Method for reacting poisoned sorbent

A technology of adsorbent and adsorbent bed, which is applied in the field of regeneration of poisoned adsorbents, can solve the problems of inactivation of poisons and decreased activity of adsorbents, and achieve the effect of increasing dissolution capacity and restoring adsorption and separation functions

Inactive Publication Date: 2005-01-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present inventors have developed methods for removing harmful chemical agents from water without affecting their effectiveness or causing damage during treatment processes. By mixing certain types of molecules together with these drugs into one solution, they will stick well onto different surfaces while still being able to remove them efficiently. This results in better purification efficiency compared to existing technologies such as filtration techniques alone.

Problems solved by technology

Technologies described include processes like absorbing/adsorptively separating specific chemical species based upon their affinity towards another material. However, these techniques may result in decreased efficiency when removing unwanted contaminant(organisms). Additionally, there exist issues related to reducing catalyst deteriorations associated with decomposition reactions involving acid decompositions and metal cobalt precipitation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] The adsorption activity of the fresh adsorbent and the poisoned adsorbent was determined.

[0028] Take 500 milliliters of fresh PX adsorbent A and place it in a narrow-mouthed bottle. The adsorbent A contains 90% by mass of BaX, and the rest is kaolin. Add 800 milliliters of mixed xylenes containing 100 milliliters of ethylene glycol, shake and soak at room temperature for 4 hours, so that ethylene glycol reaches adsorption saturation on the adsorbent. The solvent was removed by filtration, and the liquid on the surface of the adsorbent was blown dry in a nitrogen flow to obtain the PX adsorbent B poisoned by ethylene glycol.

[0029] Take 50 milliliters of adsorbents A and B, and measure the adsorption capacity according to the method described, and 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 p-xylene adsorbent poisoned by ethylene glycol is regenerated by the method of the invention.

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

[0033] first at 60°C to 2.0 -1 The volume space velocity of pure benzene is injected into the adsorbent bed layer to exhaust the gas, then the system pressure is raised to 0.4MPa, the temperature is raised to 80°C, and the feed rate of benzene is adjusted to be 63 ml / hour, and at the same t...

example 3

[0035] The poisoned adsorbent B was regenerated as in Example 2. The difference is that the regeneration temperature is 30° C., the feed rate of benzene is 95 ml / hour, the amount of deionized water injected into benzene is 5 ml / hour, and the regeneration time is 72 hours. After regeneration, stop water injection and continue at a volumetric space velocity of 2.0 -1 The amount of pure benzene was passed through, and the temperature was gradually raised to 120°C, and the benzene was continuously passed for 72 hours, the system pressure was reduced to normal pressure, and the adsorbent bed was purged with 150°C benzene vapor for 24 hours, and dried at 200°C in nitrogen flow 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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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 aromatic solvent is selected from toluene, xylene, ethylbenzene, diethyl benzene or methyl ethylbenzene and polar compound is selected from water, methanol, ethanol or acetone.

Description

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Claims

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Application Information

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Owner CHINA PETROLEUM & CHEM CORP
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