Absorption Of CO2 In Water Research Articles

Comparison between the Performances of a Well-Stirred Slurry Reactor and a Spray Loop Reactor for the Alkylation of p-Cresol with Isobutene

The kinetics of the alkylation of p-cresol with isobutene has been studied, first of all, in a well-stirred slurry reactor. Preliminary runs of CO2 absorption in water and of isobutene absorption in p-cresol, in the same reactor, have been made for estimating the gas−liquid mass-transfer coefficient in an independent way. The kinetic model, developed in a previous work, has been improved and the related parameters have been determined by mathematical regression analysis of many kinetic runs. Different kinetic runs have then been performed also by using a spray tower loop reactor (STLR) in similar physical conditions. These runs have been simulated in a satisfactory way by using the same kinetic model and parameters, changing only mass-transfer parameters for taking into account the different fluid dynamic conditions. The performances obtained by the two different reactors are in some conditions comparable. This work has demonstrated, therefore, the possibility and the convenience of extending the use of S...

Mass Transfer and Kinetics in Spray-Tower-Loop Absorbers and Reactors

In this work we have studied the kinetic and mass-transfer behavior of spray-tower-loop absorbers and reactors. For this purpose, we have investigated mass-transfer rates in the physical absorption of CO2 in water and the effect on mass transfer of respectively a moderately fast reaction, such as the ethoxylation of nonylphenol or fatty alcohol, and an extremely fast reaction, such as the one between CO2 and an aqueous NaOH solution. Spray nozzles used have been geometrically and fluid-dynamically characterized. Experimental results have been interpreted by considering the drops to be internally stagnant or well-mixed. We have shown that an internally well-mixed drops model is more reliable. Moderately fast reactions, such as ethoxylation, (Hatta number of about 1) do not affect mass transfer, while extremely fast reactions require the introduction of an enhancement factor. We have proposed a semiempirical correlation for calculating this factor. Our work could be useful for modeling and simulating spray-tower-loop absorbers and reactors.

METHOD FOR MEASURING CO2 ABSORPTION IN CO2 and N2 PACKAGED FRESH MEAT1

Headspace gas composition of meat stored in modified atmosphere packaging (MAP) undergoes dynamic changes as a result of packaging film permeability, postmortem metabolic activity, CO2 absorption in water and lipid, and bacteria growth and respiration. A combined analytical and experimental method was developed to investigate CO2 absorption by packaged fresh meat in a gas‐impermeable environment and during isothermal storage. the ideal gas law was used as a theoretical basis and a gas‐impermeable and constant‐volume chamber was constructed to evaluate the theoretical derivation. Changes in headspace pressure caused by dynamic interactions between beef and MAP atmospheres were monitored to predict concentration changes of CO2 within the chamber. the proposed methodology for measuring CO2 concentration changes was confirmed by gas analysis and proved valid for prediction of headspace CO2 concentration changes in MAP gas‐impermeable systems within the range of initial gas composition 20% to 100% CO2 balanced with N2, at temperatures ranging from 3 to 13C, and an initial headspace pressure of 155 kPa.

An equipment for mass and heat transfer to a film of liquid flowing down a plane surface. II. The mass transfer coefficient and the efficiency at absorption of CO2 in water

An equipment for mass and heat transfer to a film of liquid flowing down a plane surface. II. The mass transfer coefficient and the efficiency at absorption of CO2 in water

A partition cell for the study of gas‐liquid equilibria under pressure

AbstractA simplified partition cell has been developed for the investigation of gas‐liquid equilibria. In it, the two phases may be brought to equilibrium fairly rapidly, isolated and then sampled separately. The cell gives results comparable with those already published by other workers. Results for the absorption of CO2 in water at 30° and pressures up to 300 p.s.i.g. are given.