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Activation method for adsorbent used for removing oxygen-containing compounds from low-carbon olefins

A technology of low-carbon olefins and activation methods, which is applied in the fields of adsorption purification/separation, chemical instruments and methods, separation methods, etc., can solve the problems of adsorption performance attenuation of adsorbents, easy coking and carbon deposition of adsorbents, and low regeneration efficiency. Slow down aggregation, good activation effect, avoid coking effect

Active Publication Date: 2018-03-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing adsorbent activation technology has problems such as complicated operation, low regeneration efficiency, and the adsorbent is prone to coking and carbon deposition, which causes the adsorption performance of the adsorbent to attenuate or even deactivate.

Method used

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  • Activation method for adsorbent used for removing oxygen-containing compounds from low-carbon olefins
  • Activation method for adsorbent used for removing oxygen-containing compounds from low-carbon olefins
  • Activation method for adsorbent used for removing oxygen-containing compounds from low-carbon olefins

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The solid adsorbent used in the present invention is to adopt Zn 2+ Ion-exchange modified Y-type molecular sieves for the adsorption and removal of oxygenates from mixed C4 hydrocarbons. In the experiment, dimethyl ether in a C4 hydrocarbon stream is used as a probe molecule to remove oxygen-containing impurities. The content of dimethyl ether was 150 ppmw based on the total weight of the supplied C4 hydrocarbon stream. The adsorption evaluation conditions are: at 2.0MPa, 35°C, 2h -1 The volumetric space velocity of the liquid is 2ml, and the loading capacity of the adsorbent is 2ml. The appearance of the adsorbent is a cylindrical particle with a particle diameter of 10-20 mesh.

[0019] Before the adsorbent is in contact with the C4 hydrocarbon material to be purified, it needs to be activated. The activation process and specific conditions are: the gas used for activation is CH with a water content lower than 10ppm 4 gas, first at room temperature 30°C under cons...

Embodiment 2

[0022] The solid adsorbent used in the present invention is to adopt Zn 2+ Ion-exchange modified Y-type molecular sieves for the adsorption and removal of oxygenates from mixed C4 hydrocarbons. In the experiment, dimethyl ether in a C4 hydrocarbon stream is used as a probe molecule to remove oxygen-containing impurities. The content of dimethyl ether was 150 ppmw based on the total weight of the supplied C4 hydrocarbon stream. The adsorption evaluation conditions are: at 2.0MPa, 35°C, 2h -1 The volumetric space velocity of the liquid is 2ml, and the loading capacity of the adsorbent is 2ml. The appearance of the adsorbent is a cylindrical particle with a particle diameter of 10-20 mesh.

[0023] Before the adsorbent is in contact with the C4 hydrocarbon material to be purified, it needs to be activated. The activation process and specific conditions are: the gas used for activation is N with a water content below 10ppm 2 Gas, first at room temperature 30°C, the gas volume ...

Embodiment 3

[0026] The solid adsorbent used in the present invention is to adopt Zn 2+Ion-exchange modified Y-type molecular sieves for the adsorption and removal of oxygenates from mixed C4 hydrocarbons. In the experiment, dimethyl ether in a C4 hydrocarbon stream is used as a probe molecule to remove oxygen-containing impurities. The content of dimethyl ether was 150 ppmw based on the total weight of the supplied C4 hydrocarbon stream. The adsorption evaluation conditions are: at 2.0MPa, 35°C, 2h -1 The volumetric space velocity of the liquid is 2ml, and the loading capacity of the adsorbent is 2ml. The appearance of the adsorbent is a cylindrical particle with a particle diameter of 10-20 mesh.

[0027] Before the adsorbent is in contact with the C4 hydrocarbon material to be purified, it needs to be activated. The activation process and specific conditions are: the gas used for activation is Ar gas with a water content of less than 10ppm. First, at room temperature 30°C, the gas vo...

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Abstract

The invention relates to an activation method for an adsorbent used for removing oxygen-containing compounds from low-carbon olefins. The activation method mainly overcomes the problems of complex operation, low activation efficiency, attenuation or even inactivation of adsorptivity of adsorbents due to proneness of adsorbents to coking and carbon formation, etc. in conventional activation methods. The activation method provided by the invention overcomes the above problems by adopting a technical scheme that gradient programmed heating is carried out at a low pressure and at a temperature higher than an adsorption temperature and an adsorbent to be activated contacts with high-temperature heat-carrying drying gas flowing forwardly or backwardly; and the activation method is applicable toindustrial adsorbents used for removing oxygen-containing compounds from low-carbon olefins.

Description

technical field [0001] The present invention relates to an activation process for adsorbents for the removal of oxygenates from light olefins. Background technique [0002] my country's C4 resources are very rich, mainly from hydrocarbon cracking and refinery catalytic cracking. Among the C4 hydrocarbons, isobutene has the highest content and has high use value. One of its main uses is to react with methanol to synthesize methyl tert-butyl ether (MTBE). At present, most of the mixed C4 is used to produce MTBE. The etherified C4 mainly contains 1-butene, and also contains unreacted methanol and dimethyl ether (DME) and other oxygen-containing impurities produced by side reactions. Such impurities are highly polar and are easily adsorbed to cause poisoning and deactivation of downstream production catalysts. In order to meet production needs, the purity requirements of C4 raw materials are constantly increasing, of which H 2 The removal of impurities such as O, methanol, di...

Claims

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Application Information

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IPC IPC(8): B01J20/34B01D53/04C07C7/12C07C11/02
CPCB01D53/04B01D2259/40086B01D2259/4009B01J20/3408B01J20/3483C07C7/12C07C11/02
Inventor 肖永厚洪涛刘苏
Owner CHINA PETROLEUM & CHEM CORP
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