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Preparation method of compound absorbent for removing nitrogen oxide

A composite adsorption, nitrogen oxide technology, applied in chemical instruments and methods, separation methods, other chemical processes, etc., can solve problems such as high energy consumption, and achieve the effect of reducing operating costs and low prices

Active Publication Date: 2007-07-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in the variable temperature and pressure variable mixing process, the particularly preferred process conditions are: feed pressure: 15 to 200 gauge pressure (305 to 1615 kPa), feed temperature: 10 to 50°C, regeneration temperature: 30 to 100°C , Cleaning pressure: 0 to 30 gauge pressure (202 to 408 kPa), which will inevitably result in higher energy consumption

Method used

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  • Preparation method of compound absorbent for removing nitrogen oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0028] Embodiment 1~4: prepare adsorbent with modified zeolite powder

[0029] Weigh four parts of 300g zeolite raw materials respectively, prepare according to the mass concentration and volume of Table 1 and measure the hydrochloric acid solution, mix evenly, heat while stirring, after the hydrothermal reaction time listed in Table 1, cool to room temperature, and suction filter; Wash with deionized water, then add sodium hydroxide solution to neutralize, filter with suction, and dry. Then bake in the muffle furnace in the order of No. 1 to No. 4. In this way, four parts of modified zeolite powder were prepared.

[0030] Table 1

[0031] Example

[0032] Take the prepared No. 1-4 modified zeolite powder and calcium hydroxide respectively in the ratio of 1:1, 1.5:1, 1.8:1, and 2:1 by mass and mix evenly, add deionized water and stir evenly, squeeze The pressed shape and size can be determined according to the needs. In this embodiment, the columnar adsorbent extr...

Embodiment 5～8

[0033] Embodiment 5~8: prepare adsorbent with soaking salt zeolite powder

[0034] Take by weighing the modified zeolite powder that embodiment 1~4 makes, use different concentration CaCl in table 2 respectively 2 solution, soaked and stirred, suction filtered and dried to obtain salt-soaked zeolite powder.

[0035] Table 2

[0036] Example

[0037] The salt-soaked zeolite powder and calcium hydroxide obtained in Examples 5 to 8 are respectively 2: 1, 1.5: 1, 1.8: 1, and 1: 1 by weight. Mix evenly, add deionized water and stir, squeeze The pressed shape and size can be determined according to the needs. In this embodiment, the columnar adsorbent extruded into a cross section is dried. The adsorption method was used to determine the amount of nitrogen oxides adsorbed per gram of adsorbent. The adsorption data are listed in Table 2. It can be seen from the comparison of the data in Table 2 that the adsorbent made of zeolite powder soaked in salt has a large adsorpt...

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PUM

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Abstract

The invention relates to a method for preparing composite absorber which can remove nitrogen oxide. Said method comprises that: mixing zeolite powder and alcaine solution; mixing, heating, boiling, cooling, filtering; adding caustic soda to neutralize, filtering, drying, baking to prepare modified zeolite powder; mixing the modified zeolite powder with calcii chloridum solution, filtering, drying to obtain the salt zeolite powder; mixing the powder with calcium hydrate powder, adding deionized water; compressing and drying, to obtain the final composite absorber. The invention has low cost while the absorber has high adsorption capacity.

Description

technical field [0001] The invention relates to a preparation method of a composite adsorbent for removing nitrogen oxides, which is suitable for removing nitrogen oxides in waste gas at normal temperature. The technical field is a method of gas separation using a fixed adsorbent in general physical or chemical methods (IPC: B01D53 / 04). Background technique [0002] At present, the treatment of nitrogen oxides is mainly based on catalytic methods, such as the selective catalytic reduction method applied to the treatment of combustion flue gas, the non-selective catalytic reduction method and the three-way catalytic method for the treatment of motor vehicle exhaust. [0003] Adsorption methods are rarely used in the treatment of nitrogen oxides, and most of them are based on physical adsorption. [0004] Such as patent ZL98104145.0 (publication number CN1198359, announcement date: 1998.11.11) introduction is to adopt zeolite and alumina to make combined adsorbent to remove c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01D53/04
Inventor 李坚王艳磊冀宏金毓峑李依丽梁文俊
Owner BEIJING UNIV OF TECH
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