Dechlorinating agent for high-temp gas and its preparing process

A high-temperature gas and dechlorination agent technology, applied in separation methods, chemical instruments and methods, and other chemical processes, can solve problems such as industrial application restrictions, and achieve the effects of low cost, good purification, and high chlorine capacity

Inactive Publication Date: 2002-02-06
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the above dechlorination agents use alkali metal and alkaline earth metal compounds as active components, and the purification degree is high. However, they are generally used under the condition of less than 500 ° C, so the industrial application of high temperature dechlorination is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Grind and extrude 20 kg of sepiolite, 55 kg of sodium carbonate, 10 kg of calcium hydroxide, 13 kg of kaolin and 2 kg of carboxymethyl cellulose in a grinder, and roast at 700°C for 4 hours to obtain this product Invented dechlorination agent.

[0027] The obtained dechlorination agent is subjected to a dechlorination test, and the dechlorination reaction conditions are: gas inlet hydrogen chloride concentration 1000-1500ppm, reaction space velocity 1500-2000hr -1 , The reaction temperature is 600°C. The dechlorination agent can reduce the hydrogen chloride content of the outlet gas to below 0.5ppm, and the breakthrough chlorine capacity is 35.7%.

[0028] The concentration of hydrogen chloride in the import and export gas is detected by the silver nitrate volumetric method, and the chlorine capacity of the solid dechlorination agent is analyzed according to the determination method of chlorine in coal.

Embodiment 2

[0030] 60 kilograms of sepiolite, 25 kilograms of calcium carbonate, 10 kilograms of sodium carbonate, 3 kilograms of carboxymethyl cellulose, and 2 kilograms of kaolin are ground and extruded in a grinder, and roasted at 750 ° C for 2 hours to obtain the present invention. Dechlorination agent.

[0031] The obtained dechlorination agent is subjected to a dechlorination test. The dechlorination reaction conditions are: the hydrogen chloride content of the high-temperature gas inlet is 1300-1500ppm, and the reaction space velocity is 1500-1800hr -1 , The dechlorination reaction temperature is 650°C. When the concentration of hydrogen chloride in the outlet gas is lower than 0.5ppm, the breakthrough chlorine capacity is 28.1%.

[0032] The analysis detection method of hydrogen chloride concentration and chlorine volume is the same as embodiment 1.

Embodiment 3

[0034] Grind and extrude 20 kg of sepiolite, 42 kg of sodium carbonate, 30 kg of calcium carbonate, 2 kg of kaolin, 3 kg of ammonium carbonate and 3 kg of carboxymethyl cellulose, then roast at 750°C for 2 hours to obtain The dechlorination agent of the present invention.

[0035] The obtained dechlorination agent is subjected to a dechlorination test, and the dechlorination reaction conditions are: the hydrogen chloride content of the high-temperature gas inlet is 1500-1800ppm, and the reaction space velocity is 1000-1700hr -1 , The dechlorination temperature is 650°C. When the concentration of hydrogen chloride at the gas outlet is less than 0.5ppm, the breakthrough chlorine capacity is 36.7%.

[0036] The analysis detection method of hydrogen chloride concentration and chlorine volume is the same as embodiment 1.

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Abstract

A high-temp dechlorinating agent is prepared from natural sepiolite as both active component and carrier, alkali-metal and alkali-earth metal compound as active component, and the inorganic or organic adhesive and pore-enlarging agent for high reaction power and stability. It can be used to remove hydrogen chloride from high-temp (650 deg.C) gas to lower than 0.5 ppm and make chlorine content reach 36%. Its advantages are high purifying power and chlorine content, simple preparing process and low cost.

Description

technical field [0001] The invention relates to a gas dechlorination agent, in particular to a composition for removing hydrogen chloride in high-temperature gas or other industrial gases. Background technique [0002] In chemical production, in order to ensure the normal operation of the system or reduce equipment corrosion, the removal of hydrogen chloride in the gas is often a very important purification process. The coal gasification combined cycle power generation (IGCC) and coal gasification fuel cell (MCFC) under development put forward new requirements for the removal of hydrogen chloride in gas under high temperature conditions. Hydrogen chloride in high temperature gas is very harmful to the corrosion of equipment, and even affects the normal operation of the system. For example, for the MCFC system, the hydrogen chloride in the gas can form a low boiling point compound with the electrolyte, which is easy to evaporate at high temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/04B01D53/68B01J20/04B01J20/10
Inventor 高晋生吴幼青李依丽豆斌林
Owner EAST CHINA UNIV OF SCI & TECH
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