醋酸水溶液预处理对柳杉木材炭化的影响

杉木(日本柳杉)经醋酸水溶液处理后，重量减少。将处理前后柳杉木材在4℃下进行炭化，得到了木醋液、木焦油和木炭。与未处理材相比，处理材木醋液的收率增加，而木焦油和木炭的收率减少。处理液的醋酸浓度增加后，木醋液和木焦油的收率几乎不变，但木炭的收率稍微减少了。用毛细管气相色谱法对木醋液的成分进行了定量分析。与未处理材相比，处理材木醋液中糠醛(呋喃甲醛)及5-羟甲基糠醛的收量增加，而羧酸类、苯酚类、邻苯二酚、愈创木酚类及麦芽酚的收量几乎不变。当醋酸浓度从0增至3％时，糠醛的收量随着增加，但是当醋酸浓度从3％增至30％时，其收量却几乎不变。

EFFECT OF PRETREATMENT WITH ACETIC ACID AQUEOUS SOLUTION ON CARBONIZATION OF SUGI(CRYPTOMERIA JAPONICA D.Don) WOOD

Sugi woods treated with acetic acid aqueous solution were found to become lighter in weight.Treated and untreated sugi woods were carbonized at 400 ℃ to afford wood-vinegar,wood-tar and charcoal.Yield of wood-vinegar from the pretreated wood was increased,but yields of wood-tar and charcoal were decreased.Yields of wood-vinegar and wood-tar were almost constant,though yield of charcoal was slightly decreased with the increase of acetic acid aqueous solution concentration.Components in wood-vinegar from the treated and untreated sugi woods were determined by capillary gas chromatography (capillary GC).Amounts of 2-furaldehyde and 5-hydroxymethyl-2-furaldehyde in wood-vinegar from the treated wood were increased,but amounts of carboxylic acids,phenols,pyrocatechol,guaiacols,and maltol were almost constant.Amount of 2-furaldehyde were increased with the increase of acetic acid aqueous solution concentration from 0 to 3%,and almost constant from 3% to 30%.