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Study on Separation of Isopropanol-water Azeotrope Using the Coupling Process of Biomass-based Fixed-bed Adsorption and Distillation

Author: GongChunMei
Tutor: SunJinSheng
School: Tianjin University
Course: Chemical Engineering
Keywords: Biomass fixed bed adsorption - Distillation Starch adsorbent Inverse Gas Chromatography Process simulation
CLC: TQ223.123
Type: Master's thesis
Year: 2010
Downloads: 70
Quote: 0
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Abstract


Unavoidable in the process of industrial production of alcohols containing water, and most of the alcohol with water to form a binary azeotrope of the ordinary distillation methods can not separate the two. Currently widely used on industrial azeotropic distillation method, but there are still shortcomings of higher energy consumption. In this paper, the biomass fixed bed adsorption - distillation coupling process, to get close to the azeotropic concentration of isopropyl alcohol - water mixed steam using ordinary distillation; then after starch adsorbents ZSG-1 adsorption bed packed with breakthrough total boiling point; longer after a normal distillation tower kettle high concentrations of isopropyl alcohol products, in order to develop effective, feasible, low energy refining new processes isopropanol. Mature distillation process, the experimental part of the study the adsorption process, and the use of a software simulation of the overall process. First, using inverse gas chromatography ZSG-1 selective adsorption of water and isopropyl alcohol, and the characterization and calculation of its internal structure, pore size distribution and specific surface area. Using orthogonal experimental studies ZSG-1 of isopropanol - water mixed vapor adsorption behavior in a fixed bed. Mainly by the different bed height, bed temperature, the tower reactor bath temperature of the bed through the curve to determine the optimum adsorption conditions. Optimum adsorption conditions, select the appropriate adsorption rate data regression formula to establish adsorption module and software simulation method coupled with the normal distillation, to obtain an effective energy-saving new process to estimate its energy consumption with existing Total Rectification process for comparison. The experimental results show that: the retention time of water and the adsorption free energy change significantly greater than isopropanol, showed a great degree of separation, and therefore determining starch adsorbent ZSG-1 can be used as the adsorbent obtaining anhydrous isopropanol. Moreover, with the column temperature was gradually increased, the retention time of the water is reduced faster than isopropanol, show that a low temperature is more conducive starch adsorbent for the adsorption of water. Calculated to the heat of adsorption of water were Bad -55.73kJ/mol, thereby drawn starch adsorbent ZSG-1 belong to the physical adsorption of water adsorption. Optimal experimental conditions for fixed bed adsorption experiments selected by orthogonal experiment tower kettle thermostat water bath temperature of 89 ° C, the bed temperature of 88 ° C, bed height 26cm, various factors on the top of the tower distillate mass fraction of isopropanol in affect the extent of the size of the tower kettle thermostat water bath temperature gt; bed height gt; bed temperature. Select classes Graham formula to establish adsorption module as a mathematical model, using simulation software ProII simulation of biomass fixed bed adsorption - distillation coupling process, and to estimate its energy consumption is approximately 8.4MJ/kg isopropanol.

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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 > Propanol
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