Method for separating mixture of diisobutylene and tertiary butanol

A technology of diisobutene and tert-butanol, applied in chemical instruments and methods, preparation of organic compounds, distillation purification/separation, etc., can solve problems such as azeotropic separation, which is not seen, and achieve the effect of simple operation and good separation effect.

Inactive Publication Date: 2013-08-14
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The azeotrope of diisobutene and methanol has not been reported in the literature, nor has there been any relevant report on the use of methanol for the azeotropic separation of diisobutene and tert-butanol mixtures

Method used

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  • Method for separating mixture of diisobutylene and tertiary butanol
  • Method for separating mixture of diisobutylene and tertiary butanol
  • Method for separating mixture of diisobutylene and tertiary butanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The quality of raw material liquid is 1500kg, the mass fractions of diisobutene and tert-butanol are 44.8% and 55.2% respectively, wherein TMP-1:TMP-2=76:24, add methanol 594.3kg therein, carry out intermittently under operating pressure 101.3kPa Rectification, reflux ratio 5. The temperature at the top of the tower is 59.0°C, the mass fractions of diisobutene and methanol at the top of the tower are 53.1% and 46.9%, respectively, and the mass is 1265.4kg. The mass fraction of tert-butanol in the tower kettle is 99.9%, and the mass is 828.8kg.

[0038] 379.6 kg of extractant water was added to the overhead distillate, and intermittent extraction was adopted. The extraction residence time was 0.5 h. The mass fraction of diisobutene in the extracted oil phase was 99.8%, and the mass of the oil phase was 673.3 kg. The water phase methanol solution is 971.7kg, and the methanol solution is rectified at atmospheric pressure with a reflux ratio of 4, and methanol with a mass ...

Embodiment 2

[0040] The mass fractions of diisobutylene and tert-butanol in the feed liquid are 30.0% and 70.0% respectively, wherein TMP-1:TMP-2=80:20 is continuously fed to the rectification tower at a mass flow rate of 1500.0kg / h; Flow rate 429.7kg / h continuously feeds methanol into the rectification tower. The operating pressure is 202.6kPa, and the reflux ratio is 8. The temperature at the top of the tower was 77.1°C. The mass fractions of diisobutene and methanol obtained at the top of the tower are 51.2% and 48.8%, respectively, and the distillation rate is 879.2kg / h; the mass fraction of tert-butanol in the tower bottom is 99.6%, and the recovery rate is 1050.5kg / h.

[0041] Add extractant water with the flow rate of 1758.4kg / h, in the extraction tower, continuously contact with the overhead distillate from the rectification tower to extract, the residence time is 0.1h, and obtain the oil phase with the flow rate of 452.3kg / h, wherein two The mass fraction of isobutene was 99.5%,...

Embodiment 3

[0043] Diisobutylene and tert-butanol mass fractions are respectively 25% and 75% in the raw material liquid, wherein TMP-1:TMP-2=50:50, feed continuously in the rectification tower with mass flow rate 1500.0kg / h; Simultaneously Methanol is continuously fed into the rectification tower at a mass flow rate of 328.8kg / h. The operating pressure is 60kPa, and the reflux ratio is 2. The azeotropic temperature at the top of the tower is 45.8°C, the mass fractions of diisobutene and methanol obtained at the top of the tower are 46.7% and 53.3%, respectively, and the distillation rate is 703.8kg / h. The mass fraction of tert-butanol in the tower kettle is 99.5%, and the recovery rate is 1125kg / h.

[0044] Add extractant water at a flow rate of 1055.7kg / h, and continuously contact with the overhead distillate from the rectification tower in the extraction tower for extraction. The residence time is 5h, and the oil phase is obtained at a flow rate of 376.9kg / h, wherein diisobutene The ...

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Abstract

The invention belongs to the field of chemical industry and discloses a method for separating a mixture of diisobutylene and tertiary butanol. Azeotropic distillation and liquid-liquid extraction separation are combined for separating the diisobutylene and the tertiary butanol. Methyl alcohol is chosen as an entrainer for azeotropic distillation, water is taken as an extraction agent for extraction, and methyl alcohol is extracted from azeotrope of the diisobutylene and the tertiary butanol. The method is simple to operate and has a good separation effect.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a method for separating a mixture of diisobutene and tert-butanol, in particular to a combined process of azeotropic rectification and liquid-liquid extraction to separate a mixture of diisobutene and tert-butanol to obtain diisobutene and tert-butanol butanol method. Background technique [0002] Diisobutene is generally a kind of 2,4,4-trimethyl-pentene-1 (abbreviated as TMP-1) and 2,4,4-trimethyl-pentene-2 ​​(abbreviated as TMP-2). A mixture of isomers. Because diisobutylene contains unsaturated double bonds, it has strong reactivity, and can undergo self-polymerization or copolymerization reactions, addition reactions or halogenation reactions, alkylation reactions, carbonylation reactions, etc., to generate a series of fine chemical intermediates , such as isononyl alcohol, tert-octylphenol, tert-octylamine, etc., are widely used in plastic additives, rubber additives, lubric...

Claims

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Application Information

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IPC IPC(8): C07C7/06C07C7/10C07C11/02C07C29/82C07C31/12
Inventor 乔旭汤吉海陈伟民吴明昆齐敏陈献崔咪芬费兆阳
Owner NANJING UNIV OF TECH
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