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Method and device for refining 2,2-methoxy propane

A technology of methoxypropane and dimethoxypropane, which is applied in the refining field of 2,2-methoxypropane and can solve the problem of high energy consumption

Active Publication Date: 2017-11-24
TIANJIN TIANDA TIANJIU TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process involves two steps of azeotropic distillation, and a large amount of acetone is added in the third step, resulting in high energy consumption

Method used

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  • Method and device for refining 2,2-methoxy propane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] like figure 1 As shown, a refining device for 2,2-methoxypropane comprises an azeotrope tower 1, an extractive distillation tower 2, a product tower 3 and a methanol tower 4, and a reboiler 5 is provided at the lower end of each tower;

[0035] A raw material liquid inlet is arranged in the middle of the azeotrope tower 1, and the material outlet at the top of the azeotrope tower 1 is connected to the first condenser 6, the first reflux tank 7 and the upper end feed port of the azeotrope tower 1 in turn; the material outlet at the bottom of the azeotrope tower 1 Connected to the middle feed port of the extractive distillation column 2;

[0036] The discharge port at the top of the extractive distillation tower 2 is connected to the second condenser 8, the stratified tank 9 and the upper end feed port of the extractive distillation tower 2 in turn; the bottom discharge port of the stratified tank 9 is connected with the product tower 3; the product tower 3. The discharg...

Embodiment 2

[0045] This example is basically the same as Example 1, except that in the method of refining 2,2-dimethoxypropane: the operating reflux ratio of the azeotropic column is 7:1, the top temperature is 55°C, and the bottom temperature The operating reflux ratio of the extractive distillation column is 2:1, the tower top temperature is 65°C, and the tower bottom temperature is 79°C; the operating reflux ratio of the product tower is 3:1, and the tower top temperature is 70°C. The bottom temperature is 81°C; the operating reflux ratio of the methanol column is 1.5:1, the tower top temperature is 63°C, and the tower bottom temperature is 102°C.

[0046] The operating pressures of the azeotropic column 1, the extractive distillation column 2, the product column 3 and the methanol column 4 are all normal pressures.

[0047] In this example, 2,2-dimethoxypropane with a mass fraction of 99.9% was extracted from the bottom of the product tower 3, and the yield was 98.6%.

Embodiment 3

[0049] This example is basically the same as Example 1, except that in the method of refining 2,2-dimethoxypropane: the operating reflux ratio of the azeotropic column is 14.5:1, the tower top temperature is 56°C, and the tower bottom temperature The operating reflux ratio of the extractive distillation tower is 3.7:1, the tower top temperature is 66°C, and the tower bottom temperature is 81°C; the operating reflux ratio of the product tower is 4:1, and the tower top temperature is 71°C. The bottom temperature is 83°C; the operating reflux ratio of the methanol column is 2.4:1, the tower top temperature is 65°C, and the tower bottom temperature is 101°C.

[0050] The operating pressures of the azeotropic column 1, the extractive distillation column 2, the product column 3 and the methanol column 4 are all normal pressures.

[0051] In this example, 2,2-dimethoxypropane with a mass fraction of 99.86% was extracted from the bottom of product tower 3, and the yield was 99.1%.

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Abstract

The invention provides a method and device for refining 2,2-methoxy propane. The method includes the steps of S1, primarily separating a feed solution containing 2,2-dimethoxy propane, methyl alcohol, acetone and water via a azeotrope tower, and allowing part of azeotrope of acetone and methyl alcohol which are extracted from the top of the tower to the azeotrope tower; S2, leading materials extracted from the bottom of the azeotrope tower to an extractive rectification tower for rectification, leading the materials extracted from the top of the extractive rectification tower to a stratified tank, and leading the material extracted from the bottom of the extractive rectification tower to a methanol tower; S3, leading part of water from the bottom of the methanol tower to the stratified tank to serve as an extraction agent for recycling use, leading water phase in the stratified tank into the extractive rectification tower as backflow, and leading oil phase into a product tower; S4, obtaining the 2,2-dimethoxy propane from the bottom of the product tower. The method is low in energy consumption, and 2,2-dimethoxy propane products with mass fraction of more than 99.5% can be obtained.

Description

technical field [0001] The invention belongs to the field of chemical separation, and in particular relates to a method and device for refining 2,2-methoxypropane. Background technique [0002] 2,2-Dimethoxypropane is the simplest and most active ketal. There are two methoxy groups connected to one carbon atom of this compound. The large steric hindrance leads to strong chemical activity and is very easy to Hydrolysis, due to its high reactivity, has been widely used in fine chemical industries such as medicine and pesticides, so the research on its synthesis and application has special significance. The traditional 2,2-dimethoxypropane synthesis method uses acetone and methanol as raw materials. Although the raw materials are easy to obtain and the production process is simple, the yield is very low, and product separation and purification are difficult. The product mainly contains four components: methanol, acetone, water, and 2,2-methoxypropane, including four pairs of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C41/58C07C43/303B01D3/40B01D3/36B01D3/14
CPCB01D3/146B01D3/36B01D3/40C07C41/58C07C43/303Y02P20/10
Inventor 贾鹏飞唐恒丹赵海峰刘宝菊王吉红王丰
Owner TIANJIN TIANDA TIANJIU TECH CO LTD
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