Study on Potassium Hydroxide Deep Eutectic Solvent for Pine Wood Pre treatment
In order to efficiently remove lignin and enhance the enzymatic hydrolysis efficiency of pine wood,potassium hydroxide deep eutectic solvent was used for pretreatment of pine wood.Four potassium hydroxide deep eutectic solvents were mainly screened the pretreatment process conditions were optimized.The results showed that the pretreatment effect of potassium hydroxide:monoethanolamine(molar ratio of 1∶3)was the best.Under the conditions of a temperature of 110 ℃,a time of 5 h,and a solid-liquid ratio of 1∶15,the removal rate of lignin reached 95.31％,and the yield of reducing sugar after 72 h of enzymatic hydrolysis of pretreated residue reached 82.89％.Meanwhile,comparing the pH and viscosity of different deep eutectic solvents,it was found that the pretreatment effect of potassium hydroxide deep eutectic solvents was mainly affected by pH and viscosity,with pH playing a major role.The mechanism of potassium hydroxide deep eutectic solvent pretreatment of pine wood was deeply studied using Fourier transform infrared spectroscopy,scanning electron microscopy and X-ray diffraction characterization methods.
potassium hydroxide based deep eutectic solventspretreatmentpineligninenzymatic hydrolysis
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