A novel approach for the investigation of reaction kinetics using a polytropic miniplant reactor featuring highly resolved fibre optic temperature measurement and FTIR gas phase analysis is presented methanol synthesis.

A mathematical model for the startup period of a fixed-bed reactor with first-order reaction kinetics, axial dispersion and film mass transfer resistance was formulated and solved analytically using Laplace transform. The solution can be used to correlate or predict the reactant concentration profiles in the effluent of the reactor. The effects of both the Peclet number and Biot number on the e...

A process scheme based on a series of fixed-bed reactors is presented as a possible alternative for carrying out the chemical looping combustion of methane at high pressure with ilmenite as oxygen carrier. The oxygen carrier is stationary and it is alternately exposed to reducing and oxidizing atmospheres by means of the periodic switching of the gas feeds (i.e., methane and air, respectively)....

A kinetic model for xylan hydrolysis in liquid hot water flow-through pretreatment was developed. The model utilized a declining xylan hydrolysis rate constant with increasing conversion in combination with direct xylooligomer degradation. The model was able to describe experimental results from flow-through pretreatment of corn stover and triticale straw at various pretreatment temperatures, a...

Modeling and simulation of fixed-bed reactors is usually based on classical pseudo-homogeneous modeling approaches that rely on simplifying assumptions and the use of semiempirical effective parameters, which have been adopted to results obtained from a certain experimental setup. This inevitably leads to problems when trying to perform reliable simulations for a priori predictions and optimiza...

This research paper presents a detailed review of the recent advances concerned with carrying out efficient solar chemical reactions by reviewing most reactors available in literature that use solid-gas or pyrolysis processes. Major groups chemistry design and manufacture wide range reactor configurations, widths, sizes, including directly radioactive particles. Solar heat up to 1000℃ can be ut...

The influence of backwashing on biological perchlorate reduction was evaluated in two laboratory scale fixed bed biofilm reactors using 1- or 3-mm glass beads as support media. Influent perchlorate concentrations were 50 microg/L and acetate was added as the electron donor at a concentration of 2 mg C/L. Perchlorate removal was evaluated at various influent dissolved oxygen (DO) concentrations....