Adsorbing agent for capturing CO2 in flue gas, and preparation method thereof

An adsorbent and flue gas technology, applied in the field of flue gas purification, can solve the problems of high separation cost, small molecular weight, low load capacity, etc.

Inactive Publication Date: 2012-09-12
SICHUAN TECHAIRS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently the main CO 2 The capture and separation methods mainly include absorption / adsorption method, membrane separation method, flue gas circulation combustion method, modified coal gasification combined cycle method, etc. The most commonly used industrially are amine-based chemical absorbents, such as monoethanolamine (MEA), Diethanolamine (DEA), triethanolamine (TEA), methyldiethanolamine (MEDA), etc., among which monoethanolamine MEA is considered the most suitable for coal-fired flue gas CO 2 Separation, its advantages are "small molecular weight, strong ability to absorb acid gas" to capture low concentration of CO in flue gas after combustion 2 The most advantage; its disadvantage is CO 2 The load capacity is low, the corrosion rate of equipment is high, amines will be degraded by other flue gas components, and the energy consumption of absorbent regeneration is high, which causes CO 2 High cost of separation

Method used

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  • Adsorbing agent for capturing CO2 in flue gas, and preparation method thereof
  • Adsorbing agent for capturing CO2 in flue gas, and preparation method thereof
  • Adsorbing agent for capturing CO2 in flue gas, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 8.0g of activated carbon AC302, place it in a drying dish, use a 1000ml graduated cylinder to measure 600ml of deionized water and pour it into a 2000ml beaker, then put the beaker into a water bath, and control the temperature of the water bath to 75°C. After 45 minutes, Test the temperature of the deionized water in the beaker. When the temperature of the deionized water reaches above 65°C, add 300ml of monoethanolamine taken from the graduated cylinder, wash the residual monoethanolamine in the graduated cylinder with a little deionized water, and pour it into the beaker; weigh K 2 CO 3 : 35.2g, CNTs: 3.8g, add them together into the beaker, control the liquid temperature in the beaker to 65-75°C; gently stir the carrier at the bottom of the beaker with a glass rod every 15-20 minutes; separate the beaker after 1.5 hours Carrier and solution in the solution, put the separated carrier into the reaction tube with electric heater temperature control, the temperatu...

Embodiment 2

[0024] Weigh 8.7g of activated carbon AC302, place it in a drying dish, use a 1000ml graduated cylinder to measure 800ml of deionized water and pour it into a 2000ml beaker, then put the beaker into a water bath, and control the temperature of the water bath to 70°C. After 45 minutes, Test the temperature of the deionized water in the beaker. When the temperature of the deionized water reaches above 65°C, add 200ml of monoethanolamine taken from the graduated cylinder, wash the remaining monoethanolamine in the graduated cylinder with a little deionized water, and pour it into the beaker; weigh K 2 CO 3 : 46.4g, CNTs: 5.6g, add them together into the beaker, control the liquid temperature in the beaker to 65-70°C; gently stir the carrier at the bottom of the beaker with a glass rod every 15-20 minutes; separate the beaker after 1.5 hours Carrier and solution in the solution, put the separated carrier into a reaction tube with electric heater temperature control, the temperatur...

Embodiment 3

[0027] Weigh 9.9g of activated carbon AC302, place it in a drying dish, use a 1000ml graduated cylinder to measure 800ml of deionized water and pour it into a 2000ml beaker, then put the beaker into a water bath, and control the temperature of the water bath to 67°C. After 45 minutes, Test the temperature of the deionized water in the beaker. When the temperature of the deionized water reaches above 65°C, add 220ml of monoethanolamine taken from the measuring cylinder, wash the residual monoethanolamine in the measuring cylinder with a little deionized water, and pour it into the beaker; weigh K 2 CO 3 : 39.2g, CNTs: 7.6g, add them together into the beaker, control the liquid temperature in the beaker to 65-67°C; gently stir the carrier at the bottom of the beaker with a glass rod every 15-20 minutes; separate the beaker after 1.5 hours Carrier and solution in the solution, put the separated carrier into a reaction tube with electric heater temperature control, the temperature...

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Abstract

The invention belongs to the field of flue gas purification technology, and particularly relates to an adsorbing agent for separating CO2 in the flue gas, and a preparation method of the adsorbing agent. The adsorbing agent comprises a carrier, an active component and an auxiliary agent, wherein the carrier is one or more of coke, activated carbon, carbon fiber (CMS), charcoal and carbon-containing solid material; the active component is one or more of monoethanolamine, diethanolamine, tetraethylenepentamine and pentaethylenehexamine; and the auxiliary agent is one or more of K2CO3 and carbon nano tubes (CNTs). The preparation method of the adsorbing agent comprises the steps of: soaking, filtering, drying in the hydrogen environment and the like. The adsorbing agent has the characteristics of hydrophilicity, high adsorption capacity for CO2 under the low-pressure condition, low nitrogen adsorption capacity, easiness in desorption, simple preparation technology, low production cost and the like.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, in particular to a method for separating CO in flue gas 2 Adsorbents and their preparation methods. Background technique [0002] Carbon dioxide is the main greenhouse gas and one of the main causes of global warming. my country's energy supply is still dominated by coal, 80% of which are used in thermal power, metallurgy, building materials and other industries. With the promulgation of the "Kyoto Protocol" and "Post-Kyoto Protocol", my country has actively responded to climate change and greenhouse gas emission reduction issues. The National Climate Change Program clearly puts forward the task of controlling the emission of carbon dioxide and other greenhouse gases. [0003] Currently the main CO 2 The capture and separation methods mainly include absorption / adsorption method, membrane separation method, flue gas circulation combustion method, modified coal gasification combine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/32B01D53/02
CPCY02C20/40
Inventor 钟娅令曾启明钟雨明陈天洪蔡跃明
Owner SICHUAN TECHAIRS
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