酸性溴化锂熔盐水合物溶解木质素的实验研究

EXPERIMENT STUDY ON DISSOLVED LIGNIN IN ACID LITHIUM BROMIDE FUSED SALT HYDRATE

以溴化锂对木质素的溶解为研究基础,研究溴化锂浓度及反应温度对纯化后酸性玉米芯木质素溶解性能的影响,使用傅里叶红外光谱仪(FTIR)表征溶解前后木质素的官能团,得出最适合溶解木质素的条件:溴化锂浓度为60%,反应温度为120℃最适合木质素溶解;酸性溴化锂熔盐水合物能选择性裂解木质素β—O—4芳基醚键,木质素的α—OH在溴化锂作用下发生溴化,从而在温和条件下导致部分木质素发生溶解,并且LiBr和HCl在催化醚键中起到重要作用。

To lignin with lithium bromide as the research foundation,the dissolution of the lithium bromide concentration and reaction temperature on the properties of lignin dissolved acid purified cod,using Fourier infrared spectrometer(FTIR)characterization of dissolved lignin before and after functional group,it is concluded that the most suitable for the conditions of the dissolved lignin:lithium bromide concentration is 60%,the reaction temperature is 120℃is most suited to lignin dissolved.Acid lithium bromide molten salt hydrate can selectively crack ligninβ—O—4 aryl ether bonds.The bromination ofα—OH of lignin under the action of lithium bromide leads to partial dissolution of lignin under mild conditions.LiBr and HCl play an important role in catalytic ether bonds.