Analysis of the Macrokinetics of CO2 Sorption on 10%NaNO3/MgO Sorbent and Modeling of an Adsorber with a Hydrogen Capacity of 10 kg/h

IF 1.3 Q4 ENGINEERING, CHEMICAL
A. B. Shigarov, I. E. Nikulina, V. P. Pakharukova, D. I. Potemkin
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Abstract

This study proposes a first-order macrokinetic model for CO2 sorption on a 10 mol % NaNO3/MgO sorbent. According to the experimental gravimetric data, the maximum sorption capacity of the 10 mol % NaNO3/MgO sorbent is determined and does not depend on the partial pressure of CO2; at 320°C it is equal to 159% (based on the initial mass of the sample) or 13.4 mmol CO2/gsorb. The calculated value of the sorption constant kads at temperatures of 280–320°C and a CO2 partial pressure of 0.50–0.75 atm is 0.017 min–1 atm–1. Based on the obtained kinetics, modeling of adiabatic and isothermal CO2 adsorbers was performed within the framework of the technological scheme for producing 10 kg/h of hydrogen from natural gas at an operating pressure of 12 atm. The calculations showed that for the adsorber to function effectively intensive removal of the heat released during the sorption process is necessary. This allows for the sorption of CO2 for 30 min at a temperature of 300°C and a gas hourly space velocity GHSV = 1170 h–1, while the concentration of CO2 at the outlet in dry gas does not exceed 1.5 mol %.

Abstract Image

10%NaNO3/MgO吸附剂吸附CO2的宏观动力学分析及氢容量为10 kg/h吸附剂的建模
本文建立了10 mol % NaNO3/MgO吸附剂吸附CO2的一级宏观动力学模型。根据实验重量数据,确定了10 mol % NaNO3/MgO吸附剂的最大吸附量,该吸附剂的吸附量与CO2分压无关;在320°C时等于159%(基于样品的初始质量)或13.4 mmol CO2/gsorb。在温度为280 ~ 320℃,CO2分压为0.50 ~ 0.75 atm时,吸附常数kads的计算值为0.017 min-1 atm - 1。基于所获得的动力学,在操作压力为12 atm的天然气制氢10 kg/h的工艺方案框架下,对绝热和等温CO2吸附剂进行了建模。计算结果表明,为了使吸附器有效地发挥作用,必须对吸附过程中释放的热量进行强化去除。这允许在300°C的温度下吸附CO2 30分钟,气体每小时空速GHSV = 1170 h-1,而出口干气中的CO2浓度不超过1.5 mol %。
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来源期刊
Catalysis in Industry
Catalysis in Industry ENGINEERING, CHEMICAL-
CiteScore
1.30
自引率
14.30%
发文量
21
期刊介绍: The journal covers the following topical areas: Analysis of specific industrial catalytic processes: Production and use of catalysts in branches of industry: chemical, petrochemical, oil-refining, pharmaceutical, organic synthesis, fuel-energetic industries, environment protection, biocatalysis; technology of industrial catalytic processes (generalization of practical experience, improvements, and modernization); technology of catalysts production, raw materials and equipment; control of catalysts quality; starting, reduction, passivation, discharge, storage of catalysts; catalytic reactors.Theoretical foundations of industrial catalysis and technologies: Research, studies, and concepts : search for and development of new catalysts and new types of supports, formation of active components, and mechanochemistry in catalysis; comprehensive studies of work-out catalysts and analysis of deactivation mechanisms; studies of the catalytic process at different scale levels (laboratory, pilot plant, industrial); kinetics of industrial and newly developed catalytic processes and development of kinetic models; nonlinear dynamics and nonlinear phenomena in catalysis: multiplicity of stationary states, stepwise changes in regimes, etc. Advances in catalysis: Catalysis and gas chemistry; catalysis and new energy technologies; biocatalysis; nanocatalysis; catalysis and new construction materials.History of the development of industrial catalysis.
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