摘要
通过GC-MS定性分析己内酰胺成品重结晶后的杂质浓缩液，比较不同质量等级己内酰胺中的杂质差异，特别是影响挥发性碱含量的杂质。结果表明：己内酰胺成品中主要含有C3～C7，直链酰胺、肟、苯胺和已二酰亚胺等杂质，其中C3～C7直链酰胺和己二酰亚胺对挥发性碱含量影响最大，其含量增加0．1mmol／kg时，挥发性碱含量约上升0．1mmol／kg；苯胺对挥发性碱含量影响较小；肟及环状内酰胺对挥发性碱含量基本无影响。与优级品相比，己内酰胺合格品中主要含有较多的c3～c7，直链酰胺及已二酰亚胺，一级品含有微量的正戊酰胺和正己酰胺，导致挥发性碱含量超标，影响产品质量。
The compositions of impurities in the concentrated mother liquids after the recrystallizations of three various quality grades caprolactam products were analyzed by GC-MS to compare the impurities that affect the volatile base contents in these products. Results showed that the impurities were mainly composed of C3-C7 amides with straight chain, C6 imides, oximes and aniline, in which C3-C7 amides with straight chain and C6 imides had significant effect on the volatile base content：with the increase of 0. 1 mmol/kg these impurities, the volatile base content could increase 0.1 mmol/kg. Aniline had less effect on the volatile base content; oximes and lactams had little effect. As compared with the superior caprolactam product,in the qualified product impurities were mainly composed of C3-C7 amides with straight chain and C6 imides,in the first-class product minor impurities were n-valeramide and ncaproamide, however, the existence of these impurities in products leads to a higher volatile base content, which degrades the product class.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2011年第6期84-87,共4页
Petroleum Processing and Petrochemicals
基金
中国石油化工股份有限公司"十条龙攻关"项目(No.s208013)
关键词
己内酰胺
挥发性碱
重结晶
产品质量
caprolactam
volatile base
recrystallization
product quality
