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Extraction and separation method of alkane/olefin

A separation method, olefin technology, applied in extraction purification/separation, organic chemistry, etc., to achieve the effect of simple method

Inactive Publication Date: 2013-08-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention aims to solve the existing problems, and provides a method for extracting and separating alkanes / alkenes, especially a process for extracting and separating high-carbon alpha-olefins from homocarbon alkanes

Method used

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  • Extraction and separation method of alkane/olefin
  • Extraction and separation method of alkane/olefin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The mixture to be separated is a mixture of 1-hexene / n-hexane in different proportions, 1-hexene and n-hexane can be in any proportion, and the extractant is N-formylmorpholine (NFM);

[0022] First, according to different ratios (0.25, 0.5, 1.0), add a certain volume of extractant NFM to the mixture of 1-hexene and n-hexane, put the mixture containing the three substances into a volumetric flask, and then adjust the capacity The bottle was shaken in a constant temperature water bath shaker at 25°C for 2h, and then stood still for 1h.

[0023] Change the temperature of the oscillator and repeat the above experiment.

[0024] See Table 1 for the extraction results represented by the extraction selectivity S of the extractant NFM for 1-hexene at different temperatures (25°C, 30°C, 35°C).

[0025] Extraction selectivity of extractant NFM to 1-hexene under table 1 different temperatures

[0026]

[0027] w 1-己烯 % is the molar percentage of 1-hexene in the mixture to b...

Embodiment 2

[0030] The feed liquid is a mixed liquid of 1-hexene / n-hexane in different proportions, and the ratio relationship is that the molar content of 1-hexene in the mixed liquid is between 0-1;

[0031] The extractant is γ-butyrolactone (γ-BL);

[0032] First, according to different ratios (0.5, 1.0, 2.0), add a certain volume of extractant γ-BL to the mixture of 1-hexene and n-hexane, put the mixture containing the three substances into a small volumetric flask, Then place the volumetric flask in a constant temperature water bath shaker for 2h, and then let it stand for 1h. Change the temperature of the oscillator and repeat the above experiment. The extraction results represented by the extraction selectivity S of the extractant γ-BL to 1-hexene at different temperatures (25°C, 30°C, 35°C) are shown in Table 2.

[0033] Table 2 Extraction selectivity of 1-hexene by extractant γ-BL at different temperatures

[0034]

[0035] It can be seen from Table 2 that at 25°C, 30°C, an...

Embodiment 3

[0037] (1) Carry out fractionation with raw material light oil distillate oil, cut to obtain C 6 + distillate;

[0038] (2) The C obtained in the previous step 6 + The fraction was further fractionated to give C 6 distillate;

[0039] (3) The C obtained in the previous step 6 Carry out extractive distillation, and use a polar solvent as the extractant 1 to remove the organic oxygen-containing compounds contained therein; the extractant 1 used can be N-methylpyrrolidone (NMP), acetonitrile (ACN) or dimethyl Any one of formamide (DMF);

[0040] (4) The C obtained in the previous step 6 The fraction was subjected to liquid-liquid extraction, and the C 6 Alkanes and C 6 Separation of olefins; the extractant used is NMP, N-formylmorpholine (NFM), 1-methylimidazole (1-MI) or γ-butyrolactone (γ-BL); the extractant and the mixture to be separated The total volume ratio (compared to for short) = 0.25, 0.5, 1.0 or 2.0.

[0041] C obtained after two cuts 6 The distillate sect...

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Abstract

The invention discloses an extraction and separation method of alkane / olefin and belongs to the technical field of separation of olefin. The extraction and separation method of alkane / olefin comprises the following steps of: sufficiently contacting and mixing a to-be-separated mixture containing carbon-isotope normal alkane and high-carbon alpha-olefin with an extracting agent; standing, layering and separating, wherein the high-carbon alpha-olefin enters an extracting phase, the carbon-isotope alkane enters the extracting phase for separating. The extracting agent is N-methylpyrrolidone (NMP), N-formyl morpholine (NFM), 1-methylimidazole(1-MI) or gamma-butyrolactone(gamma-BL); and the total volume ratio of the extracting agent to the to-be-separated mixture is 0.25, 0.5, 1.0 or 2.0. The extraction and separation method of the alkane / olefin is simple and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of separation of olefins, in particular to separating α-olefins from a mixture containing saturated alkanes using a specific technology, more specifically separating 1-hexene from a mixture containing n-hexane. Background technique [0002] High carbon α-olefins such as 1-hexene and 1-octene are important and commonly used organic petrochemical raw materials, which can be used as detergents, oil additives, surfactants and pharmaceutical intermediates. They can also be used as high-quality comonomers to produce high-grade polyolefin resins. Compared with the polyethylene resin obtained by the traditional 1-butene copolymerization, high-density polyethylene (HDPE) and low-density polyethylene (LLDPE) copolymerized by 1-hexene have better impact strength, tear resistance, tensile strength Both strength and stability have advantages that the former cannot surpass. Substituting 1-butene and propylene for high-ca...

Claims

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Application Information

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IPC IPC(8): C07C11/107C07C9/15C07C7/10
Inventor 朱吉钦李芳芳黄巍刘新斌郭翔雷志刚
Owner BEIJING UNIV OF CHEM TECH
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