杉木树皮的苯酚液化研究

Liquefaction of Chinese fir bark in the presence of phenol

以苯酚为液化剂,对杉木Cunninghamia lanceolata树皮进行了液化实验。分析了反应温度、液比(苯酚与杉木树皮的质量比)、催化剂的种类和用量及液化时间对液化反应的影响。结果表明:与盐酸和磷酸相比,硫酸对杉木树皮的液化具有较好的催化效果;适宜液化工艺条件为:以72%(720 g.kg-1)硫酸为催化剂,用量为0.15 mL.g-1,液化时间为1.0 h,反应温度为150℃,液比为3,此时液化残渣率为9.97%。利用傅里叶红外光谱(FTIR)分析了杉木树皮及其液化产物的结构特征,结果显示杉木树皮的化学组分发生了明显的酚化反应。

To assess the feasibility of using Cunninghamia lanceolata（Chinese fir） bark as a raw material for the formulation of phenol based adhesives,the liquefaction technique for Chinese fir bark was studied using phenol as the liquefacient.The effects of reaction temperature,liquid ratio（phenol/Chinese fir bark）,reaction time,as well as kinds and usage of catalysts [hydrochloric acid（HCl）,phosphoric acid（H3PO4）,and sulfuric acid（H2SO4）] on liquefaction were investigated.Also,Fourier transform infrared spectroscopy（FTIR） was used to characterize the structure of Chinese fir bark and its liquefaction products.Results showed that,compared to HCl and H3PO4,H2SO4 had an excellent catalytic effect on the liquefaction of Chinese fir bark,and that a lower residue yield was obtained.Optimum liquefaction conditions were： liquefaction time 1.0 h,liquefaction temperature 150 °C,liquid ratio 3/1,H2SO4 as a catalyst 72%（720 g·kg-1）,and catalyst dosage 0.15 mL·g-1.With these conditions,the liquefaction residue rate was 9.97%.This indicated that the chemical components of Chinese fir bark were subjected to phenolization reactions.With additional studies of resole formation and glue mix formulations,it is anticipated that a resin adhesive from liquefied Chinese fir bark with improved bond quality can be developed.[Ch,6 fig.1 tab.20 ref.]