Combination of Refractometry and Densimetry – A Promising Option for Fast Raw Methanol Analysis

Abstract

Besides water, raw methanol produced from steel mill gases within the Carbon2Chem® project contains dissolved carbon dioxide. Refractometry and densimetry were investigated as analysis methods to analyze raw methanol samples quickly and reliably. To verify existing calibration curves, a set of standard solutions from pure chemicals was produced. Experimental results differed significantly from published refractive index data, especially in the range of high methanol weight fractions, which are of particular interest for the Carbon2Chem® project.

Empirical Hydrogen Bonding Donor (HBD) Parameters of Organic Solvents Using Solvatochromic Probes – A Critical Evaluation

“…There are numerous studies in the literature on the physical properties and structure of methanol/water. References [56][57][58][59][60][61] are are only a small selection, but they provide crucial information. To gain a comprehensive understanding of the solvatochromism of B30 in methanol/water or other solvent mixtures, it is necessary to know the complex structure of the solvent mixture.…”

“…This includes the macroscopic properties such as density, refractive index or dielectric constant of the mixture as a function of both mole fraction and volume fraction. [56][57][58] It is also important to know the thermodynamics of the system. [59] Sophisticated measurement techniques such as dielectric ChemPhysChem spectroscopy [60] or neutron scattering [61] allow insights into the dynamic and microstructure of the solution mixtures.…”

“…There are shoulders and the position of the UV/Vis absorption band is concentration-dependent. [58,59] Therefore, often secondary Z-values, derived from pyridine-Noxide, [72] were used for correlations which makes the situation as a whole for interpretation of genuine Z-values of aqueous systems doubtful. [40c] Despite these concerns there are several clear results.…”

Experimental Validation of Methanol Synthesis from Steel Mill Gases Using a Miniplant Setup

“…Composition of the raw methanol was analyzed by an Abbemat 650 online refractometer. The methanol and water content were determined online by the refractive index according to the methodology presented in [27]. Downstream the refractometer, the liquid product was led into a vessel with a maximum operating pressure of 10 bar.…”

Implementation of Cross‐Industrial Networks Targeting CO2 Reduction from a Systemic Approach

“…Additionally, product synthesis at laboratory-scale using cleaned steelworks off-gases serve as proof of suitable catalyst performance over an extended period. Furthermore, the quality of the product (e.g., raw methanol) [28] is being evaluated since it provides important information for the design of purification units at industrial scale. Another unit capable of producing larger quantities of raw methanol compared of those available at present time is scheduled to be installed and ready for operation using cleaned steelworks off-gases in summer/autumn 2022 at the Carbon2Chem pilot plant facilities.…”