Composite solvent for purifying acetylene and purification method thereof

A composite solvent and acetylene technology, applied in chemical instruments and methods, hydrocarbons, organic chemistry, etc., can solve the problem of large solvent loss, achieve high selectivity, mild absorption and desorption operating conditions, and easy regeneration

Inactive Publication Date: 2012-10-03
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, NMP solvent purification of acetylene also has the following disadvantages: ① need to desorb higher alkynes (0.018-0.023MPa, 90-128℃) under vacuum and high temperature; ② need water washing tower and vacuum evaporator to recover entrained solvent; Easily hydrolyzed in the tower to generate N-methyl-aminobutyric acid corrosion equipment
The patent DE2121571 uses a mixed solution of NMP:methanol:diethanolamine at a ratio of 84:15:1 to treat acetylene mixed gas to obtain high-purity acetylene, ethylene and CO 2 The total amount of impurities is less than 0.001v%, but the boiling point of methanol in the mixed solution is low (64.8°C), and the loss of solvent is large

Method used

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  • Composite solvent for purifying acetylene and purification method thereof
  • Composite solvent for purifying acetylene and purification method thereof
  • Composite solvent for purifying acetylene and purification method thereof

Examples

Experimental program
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Effect test

example 1

[0017] The composition of the acetylene raw material gas is shown in Table 1. The physical solvent in the composite solvent is 25% NMP, 40% ethylene glycol, and 10% diethylene glycol. 2 The chemical auxiliary agent is 7% diethanolamine, 8% polyethylene glycol dimethyl ether, the polymerization inhibitor is 5% phenol, and the corrosion inhibitor is 5% diethylenetriamine. The operating parameters of each tower in the purification process are shown in Table 2. The composition of the refined acetylene product obtained after purification is shown in Table 3.

[0018] Table 2 Operating parameters of each column

[0019]

[0020] Table 3 Composition of refined acetylene products

[0021]

[0022] Acetylene product concentration is 99.54%, CO 2 The removal rate was 99.05%, and the removal rate of higher alkynes was 90.35%.

example 2

[0024] The composition of the acetylene raw material gas is shown in Table 1. The physical solvent in the composite solvent used is 45% DMF, 20% dimethyl sulfoxide, and 20% diethylene glycol. 2 The chemical additives are 5% monoethanolamine and 5% ethylenediamine, the polymerization inhibitor is 1% phenylenediamine and 2% tert-butylcatechol, and the corrosion inhibitor is 2% aniline. The operating parameters of each tower are shown in Table 4, and the composition of the refined acetylene product obtained after purification is shown in Table 5.

[0025] Table 4 Operating parameters of each column

[0026]

[0027] Table 5 Composition of refined acetylene products

[0028]

[0029] Acetylene product concentration is 99.63%, CO 2 The removal rate is 99.72%, and the removal rate of higher alkynes is 94.67%.

example 3

[0031] The composition of the acetylene raw material gas is shown in Table 1. The physical solvent in the composite solvent used is 50% dimethyl sulfoxide and 32% ethylene glycol. 2 The chemical auxiliary agent is 12% polyamine, the polymerization inhibitor is 3% benzoquinone, and the corrosion inhibitor is 3% picoline. The operating parameters of each tower are shown in Table 6, and the composition of the refined acetylene product obtained after purification is shown in Table 7.

[0032] Table 6 Operating parameters of each column

[0033]

[0034] Table 7 Composition of refined acetylene products

[0035]

[0036] Acetylene product concentration is 99.72%, CO 2 The removal rate is 100%, and the removal rate of higher alkynes is 92.38%.

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Abstract

The invention relates to a composite solvent used for purifying acetylene in acetylene mixed gas prepared from hydrocarbon and a purification method of the composite solvent. High-purity acetylene and higher alkyne, which are obtained from the acetylene feed gas, can be used as chemical materials. The invention adopts the technical scheme that the components of the composite solvent are as follows in mass percentage: 70-85 percent of physical solvent, 10-20 percent of CO2-removing chemical assistant, 1-5 percent of polymerization inhibitor in an addictive, and 0.5-5 percent of corrosion inhibitor. A device used in the purification method consists of an absorption tower, three desorbers and accessory equipment; the feed gas is firstly in countercurrent contact with the composite solvent in the absorption tower, wherein the acetylene, the higher alkyne and CO2 are absorbed by the composite solvent, then the high-concentration acetylene is absorbed out in the first desorber, the residual acetylene is absorbed out in the second desorber, and the higher alkyne and the CO2 are absorbed out in the third desorber. The composite solvent is high in selectivity, excellent in stability and easy to regenerate; and the purification method is simple in flow and mild in operation conditions, and the acetylene product whose purity is higher than 99.5 percent can be obtained.

Description

technical field [0001] The invention relates to a composite solvent used for acetylene purification for obtaining high-purity acetylene from acetylene mixed gas produced from hydrocarbons and a purification method thereof, belonging to the field of chemical gas purification. Background technique [0002] In the acetylene raw material gas produced by hydrocarbon cracking, the acetylene content is only 8-15v%, and the rest are impurities. Impurities consist of H 2 、CH 4 , CO, CO 2、 N 2 Such light components (commonly known as non-condensable gases) and propadiene, methyl acetylene, butadiene, vinyl acetylene, diacetylene, C 6 + Equivalent components (often called higher alkynes). Impurities must be removed to obtain acetylene with a purity >99.5v%, in order to meet the raw material requirements of organic synthesis products. [0003] Acetylene purification methods include adsorption method and solvent method. The adsorption method uses the different adsorption capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/24C07C7/11C07C7/20
Inventor 唐晓东李晶晶李小红汪芳卿大咏谯勤许玮玮肖坤良温晓红
Owner SOUTHWEST PETROLEUM UNIV
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