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Method for separating methyl tert-butyl ether and methanol azeotrope by heat-integrated pressure swing rectification

A technology of methyl tertiary butyl ether and pressure swing rectification, which is applied in separation methods, distillation separation, ether separation/purification and other directions to achieve the effects of reducing equipment costs, improving purity and product yield, and reducing energy consumption

Active Publication Date: 2018-10-30
沾化大荣化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In view of the characteristics of the current traditional pressure swing rectification process and the problem that the methyl tert-butyl ether-methanol system exhibits different azeotropic behaviors with pressure changes, the purpose of the present invention is to provide the device for separating methyl tert-butyl ether-methanol azeotropic boiling system method

Method used

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  • Method for separating methyl tert-butyl ether and methanol azeotrope by heat-integrated pressure swing rectification
  • Method for separating methyl tert-butyl ether and methanol azeotrope by heat-integrated pressure swing rectification
  • Method for separating methyl tert-butyl ether and methanol azeotrope by heat-integrated pressure swing rectification

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Embodiment 1

[0045] The feed temperature is 25° C., the flow rate is 1000 kg / h, the pressure is 5.5 atm (absolute pressure), and the feed contains 60% of methyl tert-butyl ether and 40% of methanol. The operating pressure of the pressurized tower (HT) is 4 atm (absolute pressure), the number of theoretical plates is 29, the feed plate of the fresh stream is 22, the feed plate of the recycle stream is 20, the temperature at the top of the tower is 95.2°C, and the temperature at the bottom of the tower is 106.7°C; The operating pressure of the atmospheric column (LT) is 1 atm (absolute pressure), the number of theoretical plates is 14, the feed plate is 10, the temperature at the top of the tower is 51.1°C, and the temperature at the bottom of the tower is 65.9°C; after separation, methyl tert-butyl ether is obtained The product mass fraction is 99.75%, the yield is 99.81%, the methanol purity is 99.92%, and the yield is 99.90%.

[0046] In order to compare the energy consumption advantages ...

Embodiment 2

[0050] The feed temperature is 25° C., the flow rate is 980 kg / h, the pressure is 5.5 atm (absolute pressure), and the feed contains 65% of methyl tert-butyl ether and 35% of methanol. The operating pressure of the pressurized tower (HT) is 5 atm (absolute pressure), the number of theoretical plates is 24, the feed plate of the fresh stream is 17, the feed plate of the recycle stream is 15, the temperature at the top of the tower is 103.4°C, and the temperature at the bottom of the tower is 110.2°C; The operating pressure of the atmospheric column (LT) is 1 atm (absolute pressure), the number of theoretical plates is 14, the feed plate is 8, the temperature at the top of the tower is 51.4°C, and the temperature at the bottom of the tower is 66.2°C; after separation, methyl tert-butyl ether is obtained The product mass fraction is 99.98%, the yield is 99.90%, the methanol purity is 99.75%, and the yield is 99.75%.

[0051] In order to compare the energy consumption advantages o...

Embodiment 3

[0055] The feed temperature is 25° C., the flow rate is 780 kg / h, and the pressure is 6.5 atm (absolute pressure). The feed contains 70% of methyl tert-butyl ether and 30% of methanol. The operating pressure of the pressurized tower (HT) is 6 atm (absolute pressure), the number of theoretical plates is 30, the feed plate of the fresh stream is 23, the feed plate of the recycle stream is 18, the temperature at the top of the tower is 113.9°C, and the temperature at the bottom of the tower is 119.5°C; The operating pressure of the atmospheric column (LT) is 1 atm (absolute pressure), the number of theoretical plates is 12, the feed plate is 9, the temperature at the top of the tower is 51.4°C, and the temperature at the bottom of the tower is 66.4°C; after separation, methyl tert-butyl ether is obtained The product mass fraction is 99.98%, the yield is 99.99%, the methanol purity is 99.97%, and the yield is 99.92%.

[0056] In order to compare the energy consumption advantages o...

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Abstract

The invention relates to a method for separating methyl tertiary butyl ether and methanol azeotrope through heat integration pressure-change distillation. A device for implementing the method mainly comprises a pressurizing tower HT, an atmospheric-pressure tower LT, a reboiler H1, a reflux tank D1, a reflux tank D2, a condenser H2, a heat exchanger H3, a valve V1, a valve V2, a pressurizing pump P1, a pressurizing pump P2 and a pressurizing pump P3. The method solves the problem of difficulty in separation of general distillation of an azeotropic system, adopts complete heat integration pressure-change distillation and has the advantages of low energy consumption, high product purity and high 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 completely heat-integrated pressure-swing rectification to separate the azeotropic system of methyl tert-butyl ether and methanol. Large, that is, a binary azeotropic system of methyl tert-butyl ether and methanol with strong pressure sensitivity. 【Background technique】 [0002] MTBE is a colorless, transparent, high-octane liquid. It is an ideal blending component for the production of unleaded, high-octane, and oxygenated gasoline. As a gasoline additive, it has been used worldwide commonly used. It can not only effectively increase the octane number of gasoline, but also improve the performance of automobiles, reduce the CO content in exhaust gas, and reduce the production cost of gasoline at the same time. It was called "the third generation of petrochemicals" in the 1980s. Methanol is a colorless and volatile liq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C41/42C07C43/04C07C29/80C07C31/04B01D3/14
CPCB01D3/146C07C29/80C07C41/42C07C43/046C07C31/04
Inventor 朱兆友贾慧马康李敏王英龙
Owner 沾化大荣化工科技有限公司