Process analysis for the carbon dioxide chemical absorption–regeneration system

Abstract

The process analysis for the post-combustion CO2 capture using amine-based solvents is nowadays a fundamental step in its industrial scale design. In this work, the absorption-solvent regeneration system is deeply analyzed for different values of the loading in the solvent entering the absorber. The importance of the temperature and composition column profiles is highlighted for both the columns. In particular, the tight connection between the profiles and the L/G ratio is found to influence the choice of solvent flow rate for what concerns the absorber. On the other hand, an alternative configuration for the stripper is proposed together with a new criterion for the evaluation of the packing height. Finally, it is found that, in order to minimize the energy consumption in the stripper, the rich solvent must be sent at the highest possible temperature, taking into account the limitations imposed by the minimum temperature approach in the cross heat-exchanger and the solvent degradation.

Scale-Dependent Techno-Economic Analysis of CO2 Capture and Electroreduction to Ethylene

“…Each separation stage was assigned to an equation of state according to the literature (Supporting Information Note 2). − C 2 H 4 was the main product, but syngas (a mixture of carbon monoxide (CO) and hydrogen (H 2 )), oxygen (O 2 ), and C 2 H 5 OH were valorized as coproducts.…”

Process Design for the Treatment of the Irving Oil Refinery Flue Gas: Heat Recovery, Energy Analysis and CO2 Capture

“…The treated gas is conveyed to a water wash, in order to lower the residual amine content in the gas to less than 20 mg/Nm 3 . The rich-solvent is pumped and sent to the regenerator (DES), which is a distillation column operating at 1.8 bar [5] and provided with a 6m high Mellapak packing [4]. It is remarkable that both columns' packing height and stripper pressure are selected as a result of previous CO2 capture plant optimization works carried out under comparable flue gas composition and process operating conditions.…”

“…The purchase cost under standard condition (CP 0 ) can be defined using expression (5), where A represents the characteristic dimension of the specific unit and K1, K2 and K3 are coefficients depending on the considered unit operation. log ( ) log ( ) (log ( ))…”

Treatment of Manure and Digestate Liquid Fractions Using Membranes: Opportunities and Challenges

“…Ammonia is stripped from pre-treated manure using air, steam or biogas and then absorbed in an acid solution to produce added-value fertilizers [ 105 , 106 , 107 ]. The modelling of this systems represents a challenge as highlighted for an analogous system by Madeddu et al [ 108 , 109 ].…”