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Experiment Research on Anhydrous Ethanol Production Using New Globular Adsorbent

Author: XueJinYong
Tutor: MaXiaoJian
School: Zhengzhou University
Course: Chemical Process Equipment
Keywords: Anhydrous ethanol Spherical biomass adsorbent Fixed bed Adsorption properties Desorption
CLC: TQ223.122
Type: Master's thesis
Year: 2008
Downloads: 20
Quote: 0
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Abstract


With the excessive consumption of fossil fuels in today's world energy body and constantly enhance the awareness of environmental protection, oil research and find environmentally friendly energy alternatives become one of the world technology development direction. Fuel ethanol is one of the alternative fuel, compared to regular gasoline, more complete combustion and lower CO emissions and the combustion properties of gasoline similar. The primary task of the production of fuel ethanol production of anhydrous ethanol, about ordinary distillation systems can be obtained 95% (w / w) ethanol, ethanol production by about 95% (w / w) ethanol was originally adopted method is a constant boiling distillation, extractive distillation, salt extraction. The high energy consumption of these methods, the recent rise of the molecular sieve, membrane separation and biomass assay. Use the biomass adsorbent production of fuel ethanol is a new, low-cost method. Used in this experiment is the Zhengzhou University in the development of a new type of spherical biomass adsorbent. This experiment was mainly to the performance of the fixed bed adsorbent. Fixed bed consists of three sections Φ100 × 5, each section 1 meter stainless steel tube connected together. Respectively, made of two particle adsorbents at the desorption air temperature within the range of from 85 ° C to 95 ° C, the pressure in the column in the range of 0.01MPa ~ 0.08MPa, the mass flow rate of the raw material gas velocity the 78.44 g / min ~~ and 188.73g / min range of conditions out of bed layer breakthrough curves, the breakthrough curves to examine the adsorption properties of the adsorbent. The study found that the the the desorption air temperature and the adsorption column pressure influence on the adsorption: the low desorption Air temperatures favor adsorption but if desorption air flow while the desorption time will increase. Conducive to adsorption increased the pressure in a certain range have little impact on the the adsorption effect before the penetration point continues to rise, but can improve the penetration point adsorption performance. The raw gas velocity increases the mass transfer zone growth, the bed pressure drop increases, penetration time, can improve product quality and product output of the unit time; excessive gas velocity of raw materials will lead to decline in alcohol concentration of the resulting product, production decreased . A change in temperature of the bed in the adsorption process and the pressure drop changes. Adsorption process the temperature of the bed rising eventually stabilized; drop change showing randomness, and smaller, can be ignored. In this experiment, the desorption air temperature was 85 ℃, a pressure column is 0.035MPa, the mass flow of the raw material gas velocity for 78.44g/min under conditions, adsorption column packed with a small diameter adsorbent 1000mL average concentration of 99.79% ( w / w) in anhydrous alcohol. The adsorption process in a bed of pressure drop change is very small and can be ignored, large particle size of the bed pressure drop is less than the pressure drop of a small particle size. The adsorption process is an exothermic reaction, the temperature of each point increase over time increase the temperature of each point is substantially constant, when the adsorbent approaches saturation. The desorption studies focused on the desorption time: a fixed amount of heating steam, using different desorption air flow. Also studied the bed pressure drop in the desorption process. Desorption air can be increased in the high temperature and high flow rate the temperature gradient of the bed, the more water can be taken away per unit time, to accelerate the desorption rate; desorption time with the increase of the air flow in the case of heating a certain amount of steam, large first decrease after the increase. The amount of steam condensate is 70g/min desorption air flow of 56m ~ 3 / h, the the large particle desorption shortest time is 45min. Small particle size of the shortest desorption time 51min. Desorption air temperature by dehydration through the bed, the bed desorption process after the first drop l, and the lowest dropped to 60 ° C. When the first point the temperature rose to 70 ° C, that the desorption end. The desorption process water continuously from the adsorbent desorbed adsorbent volume is reduced, the share of the volume of the bed reduction, increasing the porosity of the bed, the bed pressure drop gradually lower, after water removal, the bed pressure drop no longer change. Bed unit with the desorption air volume changes the pressure drop in line with the the Eugen formula. The return of this thesis, the voltage drop formula.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic alcohols (alcohols, hydroxy compounds) and its derivatives > Aliphatic alcohol > Fatty Alcohols > Ethanol ( alcohol )
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