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

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Problems solved by technology

The existing adsorbent regeneration technology has problems such as complicated operation, low regeneration efficiency, and the adso

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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Example Embodiment

[0019] [Example 1]

[0020] The fresh adsorbent used in the present invention is recorded as Fresh, and the solid adsorbent is Zn 2+ Ion-exchange modified Y-type molecular sieve is used to adsorb and remove oxygenated compounds from mixed C4 hydrocarbons. In the experiment, dimethyl ether in the C4 hydrocarbon stream was used as the probe molecule to be removed from oxygen-containing compound impurities. Based on the total weight of the C4 hydrocarbon stream provided, the content of dimethyl ether is 150 ppmw. The adsorption evaluation conditions are: 2.0MPa, 35℃, 2h -1 The volumetric space velocity of the liquid, the filling amount of the adsorbent is 2ml, and the appearance of the adsorbent is cylindrical particles with a particle diameter of 10-20 mesh. After 72 hours of the adsorption experiment, the adsorbent is deactivated and needs to be regenerated. The deactivated adsorbent is recorded as S-1.

[0021] The adsorbent needs to undergo regeneration treatment before it conta...

Example Embodiment

[0023] [Example 2]

[0024] The fresh adsorbent used in the present invention is recorded as Fresh, and the solid adsorbent is Zn 2+ Ion-exchange modified Y-type molecular sieve is used to adsorb and remove oxygenated compounds from mixed C4 hydrocarbons. In the experiment, dimethyl ether in the C4 hydrocarbon stream was used as the probe molecule to be removed from oxygen-containing compound impurities. Based on the total weight of the C4 hydrocarbon stream provided, the content of dimethyl ether is 150 ppmw. The adsorption evaluation conditions are: 2.0MPa, 35℃, 2h -1 The volumetric space velocity of the liquid, the filling amount of the adsorbent is 2ml, and the appearance of the adsorbent is cylindrical particles with a particle diameter of 10-20 mesh. After 72 hours of the adsorption experiment, the adsorbent is deactivated and needs to be regenerated. The deactivated adsorbent is recorded as S-2.

[0025] The adsorbent needs to undergo regeneration treatment before it conta...

Example Embodiment

[0027] [Example 3]

[0028] The fresh adsorbent used in the present invention is recorded as Fresh, and the solid adsorbent is Zn 2+ Ion-exchange modified Y-type molecular sieve is used to adsorb and remove oxygenated compounds from mixed C4 hydrocarbons. In the experiment, dimethyl ether in the C4 hydrocarbon stream was used as the probe molecule to be removed from oxygen-containing compound impurities. Based on the total weight of the C4 hydrocarbon stream provided, the content of dimethyl ether is 150 ppmw. The adsorption evaluation conditions are: 2.0MPa, 35℃, 2h -1 The volumetric space velocity of the liquid, the filling amount of the adsorbent is 2ml, and the appearance of the adsorbent is cylindrical particles with a particle diameter of 10-20 mesh. After 72 hours of the adsorption experiment, the adsorbent is deactivated and needs to be regenerated. The deactivated adsorbent is recorded as S-3.

[0029] The adsorbent needs to undergo regeneration treatment before it conta...

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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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