Double-effect rectification method and system thereof for finely separating hybrid pentane isomer

A technology for isomers and fine separation, which is applied in the field of double-effect distillation energy-saving and water-saving systems, can solve the problems of high energy consumption and low product quality, achieve reasonable process design, remove key impurities, and improve product quality. quality effect

Active Publication Date: 2009-12-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Described n-pentane tower 3 tower tops extract normal pentane, the cut that is rich in cyclopentane taken out at the bottom sends into described cyclopentane tower 4, and described cyclopentane tower top extracts cyclopentane Alkanes, the

Method used

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  • Double-effect rectification method and system thereof for finely separating hybrid pentane isomer
  • Double-effect rectification method and system thereof for finely separating hybrid pentane isomer

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Embodiment 1

[0017] The annual processing capacity of C5 raw materials is 4×10 4 kg, 35% isopentane content (wt%, hereinafter the same), 50% n-pentane content, 5% cyclopentane content, 99% isopentane product is extracted from the isopentane tower, and the temperature after raw material preheating is 72 ℃, the pressure at the top of the light removal tower is 540Kpa, the temperature at the top of the tower is 54°C, the pressure at the top of the isopentane tower is 650Kpa, the temperature at the top of the tower is 95°C, the reflux ratio is 11, the pressure at the top of the n-pentane tower is 195Kpa, the temperature at the top of the tower is 57°C, The reflux ratio is 3.8, and the vaporization rate of the n-pentane bottom reboiler 8-3 is 0.25. The pressure at the top of the azeotrope tower is 175kpa, the temperature at the top of the tower is 66°C, the number of theoretical stages is 70, the reflux ratio is 100, and the mass ratio of new hexane and cyclohexane at the top of the tower is 1:...

Embodiment 2

[0020] The annual processing capacity of C5 raw materials is 4×10 4kg, isopentane content 35% (wt%, hereinafter the same), n-pentane content 50%, cyclopentane content 5%, isopentane tower output mass ratio 5: 5 n-isopentane mixed blowing agent product , the temperature of the raw material after preheating is 45°C, the pressure at the top of the dehydrogenation tower is 540Kpa, the temperature at the top of the tower is 54°C, the pressure at the top of the isopentane tower is 650Kpa, the temperature is 100°C, the reflux ratio is 1.7, the pressure at the top of the n-pentane tower is 195Kpa, The temperature at the top of the tower is 57° C., the reflux ratio is 4.5, and the vaporization rate of the n-pentane bottom reboiler is 0.25. The pressure at the top of the azeotrope tower is 180kpa, the temperature at the top of the tower is 63°C, the theoretical number of stages is 75, the reflux ratio is 95, and the mass ratio of new hexane and cyclohexane taken from the top of the towe...

Embodiment 3

[0023] The annual processing capacity of C5 raw materials is 4×10 4 Kilogram, isopentane content 35% (wt%, hereinafter the same), n-pentane content 50%, cyclopentane content 5%, isopentane tower takes out mass ratio 3: 7 n-isopentane mixed foaming agent products , the temperature of the raw material after preheating is 45°C, the pressure at the top of the dehydrogenation tower is 540Kpa, the temperature at the top of the tower is 54°C, the pressure at the top of the isopentane tower is 650Kpa, the temperature is 100°C, the reflux ratio is 1.7, the pressure at the top of the n-pentane tower is 195Kpa, The temperature at the top of the column is 57° C., the reflux ratio is 4.5, and the vaporization rate ratio of the n-pentane bottom reboiler 8-3 is 0.25. The pressure at the top of the azeotrope tower is 160kpa, the temperature at the top of the tower is 65°C, the theoretical number of stages is 80, the reflux ratio is 90, and the mass ratio of neo-hexane and cyclohexane at the t...

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Abstract

The invention discloses a double-effect rectification method for finely separating hybrid pentane isomer, which comprises the following steps: introducing a crude pentane raw material into a condensation preheater, a dehydrogenation tower of which the top is connected with a condenser and a reflux tank and the bottom is connected with a reboiler, an isopentane tower, an n-pentane tower, an azeotrope tower and a cyclopentane tower in turn to be rectified and separated, feeding total vapor at the tower top of the isopentane tower into the n-pentane tower and the reboiler as heat sources thereof, condensing the vapor into a two-phase mixture of vapor and liquid after heat exchange, then feeding the mixture to the azeotrope tower and the reboiler to exchange heat, re-preheating the crude pentane raw material by the waste heat after heat exchange, and finally beating the liquid to the isopentane tower as reflux liquid by a reflux pump of the isopentane tower. The method has the advantages of high product purity and low energy consumption and water consumption; and the product can be flexibly controlled according to the requirement.

Description

technical field [0001] The invention relates to the technical field of purification of chemical products, in particular to a double-effect rectification energy-saving and water-saving system and process for the fine separation of pentane isomers. Background technique [0002] Pentane is a very important chemical product, which can be used as a blowing agent for expandable polystyrene (EPS), expandable polyethylene (EPE) and a carrier solvent for linear low-density polyethylene catalysts. As pentane fuel, it is used in ceramics and other industries. From the perspective of consumption structure, it has the largest consumption in the field of blowing agents. The main raw materials for the production of pentane are light hydrocarbons in oilfields, top oil from crude oil pretreatment units, light naphtha from hydrogenation units, mixed hydrocarbons after reforming and hydrogenation, C 5 and C 5 fraction. At present, the overall supply of domestic pentane exceeds demand, but t...

Claims

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Application Information

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IPC IPC(8): C07C7/04C07C7/06C07C9/15C07C9/18C07C13/10
Inventor 孙津生高红王艳红张立宁田玉峰
Owner TIANJIN UNIV
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