摘要
采用山梨酸和碳酸钠固相反应生产山梨酸钠过程中,会出现反应体系温度突然升高,反应物粘接,反应不易进行彻底,碱的加入量超过化学反应比例等问题,从而影响反应的进行和产品质量。为解决这些问题,利用X-射线衍射、扫描电镜、差热及热重分析方法,对其固相反应过程的微观变化特征进行研究,结果表明:山梨酸与碳酸钠固相反应产生的热、水及研磨力是固相反应进行的内在动力,山梨酸晶体崩解是反应体系温度快速升高最重要的原因;中和反应生成的水会使物料之间产生粘接,在其后有一部分成为山梨酸钠的结晶水;碳酸钠在反应过程生成碳酸氢钠是影响碱超标、反应不易进行彻底等问题的最直接原因。
During the solid-phase reaction process of sodium sorbate and sodium carbonate to produce sodium sorbate, here appeared that the temperature of reaction system jumped higher, reactants bounding which lead to the reaction uncontrollable and the addition of sodium carbonate more than chemical reaction needed. These results would affect practical reaction process and the quality of the resulting product. In our presented study, X-ray diffraction analysis, scanning electron microscopy analysis, differential thermal and thermogravimetry analysis were used to study solid reaction process of sodium sorbate and sodium carbonate, and its micro scopic variety characteristics. The results showed the heat, water produced during reaction and the milling and grinding force applied in solid-phase reaction of sodium sorbate and sodium carbonate trigged the occurrence of the reaction and considered to be the internal driving force of the reaction, while the collapsing of sorbic acid crystal was to be the most important factor for the rapid increase of reaction temperature in reaction system. The water produced in neatralizing reaction led to the reactants bounded during rection, and part of them would become crystal water of sodium sorbate. Also, the generation of sodium bicarbonate from sodium carbonate accounted directly for the excess addition of sodium carbonate and reaction could not progress to end.
出处
《中国食品学报》
EI
CAS
CSCD
北大核心
2011年第8期175-182,共8页
Journal of Chinese Institute Of Food Science and Technology
基金
北京市科技成果转化与产业化(PXM2011_014207_000070)
关键词
山梨酸
碳酸钠
固相反应
差热及热重分析
X-射线衍射
扫描电镜
sorbic acid
sodium carbonate
solid-phase reaction
TG/DTA analysis
X-ray diffraction analysis
scanning electron microscopy analysis
