Method for separating isobutyl alcohol and normal heptanes azeotropic system by using pressure swing distillation

A technology of pressure swing rectification and n-heptane, which is applied in the direction of distillation purification/separation, chemical instruments and methods, and preparation of organic compounds, etc., to achieve the effects of high heat utilization rate, low equipment investment cost, and low operating cost

Active Publication Date: 2015-10-28
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0013] In view of the characteristics of the current traditional pressure swing rectification process and the problem that the isobutanol and n-heptane syst

Method used

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  • Method for separating isobutyl alcohol and normal heptanes azeotropic system by using pressure swing distillation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The feed temperature is 25° C., the flow rate is 1000 kg / h, and the pressure is 1 atm (absolute pressure). The feed contains 80% isobutanol and 20% n-heptane. The theoretical plate number of the atmospheric column is 28, the inner diameter of the tower is 0.503m, the feed plate of the fresh stream is 11, and the feed plate of the circulating stream is 18; the theoretical plate number of the pressurized tower is 18, the inner diameter of the tower is 0.653m, and the feed plate is 15. The operating pressure of the atmospheric column is 1atm (absolute pressure), the reflux ratio is 1.2, the temperature at the top of the tower is 91.0°C, and the temperature at the bottom of the tower is 112.3°C; the operating pressure of the pressurized tower is 12atm (absolute pressure), the reflux ratio is 1.7, and the tower top The temperature is 212.6°C, and the bottom temperature is 232.8°C. The isobutanol product obtained after separation has a purity of 99.90% and a yield of 99.90%,...

Embodiment 2

[0049] The feed temperature is 25° C., the flow rate is 1000 kg / h, and the pressure is 1 atm (absolute pressure). The feed contains 80% isobutanol and 20% n-heptane. The theoretical plate number of the atmospheric column is 28, the inner diameter of the tower is 0.518m, the feed plate of the fresh stream is 13, and the feed plate of the circulating stream is 15; the theoretical plate number of the pressurized tower is 18, the inner diameter of the tower is 0.649m, and the feed plate is 13. The operating pressure of the atmospheric column is 1atm (absolute pressure), the reflux ratio is 1.4, the temperature at the top of the tower is 91.0°C, and the temperature at the bottom of the tower is 112.2°C; the operating pressure of the pressurized tower is 12atm (absolute pressure), and the reflux ratio is 1.5. The temperature was 212.7°C, and the bottom temperature was 232.8°C. The purity of the isobutanol product obtained after separation is 99.89%, and the yield is 99.89%, and the...

Embodiment 3

[0051] The feed temperature is 25° C., the flow rate is 1000 kg / h, and the pressure is 1 atm (absolute pressure). The feed contains 75% isobutanol and 25% n-heptane. The theoretical plate number of the atmospheric column is 28, the inner diameter of the tower is 0.561m, the feed plate of the fresh stream is 15, and the feed plate of the circulating stream is 17; the theoretical plate number of the pressurized tower is 18, the inner diameter of the tower is 0.758m, and the feed plate is 14. The operating pressure of the atmospheric column is 1atm (absolute pressure), the reflux ratio is 1.7, the temperature at the top of the tower is 91.0°C, and the temperature at the bottom of the tower is 112.2°C; the operating pressure of the pressurized tower is 13atm (absolute pressure), the reflux ratio is 2.2, and the tower top The temperature is 217.6°C, and the bottom temperature is 242.5°C. The purity of the isobutanol product obtained after separation is 99.80%, and the yield is 99....

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Abstract

The invention relates to a method for separating an isobutyl alcohol and normal heptanes azeotropic system by using pressure swing distillation and a device applicable to the method. The device mainly comprises an atmospheric tower T1, a pressurized tower T2, a condenser C1, a condenser C2, a reflux drum D1, a reflux drum D2, a reboiler R1 and a reboiler R2, wherein the reboiler R1 and the reboiler R2 are respectively connected at the bottoms of the atmospheric tower T1 and the pressurized tower T2, the condenser C1 and the reflux drum D1 are sequentially connected at the top of the atmospheric tower T1, the condenser C2 and the reflux drum D2 are sequentially connected at the top of the pressurized tower T2. The separation steps are as follows: a fresh material first enters into the atmospheric tower T1, an isobutyl alcohol product is extracted at the bottom of the tower, after being condensed through the condenser C1, and collected through the reflux drum D1, part of overhead vapor is back flowed, part of the extract enters into the pressurized tower T2 for a secondary rectification, a normal heptanes product is extracted at the top of the pressurized tower T2, and the material flow at the bottom of the tower cycles to the atmospheric tower T1. The method provided by the invention solves the difficult separation problem that the azeotropic behaviors of the system respectively show up a lowest feature and a highest feature along with the raising pressure, and has the advantages of low energy consumption and high product recovery rate.

Description

technical field [0001] The invention belongs to the field of separation and purification in the chemical industry, and specifically relates to a method for separating the azeotropic system of isobutanol and n-heptane by pressure swing rectification, and is especially suitable for separating the azeotropic behavior of isobutanol and n-heptane with the pressure increasing. Boiling binary azeotrope system of isobutanol and n-heptane. Background technique [0002] Isobutanol and n-heptane are important chemical raw materials, which are widely used in pharmaceutical, rubber, spray paint and other industries. Industrially, in the process of producing tris(2-methylpropyl) vanate, the effective separation of isobutanol and n-heptane has great economic benefits for enterprises. [0003] Because the isobutanol and n-heptane system can form an azeotrope under normal pressure, a special distillation method is required to separate the mixture of the two. Commonly used special distillat...

Claims

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Application Information

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IPC IPC(8): C07C31/12C07C29/80C07C9/15C07C7/04
CPCC07C7/04C07C29/80C07C31/12C07C9/15Y02P20/10
Inventor 王英龙张震刘薇卜光乐朱兆友
Owner QINGDAO UNIV OF SCI & TECH
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