Experimental Measurements and Thermodynamic Modelling of Carbon Dioxide Capture with use of 2-(Ethylamino) Ethanol

Piotr Biernacki Sven Steinigeweg,Wilfried Paul Axel Brehm

doi:10.4172/2090-4541.1000177

Abstract

Carbon dioxide solubility was studied in 2.5 mass % and 5 mass % aqueous 2 (Ethylamino)ethanol (EAE; CAS 110- 73-6) solution, an interesting secondary amine prepared mainly from renewable resources, at high loading rates, at three temperature ranges (293.00K, 313.15 K, 333.15 K), and in pressure range from 289 to 1011 kPa. In addition to that, heat capacity (cp) was measured of examined solution, allowing determination of temperature dependent coefficients of ideal gas heat capacity equation. Afterwards, the electrolyte Non Random Two-Liquid model’s parameters were determined to represent the thermodynamic behaviour of the CO2 – EAE – H2O system with use of ASPEN® Plus V8.0 simulation software, indicating a good correlation between experimental and simulation results. As a consequence, model based calculation of the carbon dioxide capture with use of 2-(Ethylamino) ethanol is possible.

Highlights

Biogas produced through anaerobic digestion of organic wastes is already widely applicable process, which is often utilized in combined heat and power units (CHP)
Since amine scrubbing is the most technically and commercially mature method, which can be retrofitted to an existing plant [3], and according to Rochelle [4] in 2030 it probably will be the dominant method applied for coal-fired power plants, amine scrubbing was selected for this research. 2-(Ethylamino) ethanol (EAE) is a linear secondary amine which is linked to an ethyl group, was decided to be evaluated in this research
Methyldiethanolamine (MDEA) is often applied during amine washing to ensure H2S removal [2], its rate constant of second-order reaction is lower than for EAE [8], and existing biogas power plants already removed H2S prior to combustion at CHP unit [1,2]. 2-(Ethylamino)ethanol has been already proved as an absorbent for CO2 capture [9], and as an activator in aqueous N,N-diethylethanolamine (DEEA) solutions [10]

Summary

Introduction

Biogas produced through anaerobic digestion of organic wastes is already widely applicable process, which is often utilized in combined heat and power units (CHP). The main goal of this research was preparation of the model, determination of binary interaction parameters, which can be applied for upgrading existing biogas power plants to biomethane plants. At such plants prior to biogas combustion at CHP unit H2S is removed due to corrosion danger [1,2], it was decided to concentrate only on CO2 removal. Methyldiethanolamine (MDEA) is often applied during amine washing to ensure H2S removal [2], its rate constant of second-order reaction is lower than for EAE [8], and existing biogas power plants already removed H2S prior to combustion at CHP unit [1,2]. In this research the Electrolyte Non Random Two-Liquid (eNRTL) model was applied for modelling the EAE’s performance, since it has been widely applied for other amines like MEA [13], MEA and DEA [14], DGA [15], DGA and MDEA [16]

Objectives

Methods

Results