摘要
采用离心、抽滤等分离方法,大幅度减少褐煤中的杂质,提取腐植酸,分析测定了腐植酸中羧基、羰基、甲氧基及总酸性基等官能团和氮元素的含量。考察了褐煤氧化氨解过程中,上述官能团的变化规律和反应前后氮含量的变化。结果表明,氧化氨解过程可使腐植酸中总氮含量显著增加;引起腐植酸各官能团含量的显著变化。其中,反应温度和氧压对氧化氨解反应影响显著,温度和氧压越高,羧基和总酸性基的含量越多,甲氧基和羰基的含量越少;氨水浓度对氧化氨解反应影响不大,氨水浓度增高,羧基和总酸性基基本不变,甲氧基和羰基略有减少。
Humic acid （HA） was extracted from brown coal, the impurities in which were greatly decreased previously by centrifugalization and sucking filtration. The nitrogen content and significant group contents in the extractive, such as the contents of carboxyl group, carbonyl group, methoxyl group and total acidic group, were analyzed respectively. The variation regularity of the groups and the change of nitrogen content during the ammoxidation process were investigated. The results show that the nitrogen content increases evidently and the group contents change also obviously. During ammoxidation, the reaction temperature and oxygen pressure affect the ammoxidation evidently. It was found that the higher the reaction temperature and oxygen pressure, the more carboxyl group content and total acid group content, and the fewer the methoxyl group content and carbonyl group content. But the effect of ammonia concentration on the reaction is not evident. When the used ammonia concentration was elevated, the methoxyl group content and carbonyl group content decrease a little and the carboxyl group content and total acidic group content are almost unchanged
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2010年第3期446-450,共5页
Journal of Chemical Engineering of Chinese Universities
关键词
氧化氨解
褐煤
腐植酸
官能团
ammoxidation
brown coal
humic acid
group
