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Efficient separation method for ethane in mixed gas

A separation method and mixed gas technology, applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of weak ethane adsorption force and low selectivity, and achieve high ethane adsorption capacity and efficient separation. , the effect of strong adsorption force

Active Publication Date: 2021-09-28
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, ethane-selective MOF materials are mostly limited by weak ethane adsorption force and low selectivity, and the development of MOF materials with strong ethane adsorption is more conducive to their industrialization. Adsorption separation

Method used

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  • Efficient separation method for ethane in mixed gas
  • Efficient separation method for ethane in mixed gas
  • Efficient separation method for ethane in mixed gas

Examples

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preparation example Construction

[0035] The preparation method of described adsorbent comprises the following steps:

[0036] 1) Add 4,4',4"-nitrotribenzoic acid to nitrogen, nitrogen-dimethylformamide, and stir until completely dissolved;

[0037] 2) After stirring evenly, add the titanium source, and continue stirring for a period of time;

[0038] 3) After mixing evenly, the obtained mixed solution is sealed, subjected to high-temperature hydrothermal reaction, washed, and dried to obtain the chemical formula (Ti 6 (μ 3 -O) 6 (μ 2 -OH) 6 (TCA) 2 (H 2 O)(DMF) 2 ) as adsorbents on metal-organic frameworks (MOFs).

[0039] Selecting different titanium precursor metal salts during the synthesis process and controlling their hydrolysis rate in the hydrothermal reaction process can better synthesize samples with high crystallinity, increase the yield of samples, and save costs. It is beneficial to the industrial preparation of the adsorbent. The titanium source in this embodiment may be isopropyl titan...

Embodiment 1

[0049] Add 0.377 mg of 4,4',4"-nitrotribenzoic acid to 5.0 mL of DMF, stir until completely dissolved, add 0.31 mL of isopropyl titanate and stir well to form a uniform orange solution. The mixture The solution was sealed in a 25mL high-pressure hydrothermal reactor, reacted at 180°C for 24h, washed with a mixed solution of DMF / methanol (1:1), and dried by centrifugation to obtain the product.

Embodiment 2

[0051] Before testing the adsorption separation performance of the prepared samples, methanol was used for solvent exchange and washing. The prepared orange sample powder was subjected to Soxhlet extraction with methanol, the washing time was 12 hours, and the adsorbent material from which guest molecules were removed was obtained after vacuum drying.

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Abstract

The invention relates to an efficient separation method of ethane in mixed gas, which comprises the following steps: enabling the mixed gas containing ethane to pass through a container filled with an ethane selective adsorbent at a certain temperature and pressure to finish the adsorption of ethane, and conducting purging with inert gas or conducting vacuumizing at room temperature to finish the desorption regeneration of the adsorbent. The adsorbent is ZSTU-1 (Ti6([mu3-O)6([mu]2-OH)6(TCA)2(H2O)(DMF)2). According to the ethane separation method provided by the invention, the separation difficulty is reduced, the application range of the separation method is expanded, and high-purity ethylene product gas can be directly obtained through one-step separation for low-concentration ethane gas in the ethane-ethylene mixed gas. The adsorbent prepared by the method has the advantages of strong ethane adsorption action force, high selectivity and good stability, is suitable for industrial production, and shows a better separation effect on low-concentration ethane than that of a traditional method.

Description

technical field [0001] The invention relates to gas separation technology, in particular to a high-efficiency separation method for ethane in mixed gas. Background technique [0002] Ethylene is an important basic petrochemical raw material, and its output is an important symbol to measure the development level of a country's petrochemical industry. In traditional steam cracking, catalytic cracking, ethane dehydrogenation and other ethylene production processes, there are often about 5-15% of ethane impurities. In order to obtain polymer grade ethylene, it is often necessary to use the boiling point of the two components by low temperature rectification. The different implementations are separated. However, in order to ensure that the concentration of ethane in the mixed gas is reduced in this cryogenic process, the general operating conditions are high pressure and low temperature, and multi-stage trays are required to achieve efficient separation. Therefore, while mainta...

Claims

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Application Information

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IPC IPC(8): C07C7/12C07C9/06B01D53/04B01J20/22B01J20/30
CPCC07C7/12B01D53/04B01J20/226B01D2259/40086B01D2253/204C07C9/06Y02P20/50
Inventor 李立博刘普旭陈杨
Owner TAIYUAN UNIV OF TECH
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