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Study on the Separation of Glycol-Propanediol-Butanediol System Using Azeotropic Distillation

Author: SongGaoPeng
Tutor: SongHaiHua
School: Tianjin University
Course: Chemical Engineering
Keywords: Glycol 1,2 - propanediol 1,2 - butanediol Azeotropic distillation Homotopy algorithm
CLC: TQ202
Type: Master's thesis
Year: 2007
Downloads: 330
Quote: 1
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Abstract


Rising international oil prices , due to the gradual reduction of global oil resources , to solve the problem of oil shortage in recent years , many countries have proposed the corn \Corn instead of oil to do the low cost of the raw materials to produce chemical alcohol , and the use of renewable resources in the manufacture of chemical products , are increasingly attracted the attention of Governments . Corn fermentation liquor by dehydration , cleavage, and the initial separation the crude product of ethylene glycol -1 ,2 - propanediol, 1,2 - butanediol mixture , wherein butanediol has a higher economic value . This paper studies isolated from the reorganization of 1,2 - butanediol , has an important economic value and practical significance . Due to the small difference between the boiling point of the ternary system in the system , this article azeotropic distillation method separation predicted azeotropic composition and total boiling point with the same the Lun -Newton Joint algorithm , fuzzy mathematical method was applied to azeotropic distillation solvent choice solvent selection fuzzy comprehensive evaluation model to select cost-effective azeotropic distillation solvent separation , and finally through the experiment , butanediol purity industrial requirements , and can be used to guide the production . This article with Lun -Newton algorithm first homotopy method to meet the conditions of azeotropic differential equations into continuous homotopy function , and thus becomes an ordinary differential equation initial value problem . , Respectively, using the midpoint quadrature formula and Euler the forecast -Newton correction method to solve it , and this solution as the initial value of Newton's method , and then get the exact solution of the equation using Newton's method for ordinary differential initial value problem after conversion . By azeotropic distillation separating the ternary system , compared with ordinary rectification , improved relative volatility between Mixture , increases the yield of the product , and also improve the income of the entire apparatus .

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