摘要
以K2CO3为催化剂,甲醇为溶剂,在不锈钢高压反应釜内进行了竹材的超临界条件下的醇解反应,用气相色谱-质谱联用仪(GC-MS)定性分析了醇解产物的成分。分别考察了反应温度、反应时间和催化剂用量对竹材醇解转化率的影响。结果表明,当达到甲醇超临界状态时,不论是否添加催化剂,竹材的醇解转化率都有一个明显的突跃;添加K2CO3催化剂后,超临界醇解转化率明显升高,K2CO3催化剂有利于溶解木素,并生成苯酚和酚类化合物,而且减少了氧杂环的生成,醇解液体产物中没有半纤维素和纤维素醇解的主要产物糠醛,甲酯类等有机小分子的含量变化较大,乙酸甲酯、丙酸甲酯和丁酸甲酯等含量均有大幅度提高。
Bamboo powder （BP） was alcoholyzed under supercritical condition in a stainless-steel autoclave using K2CO3 as catalyst and methanol as solvent. The alcoholysis products were qualitatively analyzed by gas chromatography-mass spectrometer （GC-MS）. The effects of reaction conditions（temperature, time and catalyst dosage） on the conversion of BP were investigated. The results showed that the conversion had a steep increase in supercritical methanol in presence or absence of catalyst. The conversion of bamboo obviously increased during alcoholysis in supercritical methanol after adding K2CO3. Addition of K2CO3 catalyst could lead to the dissolution of lignin and the formation of phenol and phenolic compounds. It was also found that addition of K2CO3 catalyst could restrain the formation of the oxygen heterocyclic compounds. The main product from aicoholysis of hemicelluiose and cellulose wasn＇t detected. The contents of methyl esters （methyl acetate, methyl propionate, and methyl butyrate） significantly increased.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
2012年第6期540-545,共6页
Chemical Reaction Engineering and Technology
基金
浙江省先进催化技术创新团队基金(2009R50020)
关键词
竹材
超临界醇解
碳酸钾
生物质
bamboo
alcoholysis in supercritical methanol
potassium carbonate
biomass
