Method for preparing transitional metal ion Co modified adsorbent for purifying low-concentration phosphine

A transition metal ion and phosphine technology, applied in phosphine, chemical instruments and methods, and other chemical processes, can solve problems such as complex process, increased operation, difficult control, and easy fluctuation of dephosphorization efficiency. The effect of high adsorption activity

Inactive Publication Date: 2009-10-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The oxidation-reduction absorption method uses the reducing property of phosphine to react with a solution containing an oxidizing agent (such as sodium hypochlorite, potassium permanganate, sulfuric acid, hydrogen peroxide, phosphoric acid, etc.) to realize the purification of phosphine. Consumption of oxidant, dephosphorization efficiency is closely related to oxidant concentration, while the concentration of oxidant drops rapidly during the absorption reaction, so there are disadvantages such as high operating cost, easy fluctuation of dephosphorization efficiency, and poor operability of the device
Chinese patent CN 85105317 (publication number) has reported the method for washing out phosphine from acetylene gas, and this method uses 70% phosphoric acid solution, but this method flow process is complicated, and gas needs to pass through lime milk scrubber pretreatment, also needs consumption The scrubbing acid is regenerated with pure oxygen and no mention is made of the residual concentration of phosphine after scrubbing
[0006] Chinese patent CN 1398658A (publication number) discloses a method for purifying yellow phosphorus tail gas by catalytic oxidation in a fixed bed, and develops a series of catalysts for catalytic adsorption of pH

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) After a certain amount of activated carbon carrier is ultrasonically washed with deionized water, it is placed in a constant temperature drying oven for drying, and is dried at a constant temperature of 110°C for 24 hours, then taken out and placed in a vacuum dryer, and naturally cooled to At room temperature, take it out and weigh it and record the data, repeat the above steps until the activated carbon carrier has a constant weight;

[0026] (2) Immerse the activated carbon carrier obtained in step (1) into cobalt chloride (CoCl 2 ) in an aqueous solution, ultrasonic impregnation at 20°C for 0.5h;

[0027] (3) Rinse the activated carbon carrier impregnated in step (2) with deionized water, and then put it into a constant temperature drying oven and dry it at 110° C. for 24 hours;

[0028] (4) Put the activated carbon carrier dried in step (3) into a muffle furnace for roasting, and roast at 400°C for 6h, then take it out and place it in a vacuum desiccator, and ...

Embodiment 2

[0031] (1) A certain amount of molecular sieve carrier is ultrasonically washed with deionized water, placed in a constant temperature drying oven, dried at a constant temperature of 110°C for 24 hours, then taken out and placed in a vacuum dryer, and cooled naturally under a vacuum of 0.1MPa to room temperature, take it out, weigh it and record the data, repeat the above steps until the molecular sieve carrier has a constant weight;

[0032] (2) The molecular sieve carrier obtained in step (1) is immersed in cobalt chloride (CoCl 2 ) in an aqueous solution, ultrasonic impregnation at 20°C for 0.5h;

[0033] (3) Rinse the molecular sieve carrier impregnated in step (2) with deionized water, and then put it into a constant temperature drying oven and dry it at 110° C. for 24 hours;

[0034] (4) Put the molecular sieve carrier dried in the step (3) into a muffle furnace for roasting, and roast at 400°C for 6h, then take it out and place it in a vacuum desiccator, and naturally ...

Embodiment 3

[0037] (1) After a certain amount of activated carbon fiber carrier is ultrasonically washed with deionized water, it is dried in a constant temperature drying oven, and dried at a constant temperature of 110°C for 24 hours, then taken out and placed in a vacuum dryer, and naturally dried under a vacuum of 0.1MPa Cool down to room temperature, take out and weigh and record the data, repeat the above steps until the activated carbon carrier has a constant weight;

[0038] (2) The activated carbon fiber carrier obtained in step (1) is immersed in cobalt chloride (CoCl 2 ) in an aqueous solution, ultrasonically impregnated at 20°C for 0.5h;

[0039] (3) Rinse the activated carbon fiber carrier impregnated in step (2) with deionized water, and then put it into a constant temperature drying oven and dry it at 110°C for 24 hours;

[0040] (4) Put the activated carbon fiber carrier dried in step (3) into a muffle furnace for roasting, and roast at 400°C for 6h, then take it out and ...

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PUM

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Abstract

The invention relates to a method for preparing transitional metal ion Co modified adsorbent which is used for purifying low-concentration phosphine and mainly used for removing low-concentration phosphine in industrial production tail gas, belonging to the technical field of application of adsorption separation technique in atmospheric pollution purification. The method comprises the following steps of: (1) carrying out ultrasonic washing and drying treatment to an adsorbing material carrier until a constant-weight carrier is formed; (2) selecting a soluble cobalt salt to carry out ultrasonic immersing modification to the pretreated adsorbent carrier; (3) washing and drying the immersed adsorbent carrier; and (4) roasting the dried adsorbent carrier, and reducing the temperature to room temperature. The adsorbent prepared in the invention is unnecessary to add accelerating agents, such as noble metals or high-contamination heavy metals and the like; when the adsorbent is used for adsorbing waste gas containing phosphine, the adsorption is conducted by the surface of the modified adsorbent; waste gas dephophorization can be realized after the adsorption is saturated; and the adsorption activity is higher within in a certain temperature range.

Description

1. Technical field [0001] The invention relates to a preparation method of a transition metal ion Co modified adsorbent for purifying low-concentration phosphine, which is mainly used for removing low-concentration phosphine in industrial production tail gas, and belongs to adsorption separation technology applied to air pollution purification technology field. 2. Technical background [0002] Phosphine gas is present in certain concentrations in the gases produced in the processes of yellow phosphorus preparation, magnesium powder preparation, sodium hypophosphite production, acetylene production, feed fermentation, grain fumigation, and semiconductor industry production. Direct discharge of phosphine gas in the tail gas into the atmosphere will cause environmental pollution and endanger human health. If the phosphine-containing tail gas, especially the yellow phosphorus tail gas rich in CO, is utilized, the catalyst will be poisoned due to the presence of phosphine gas, w...

Claims

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Application Information

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IPC IPC(8): B01J20/32C01B25/06
Inventor 唐晓龙余琼粉易红宏宁平杨丽萍
Owner KUNMING UNIV OF SCI & TECH
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