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Device and method for separating diisopropyl ether-isopropanol mixture by using binary mixed extraction agent

A binary mixing and diisopropyl ether technology, applied in the preparation of organic compounds, extraction distillation, ether separation/purification, etc., can solve the problems of solubility and selectivity, unsatisfactory separation effect, etc.

Pending Publication Date: 2020-07-07
山东省特种设备检验研究院潍坊分院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The key technology of extractive distillation lies in the choice of extractant. A single extractant often has unsatisfactory separation effect. The binary mixed extractant solves the problem of the contradiction between the solubility and selectivity of a single solvent itself.

Method used

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  • Device and method for separating diisopropyl ether-isopropanol mixture by using binary mixed extraction agent

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Embodiment 1

[0013] Embodiment 1: as figure 1 The extractive distillation process shown. The extractive distillation column has 30 theoretical plates, the binary mixed extractant 1 dimethylacetamide (DMAC), ethylene glycol enters from the fifth theoretical plate in a ratio of 1:2, the flow rate is 10kg / h, and the raw material 2 Enter from the 18th theoretical board, its composition is 89.7% isopropyl ether, 10.3% isopropanol, and the flow rate is 10kg / h. The extractive distillation column operates under normal pressure, the reflux ratio is 2, the temperature at the top of the extractive distillation column is 68.6°C, and the temperature at the bottom of the column is 144°C. Diisopropyl ether 3 with a mass fraction of 98.6% can be obtained at the top of the column, and the bottom product The mixture 4 of isopropanol and binary mixed extractant dimethylacetamide (DMAC) and ethylene glycol enters the extractant recovery tower from the 17th theoretical plate. The extraction agent recovery to...

Embodiment 2

[0014] Embodiment 2: as figure 1 The extractive distillation process shown. The extractive distillation column has 30 theoretical plates, the binary mixed extractant 1 dimethylacetamide (DMAC), ethylene glycol enters from the fifth theoretical plate in a ratio of 1:2, the flow rate is 20kg / h, and the raw material 2 Enter from the 18th theoretical board, its composition is 89.7% isopropyl ether, 10.3% isopropanol, and the flow rate is 10kg / h. The extractive distillation tower is operated under normal pressure, the reflux ratio is 2, the temperature of the top of the extractive distillation tower is 69.2°C, the temperature of the bottom of the tower is 147°C, the top of the tower can obtain diisopropyl ether 3 with a mass fraction of 99.3%, and the bottom product The mixture 4 of isopropanol and binary mixed extractant dimethylacetamide (DMAC) and ethylene glycol enters the extractant recovery tower from the 17th theoretical plate. The extraction agent recovery tower operates ...

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Abstract

The invention relates to a device and a method for separating a diisopropyl ether-isopropanol mixture, in particular to a device and a method for separating a diisopropyl ether-isopropanol mixture byusing a binary mixed extraction agent. The device comprises a raw material storage tank, an extractive distillation tower, an extractant recovery tower, a centrifugal pump and an extractant circulating channel. The method comprises the following steps of under normal pressure, extracting diisopropyl ether from the top of an extractive distillation tower by using a binary mixed extractant composedof dimethylacetamide (DMAC) and ethylene glycol in a ratio of 1: 2, and extracting isopropanol and the binary mixed extractant from the bottom of the extractive distillation tower. The tower bottom fraction is used as a feeding material and enters an extractant recovery tower for rectification operation, isopropanol is extracted from the tower top, and a binary mixed extraction agent is extractedfrom the tower bottom for cyclic utilization. The method has the advantages that the relative volatility of the diisopropyl ether-isopropanol system is improved, the separation effect is good, the cyclic utilization of the extraction agent is realized, and the cost is reduced.

Description

technical field [0001] The invention relates to a device and method for separating diisopropyl ether-isopropanol mixture, in particular to a binary mixed extractant using dimethylacetamide (DMAC) and ethylene glycol to separate diisopropyl ether - Apparatus and method for isopropanol mixtures. Background technique [0002] Diisopropyl ether is an important organic chemical, which is widely used in the chemical industry and is a good solvent for animal, vegetable and mineral oils. Diisopropyl ether has a high octane number and antifreeze, and is often used in gasoline additives. At present, the production of diisopropyl ether includes isopropanol dehydration method, alcohol alkenes synthesis method and propylene water and method. All contain isopropanol in the product of these methods, and diisopropyl ether and isopropanol can form polar azeotrope under normal pressure, conventional separation method is difficult to obtain the higher diisopropyl ether of purity, needs to us...

Claims

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Application Information

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IPC IPC(8): C07C41/42C07C43/04C07C29/84C07C31/10B01D3/40
CPCC07C41/42C07C29/84B01D3/40C07C43/04C07C31/10
Inventor 王建华杨磊程俊卿
Owner 山东省特种设备检验研究院潍坊分院