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Pentane series production of high purity process development and optimization

Author: PanXuMing
Tutor: ZhangLvHong
School: Tianjin University
Course: Chemical Engineering
Keywords: Pure pentane Differential Thermocouple Energy
CLC: TQ203
Type: Master's thesis
Year: 2010
Downloads: 114
Quote: 0
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Abstract


Current use of light hydrocarbon feedstock to produce high purity pentane series most of the production processes, energy consumption and investment are larger, and the product purity is not high enough. Therefore, this article will be optimized through simulation and experimental analysis, to explore the fine craft production of high purity pentane and appropriate process parameters, reduce production costs. Right to a factory supplied 6t/hr light hydrocarbons as raw materials, production reached 99.00% purity isopentane and n-pentane five conventional tower simulation sequence, respectively. By comprehensive comparison, two for determining separation sequence preferably conventional column order, i.e. the first heavy off-C6, C4-then off the light components, the final separation of isopentane and n-pentane in the process. When the preferred product separation sequence output iC5/C5 Overhead were a mixture of 8:2 and 7:3 pentane, isopentane and outputs pure than when the system's total reboiler loads were reduced by 21.33% and 28.06%. Visible, direct output mixed pentane than pure reconcile advantage. Energy consumption is still preferred separation sequence for the larger issues, the use of differential thermal integration technology that enables off pagoda tower condenser and reboiler product integration. By comparing simulation shows that: When the product is pure and pure pentane isopentane when the differential pressure before and after heat integration total condensate separation system load and total load of the reboiler reduced 37.48% and 38.80%; when the product is iC5/C5 as 8:2 mixture of pentane and pure pentane, each reduced 22.12% and 23.43%; when the product is iC5/C5 7:3 mixture of pentane and pure pentane, each reduced 15.34% and 16.17% . Used for refining high-purity pentane series regular column order processes and thermally coupled distillation process parameters and energy efficiency were calculated and compared. The results showed that: in isopentane and n-pentane reached 96.00% purity and the yield of each of a certain premise, as compared with the conventional distillation sequences, using heat even eliminating the distillation column 13 theoretical plates, 2 a condenser and reboiler 2; 8.57% reboiling load. The main tower to tower liquid return flow deputy thermally coupled distillation system for energy consumption and product purity great impact. Can be obtained through simulation, vapor phase reflow V '= 23460kg/hr; liquid reflux L = 23450kg/hr. Product tower side cutting out of the way of the preferred separation sequence and differential thermal integrated process for appropriate improvements. Improved process with energy saving, easy to control, can simultaneously output pure pentane mixture of pentane and advantages. Through the factory collected field data and simulation comparison shows the calculated values, both in good agreement proves that the aforementioned selected thermodynamic equation, the calculation method used is reasonable; obtained results are correct. Differential thermal separation sequence of preferred integrated process separation plant raw materials to produce high purity pentane lightweight product than the original sequence separation process advantages.

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