超临界水中蔗渣的液化反应及其产物的结构表征  

Liquefaction of Bagasse in Supercritical Water and Characterization of Liquefaction Products

作　　者：谌凡更[1] 吴健[1] 岳小鹏[1] 

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640

出　　处：《林产化学与工业》2009年第5期79-86,共8页Chemistry and Industry of Forest Products

基　　金：广东省自然科学基金资助项目(05006545);国家863计划资助(2007AA100704)

摘　　要：以Na2CO3、K2CO3、NaOH为催化剂,在375-400℃的超临界水中进行蔗渣的液化反应。考察了液固比、反应时间、反应温度和催化剂对蔗渣液化的影响。在380℃、液固比18∶1（质量比）、反应时间20 min条件下,NaOH或Na2CO3催化剂用量为1%时,液化残渣率降到10%以下,而在同样条件下,KCO催化剂用量为3%时,液化反应的残渣率降到7%以下。对液化产物进行了表征。GC-MS分析表明,液体产物的主要组成是含环状结构的酮和一些含甲基、羟甲基等官能团的苯酚类化合物,气体产物主要为C1-C4烷烃和CO、CO2、H2等无机气体,且其组成因液化温度而变化。液化残渣经过FT-IR分析和扫描电镜分析,发现其主要由焦炭以及尚未完全分解的木质素组成。Bagasse was liquefied in supereritical water at 375-400℃ in the presence of Na2CO3 , K2CO3, or NaOH as catalyst. The effects of liquid ratio, time, temperature and catalyst on the liquefaction were investigated. The minimum residue yield of 10 % was achieved at 20 min when liquefaction was conducted at 380 ℃ with liquid-solid ratio 18：1 and Na2CO3 （or NaOH） dosage 1%. The residue was below 7 % under similar condition when the dosage of K2CO3 was 3 %. Liquid products of the reaction comprised of cyclic ketone and various phenolic compounds containing methyl and hydroxyl groups. Gaseous products formed during liquefaction, which were C1-C4 hydrocarbons, CO, CO2 and H2, varied with temperature. Solid residues were composed of char and residual lignin, according to FT-IR and SEM analysis.

关 键 词：液化 超临界水 蔗渣 催化剂 

分 类 号：TQ353.422[化学工程]