Rare earth-Cu-Fe active carbon adsorbent, preparation method and application thereof

An activated carbon adsorption, -cu-fe technology, applied in separation methods, chemical instruments and methods, and other chemical processes, can solve problems such as low PH3 adsorption capacity, secondary pollution, and complicated processes, and achieve waste recycling , reduce purification cost, mild reaction conditions

Inactive Publication Date: 2010-04-14
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above methods all have defects such as low dephosphorization accuracy, high energy consumption, low efficiency, complicated process, large investment or secondary pollution, especially for pH 3 The adsorption capacity is not high
The yellow phosphorus tail gas puri

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Wash the coal-based activated carbon with distilled water, then ultrasonically clean it, then dry it in an oven, dry it at 100°C for 12-24 hours, and take it out for use; weigh 1.2202g Cu(NO 3 ) 2 ·3H 2 O, 0.1025g Fe(NO 3 ) 3 9H 2 O and 0.0116gLa(NO 3 ) 3 ·nH 2 O mixed, so that the Cu / Fe / La molar ratio is 20:1:0.25, the weight ratio of activated carbon to the impregnation solution is 1:1, dissolve with 24ml distilled water, and dissolve with 24ml distilled water to obtain the impregnation solution; Weigh 25g of activated carbon and immerse in the impregnating liquid, stir well, impregnate by ultrasonic at 30°C for 40min, dry in an oven at 100°C for 12-24h; finally place in a muffle furnace and bake at 350°C for 6-8h Take it out and place it in a desiccator and cool it to room temperature to obtain an activated carbon adsorbent for adsorbing low-concentration phosphine gas.

[0025] The adsorption conditions are: 4.17g adsorbent, PH at the inlet of the adsorption...

Embodiment 2

[0029] The preparation method and adsorption conditions of activated carbon adsorbent are as in Example 1, except that the Cu / Fe / La molar ratio is 20:1:0.4, and the weight ratio of activated carbon to impregnation solution is 1:1. The results show that the adsorbent to PH 3 The adsorption capacity is 44mg phosphine gas / g adsorbent.

[0030] Purification effect:

[0031] time / min

Embodiment 3

[0033] The preparation method and adsorption conditions of activated carbon adsorbent are as in Example 1, except that the Cu / Fe / La molar ratio is 20: 1: 0.8, and the weight ratio of activated carbon to impregnation solution is 1: 2. The results show that the adsorbent to PH 3 The adsorption capacity is 35mg phosphine gas / g adsorbent.

[0034] Purification effect:

[0035] time / min

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PUM

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Abstract

The invention relates to a method for preparing a rare earth-Cu-Fe active carbon adsorbent. The method is characterized by comprising the following steps: (1) washing coal active carbon with distilled water, and then washing with ultrasound; and thermostatically drying for 12-24 hours under the temperature condition of 80-120 DEG C; (2) dipping the coal active carbon of the step (1) into a mixed brine solution containing rare earth cerium or lanthanum and transition metal copper or iron, wherein the molar ratio of the rare earth to the copper to the iron is (0.25-0.8):20:1; mixing the active carbon and the brine solution according to the weight ratio of 1:1-1:2, carrying out ultrasound dipping for 40 minutes and then drying for 12-24 hours at a temperature of 80-100 DEG C; and (3) roasting the coal active carbon dried through the step (2) for 2-8 hours at a temperature of 200-600 DEG C so as to obtain the active carbon adsorbent for adsorbing low-concentration hydrogen phosphide gas. Compared with the prior art, the invention has the advantages of simple method and strong operability, improves the purifying efficiency and reduces the purifying cost. When the active carbon adsorbent is in saturated state, waste gas dephosphorization and waste reclamation can be realized. The method has moderate reaction condition and is easy to realize.

Description

technical field [0001] The invention relates to the technical field of adsorption and separation, in particular to a rare earth-Cu-Fe activated carbon adsorbent for purifying low-concentration phosphine, a preparation method and application thereof. Background technique [0002] Phosphine (PH 3 ) is a colorless, foul-smelling gas at room temperature. It is highly toxic and is also called phosphine or phosphine. pH 3 It is mainly produced in the process of yellow phosphorus production, magnesium powder preparation, acetylene production, sodium hypophosphite production, and grain storage fumigation and insecticide. Its emissions will cause air pollution, endanger the environment and human health, and affect the pH 3 The reuse of yellow phosphorus tail gas and calcium carbide furnace tail gas. The purification of yellow phosphorus tail gas to produce high-purity CO technology is the main topic of my country's "Tenth Five-Year Plan" chemical environmental protection research...

Claims

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Application Information

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IPC IPC(8): B01J20/32B01J20/20B01D53/04
Inventor 易红宏杨丽萍唐晓龙余琼粉杨丽娜
Owner KUNMING UNIV OF SCI & TECH
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