丁醇萃取发酵耦联生产改良型生物柴油过程的性能优化

Performance Optimization of Property-improved Biodiesel Manufacturing Process Coupled with Butanol Extractive Fermentation

摘要:

传统丙酮丁醇发酵的产物浓度太低, 蒸馏回收发酵产品大量耗能。为研究探讨直接利用发酵产物的可能性, 在15%高初始玉米醪浓度条件下、以地沟生物柴油为萃取剂, 探讨了生物柴油添加量、萃余液回用率、和添加微量电子供体对丁醇发酵耦联生产改良型生物柴油过程各主要性能指标的影响。通过环境条件优化, 地沟生物柴油的质量显著提高, 16烷值由51.4提高至54.4; 添加微量中性红后“丁醇实质性得率”可以达到18%, 耗能的发酵产品回收过程有望省去; 萃余液回用率超过50%, 有望逐步向国家所大力倡导的“节能减排”的工业生产模式靠近。

Abstract:

The products concentrations in traditional acetone-butanol (AB) fermentation are too low that large amount of energy has to be consumed in the distillation and product recovery process. Aiming at direct utilization of the fermentation products, in this study, optimization of property-improved biodiesel manufacturing process coupled with AB extractive fermentation was conducted, under the condition of using the biodiesel originated from waste cooking oil as the extractant and high concentrated corn flour medium. The effect of biodiesel/broth volume ratio, waste supernatant recycle ratio, and electronic carrier addition on the major process performance index was carefully investigated. Under the optimized condition, the biodiesel quality was improved with the cetane value increased from 51.4 to 54.4; “actual butanol yield” reached to a level of 18%, and waste supernatant recycle ratio exceeded 50%. In this way, elimination of energy-consuming product recovery process and realization of “energy-saving & waste minimization” industrial production target advocated by the state government, could be potentially expected.