دانلود رایگان مقاله لاتین بازیابی بیوبوتانول از سایت الزویر
عنوان فارسی مقاله:
بازیابی بیوبوتانول از براث مدل راه حل / تخمیر با استفاده از تریپتاسیم فسفات
عنوان انگلیسی مقاله:
Biobutanol recovery from model solutions/fermentation broth using tripotassium phosphate
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
The research into the sustainable fuels becomes a hot field nowadays. On the one hand, the oil crisis gives impetus to the diversity of energy. On the other hand, the fossil fuels, such as coal and oil, have constituted significant sources of contamination of environments. Thus it is prudent to start a transition to cleaner fuels. Biofuels aim at cutting down the emission of carbon dioxide and other exhaust emissions into the atmosphere due to the source of biofuels, including sustainable biomass such as corn grain, corn stovers, and other feedstocks. 1-Butanol and ethanol, for example, are alternative fuels because they are renewable bio-based resources [1,2] 1-Butanol can be produced by the acetone + butanol + ethanol (ABE) fermentation [3]. After the fermentation, acetone, 1-butanol, and ethanol are recovered and purified by the multi-distillation method [4]. The separation process is unattractive because of the large energy consumption [5]. That’s why 1-butanol is mainly obtained via chemical synthesis. The large energy consumption is attributed to the dilute fermentation broth and the binary heterogeneous azeotropic 1-butanol + water system. At the end of the ABEfermentation, the broth contained ABE with different total solvents (ABE) levels. The total solvents levels of the fermentation broth varied from 18 g L−1 to 30.1 g L−1 because of the 1-butanol tolerance [6,7]. A prefractionator was always used to enrich the fermentation broth, and then the concentrated ABE solution was obtained in the top of the prefractionator [4]. But the water content of this solution was 50%–60%. So the binary heterogeneous azeotropic 1- butanol + water system formed in the downstream manipulations [8]. The aforementioned factors make the ABE fermentation inferior to chemical synthesis. Therefore, various in-situ techniques for the recovery of acetone, 1-butanol, and ethanol from the fermentation broth get rapid developments in solving these problems. The energy requirement for distillation was dependent of the ABE feed concentration [9]. By removing the solvents from the fermentation broth with other energy-saving methods, the energy requirement for the biobutanol separation fell sharply. These insitu recovery methods include adsorption [10], pervaporation [11], extraction [12], and gas stripping [13]. All the methods hold advantages and disadvantages, especially with regard to selectivity, regeneration, cost, and fouling. However, this concept of in-situ enrichment makes perfect sense to reduce the energy requirement. Acetone and 1-butanol from a dilute aqueous solution can be extracted by the extractants of cyclopentanol, n-ualeraldehyde, tert-amyl alcohol, and Adol B5NF [14]. Moreover, the extraction efficiency was significantly affected by the addition of a few strong electrolytes. The solvents (ABE) from the fermentation broth can
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