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Method for preparing modified calcium oxide-based high-temperature carbon dioxide adsorbent

A carbon dioxide and calcium oxide technology, applied in chemical instruments and methods, separation methods, other chemical processes, etc., can solve problems such as microstructure changes, insufficient heat resistance, affecting adsorption capacity and recycling adsorption rate, etc., to achieve maximum adsorption High capacity, fast adsorption speed, and low production cost

Active Publication Date: 2016-12-07
静乐县亨鑫建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main technical problem to be solved by the present invention is to solve the problem that the traditional calcium oxide as a high-temperature carbon dioxide adsorbent has insufficient heat resistance, and it is easy to cause changes in its microstructure under the action of high-temperature thermal decomposition, thereby affecting its adsorption capacity and recycling adsorption rate. , providing a method for preparing a modified calcium oxide-based high-temperature carbon dioxide adsorbent
The present invention modifies the surface of calcium carbonate by ginkgo flavonoids rich in hydroxyl, increases its surface hydroxyl functional groups, provides active sites for aluminum source deposition, and deposits a layer of crystalline alumina on the surface of calcium oxide through high-temperature calcination, increasing the calcium oxide. Heat resistance, while improving the adsorption capacity of calcium oxide to carbon dioxide, which solves the lack of heat resistance of traditional calcium oxide adsorbents. Under the action of high temperature thermal decomposition, it is easy to cause changes in its microstructure, thereby affecting its adsorption capacity and recycling adsorption rate problem, has broad application prospects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] First weigh 2kg of white jade snail shells and pour them into a wooden barrel, add a 5% sodium chloride solution with a mass concentration 5 times the total volume of the snail shells into the barrel, place it on a shaker and oscillate and soak overnight, and filter and separate the snails after shaking The shells were dried in an oven at 105°C for 2 hours; the dried snail shells were pulverized in a jet mill to separate and obtain fragments with a particle size of 0.5 cm, and then put the fragments into a stainless steel mortar and continued manual grinding for 1 hour Pass through a 200-mesh standard sieve to obtain white calcium carbonate powder for later use; weigh 1 kg of ginkgo fruit and peel it to get the pulp, put the ginkgo pulp and absolute ethanol into a wet ball mill according to the solid-to-liquid ratio of 1:3, and then put the ginkgo pulp into a wet ball mill according to the ratio of ball to material Add zirconia ball milling beads to the ball mill tank at...

example 2

[0023]First weigh 2.5kg of white jade snail shells and pour them into a wooden barrel, add a 6% sodium chloride solution with a mass concentration 5 to 8 times the total volume of the snail shells into the barrel, place it on a shaker and oscillate and soak overnight, and filter after the oscillation The separated snail shells were dried in an oven at 107°C for 3 hours; the dried snail shells were pulverized in a jet mill to separate and obtain fragments with a particle size of 0.7 cm, and then put the fragments into a stainless steel mortar to continue artificial Grind for 1.5 hours and pass through a 200-mesh standard sieve to obtain white calcium carbonate powder for later use; weigh 1.5kg of ginkgo fruit and peel it to get the pulp, and put the ginkgo pulp and absolute ethanol into a wet ball mill according to the solid-to-liquid ratio of 1:3. Then add zirconia ball milling beads to the ball mill tank according to the ball-to-material ratio of 1:20, and discharge the materi...

example 3

[0026] First weigh 3kg of white jade snail shells and pour them into a wooden barrel, add a 7% sodium chloride solution with a mass concentration 8 times the total volume of snail shells to the barrel, place it on a shaker and oscillate and soak overnight, after the oscillation is completed, filter and separate to obtain snails The shells were dried in an oven at 110°C for 4 hours; the dried snail shells were pulverized in a jet mill to separate and obtain fragments with a particle size of 1.0 cm, and then put the fragments into a stainless steel mortar and continued manual grinding for 2 hours. Pass through a 200-mesh standard sieve to obtain white calcium carbonate powder for later use; weigh 2kg of ginkgo fruit and peel it to get the pulp, put the ginkgo pulp and absolute ethanol into a wet ball mill according to the solid-to-liquid ratio of 1:3, and then put the ginkgo pulp into a wet ball mill according to the ratio of ball to material Add zirconia ball milling beads to th...

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Abstract

The invention discloses a method for preparing a modified calcium oxide-based high-temperature carbon dioxide adsorbent and belongs to the technical field of adsorbents. The method disclosed by the invention comprises the following steps: taking snail shells as raw materials, grinding to obtain calcium carbonate through brine wash grinding, performing compound modification on calcium carbonate by using flavones-enriched ginkgo extract and microbes, coating the carbonic acid surface with aluminum source by adopting a hydrothermal deposition method, and performing high-temperature calcinations to obtain the carbon dioxide adsorbent. According to the invention, the surface of calcium carbonate is modified by hydroxyl-enriched ginkgetin, so that hydroxyl functional groups on the calcium carbonate surface are increased, active sites are provided for aluminum source deposition, an aluminum oxide crystal layer is deposited on the calcium oxide surface due to high-temperature calcination, and the heat resistance of calcium oxide is improved. Meanwhile, the adsorbing capacity of calcium oxide on carbon dioxide is improved, the problems that the adsorbing capacity and recycled adsorption rate of calcium oxide are influenced because the traditional carbon dioxide adsorbent is insufficient in heat resistance and a microstructure of calcium oxide easily changes under the effect of high temperature cracking are solved, and the method has wide application prospects.

Description

technical field [0001] The invention discloses a preparation method of a modified calcium oxide-based high-temperature carbon dioxide adsorbent, which belongs to the technical field of adsorbents. Background technique [0002] Carbon dioxide is the main gas that causes the greenhouse effect. The world's carbon dioxide emissions are 20 billion per year, of which fossil fuel thermal power plants account for 1 / 3 of carbon dioxide emissions, and the continuous increase of such emissions has brought great impetus to the sustainable development of energy, The protection of the ecological environment and the survival of human beings have brought serious impacts. High-temperature waste gas from high-energy-consuming industries such as coking plants and thermal power plants contains a large amount of carbon dioxide. Direct emission will have adverse effects on the environment and cause a lot of waste of heat energy. In the coal-to-natural gas process using syngas as raw material, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/04B01J20/30B01D53/02
CPCB01D53/02B01D2257/504B01J20/041B01J2220/4881Y02C20/40
Inventor 周荣林茂平陆娜
Owner 静乐县亨鑫建材有限公司
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