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Extractive distillation method for azeotropic mixture of tert-butyl alcohol and triethylamine

A technology of azeotropic mixture and extractive distillation, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve problems such as difficulty in guaranteeing product purity, high cost, and no relevant literature publications or reports, etc. Achieve the effects of improving product purity and extraction efficiency, diverse selectivity, and reducing production costs

Inactive Publication Date: 2016-04-27
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, azeotropic distillation has its own limitations: in terms of energy consumption, the cost is higher than other methods, and in terms of equipment investment, it is often larger than other methods, and the product purity is difficult to guarantee
[0009] At present, there is no relevant publication or report on the separation of tert-butanol-triethylamine azeotropic system

Method used

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  • Extractive distillation method for azeotropic mixture of tert-butyl alcohol and triethylamine
  • Extractive distillation method for azeotropic mixture of tert-butyl alcohol and triethylamine
  • Extractive distillation method for azeotropic mixture of tert-butyl alcohol and triethylamine

Examples

Experimental program
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Effect test

Embodiment 1

[0047] This implementation case is a continuous extraction and distillation operation mode, as attached image 3 As shown, ethylene glycol and N-ethylpyridine phosphate dimethyl salt ([epy][DMP]) were selected as the extractant, and the dosage was 500kg / h; %) and triethylamine (43wt%). The number of trays in T101 is 60, the feeding position of the extractant is on the 5th tray, and the feeding position of the raw material is on the 45th tray. The reflux ratio is set to 4:1, the extraction rate at the top of the tower is 57.1kg / h, and the purity of tert-butanol obtained is 99.9%. The number of T102 trays is 50, the feeding position of stream ⑤ is the 20th tray, the reflux ratio is 5:1, the extraction rate at the top of the tower is 42.9kg / h, and the purity of triethylamine obtained is 99.9%. The extractant is refluxed as a supplement to the solvent.

Embodiment 2

[0049] Extractant selects ethylene glycol, and consumption is 600kg / hr, and the reflux ratio of T101 is set as 3:1, and the reflux ratio of T102 is set as 6:1, and other conditions are as embodiment one, and the obtained tert-butanol and triethylamine The product purity is above 99.9%.

Embodiment 3

[0051] N-methylformamide was selected as the extractant, and other conditions were as in Example 1. The purity of the obtained tert-butanol and triethylamine products were both above 99.9%.

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Abstract

The invention provides an extractive distillation method for an azeotropic mixture of tert-butyl alcohol and triethylamine. According to the invention, the extractive distillation method for the azeotropic mixture of tert-butyl alcohol and triethylamine comprises a normal-pressure continuous operation mode or a normal-pressure intermittent operation mode; through selection of a variety of extractants, high-purity tert-butyl alcohol and triethylamine products are obtained; meanwhile, the extractants can be recycled. The maximal characteristic of the method provided by the invention is in that a traditional solvent and a mixed extractant constituted by the traditional solvent and an ionic liquid are selected for extraction, so the method has significant advantages in the aspects of energy consumption, environmental pressure and product purity, is especially applicable to large-scale industrial application, and specifically fills in the blank in separation of an azeotropic system of tert-butyl alcohol and triethylamine in the prior art.

Description

technical field [0001] The separation method provided by the present invention is aimed at the tert-butanol-triethylamine azeotropic system, using ethylene glycol, N-methylformamide, and a mixed solvent composed of ethylene glycol and ionic liquid as the extraction agent, belonging to the tertiary The extractive distillation method of butanol-triethylamine azeotropic system. Background technique [0002] The raw materials involved in the present invention are tert-butanol and triethylamine, both of which are common substances in the chemical industry. tert-butanol (C 4 h 10 O), also known as 2-methyl-2-propanol, often replaces n-butanol as a solvent for paint and medicine, an internal combustion engine fuel additive (to prevent carburetor from freezing) and an antiknock agent; in the field of synthesis, as an organic synthesis Intermediates and alkylation raw materials for the production of tert-butyl compounds, can produce methyl methacrylate, tert-butylphenol, tert-buty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/12C07C29/84C07C211/05C07C209/86
CPCC07C29/84C07C209/86C07C31/12C07C211/05Y02P20/54
Inventor 姜占坤刘顺江孙国新
Owner UNIV OF JINAN
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