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北京石油化工學(xué)院2026年研究生招生接收調(diào)劑公告

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cywillang

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[求助] 麻煩翻譯一下，本人英文水平不太好

Statistical optimization of dilute sulfuric acid pretreatment of corncob for xylose recovery and ethanol production
The interest on use of lignocellulose for producing fuels and chemicals is increasing as these materials are low cost, renewable and widespread sources of sugars. Corncob is an ttractive raw material for xylose and fuel ethanol production due to its high content of xylan and glucan. In this study, the central composite design of response surface method was used to optimize dilute H2SO4 pretreatment of corncob, in respect to acid concentration (0.16-1.84%), treatment time(0.16-1.84 h) and temperature (105-130 C) for xylose production. Enzymatic hydrolysis of the remaining solid was carried out further to evaluate the acid pretreatment conditions for maximizing glucose production. The results showed that pretreatment conditions for the highest xylose production was 1% sulfuric acid for
1.5 h at 123 C, corresponding to 87.2% total xylan converted to xylose and that for the highest glucose+cellobiose recovery was 0.5% sulfuric acid for 30 min at 125 C, corresponding to 78.1% total glucan converted to glucose þ cellobiose. In the subsequent simultaneous saccharification and fermentation (SSF) experiments using 14% glucan substrates pretreated under above two kinds of conditions, 47 g l1 ethanol with a 65.8% theoretical yield and 50.2 g l1 ethanol with a 70.4% theoretical yield were obtained,respectively.

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幸福寶貝1990

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【答案】應(yīng)助回帖

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愛與雨下: 金幣+1 2013-04-15 19:29:11
sltmac: 金幣+5, 翻譯EPI+1 2013-05-21 09:33:51

木糖恢復(fù)和乙醇生產(chǎn)的玉米芯稀硫酸預(yù)處理的統(tǒng)計(jì)優(yōu)化
利用木質(zhì)纖維素生產(chǎn)燃料和化學(xué)品正在增加，因?yàn)檫@些材料成本低，可再生能源和廣泛的糖源。玉米芯是作為生產(chǎn)木糖和燃料乙醇的原料，由于其有高的木聚糖和葡聚糖。在這次研究中，綜合設(shè)計(jì)了響應(yīng)面法，用來優(yōu)化稀H2SO4濃度（0.16-1.84％），治療時(shí)間（0.16-1.84小時(shí)）和溫度（105-130？C木糖生產(chǎn)）對于預(yù)處理玉米芯的影響。進(jìn)一步對剩余的固體進(jìn)行酶水解評估以達(dá)到最大化的葡萄糖生產(chǎn)的條件。結(jié)果表明，最高的木糖生產(chǎn)的預(yù)處理?xiàng)l件為1％的硫酸，1.5小時(shí)在123℃時(shí)，對應(yīng)于總效率87.2％木聚糖轉(zhuǎn)化為木糖；而且達(dá)到最高的葡萄糖的總木聚糖+纖維二糖的回收率。當(dāng)條件為0.5％的硫酸，30分鐘，在125℃時(shí)，對應(yīng)于78.1％的總轉(zhuǎn)化成葡萄糖t纖維二糖的葡聚糖。在隨后進(jìn)行的糖化和發(fā)酵（SSF）的實(shí)驗(yàn)中使用14％的葡聚糖底物預(yù)處理根據(jù)以上兩種條件下，47冰川1乙醇與理論產(chǎn)率的65.8％和50.2乙醇，分別得到具有70.4％的理論產(chǎn)率。

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