دانلود رایگان مقاله لاتین اتانول سلولزی از کاه برنج از سایت الزویر
عنوان فارسی مقاله:
تولید اتانول سلولزی از کاه برنج پیش درمانی حلال سبز
عنوان انگلیسی مقاله:
Cellulosic ethanol production from green solvent-pretreated rice straw
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Recently, new types of ‘green solvents’ were identified and recognized as potential solvents for a wide range of biological and non-biological applications (Paiva et al., 2014; Dai et al., 2013). These solvents were termed as natural deep eutectic solvents (NADES) and are made up of low-cost, naturally available chemical compounds with high melting points. Compared to the conventional organic solvents these solvents have boosted advantages in diverse areas of applications. Besides having physico-chemical properties similar to chemically synthesized Ionic liquids (ILs), NADES or termed as green solvents are entirely composed of lowcost natural components, primarily plant-based metabolites, which are biodegradable, non-toxic and eco-friendly (Paiva et al., 2014). These solvents are low-melting and low-transition temperature solvents that are convenient for process of biomass pretreatment at or near to ambient temperatures. Furthermore, green solvents are biocompatible solvents with infinite possibility to form wide-liquid ranges and specific substrate solubility properties. The most common recently developed green reagents comprises of binary solvents where choline chloride (CC) is mixed in different molar ratios with several other hydrogen bond donors, such as malonic acid, citric acid, and glycerol (Dai et al., 2013). In addition, preparation of green reagents is a simple process, and these catalysts could be easily recovered and recycled, thus may significantly reduce the overall-cost of the process. Utilizing such green solvents for biomass pretreatment is one of the key areas which need to be addressed in developing an economically viable cost-effective method for production of liquid biofuels. Global dependence on the rapidly depleting finite petroleum reserves in the fast growing industrialization era and the population growth has forced us to explore alternative renewable resources for sustaining life on earth. Lignocellulosic biomass is the most abundant renewable reserve and promising bioresource enriched in cellulosic and hemicellulosic fractions, which can be ef- ficiently hydrolyzed and routed towards production of liquid fuels. However, these biomass materials are highly recalcitrant to microbial or enzymatic breakdown due to intercellular heterogenic complex matrix formation with lignin moieties (Van Dyk and Pletschke, 2012). Thus biomass pretreatment became an essential step in order to overcome the recalcitrance towards high yield bioconversion to fermentable sugars. Among numerouspretreatment methods using physical, chemical and biological treatments, dilute acid, ammonia fiber expansion, ammonia recycled percolation and mild-alkali pretreatment treatments appeared suitable for commercial scale applications (Kumar et al., 2009; Wyman et al., 2013; Karimi et al., 2013). These methods are effective to breakdown lignocellulosic materials, but suffer high cost of capital expenditure (CAPEX) and operational expenditure (OPEX) (Gonzalez et al., 2011). In addition, the recyclability and reuse of the catalysts are a cost-intensive process and not sustainable. Recently, deep eutectic solvents (DES) have been reported as attractive reagents in strengthening enzyme stability and enhancing enzyme activity of lipase and laccases (Huang et al., 2013; Choi et al., 2011). The NADES pretreatment does not require extensive amounts of water for pre-washing the pretreated biomass residues, and reduces deleterious effects of acid or alkali on cellulase activity during sugars production. Thus employing NADES pretreatment, the overall production costs could be significantly decreased compared to the dilute acid or mild-alkali pretreatment methods. Rice straw was selected in the current investigation due to its abundance availability in surplus amounts, especially in the Asian countries. Foreseeing the potential use of this renewable biomass and its bioconversion into liquid fuels, voluminous research studies were reported from several decades, employing a wide range of pretreatment methods. However, majority of the pretreatment methods suffers with certain drawbacks viz., poor enzymatic saccharification, environmentally hazardous, non-biodegradable, non-renewable, multi step down-stream processing, solvent recovery, recycling, and high capital and operational expenditures. Here, we have prepared few green reagents including NADES reagents and low transition temperature mixtures (LTTMs) and studied their effect on commercially available cellulase Cellic Ctec2 and a β-glucosidase producing yeast strain Clavispora NRRL Y-50464. Besides these, we have also evaluated the cellulosic ethanol production from selective green-reagent pretreated rice straw.
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کلمات کلیدی:
Cellulosic Ethanol | DuPont Advanced Biofuels | DuPont USA www.dupont.com › ... › Industrial Biotechnology › Advanced Biofuels As demand increases for reduced dependence on fossil fuels, DuPont is leading development of more efficient, sustainable cellulosic ethanol production. Alternative Fuels Data Center: Ethanol Production https://www.afdc.energy.gov › AFDC › Fuels & Vehicles › Ethanol May 18, 2017 - Ethanol is a domestically produced alternative fuel most commonly made from corn. It can also be made from cellulosic feedstocks, such as ... A Cellulosic Ethanol Milestone - Forbes www.forbes.com/sites/rrapier/2016/04/26/a-cellulosic-ethanol-milestone/ Apr 26, 2016 - Have we entered the long-promised age of commercial cellulosic ethanol production? Not quite, but progress is being made. [PDF]Value Chain Structures that Define European Cellulosic Ethanol ... www.mdpi.com/2071-1050/9/1/118/pdf by JS Gregg - 2017 Jan 14, 2017 - Cellulosic Ethanol Production. Jay Sterling Gregg 1,*, Simon Bolwig 1, Teis Hansen 2,3, Ola Solér 1, Sara Ben Amer-Allam 1,. Júlia Pladevall ... People also ask What is cellulosic ethanol used for? Can yeast break down cellulose? What is cellulosic biomass? What is cellulosic material? Feedback Overview of cellulosic ethanol production | Learn Science at Scitable www.nature.com/scitable/content/overview-of-cellulosic-ethanol-production-14464225 Flow chart showing the steps in the production of cellulosic ethanol from feedstock crops. Biofuels: Producing Ethanol from Cellulosic Material | Protocol - JoVE https://www.jove.com/science.../biofuels-producing-ethanol-from-cellulosic-material Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University. In this experiment, cellulosic material (such as corn stalks, leaves, grasses, ... Images for Cellulosic ethanol production Image result for Cellulosic ethanol production Image result for Cellulosic ethanol production Image result for Cellulosic ethanol production Image result for Cellulosic ethanol production Image result for Cellulosic ethanol production More images for Cellulosic ethanol production Report images Searches related to Cellulosic ethanol production cellulosic ethanol plants cellulosic ethanol pros and cons cellulosic ethanol vs corn ethanol cellulosic ethanol production process flow diagram cellulosic ethanol production 2015 cellulosic ethanol advantages cellulosic ethanol production 2016 cellulosic definition
