A kind of high-efficiency separation method of ethane in mixed gas

A separation method and mixed gas technology, which can be used 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 expanding the scope of application

Active Publication Date: 2022-07-08
TAIYUAN UNIV OF TECH
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  • Summary
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  • Description
  • Claims
  • Application Information

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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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  • A kind of high-efficiency separation method of ethane in mixed gas
  • A kind of high-efficiency separation method of ethane in mixed gas
  • A kind of high-efficiency separation method of ethane in mixed gas

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Effect test

preparation example Construction

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

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

[0037] 2) Add titanium source after stirring evenly, and continue stirring and reacting for a period of time;

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

[0039] In the synthesis process, selecting different titanium precursor metal salts and controlling their hydrolysis rate in the hydrothermal reaction process can better synthesize samples with high crystallinity, improve the yield of samples, and thus save costs. It is beneficial to the industrialized preparation of adsorbents. The titanium source in this embodiment can be selected...

Embodiment 1

[0049] Add 0.377 mg of 4,4',4"-nitrotribenzoic acid to 5.0 mL of DMF, and after stirring until completely dissolved, add 0.31 mL of isopropyl titanate and stir well to form a homogeneous orange solution. The mixed solution The solution was sealed in a 25mL high-pressure hydrothermal reactor, reacted at 180°C for 24h, washed with a DMF / methanol (1:1) mixed solution, and centrifuged to dry 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 h, and the adsorbent material from which the guest molecules were removed was obtained after vacuum drying.

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Abstract

The invention relates to a high-efficiency separation method for ethane in mixed gas. The mixed gas containing ethane is passed through a container filled with an ethane selective adsorbent at a certain temperature and pressure to complete the adsorption of ethane. Under inert gas purging or vacuuming to complete the desorption and regeneration of the adsorbent, the adsorbent is ZSTU-1 (Ti 6 (μ 3 ‑O) 6 (μ 2 ‑OH) 6 (TCA) 2 (H 2 O)(DMF) 2 ). The ethane separation method provided by the invention reduces the difficulty of separation and expands the applicable scope of the separation method. For low-concentration ethane gas in the ethane-ethylene mixed gas, high-purity ethylene product gas can be directly obtained through one-step separation; The adsorbent prepared by the method of the invention has strong adsorption force on ethane, high selectivity and good stability, is suitable for industrial production, and exhibits better separation effect than traditional methods for low-concentration ethane.

Description

technical field [0001] The invention relates to gas separation technology, in particular to an efficient separation method of ethane in mixed gas. Background technique [0002] Ethylene is an important petrochemical basic raw material, and its output is an important indicator to measure a country's petrochemical development level. In the traditional steam cracking, catalytic cracking and ethane dehydrogenation process of ethylene production, there are often 5-15% ethane impurities. different implementations of separation. However, in order to ensure the reduction of the ethane concentration in the mixed gas, the cryogenic process generally operates at high pressure and low temperature, and requires multi-stage trays to achieve high-efficiency separation. Therefore, while maintaining a high separation efficiency, the process has a significant problem of excessive energy consumption. It will be of great significance to efficiently separate and enrich low-concentration ethan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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