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Regeneration method for removing oxygen compound containing adsorbent in low-carbon olefins

A technology of low-carbon olefins and adsorbents, which is applied in the field of regeneration of adsorbents used to remove oxygenated compounds in low-carbon olefins, and can solve the problems of attenuation of adsorption performance of adsorbents, easy coking of adsorbents, and low regeneration efficiency , to achieve the possibility of reducing carbonization, good regeneration effect, and the effect of slowing down aggregation

Active Publication Date: 2018-03-09
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 regeneration 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 decay or even deactivate.

Method used

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  • Regeneration method for removing oxygen compound containing adsorbent in low-carbon olefins
  • Regeneration method for removing oxygen compound containing adsorbent in low-carbon olefins
  • Regeneration method for removing oxygen compound containing adsorbent in low-carbon olefins

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Experimental program
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Effect test

Embodiment 1

[0020] The fresh adsorbent used in the present invention is recorded as Fresh, and the solid adsorbent adopts 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. After the adsorption experiment was carried out for 72 hours, the adsorbent deactivated and needed to be regenerated, and the deactivated adsorbent was recorded as S-1.

[0021] After the adsorption experiment, the adsorbent needs to be regenerated be...

Embodiment 2

[0024] The fresh adsorbent used in the present invention is recorded as Fresh, and the solid adsorbent adopts 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. After the adsorption experiment was carried out for 72 hours, the adsorbent deactivated and needed to be regenerated, and the deactivated adsorbent was recorded as S-2.

[0025] After the adsorption experiment, the adsorbent needs to be regenerated be...

Embodiment 3

[0028] The fresh adsorbent used in the present invention is recorded as Fresh, and the solid adsorbent adopts 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. After the adsorption experiment was carried out for 72 hours, the adsorbent deactivated and needed to be regenerated, and the deactivated adsorbent was recorded as S-3.

[0029] After the adsorption experiment, the adsorbent needs to be regenerated be...

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Abstract

The invention relates to a regeneration method for removing an oxygen compound containing adsorbent in low-carbon olefins, and mainly solves the problems that the operation is complicated; the regeneration efficiency is low; the adsorbent can be easily coked and generate carbon deposition, so that the adsorption performance of the adsorbent is reduced or even inactivated, and the like. The regeneration method has the technical scheme that stepped programmed temperature rising is performed at lower pressure and a temperature higher than the adsorption temperature; the adsorbent requiring regeneration contacts positive or reverse flowing high-temperature drying gas with heat. The problems are well solved; the regeneration method can be used for removing the oxygen compound containing adsorbent in industrial low-carbon olefins.

Description

technical field [0001] The invention relates to a regeneration method for an adsorbent for removing oxygenated compounds in 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, dimeth...

Claims

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Application Information

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IPC IPC(8): B01J20/34C10G25/02C10G25/03C10G25/05
CPCB01J20/34B01J20/3408B01J20/3458C10G25/02C10G25/03C10G25/05C10G2300/202
Inventor 肖永厚洪涛刘苏
Owner CHINA PETROLEUM & CHEM CORP
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