Method for preparing silver mercury removing agent

A mercury removal and silver-based technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of complicated process and low mercury removal precision, achieve simple process, improve mercury removal precision, and reduce production costs

Active Publication Date: 2015-05-27
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the mercury removal agent prepared by using silver nitrate impregnating solution in the prior art has low mercury removal accuracy and complicated preparation process, and further provides a silver-based mercury removal agent with high mercury removal accuracy and simple process. The preparation method of mercury removal agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Dissolve 4.74g (0.03mol) of anhydrous sodium thiosulfate in 50ml of water to prepare an aqueous solution of sodium thiosulfate;

[0025] (2) Dissolve 0.85g (0.005mol) of silver nitrate in 50ml of water to prepare an aqueous solution of silver nitrate;

[0026] (3) Slowly drop the silver nitrate aqueous solution in the step (2) into the sodium thiosulfate aqueous solution in the step (1) at a speed of 12ml / min, and stir rapidly at a speed of 30r / min to obtain Silver thiosulfate impregnation solution, stored in a dark place;

[0027] (4) 40g of the particle size is 1mm, the pore volume is 0.3ml / g, the specific surface area is 100m 2 / g of alumina ball carrier is impregnated in the silver thiosulfate impregnating solution in the step (3), after impregnated in the dark to saturation, drained for 30min, and dried at 90°C for 5h to obtain a silver-based mercury removal agent a.

Embodiment 2

[0029] (1) Dissolve 9.5g (0.05mol) of anhydrous potassium thiosulfate in 50ml of water to prepare an aqueous solution of sodium thiosulfate;

[0030] (2) Dissolve 1.7g (0.01mol) of silver nitrate in 50ml of water to prepare an aqueous solution of silver nitrate;

[0031] (3) Slowly drop the silver nitrate aqueous solution in the step (2) into the sodium thiosulfate aqueous solution in the step (1) at a speed of 30ml / min, and stir rapidly at a speed of 100r / min to obtain Silver thiosulfate impregnation solution, stored in a dark place;

[0032] (4) The 50g particle size is 3mm, the pore volume is 0.4ml / g, and the specific surface area is 300m 2 The active carbon carrier per g is impregnated in the silver thiosulfate impregnating solution in the step (3), and after impregnated in the dark to saturation, drained for 30min, and dried at 100°C for 3.5h to obtain the silver-based mercury removal agent B .

Embodiment 3

[0034] (1) Dissolve 17.76g (0.12mol) of anhydrous ammonium thiosulfate in 50ml of water to prepare an aqueous solution of sodium thiosulfate;

[0035] (2) Dissolve 5.1g (0.03mol) of silver nitrate in 50ml of water to prepare an aqueous solution of silver nitrate;

[0036] (3) Slowly drop the silver nitrate aqueous solution in the step (2) into the sodium thiosulfate aqueous solution in the step (1) at a speed of 80ml / min, and stir rapidly at a speed of 200r / min to obtain Silver thiosulfate impregnation solution, stored in a dark place;

[0037] (4) The 50g particle size is 5mm, the pore volume is 0.6ml / g, and the specific surface area is 700m 2 The activated carbon carrier / g is impregnated in the silver thiosulfate impregnating solution in the step (3), protected from light until saturated, drained for 30min, and dried at 110°C for 2h to obtain the silver-based mercury removal agent C .

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Abstract

The invention provides a method for preparing a silver mercury removing agent, and belongs to the technical field of mercury removing agents. The method comprises the following steps: (1) preparing a thiosulfate aqueous solution; (2) preparing a silver nitrate aqueous solution; (3) slowly dropwise adding the silver nitrate aqueous solution in the step (2) into the thiosulfate aqueous solution in the step (1), constantly stirring to obtain a silver thiosulfate impregnating solution, and preserving in a dark place; (4) immersing a carrier in the silver thiosulfate impregnating solution in the step (3), immersing in a dark place until the carrier is saturated, draining, and drying to obtain the silver mercury removing agent. The silver mercury removing agent prepared by the method has the advantages of simple operation, low production cost and high mercury removing accuracy.

Description

technical field [0001] The invention relates to a preparation method of a silver-based mercury removal agent, belonging to the technical field of mercury removal agents. Background technique [0002] A small amount of mercury exists in natural gas, liquefied petroleum gas, and liquid hydrocarbon feedstocks (such as naphtha, condensate, and distillate oils, etc.), and the presence of mercury can cause the following problems: amalgamation of aluminum heat exchangers Damage; poison expensive catalysts in downstream units, greatly reducing their life; contaminate shipping containers. In addition, mercury is one of the most important toxic substances in oil and gas. After burning oil and gas, mercury will enter the atmosphere and cause environmental pollution. Therefore, mercury must be removed from the above materials before use. [0003] Mercury removal agents commonly used in the prior art include silver sulfide mercury removal agents. For example, U.S. patent document US409...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30
CPCB01J20/0281B01J20/3234B01J2220/4806
Inventor 李新黄波刘振义成峻青李海英
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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