Jiangsu Provincial Key Laboratory of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China.
Bioresour Technol. 2012 Nov;124:299-305. doi: 10.1016/j.biortech.2012.08.054. Epub 2012 Aug 23.
Green liquor consists of sodium carbonate and sodium sulfide and is readily available in any kraft mills. The green liquor pretreatment process for bioethanol production was developed for wood chips. This process uses only proven technology and equipment currently used in a kraft pulp mill and has several additional advantages such as high sugar recovery and concentration, no inhibitive substances produced, as compared to acid-based pretreatment methods. The liquor was used to pretreat corn stover for enhancing enzymatic hydrolysis in bioethanol production. Pulp yield of 70% with 45% lignin removal was achieved under optimized conditions (8% total titratable alkali, 40% sulfidity and 140°C). About 70% of the original polysaccharides were converted into fermentable sugars, using 20 FPU/g-pulp of enzyme in the subsequent enzymatic hydrolysis. The result indicates that green liquor is a feasible pretreatment to improve the enzymatic saccharification of corn stover for bioethanol production.
绿液由碳酸钠和硫化钠组成，在任何硫酸盐浆厂都很容易获得。用于生物乙醇生产的绿液预处理工艺是为木屑开发的。该工艺仅使用目前在硫酸盐浆厂中使用的经过验证的技术和设备，与基于酸的预处理方法相比，具有几个额外的优点，如高糖回收率和浓度，不产生抑制物质。该绿液用于预处理玉米秸秆，以提高生物乙醇生产中的酶水解效率。在优化条件下（总可滴定碱 8%、硫化度 40%和 140°C），可实现 70%的纸浆得率和 45%的木质素去除率。随后的酶水解中，使用 20 FPU/g-浆的酶，约 70%的原始多糖转化为可发酵糖。结果表明，绿液是一种可行的预处理方法，可以提高玉米秸秆的酶糖化效率，从而生产生物乙醇。
