved at a flow rate of 2 mL/min. A preliminary economic evaluation indicated that a 30 t/a Arg plant could save ￥98 000 per year compared with the conventional neutralization method for spent hydrochloric acid. The diffusion dialysis system also revealed that the investment-recovered period was as short as about 8 months.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2012年第4期102-106,共5页
Membrane Science and Technology
基金
安徽省高等学校省级自然科学研究重大项目(ZD200901)
安徽省教育厅重点基金(KJ2008A072
KJ2009A003)
关键词
酸回收
扩散渗析
膜
精氨酸
acid recovery
diffusion dialysis
membrane
arginine
