Preparation method of efficient adsorbent for gaseous mercury sampling

An adsorbent and gaseous mercury technology, applied in chemical instruments and methods, sampling devices, and other chemical processes, can solve problems such as measurement errors, lower adsorption rates, and must be prepared and used immediately, so as to enhance the capture capacity and improve Effect of adsorption rate and escape rate reduction

Active Publication Date: 2014-08-13
WUHAN TIANHONG INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0009] ① Wet monitoring is to absorb mercury through the absorption solution. If you want to measure mercury in different forms, you need a series of different solutions for separate adsorption. Use cold atomic absorption method or cold atomic fluorescence method for analysis. Wet monitoring generally uses As a reference for other mercury monitoring methods, it can measure the concentration of elemental mercury, oxidized mercury, particulate mercury and total mercury in the flue gas respectively, and finally obtain the average concentration of mercury during the sampling period. When using this method, attention should be paid to: absorption The liquid must be prepar

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] This embodiment takes 1000g activated carbon as an example to describe the preparation process in detail:

[0035] Step 1, activated carbon select specific surface area 1200m 2 / g, above 1000g of coconut shell activated carbon, soaked in deionized water for 24 hours.

[0036] Step 2, take it out and place it in a three-headed flask, blow it with 0.2L / min of nitrogen, and slowly raise the temperature to 110°C until it is dried.

[0037] Step 3, take 200ml of hydrochloric acid and place it in an acid washer, purify the hydrochloric acid, and obtain 150ml of hydrochloric acid distillate.

[0038] Step 4, place the dried activated carbon in a distillation scrubber, heat the high-purity hydrochloric acid distillate obtained in step 3, wash the activated carbon with hydrochloric acid vapor for 2 hours, and remove impurity metal ions in the activated carbon.

[0039] Step 5, repeatedly soaking with deionized water, cleaning the activated carbon, and soaking overnight.

[00...

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PUM

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Abstract

The invention relates to a preparation method of an efficient adsorbent for gaseous mercury sampling, and particularly relates to a preparation method of the efficient adsorbent for gaseous mercury sampling. According to the invention, except halogen and compounds thereof, iodine bromide and dimercaptosuccinic acid are used for modifying; by relevant experiment, the result shows that activated functional groups of carbonyl, halogen and the like which are increased on the surface of modified activated carbon are beneficial to chemical adsorption of the element mercury and divalent mercury, and especially a symmetrical stable structure formed by the combination of dimercaptosuccinic acid and mercury enables the adsorption capability of the modified activated carbon on mercury to be improved greatly.

Description

technical field [0001] The invention relates to a preparation method of a high-efficiency adsorbent, in particular to a preparation method of a high-efficiency adsorbent for gaseous mercury sampling. Background technique [0002] Coal is the most important primary energy in our country. In 2009, the coal output was close to 3 billion tons. The consumption of a large amount of coal has caused serious harm to the living environment of human beings. Due to its special physical and chemical properties and strong toxicity, mercury has become a pollutant of global concern. The use of coal is the main source of mercury in the atmosphere, followed by chlor-alkali industry, waste incineration and other sources. [0003] Mercury exists in the form of metallic mercury, inorganic mercury and organic mercury in nature. Inorganic mercury has monovalent and divalent compounds. Organic mercury includes methylmercury, dimethylmercury, phenylmercury and methoxyethylmercury. Different forms o...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30G01N1/22
Inventor 李虹杰沈诚李恺骅
Owner WUHAN TIANHONG INSTR
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