Extractive distillation method of tert-butyl alcohol-propyl formate azeotropic mixture

Inactive Publication Date: 2016-06-15
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
[0008] At present, there are no relevant publications or reports on the separation of tert-butanol-propyl formate azeotropic system

Method used

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  • Extractive distillation method of tert-butyl alcohol-propyl formate azeotropic mixture
  • Extractive distillation method of tert-butyl alcohol-propyl formate azeotropic mixture
  • Extractive distillation method of tert-butyl alcohol-propyl formate azeotropic mixture

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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-ethylpyridinium phosphate dimethyl salt ([epy][DMP]) were selected as the extractant, and the dosage was 300kg / h; %) and propyl formate (60wt%). The number of T101 trays is 55, 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 at 5:1, the extraction rate at the top of the tower is 60kg / h, and the purity of the obtained propyl formate is 99.7%. The number of trays in T102 is 15, the feeding position of stream ⑤ is the seventh tray, the reflux ratio is 0.5:1, the extraction rate at the top of the tower is 40kg / h, and the purity of tert-butanol obtained is 99.6%. The extraction agent at the bottom of the column is refluxed as a supplement to the solvent.

Embodiment 2

[0049] The extraction agent is ethylene glycol, the dosage is 300kg / hr, the reflux ratio of T101 is set to 5.5:1, the reflux ratio of T102 is set to 0.6:1, other conditions are as in Example 1. The purity of the obtained tert-butanol and propyl formate products are both above 99.9%.

Embodiment 4

[0051] This implementation case is an operation mode of batch extraction and rectification, as attached Figure 4 As shown, ethylene glycol and N-methylpyridine phosphate dimethyl salt ([mpy][DMP]) were selected as the extractant, and the dosage was 500kg; the raw material processing capacity was 100kg, and the raw material composition was tert-butanol (40wt%) and formic acid Propyl ester (60wt%); the number of theoretical plates is 60, and the feeding position of the extractant is on the fifth plate. The mixture of tert-butanol and propyl formate is injected into the distillation column E1 by the raw material pump P2 at one time, and the heating is started; when the condensate appears at the top of the column, the total reflux operation is carried out, and the extractant is continuously added into the column through the pump P1, and Continue the total reflux operation; when the temperature at the top of the tower reaches 55°C, it is detected that the content of propyl formate...

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Abstract

The invention provides an extractive distillation method of a tert-butyl alcohol-propyl formate azeotropic mixture. The extractive distillation process of a tert-butyl alcohol-propyl formate azeotropic mixture comprises an operation mode with continuous pressure reduction or an operation mode with intermittent pressure reduction, a plurality of extractants are selected, so that the tert-butyl alcohol product with high purity and the propyl formate product with high purity are obtained, and the extractants can be recycled and utilized. The method is characterized in that except traditional solvents are used in distillation, a mixed extractant which is composed of traditional solvents and ionic liquid is employed; the method has the advantages in the aspects of energy consumption, environment stress, and product purity; the method is especially suitable for industrial application of large scale; the method especially aims at separation of the tert-butyl alcohol-propyl formate azeotropic system, and fills the technological blank in prior art.

Description

technical field [0001] The separation method provided by the present invention is aimed at the tert-butanol-propyl formate azeotropic system, respectively adopts ethylene glycol, a mixed solvent composed of ethylene glycol and ionic liquid as the extraction agent, and belongs to the tert-butanol-propyl formate azeotropic system. Extractive distillation method of boiling system. Background technique [0002] The raw materials involved in the present invention are tert-butanol and propyl formate, 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-...

Claims

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Application Information

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IPC IPC(8): C07C27/32C07C29/84C07C31/12C07C67/54C07C69/06
CPCC07C29/84C07C67/54C07C31/12C07C69/06Y02P20/54
Inventor 姜占坤刘顺江孙国新
Owner UNIV OF JINAN
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