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Oxygen-containing microporous activated carbon, preparation thereof and application of oxygen-containing microporous activated carbon in selective ethane adsorption

An activated carbon and selective technology, applied in the field of oxygen-containing microporous activated carbon and its preparation and application in selective adsorption of ethane, can solve the problems of low ethane/ethylene separation selectivity, complicated preparation process, and high production cost , to achieve good industrial application prospects, simple production process and low production cost

Pending Publication Date: 2021-11-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of low ethane / ethylene separation selectivity, high production cost and complicated preparation process existing in the existing ethane preferential adsorption materials, the present invention proposes to use biomass charcoal to prepare oxygen-containing microporous activated carbon, and develops and utilizes oxygen-containing microporous activated carbon. Method for preparing high-purity ethylene from porous activated carbon

Method used

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  • Oxygen-containing microporous activated carbon, preparation thereof and application of oxygen-containing microporous activated carbon in selective ethane adsorption
  • Oxygen-containing microporous activated carbon, preparation thereof and application of oxygen-containing microporous activated carbon in selective ethane adsorption
  • Oxygen-containing microporous activated carbon, preparation thereof and application of oxygen-containing microporous activated carbon in selective ethane adsorption

Examples

Experimental program
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Effect test

Embodiment 1

[0043] (1) Weigh 3g of coconut shell charcoal and 9g of KOH, grind, mix and dry. The dry carbon precursor is placed in a high-temperature tube furnace in a nitrogen atmosphere, and the temperature rises from room temperature to 800 °C at a rate of 10 °C / min. After activation for a period of time, it is cooled to room temperature, cleaned and dried to obtain oxygen-containing microporous activated carbon. The ethylene / ethane selectivity is 2.2, and the ethane adsorption capacity is 6.36mmol / g.

[0044] (2) Fill the oxygen-containing microporous activated carbon into the adsorption column. At 25°C and 1bar, the ethylene / ethane (15:1) mixture flows through the adsorption column at a flow rate of 5mL / min, and the end of the adsorption column obtains high-purity Ethylene gas (>99.99%), stop adsorption when the adsorption column is completely penetrated. At 100 °C, the adsorption column was purged with nitrogen to realize the regeneration of activated carbon.

[0045] (3) Fill the...

Embodiment 2

[0048] (1) Weigh 10 g of coconut shell and dry it, and activate it at 700° C. for 3 hours under nitrogen atmosphere to obtain about 8 g of coconut shell charcoal. Grind and mix the obtained coconut shell charcoal with 9g KOH, activate it under a nitrogen atmosphere at 900°C, wash and dry the product to neutrality, and dry it in vacuum to obtain an oxygen-containing microporous activated carbon material with an ethylene / ethane selectivity of 2.6 and an ethane adsorption capacity of 6.02 mmol / g.

[0049] (2) Fill the oxygen-containing microporous activated carbon into the adsorption column. At 20°C and 1 bar, the mixed gas of ethylene / ethane (1:10) flows through the adsorption column at a flow rate of 2mL / min, and the end of the adsorption column obtains high-purity Ethylene gas (>99.99%), stop adsorption when the adsorption column is completely penetrated. At 100 °C, the adsorption column was purged with nitrogen to realize the regeneration of activated carbon.

Embodiment 3

[0051] (1) Weigh 3g of coconut shell charcoal and 6g of KOH, grind, mix and dry. Place the dry carbon precursor in a high-temperature tube furnace in a nitrogen atmosphere, activate it at 800°C for 1 hour, cool to room temperature, wash and dry to obtain oxygen-containing microporous activated carbon, with an ethylene / ethane selectivity of 2.1 and an ethane adsorption capacity of 5.12 mmol / g.

[0052] (2) Fill the prepared oxygen-containing microporous activated carbon into the adsorption column, and at 15°C and 5bar, the mixed gas of ethylene / ethane (5:1) flows through the adsorption column at a flow rate of 15mL / min, and the end of the adsorption column obtains High-purity ethylene gas (>99.9%), when the adsorption column is completely penetrated, the adsorption will stop. At normal temperature, use a vacuum pump to desorb and regenerate, and the vacuum degree is 0.1 bar.

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Abstract

The invention discloses oxygen-containing microporous activated carbon, a preparation method thereof and application of the oxygen-containing microporous activated carbon in selective ethane adsorption. In the oxygen-containing microporous activated carbon, the sum of the volumes of pores with pore sizes distributed among the pores is 40-80% of the total pore volume. The preparation method comprises the following steps: grinding and mixing biomass charcoal and KOH in a mass ratio of 1: (1-10), performing vacuum drying, activating in an inert atmosphere at 300-1000 DEG C, and cleaning and drying an activated product to obtain the oxygen-containing microporous activated carbon, and contacting the oxygen-containing microporous activated carbon with an ethane-containing mixture to finish selective ethane adsorption.

Description

technical field [0001] The invention relates to the technical field of selective adsorption of ethane, in particular to an oxygen-containing microporous activated carbon and its preparation and application in selective adsorption of ethane. Background technique [0002] Ethylene (C 2 h 4 ) is an important chemical raw material, by 2020 the global C 2 h 4 Yields over 2×10 8 t. The ethylene produced by steam cracking contains a certain amount of ethane impurity. However, the molecular size of ethylene ethane is close to The physical properties are similar, and the separation of ethylene and ethane is difficult. At present, low-temperature rectification is the main way to obtain polymer-grade ethylene in industry, but the harsh operating conditions (0.7-2.8MPa, 183-256K) make the separation process consume a lot of energy and materials. According to statistics, the carbon emissions generated by the separation of ethylene / ethane account for nearly 0.8% of the global car...

Claims

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Application Information

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IPC IPC(8): B01D53/04B01D53/047B01J20/20B01J20/30C01B32/342C01B32/36C07C7/12C07C11/04
CPCB01D53/04B01D53/047B01D53/0462B01J20/20C01B32/342C01B32/36C07C7/12B01D2253/102C07C11/04
Inventor 邢华斌王中浩杨立峰崔希利陈丽媛
Owner ZHEJIANG UNIV
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