Novel multi-stage micro/mesoporous solid-state amine sorbent

A technology of adsorbent and solid amine, which is applied in the field of new multi-stage micro/mesoporous solid amine adsorbent, which can solve the problems of high regeneration energy consumption, volatile solvent, and easy corrosion of equipment

Inactive Publication Date: 2018-05-29
韩会义
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alcoholamine solution with CO 2 A chemical reaction occurs to generate carbamate, and carbamate can be desorbed and regenerated, but this method has disadvantages such as volatile solvents, high energy consumption for regeneration, and easy corrosion of equipment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0019] The preparation raw materials of novel multistage micro / mesoporous solid amine adsorbent are as follows: Tetraethylenepentamine (TEPA, purity 90%); HZSM-5 and MCM-41; Dehydrated alcohol (analytical grade); N2 (high purity, 99.999 %) and 15%CO 2 / 85%N 2 (volume fraction) mixture. The preparation method of the new multi-stage micro / mesoporous solid amine adsorbent is as follows: put HZSM-5 and MCM-41 in a constant temperature drying oven at 100°C for 12 hours to remove the physically adsorbed H 2 O and CO 2 ; Then physically mix HZSM-5 and MCM-41 according to different mass ratios to obtain a composite molecular sieve, which is named xHZSM-5 / yMCM-41. Among them, x / y is the mass ratio of HZSM-5 and MCM-41. The solid amine adsorbent was prepared by impregnation method. Dissolve a certain amount of TEPA in 30mL of absolute ethanol, and sonicate for 15min until TEPA is completely dissolved; add 1g of composite molecular sieve to the above solution, and sonicate for 3h; p...

Embodiment example 2

[0021] Weigh 1 g of adsorbent and place it in the reactor, and purging at 100 °C for 1 h in a high-purity N2 atmosphere of 30 mL / min to remove physically adsorbed H 2 O and CO 2 . Cool the adsorbent to the adsorption temperature, and switch the sampling gas to 15%CO2 / 85%N 2 (volume fraction), start the adsorption experiment. Export CO 2 The concentration is detected by a gas chromatograph (PEClarus500, the United States), when the outlet CO 2 Concentration equal to import CO 2 concentration, CO 2 Adsorption is complete. Raise the temperature of the adsorbent to 100°C and switch the sampling gas to N 2 , start the desorption experiment. When the outlet detects no CO 2 when CO 2 Desorption is complete. Lower the temperature to the adsorption temperature and switch the injection gas to 15% CO 2 / 85%N 2 (volume fraction), start the next cycle experiment.

Embodiment example 3

[0023] The change of the functional group of the composite molecular sieve before and after TEPA modification was measured and analyzed by a Fourier transform infrared spectrometer (TENSOR-27, BRUKER Company, Germany). －1 scanning. Results and analysis: HZSM-5 / MCM-41 at 1080 and 791cm －1 The asymmetric and symmetric stretching vibration peaks of the Si-O-Si bond appeared at 3450cm －1 The stretching vibration peak of Si-OH and physically adsorbed water appeared at 1655cm －1 The deformation vibration peak of physically adsorbed water appears at . After loading 20% ​​and 30% TEPA, the characteristic peaks of HZSM-5 / MCM-41 still existed, indicating that the addition of TEPA did not change the framework structure of HZSM-5 / MCM-41. After TEPA modification, HZSM-5 / MCM-41 at 2956 and 2845cm －1 Symmetric and asymmetric stretching vibration peaks of -CH- appeared at 1562, 1478 and 1228cm －1 The asymmetric and symmetric stretching vibration peaks of N-H and the stretching vibration ...

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Abstract

A novel multi-stage micro / mesoporous solid-state amine sorbent is disclosed. HZSM-5 with MCM-41 are mixed in different mass ratios to obtain composite molecular sieve supports; the composite molecularsieve supports are loaded onto composite molecular sieves by an impregnation method by use of tetraethylene pentamine (TEPA) as a modifier to prepare a series of novel multi-stage micro / mesoporous structural solid-state amine sorbents. When the mass ratio of HZSM-5 to MCM-41 is 1:1, the TEPA loading is 30%, the adsorption temperature is 55DEG C, and the gas inlet flow rate is 30 mL / min, the equilibrium adsorption amount is as high as 3.57 mmol / g, and after 10 cycles of adsorption and desorption, the adsorption amount is decreased by only 8.1%. The adsorption process of the HZSM-5 / MCM-41-30% TEPA for CO2 includes a rapid breakthrough adsorption phase and a relatively-slow gradual equilibrium phase, and the penetration adsorption amount is close to 80% of the equilibrium adsorption amount.The adsorption process of the HZSM-5 / MCM-41-30% TEPA for the CO2 is in accordance with Avrami kinetic model, indicating that CO2 adsorption is a result of physical adsorption and chemical adsorption.

Description

technical field [0001] The invention relates to an adsorbent, in particular to a novel multilevel micro / mesoporous solid amine adsorbent. Background technique [0002] In recent years, anthropogenic CO in the atmosphere 2 Emissions are growing rapidly, especially CO2 emissions from the combustion of fossil fuels, which has attracted widespread attention. According to the forecast of the United Nations Intergovernmental Panel on Climate Change (IPCC), by 2050 atmospheric CO 2 Concentration will reach 550×10 －6 . Among fossil energy sources, coal accounts for about 40% of global energy, and more than 70% of China's electricity is produced by coal-fired power plants. Therefore, the capture and separation of CO2 in the flue gas of coal-fired power plants is imminent. At present, the large-scale application of CO in industry 2 The separation technology is alcohol amine solution absorption method, commonly used absorbents are ethanolamine (MEA) and diethanolamine (DEA). Alc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30B01D53/02
CPCB01D53/02B01D2257/504B01J20/186B01J20/22B01J20/2808B01J20/28083Y02C20/40
Inventor 韩会义
Owner 韩会义
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