响应曲面法优化酸/盐催化玉米芯产糖的工艺

Optimization of Hydrolysis Conditions of Corn Cob in the Presence of Acid/Salt Catalysts forFermentable Sugars by Using Response Surface Methodology

将生物质水解转化成可发酵糖是生物转化利用的重要途径。本研究以玉米芯为原料,在传统单酸催化剂水解的基础上,研究了H2SO4/Fe2(SO4)3催化剂对玉米芯水解产糖的影响,结果表明:当单独采用H2SO4或Fe2(SO4)3催化玉米芯水解时,总糖产率均低于40%;而将H2SO4、Fe2(SO4)3混合后催化水解时,总糖产率高于使用2种单催化剂所得总糖产率之和。采用响应曲面法优化了H2SO4/Fe2(SO4)3催化玉米芯水解的工艺条件,通过验证实验得到:当H2SO4浓度为0.7 mol/L,Fe2(SO4)3浓度为2.0 mol/L,反应温度为150℃,时间为47 min时,玉米芯水解所得的总糖产率最高,为79.98%。本研究通过对玉米芯水解条件的优化,提高了玉米芯水解制糖的产率,为玉米芯的高值化利用奠定应用基础。

Hydrolysis of biomass into fermentable sugars is a significant way in the application of biomass conversion.In this paper, selecting corn cob as raw material, effects of sulfuric acid(H2SO4)/ferric sulfate(Fe2(SO4)3) on the hydrolysis of corn cob were investigated. The results showed that: Only <40% of total sugaryield were obtained, when using H2SO4,orFe2(SO4)3as catalyst,respectively. However, nearly 80% of total sugaryield could be achieved, if H2SO4 and Fe2(SO4)3were mixed together,which was more than the sum of sugarrecovery with H2SO4 orFe2(SO4)3as single catalyst,respectively. Response surface methodology was used to optimize the hydrolysis conditions of corn cob in the presence of H2SO4/Fe2(SO4)3, the verification experiment indicated that when the concentration of H2SO4 was 0.7 mol/L, Fe2(SO4)3concentration was 2.0 mol/L, 79.98% of total reducing sugars could be obtained at 150 ℃ after47 min of reaction. Through the optimization of the hydrolysis condition of corn cob, the fermentable sugars yield was enhanced, which provided an important application basis forthe effective utilization of corn cob.