Method for separating butane and butene by using multiple mixed solvent

A technology for mixing solvents and separating butane, which is applied in distillation purification/separation, bulk chemical production, organic chemistry, etc. It can solve problems such as low solubility, low tray efficiency, and low separation ability, and achieve increased relative volatility, The effect of reducing the solvent ratio and reducing energy consumption

Inactive Publication Date: 2009-04-29
YANTAI UNIV
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  • Application Information

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Problems solved by technology

The patent "Ionic liquid as a selective additive for separating near-boiling point or azeotropic mixtures" (ZL0286951.X) provides a method for separating near-boiling point or azeotropic mixtures by extraction and rectification using ionic liquids. The invention patent directly adopts The ionic liquid is a solvent separation close to the boiling point or an azeotropic mixture. The amount of the ionic liquid added is 5-90% of the liquid phase, but the method provided by the invention patent has a big problem when it is applied to the separation of carbon four, such as: extractive dis

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  • Method for separating butane and butene by using multiple mixed solvent
  • Method for separating butane and butene by using multiple mixed solvent

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[0025] The C4 mixture to be treated is C4 after etherification, that is, the mixed C4 after producing MTBE, the solvent ionic liquid used is 1-methyl-3-octyl-imidazole hexafluorophosphate, and the salt is potassium thiocyanate , the ratio of ionic liquid, methyl ethyl ketone and nitrogen-formylmorpholine mixture is 1 / 2 / 2 (mass ratio), and the salt content is 5% (mass).

[0026] The extractive distillation tower (1 tower) used is a packing tower: the material is stainless steel, the tower diameter is 50 mm, and the packing is stainless steel wire mesh packing; the stripping tower (2 towers) is also a packing tower: stainless steel, the tower diameter is 50 mm, and the packing is θ ring packing ;

[0027] Both towers are thermally insulated;

[0028] Mixed carbon four is added from the middle of tower 1 at a temperature of 50°C;

[0029] Solvent / carbon four feed ratio: 6~15;

[0030] Operating pressure at the top of tower 1: 0.50MPa(G);

[0031] 2 tower top operating pressur...

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Abstract

The invention relates to a method for spearing butane from butylene with the multicomponent compound of ionic liquid, saline, ethyl methyl ketone and N-formylmorpholine. The content of ionic liquid in the multicomponent compound is 1.0 to 95 percent; the content of the saline in the multicomponent compound is 0.5 to 20 percent; the electropositive ion of the ionic liquid is iminazole electropositive ion, alkyl imidazole electropositive ion or alkyl quaternary ammonium ion, or the compound thereof; the electronegative ion is tetrafluoroborate electronegative ion, hexafluorophosphoric acid electronegative ion, nitrate ion, tetrachloro aluminic acid iron, heptachlor bi aluminic acid iron, chloride ion, bromine electronegative ion or the mixture; and the ionic liquid can be dimethylformamide potassium thiocyanate compound salt, dimethylformamide sodium sulfocyanate compound salt, or the compound; the saline is potassium thiocyanate, sodium sulfocyanate, ammonium thiocyanate, sodium nitrate, potassium nitrate, sodium iodide, potassium iodide, zinc chloride, copper chloride, zinc chloride, potassium bromide, or the compound thereof.

Description

technical field [0001] The invention relates to a method for extracting and rectifying separation of butane and butene with a multi-component mixed solvent containing ionic liquid, salts, methyl ethyl ketone and N-formylmorpholine. Background technique [0002] The boiling points of butane and butene are close, and the relative volatility is close to 1. It is difficult to separate by ordinary rectification. Therefore, extractive distillation is often used for separation, that is, a polar component, that is, a solvent component, is added to the upper part of the rectification tower to make The relative volatility of butane and butene in the tower increases, improving the separation efficiency. There are many polar solvents that can be used for extraction and distillation to separate butane and butene, such as nitrogen-formyl morpholine, morpholine, mixture of nitrogen-formyl morpholine and morpholine, sulfolane, nitrogen-methylpyrrolidone, methyl ethyl ketone and A mixture o...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C9/06C07C7/08
CPCY02P20/54
Inventor 王文华陈小平冯咏梅许文友任万忠赵旗
Owner YANTAI UNIV
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