Abstract:

Sarcosine is a high-value fine chemical which has many significant applications. Now there is a separation process to remove the inorganic salts from the target product during the production of sarcosine. Multistage fractional crystallization is the conventional separation technology for sarcosine production which has many drawbacks such as high energy consumption, large consumption of chemicals and environmental pollution. To achieve cleaner production of sarcosine, a self-made electrodialysis stack was used in the separation and purification of the target product. The influences of current density and initial pH value in the feed solution on the production of sarcosine were investigated. Results indicated that salt removal rates higher than 99% and a product recovery ratio of 71.5% can be obtained at a current of 2 A and initial feed solution of pH 6.5. The total energy consumption for sarcosine production was 26.4 kW·h·t^-1 and the total process cost was estimated at 311 ￥·t^-1, which is much less than the conventional separation technologies. It can be seen that electrodialysis is not only energy-saving but also environment-friendly for the industrial production of sarcosine.

Key words: ion exchange membrane, electrodialysis, sarcosine, cleaner production

摘要：

肌氨酸作为一种高附加值的精细化工产品具有广泛的应用前景。目前肌氨酸的生产过程中存在肌氨酸产品与无机盐的分离过程。传统的分离方法为分步结晶法,存在能耗高、消耗的化学试剂多、污染大等缺点。为实现肌氨酸的清洁生产,本文采用自制电渗析装置对肌氨酸进行分离纯化,考察了操作电流以及溶液起始pH对整个分离效果的影响。结果表明,当操作电流为2 A,起始pH为6.5时,电渗析过程中无机盐的去除率大于99%,其产品得率为71.5%,电渗析工艺生产肌氨酸的能耗为26.4 kW·h·t^-1,总成本仅为311元·t^-1,大大优于传统的生产工艺。由此可见,电渗析工艺可实现肌氨酸产品的节能、环保生产。

关键词: 离子交换膜, 电渗析, 肌氨酸, 清洁生产