摘要
为提高合成酯产品的质量和性能,对合成酯先脱酸,再分别采用萃取、蒸馏和吸附3种方法进行脱色处理。实验结果表明,脱酸不仅能脱除合成酯当中的游离脂肪酸,还能脱除部分有色杂质,脱酸后酸值从8.75降到0.40,脱色率为5.9%;萃取脱色和蒸馏脱色均不能有效地去除合成酯当中的色素;活性白土、中性氧化铝、硅藻土、凹凸棒土作为脱色剂对色素的吸附效果均不及活性炭;以活性炭为吸附剂,脱色时间55 min,温度81℃,吸附剂用量为原料质量的6.8%,合成酯脱色率为24.8%;经过脱酸、活性炭吸附脱色处理,合成酯从黄红色变成浅黄色液体,产品质量符合要求。
In order to improve the quality and performance of synthetic ester, the synthetic ester is firstly deacidified and then decolorized with extraction, distillation or adsorption, respectively. The results show that the free fatty acids and part of the coloring impurity can be removed with deacidification. The acid value reduces from 8.75 to 0. 4 and the deeoloring rate is 5.9%. However, the coloring impurity cannot be removed effectively with extraction and distillation except adsorption. The active carbon adsorbent displays better decolorization capability than active clay, neutral alumina, diatomite and attapulgite. The decolorization rate of synthetic ester with 6. 8% （wt）of active carbon adsorbent at 81 ~C after 55 minutes is 24. 8%. The yellowish red synthetic ester became pale yellow through deacidification and decolorization,which makes it meet the quality requirement of product.
出处
《现代化工》
CAS
CSCD
北大核心
2012年第9期62-65,共4页
Modern Chemical Industry
关键词
合成酯
脱色
萃取
蒸馏
吸附
synthetic ester
decoloration
extraction
distillation
adsorption
