AbstractProcess computers routinely collect hundreds to thousands of pieces of
data from a multitude of plant sensors every few seconds. This has caused a
“data overload” and due to the lack of appropriate analyses very little is
currently being done to utilize this wealth of information. Operating personnel
typically use only a few variables to monitor the plant's performance. However,
multivaria... hiện toàn bộ
AbstractFor processes described by linear transfer functions with additive
disturbances, the best possible control in the mean square sense is realized
when a minimum variance controller is implemented. It is shown that an estimate
of the best possible control can be obtained by fitting a univariate time series
to process data collected under routine control. No ‘identifiabüity’ constraints
need b... hiện toàn bộ
AbstractThe kinetics of sorption of three basic dyes, namely, Chrysoidine (BO2),
Astrazon Blue (BB3) and Astrazone Blue (BB69) onto sphagnum moss peat have been
investigated. The study focuses on the application of three sorption kinetic
models for predicting the uptake of basic dyes. The sorption behaviour is found
to be second order, based on the assumption of a pseudo‐second order mechanism.
Th... hiện toàn bộ
Raoof Bardestani, Gregory S. Patience, Serge Kaliaguine
AbstractGas physisorption is an experimental technique based on equilibrium Van
der Waals interactions between gas molecules and solid particles, that
quantifies the specific surface area (SSA), pore size distribution (PSD), and
pore volume of solids and powders. The performance of catalysts, absorbents,
chromatography column materials, and polymer resins depends on these
morphological properties.... hiện toàn bộ
AbstractProblems involving fluid flow past permeable surfaces have customarily
been solved by matching Darcy's Law with the Navier‐Stokes equation via an
empirical slip‐flow boundary condition at these surfaces. The present analysis
serves to place the semi‐empirical theory proposed by Beavers and Joseph (1967)
on a more rigorous physical and mathematical basis. It is demonstrated that the
predict... hiện toàn bộ
AbstractThe kinetics of the pyrolysis of lignocellulosic materials was studied
with a view of providing simple kinetic models for engineering purposes.
Experimental data obtained by means of thermal analysis techniques suggest that
the pyrolysis of fine particles (below 1 mm) can be considered to be controlled
by pyrolysis kinetics. The rate of pyrolysis of one biomass type can be
represented by t... hiện toàn bộ
AbstractEmulsion refers to a mixture that includes two or more liquid phases.
The uses of emulsions are found in several chemical, energy, and environmental
industries such as the food, health care, chemical synthesis, and firefighting
sectors. Water‐in‐oil emulsions are formed spontaneously during oil production
when oil and water are mixed together and in the presence of asphaltene as a
naturall... hiện toàn bộ
AbstractIn order to improve the extraction of nanocrystalline cellulose (NCC)
from sulfuric acid hydrolysis of chemical pulps, we have studied the effect of
hydrolysis conditions on the degree of polymerization (DP), the extent of
sulfation, morphological, and solid‐state characteristics of the extracted
materials vis‐à‐vis yield.Our results demonstrate that sulfation plays a
significant role in (... hiện toàn bộ
AbstractA theoretical treatment is presented which attempts to quantify the
benefits obtained by using smaller bubbles or larger particles in dispersed air
flotation. The limited experimental data obtained so far suggest that the theory
is sound, particularly in its prediction of the effect of bubble size.