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Chemically modified chitosan mercury-removing adsorbent and preparation process thereof

A preparation process and adsorbent technology, applied in other chemical processes, chemical instruments and methods, separation methods, etc., can solve the problems of low removal efficiency and high economic cost, and achieve high cost performance, high mercury removal efficiency, and unique The effect of secondary pollution

Inactive Publication Date: 2010-09-01
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] deHg 0 Adsorbents are mainly activated carbon, fly ash and other minerals (zeolite, vermiculite and bentonite), but the removal efficiency is not high; and these adsorbents are treated with ZnCl 2 , CuCl 2 , KBr, KI and dialysis can greatly increase the adsorption capacity of mercury, but the economic cost is high

Method used

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  • Chemically modified chitosan mercury-removing adsorbent and preparation process thereof
  • Chemically modified chitosan mercury-removing adsorbent and preparation process thereof
  • Chemically modified chitosan mercury-removing adsorbent and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] CTS-Br-S series adsorbent preparation: take by weighing 4g chitosan, put into 100mL beaker, add 30mL deionized water (appropriate amount of absolute ethanol) and 0.42g concentrated sulfuric acid (concentration is 98%), stir After 1-3 hours, add 1g KBr, stir continuously for 4-6 hours, let stand for 10-15 hours, filter with suction, dry in an oven at 80-100°C, put it in a drying dish for later use, and record it as CTS-Br-S-410. Replace the consumption of sulfuric acid in the preparation of CTS-Br-S-410 with 2g sulfuric acid, prepare adsorbent CTS-Br-S-412 (wherein S represents that sulfuric acid is added in the preparation process of adsorbent, 410 and 412 represent respectively chitosan, modifier and sulfuric acid by the mass ratio of the above preparation method).

[0023] CTS-I-S series adsorbent preparation: Weigh 4g chitosan, put it into a 100mL beaker, add 30mL deionized water (appropriate amount of absolute ethanol) and 0.59g concentrated sulfuric acid (concentra...

Embodiment 2

[0025] CTS-Br-S-813 adsorbent: Weigh 8g chitosan, put it into a 100mL beaker, add 30mL deionized water (appropriate amount of absolute ethanol) and 3g sulfuric acid (concentration is 98%), stir for 1~ After 3 hours, add 1g of KBr, stir continuously for 4-6 hours, let stand for 10-15 hours, filter with suction, dry in an oven at 80-100°C, put it in a drying dish for later use, and record it as CTS-Br-S-813.

[0026] CTS-I-S-813 supplement: Weigh 8g chitosan, put it into a 100mL beaker, then add 30mL deionized water (appropriate amount of absolute ethanol) and 3g sulfuric acid (concentration: 98%), stir for 1-3h , add 1gKI, stir continuously for 4-6 hours, let stand for 10-15 hours, then filter with suction, dry in an oven at 80-100°C, put it in a drying dish for later use, and record it as CTS-I-S-813.

Embodiment 3

[0028] CTS-Br-S-1514 adsorbent: take by weighing 15g chitosan, put into 600mL beaker, then add 100mL deionized water (appropriate amount of absolute ethanol) and 4g concentrated sulfuric acid (concentration is 98%), stir for 1 ~3h later, add 1gKBr, stir continuously for 4h, let it stand for 10h, filter with suction, dry in an oven at 80-100°C, put it in a drying dish for later use, and record it as CTS-Br-S-1513.

[0029] CTS-I-S-1514 adsorbent: Weigh 15g chitosan, put it into a 600mL beaker, add 100mL deionized water (appropriate amount of absolute ethanol) and 4g concentrated sulfuric acid (concentration: 98%), stir for 1-3h Finally, add 1g KI, stir continuously for 4 hours, let it stand for 10 hours, filter it with suction, dry it in an oven at 80-100°C, put it in a drying dish for later use, and record it as CTS-I-S-1513.

[0030] In order to understand the performance of the adsorbent of the present invention, especially in nitrogen (N 2 ) atmosphere to study its effect ...

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PUM

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Abstract

The invention discloses an adsorbent used for removing mercury (Hg0) in coal smoke and a preparation process thereof. The adsorbent comprises chitosan and halogen elements of bromine and iodine; as improvement, sulfuric acid is added, wherein the mass ratio of the chitosan to an iodine (bromine) compound to the sulfuric acid is (1-15):1:(0.5-5). The adsorbent is prepared by utilizing the reaction of the kali salt of the halogen elements of bromine and iodine and the sulfuric acid and better characteristics of the chitosan to the active iodine and the bromine under an acidy condition. The adsorbent has high Hg0 removal efficiency, lower cost, industrialized application and no secondary pollution of products.

Description

technical field [0001] The invention relates to a method for removing Hg from the flue gas of a coal-fired power station 0 Adsorbent and its preparation process. Background technique [0002] The discharge of pollutants from the power industry has degraded the environment. The heavy metals and CO released by the burning of coal 2 Problems such as pollution and acid rain are seriously endangering the healthy life of human beings. Heavy metal mercury (Hg 0 , Hg 2+ and Hg p ) pollution is particularly serious; it is reported that the total amount of mercury emitted into the atmosphere in the world is 4400-7500 tons every year, a large part of which is emitted by coal combustion. Mercury and its compounds that exist in the environment or in production can enter the human body through the lungs through breathing, through the skin through dissolution, and through the digestive tract through diet, and can also enter the fetus from the mother's placenta. Mercury poisoning cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30B01D53/02
Inventor 向军胡松张安超孙路石苏胜周英彪
Owner HUAZHONG UNIV OF SCI & TECH
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