Method for extracting p-xylene in n-octane by using [Bmim][FeCl4]

A technology for p-xylene and n-octane, which is applied in the field of liquid-liquid extraction, can solve the problems of many steps in the synthesis method, unstable experimental results, and many uncontrollable factors, and achieves high product yield, good biodegradability, and viscosity. low effect

Inactive Publication Date: 2016-06-22
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In the above synthesis method, toxic chemical substances such as toluene, cyclohexane, ethyl acetate, acetone, CH 2 Cl 2 etc., will cause harm to the body of the experimenter; in addition, the synthesis method has many steps, the synthesis is co

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  • Method for extracting p-xylene in n-octane by using [Bmim][FeCl4]
  • Method for extracting p-xylene in n-octane by using [Bmim][FeCl4]
  • Method for extracting p-xylene in n-octane by using [Bmim][FeCl4]

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Embodiment

[0045] 1-Butyl-3-methylimidazolium tetrachloride ionic liquid ([BMIM][ FeCl 4 ]), the synthesis and purification steps are relatively simple; the intermediate product [BMIM]Cl and the ionic liquid [BMIM][FeCl 4 ] structure, and calculate the purity of [BMIM]Cl (water not calculated) is above 98%, adopt KariFishcher method to measure [BMIM][FeCl 4 ] The water content is less than 50ppm, which meets the requirements for the determination of basic thermodynamic physical properties.

[0046] The specific method is as follows:

[0047] (1) Ionic liquid [BMIM][FeCl 4 ] Preparation:

[0048] B1: Weigh a certain amount of N-methylimidazole and place it in a jacketed reactor;

[0049] B2: Slowly add a certain amount of chlorobutane dropwise to B1, fully stir and mix, wash, and rotary evaporate to obtain [Bmim]Cl;

[0050] B3: According to the molar ratio [Bmim]Cl: anhydrous FeCl 3 For a 1:1 ratio, the anhydrous FeCl 3 Add to [Bmim]Cl in batches, fully stir and mix, rotary steam...

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Abstract

The invention relates to a method for extracting a p-xylene mixture in n-octane by using an ionic liquid [Bmim][FeCl4]. The method comprises the following steps: (1) preparation of [Bmim][FeCl4]; (2) separation of n-octane and p-xylene mixture: S1. preparing a mixed solution of n-octane and p-xylene in different mole ratios in a balance kettle; and S2. adding the ionic liquid which is equal to the total mass sum of the n-octane and p-xylene, stirring at uniform speed, and standing at a certain constant temperature for stratification. The quantitative analysis on the stratified liquid phases by gas chromatography detects that the ionic liquid has the advantages of favorable absorption effect on p-xylene, high selectivity and obvious separating effect. The method is simple and easy to implement, has the advantage of wide raw material application range, can be performed at normal temperature, and lowers the energy consumption.

Description

technical field [0001] The invention relates to the field of liquid-liquid extraction, in particular to a method utilizing ionic liquid [Bmim][FeCl 4 ] Extraction method for separation of mixtures of n-octane and p-xylene. Background technique [0002] Paraxylene (PX) is a very important chemical raw material, and there is a great demand for it in my country. It is mainly obtained from mixed xylenes catalyzed from naphtha through adsorption separation and crystallization separation. The separation of aromatic and aliphatic hydrocarbons, especially n-octane and p-xylene, is of great significance in the petrochemical industry. However, n-octane and p-xylene have very similar boiling points and tend to form azeotropes, so it is difficult to separate them. The most common separation method is extractive distillation. Extraction and rectification using traditional solvents such as sulfolane, glycerol, dimethylformamide, N-formylmorpholine, etc. There are some problems in term...

Claims

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Application Information

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IPC IPC(8): C07C7/10C07C9/15C07C15/08
CPCC07C7/10C07C9/15C07C15/08
Inventor 商云龙唐辉吴星
Owner BEIJING UNIV OF CHEM TECH
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