Screening method for solvent selection used in tar removal by the absorption process

Abstract

The aim of this paper is the study of the treatment of flue gas issued from a process of biomass gasification in fluidized bed. The flue gas contains tar which should be selectively removed from the fuel components of interest (e.g. H2, CO and light hydrocarbons) to avoid condensation and deposits in internal combustion engine. The chosen flue gas treatment is the gas-liquid absorption using solvents, which present specific physicochemical properties (e.g. solubility, viscosity, volatility and chemical and thermal stability) in order to optimize the unit on energetic, technico-economic and environmental criteria. The rational choice of the proper solvent is essential for solving the tar issue. The preselection of the solvents is made using a Hansen parameter in order to evaluate the tar solubility and the saturation vapour pressure of the solvent is obtained using Antoine law. Among the nine families of screened solvents (alcohols, amines, ketones, halogenates, ethers, esters, hydrocarbons, sulphured and chlorinates), acids methyl esters arise as solvents of interest. Methyl oleate has then been selected and studied furthermore. Experimental liquid-vapour equilibrium data using bubbling point and absorption cell measurements and theoretical results obtained by the UNIFAC-Dortmund model confirm the high potential of this solvent and the good agreement between experimental and theoretical results.

On-line liquid quench sampling and UV–Vis spectroscopy for tar measurements in wood gasification process gases

“…The scrubber removes tar compounds with molecular weights typically larger than naphthalene from the gas stream. This is in agreement with previous studies which report increased removal performances for increasing molecular weight of tar compounds [43,56,57]. An exemplary off-line UV-Vis spectrum of a diluted liquid sample (R1.A), taken before the RME scrubber, is presented in fig.…”

Application of the solubility parameter concept to assist with oral delivery of poorly water-soluble drugs – a PEARRL review

“…A HSP based search method was used to target a specific gel system and because the solvent in this case had a functional influence, its selection was of crucial importance . Solubility parameters can also be used for defining extraction processes, as described by Masurel et al . for the removal of tar from flue gas, but also other publication focus on the use of solubility parameters for liquid extraction, even though the applications are not necessarily pharmaceutical.…”

Experimental and Modeling Studies on the Removal of Tars from Coal‐Derived Syngas Using Methyl Oleate

“…Moreover, Masurel et al [28] screened several conventional solvents for the absorption of tars, including alcohols, amines, ketones, ethers, esters, halogenates, chlorinates, and hydrocarbons based on the criteria of technological as well as economic viability. Methyl oleate was found to be one of the most promising solvents for the absorption of tars due to its relatively lower vapor pressure, lower relative energy difference with tars, moderate viscosity, and non-toxic nature.…”