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Method for reacting poisoned sorbent

An adsorbent and adsorbent bed technology, which is applied in the field of regeneration of poisoned adsorbents, can solve problems such as the decline of adsorbent activity and the inactivation of poisons, and achieve the effect of increasing the solubility and restoring the adsorption and separation function.

Inactive Publication Date: 2010-02-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple and easy, and the device does not need to be shut down. It has a significant effect on increasing the yield of PX, but it is limited to the decrease in the activity of the adsorbent caused by trace poisons, and cannot regenerate the adsorbent deactivated by a large amount of poisons. The poisoning of the adsorbent caused by it is difficult to regenerate with the general method of burning charcoal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] Determine the adsorption activity of fresh adsorbent and poisoned adsorbent.

[0028] Take 500 ml of fresh PX adsorbent A and place it in a narrow-necked bottle. The adsorbent A contains 90% by mass of BaX and the rest is kaolin. Add 800 ml of mixed xylene containing 100 ml of ethylene glycol, and soak at room temperature for 4 hours under shaking to make the ethylene glycol reach the adsorption saturation state on the adsorbent. The solvent is removed by filtration, and the surface liquid of the adsorbent is blown dry in a nitrogen stream to obtain PX adsorbent B poisoned by ethylene glycol.

[0029] Take 50 ml of adsorbents A and B, and measure the adsorption capacity according to the described method. The results are shown in Table 1. The relative activity in Table 1 is the percentage of the adsorption capacity of the adsorbent relative to the adsorption capacity of the fresh agent.

example 2

[0031] The method of the invention is used to regenerate the para-xylene adsorbent poisoned by ethylene glycol.

[0032] Take 70 ml of adsorbent B poisoned by ethylene glycol and load it into the adsorbent regeneration device. The device is composed of feed system, adsorption column, electric heating furnace and pressure control valve. The adsorption column is a φ33×4×200mm stainless steel tube, which is heated in a vertical electric furnace with automatic temperature control. The upper inlet of the adsorption column is connected with the feed system, and the lower outlet is connected with the pressure control valve and then connected with the effluent collector.

[0033] First at 60℃, at 2.0 -1 Inject pure benzene into the adsorbent bed to exhaust the gas at a volumetric space velocity, then increase the system pressure to 0.4MPa and the temperature to 80°C. Adjust the benzene feed rate to 63 ml / h, and at the same time to 7 ml / h Inject deionized water into the benzene at a high ...

example 3

[0035] Regenerate the poisoned adsorbent B according to the method of Example 2. The difference is that the regeneration temperature is 30°C, the benzene feed rate is 95 ml / hour, the amount of deionized water injected into benzene is 5 ml / hour, and the regeneration time is 72 hours. Stop the water injection after regeneration and continue at a volumetric airspeed of 2.0 -1 Into pure benzene, and gradually increase the temperature to 120°C, continue to pass benzene for 72 hours, reduce the system pressure to normal pressure, purge the adsorbent bed with 150°C benzene vapor for 24 hours, and dry at 200°C in a nitrogen stream for 24 hours hour. The adsorption capacity and relative activity of the obtained regenerated adsorbent D are shown in Table 1.

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PUM

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Abstract

A method for regeneration of toxic adsorbent is disclosed. The adsorbent comprises 80% to 95% by weight of molecular sieve and the other is adhesive agent. Regeneration process includes: solving and cleaning the adsorbent bed by using mixed aromatic solvent with 5% to 30% by volume of polar compound at 20 to 180 degree s C. under 0.2-1.5MPa and drying. Aromatic hydrocarbon in said mixed aromaticsolvent is selected from toluene, xylene, ethylbenzene, diethyl benzene or methyl ethylbenzene and polar compound is selected from water, methanol, ethanol or acetone.

Description

Technical field [0001] The present invention is a method for regenerating a poisoned adsorbent, specifically, a method for regeneration of an adsorbent that uses molecular sieve as an active component and is poisoned by polar organic compounds. Background technique [0002] Adsorption separation is a method of separating certain substances that are difficult to separate by conventional methods such as distillation, crystallization, extraction, etc., mainly isomers. The main principle of adsorption separation is to use high-efficiency molecular sieve as the active component of the adsorbent, and the separation of the extract from other components is achieved through the difference in the adsorption selectivity of the adsorbent to the mixture components. The adsorbent for adsorbing the extract is desorbed with a substance with a boiling point or melting point that is quite different from it, and then the desorbent is separated from the extract by rectification or crystallization. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/34B01J20/18
Inventor 王辉国郁灼马剑峰王德华赵毓璋
Owner CHINA PETROLEUM & CHEM CORP
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