The kinetics of the liquid-phase hydrogenation of furfuraldehyde to furfuryl alcohol over a 5% Pt/C catalyst was studied in a slurry reactor. The solvent used was a mixture of 2-propanol and water (12.4% w/w). At the temperatures (403-448 K) and pressures (1.03-2.06 MPa) studied, all mass-transfer resistances (gas-liquid, liquid-solid, and intraparticle diffusion) were absent. The initial rate data were analyzed using a power-law model. The initial rates increased almost linearly with hydrogen concentration at all temperatures. The reaction showed a zeroth-order dependence with respect to furfuraldehyde above a feed concentration of 0.13 kmol m -3 . Below this value, the order was found to be 0.86. Therefore, a Langmuir-Hinshelwood-type model for a dual-site mechanism with molecular adsorption of all species was proposed, and this model provided the best fit of the experimental data. Catalyst reusability studies showed that the catalyst could be reused without any adverse effects.

N,N-Diethylethanolamine (DEEA), which can be prepared from renewable resources, represents a candidate alkanolamine for CO2 removal from gaseous streams. In this work, the reaction of CO2 with aqueous solutions containing N,N-diethylethanolamine (DEEA) was studied in a stirred cell reactor with a plane, horizontal gas−liquid interface, in the range of temperatures 298−308 K. The DEEA concentration in the aqueous solutions was varied in the range 2−3 kmol/m3. The liquid-side mass transfer coefficient and a combined parameter comprising the reaction rate constant and the diffusivity and solubility of CO2 in DEEA solutions were evaluated. The effect of the addition of piperazine (PIP) as a possible absorption activator was studied, and it was found that even with a small amount of PIP (0.1 kmol/m3) added, the CO2 absorption rate increased.

The kinetics of the reaction of CO 2 with aqueous formulated solutions containing 50 wt % N-methyl-2-pyrrolidone (NMP) and 10 wt % diethylene glycol (DEG) (relative to water) and various amounts of monoethanolamine (MEA) were studied in a stirred cell reactor with an undisturbed gas-liquid interface at 303 K, using the fall in pressure technique. The MEA concentration in the formulated solution was varied in the range 1.5-2.5 kmol m -3 . The densities and viscosities of these amine solutions were measured. The physical properties such as solubility and diffusivity of CO 2 in these amine solutions were estimated using N 2 O analogy. The overall reaction could be regarded as a reaction between CO 2 and MEA in parallel with the reaction of CO 2 with NMP.