化工进展 ›› 2018, Vol. 37 ›› Issue (09): 3682-3690.DOI: 10.16085/j.issn.1000-6613.2018-0075

• 应用技术 • 上一篇    下一篇

复分解电渗析清洁生产谷氨酸钠新工艺

李帅, 王建友, 冯云华   

  1. 南开大学环境科学与工程学院, 天津 300350
  • 收稿日期:2018-01-09 修回日期:2018-04-26 出版日期:2018-09-05 发布日期:2018-09-05
  • 通讯作者: 王建友,教授,博士生导师,研究方向为膜分离与水处理技术。
  • 作者简介:李帅(1991-),男,硕士研究生,研究方向为膜分离与水处理技术。
  • 基金资助:
    国家重点研发计划(2016YFC0400707)、天津863成果转化项目(14RCHZSF00146)及天津市科技支撑项目(15ZCZDSF00020)。

A new technology for cleaner production of sodium glutamate by electrodialysis metathesis

LI Shuai, WANG Jianyou, FENG Yunhua   

  1. College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
  • Received:2018-01-09 Revised:2018-04-26 Online:2018-09-05 Published:2018-09-05

摘要: 谷氨酸钠(sodium glutamate,NaGA)是味精(monosodium glutamate,MSG)的主要成分,其传统生产方法为"等电点结晶-酸碱中和"法,传统工艺存在工艺流程长、酸碱消耗大、环境污染严重等问题,而且其谷氨酸钠产品液浓度尚未达到结晶工艺所需的浓度。为此本文提出复分解电渗析离子重组工艺来清洁生产谷氨酸钠,并对该工艺进行了实验验证及过程优化。复分解电渗析可实现原料液的一步转化,直接获得高浓度谷氨酸钠产品液,在优化条件下,最终产品液浓度为1.79mol/L (约30.2%),转化率为91.2%,能耗为2.98kW·h/kgNaGA,其副产(NH42SO4可作为生产铵肥的原料,不存在二次污染。此工艺具有工艺流程短、酸碱零消耗、无二次污染的优点,而且所得谷氨酸钠产品液浓度达到了结晶工艺所需的浓度要求,这对电驱动膜过程在味精产业的应用具有重要意义。并通过对树脂填充床电渗析与普通电渗析、均相离子交换膜与异相离子交换膜的比较实验,验证了选用异相膜树脂填充床电渗析生产谷氨酸钠的合理性。

关键词: 复分解电渗析, 谷氨酸钠, 清洁生产, 结晶

Abstract: Sodium glutamate (NaGA) is the main component of monosodium glutamate (MSG). Traditional production method is "isoelectric point crystallization-neutralization of acid and alkali". The traditional technology has problems of long process flow, acid-base consumption and environmental pollution, and its sodium glutamic concentration of product solution cannot reach the concentration required for the crystallization process. Therefore, an ion-recombination process based on electrodialysis metahesis was proposed to clean produce sodium glutamate. Experimental verification and process optimization of the electro-membrane process were carried out. Electrodialysis metathesis can realize one-step conversion of raw material solution. High concentration liquid of sodium glutamate product can be obtained directly. Under optimized conditions, the final concentration of product is 1.79mol/L (about 30.2%), the conversion rate is 91.2%, and the energy consumption is 2.98kW·h/kgNaGA. The by-product (NH4)2SO4 can be used as a raw material for producing ammonium fertilizer without secondary pollution. The process shortens the traditional process, without acid and alkali consumption, and secondary pollution. Moreover the resulting concentration of sodium Glutamate product reached the required concentration of the crystallization process, which is significant for electro-membrane process used in the MSG industry. It indicates that it is reasonable to produce NaGA by heterogeneous ion exchange membrane EDI through comparing EDI with ED and homogeneous ion exchange membranes with heterogeneous ion exchange membranes.

Key words: electrodialysis metathesis, sodium glutamate, cleaner production, crystallization

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