This paper investigated the secondary cracking of gasoline and diesel from the catalytic
pyrolysis of Daqing atmospheric residue on catalyst CEP-1 in a fluidized bed reactor. The
results show that the secondary cracking reactivity of gasoline and diesel is poor, and the
yield of total light olefins is only about 10% (by mass). As reaction temperature
increases, ethylene yield increases, butylene yield decreases, and propylene yield shows a
maximum. The optimal reaction temperature is about 670℃ for the production of light
olefins. With the enhancement of catalyst-to-oil mass ratio and steam-to-oil mass ratio,
the yields of light olefins increase to some extent. About 6.30% of the mass of total
aromatic rings is converted by secondary cracking, indicating that aromatic hydrocarbons
are not easy to undergo ring-opening reactions under the present experimental conditions.

The vaporization ratios of the slurry at various temperature and partial pressure were
calculated with the group-contribution method, and then the phase state of the slurry in
the residue fluid catalytic cracking (RFCC) disengager was determined. This research could
provide some advices on how to select the technological conditions to decrease the coking
in the RFCC disengager. The oil gas temperature and the slurry partial pressure had
signifi-cant effects on the vaporization ratio of the slurry. Increasing the oil gas
temperature and reducing the slurry partial pressure could effectively slow down the coking
speed in the RFCC disengager. According to the calculation results, a correlation was
established to predict the vaporization ratio of the slurry under different operating
conditions.

In this paper, shorter residence time (a few minutes) with high yield in the trickle bed
process for peracetic acid synthesis by acetaldehyde liquid phase oxidation can be realized
on the selected packing material SA-5118. For acetaldehyde in acetone with ferric ion as
catalyst, the optimized process conditions were presented. The main factors influencing the
yield, selectivity and conversion are residence time, temperature and acetaldehyde
concentration, respectively. The temperature range checked is from 30 to 65℃. High yield
of 81.53% with high se-lectivity of 91.84% can be obtained at higher temperature of 55℃
when the residence time is 5.5min and the acet-aldehyde concentration is 9.85% (by mass).
And there is a critical acetaldehyde concentration point (Cccp) between 18% and 19.5% (by
mass). At temperature less than 55℃, the highest yield to peracetic acid at each
temperature level increases with temperature when the acetaldehyde concentration is below
Cccp and decreases with temperature when the acetaldehyde concentration is above Cccp.

A new kinetic model for commercial unit of toluene disproportionation and C9-armatiocs
transalkylation is developed based on the reported reaction scheme. A time based catalyst
deactivation function taking weight hourly space velocity (WHSV) into account is
incorporated into the model, which reasonably accounts for the loss in activity because of
coke deposition on the surface of catalyst during long-term operation. The kinetic
parameters are benchmarked with several sets of balanced plant data and estimated by the
differential variable metric optimization method. Sets of plant data at different operating
conditions are applied to make sure validation of the model and the results show a good
agreement between the model predictions and plant observations. The simulation analysis of
key variables such as temperature and WHSV affecting process performance is discussed in
detail, giving the guidance to select suitable operating conditions.

The shear-induced migration of neutrally-buoyant non-colloidal circular particles in a two
-dimensional circular Couette flow is investigated numerically with a distributed Lagrange
multiplier based fictitious domain method. The effects of inertia and volume fraction on
the particle migration are examined. The results indicate that inertia has a negative
effect on the particle migration. In consistence with the experimental observations, the
rapid migration of particles near the inner cylinder at the early stage is observed in the
simulation, which is believed to be related to the chain-like clustering of particles. The
migration of circular particles in a plane Poiseuille flow is also examined in order to
further confirm the effect of such clustering on the particle migration at early stage.
There is tendency for the particles in the vicinity of outer cylinder in the Couette device
to pack into concentric rings at late stage in case of high particle concentration.

A new method for the voidage measurement of gas-oil two-phase flow was proposed. The
voidage measurement was implemented by the identification of flow pattern and a flow
pattern specific voidage measurement model. The flow pattern identification was achieved by
combining the fuzzy pattern recognition technique and the crude cross-sectional image
reconstructed by the simple back projection algorithm. The genetic algorithm and the
partial least square method were applied to develop the voidage measurement models.
Experimental results show that the proposed method is effective. It can overcome the
influence of flow pattern on the voidage measurement, and also has the advantages of
simplicity and speediness.

To develop a new technique for separating gas mixtures via hydrate formation, a set of
medium-sized experimental bubble column reactor equipment was constructed. On the basis of
the structure parameters of the experimental bubble column reactor, assuming that the
liquid phase was in the axial dispersion regime and the gas phase was in the plug flow
regime, in the presence of hydrate promoter tetrahydrofuran (THF), the rate of hydrogen
enrichment for CH4+H2 gas mixtures at different operational conditions (such as
temperature, pressure, concentration of gas components, gas flow rate, liquid flow rate)
were simulated. The heat product of the hydrate reaction and its axial distribution under
different operational conditions were also calculated. The results would be helpful not
only to setting and optimizing operation conditions and design of multi-refrigeration
equipment, but also to hydrate separation technique industrialization.

Constrained spectral non-negative matrix factorization (NMF) analysis of perturbed
oscillatory process control loop variable data is performed for the isolation of multiple
plant-wide oscillatory sources. The technique is described and demonstrated by analyzing
data from both simulated and real plant data of a chemical process plant. Results show that
the proposed approach can map multiple oscillatory sources onto the most appropriate
control loops, and has superior performance in terms of reconstruction accuracy and
intuitive understanding compared with spectral independent component analysis (ICA).

A strategy for water and wastewater minimization is developed for continuous water
utilization systems involving fixed flowrate (non-mass-transfer-based) operations, based on
the fictitious operations that is introduced to represent the water losing and/or
generating operations and a modified concentration interval analysis (MCIA) technique. This
strategy is a simple, nongraphical, and noniterative procedure and is suitable for the
quick yields of targets and the identification of pinch point location. Moreover, on the
basis of the target method, a heuristic-based approach is also presented to generate water
utilization networks, which could be demonstrated to be optimum ones. The proposed
approaches are illustrated with example problems.

The first part of the series of this article proposed a systematic method for the synthesis
of continuous water-using system involving both non-mass-transfer-based and mass-transfer-
based operations. This article, by extending the method, proposes a time-dependent
concentration interval analysis (CIA) method to solve the problems associated with the
synthesis of discontinuous or batch water-using systems involving both non-mass-transfer-
based and mass-transfer-based operation. This method can effectively identify the
possibility of water reuse and the amount of water reused under time constraints for
minimizing the consumption of freshwater in single or repeated batch/discontinuous water-
using systems. Moreover, on the basis of the heuristic method adapted from concentra-tion
interval analysis method for the continuous process network design, the network design for
the discontinuous or batch process can be obtained through the designs for every time
interval. Case study illustrates that the method presented in this article can
simultaneously minimize the freshwater consumption in single or repeated
batch/discontinuous water system and can determine a preferable storage tank capacity for
some problems.

Four ZSM-5 zeolite catalysts with different Si/Al ratios for the catalytic cracking of C4
fractions to produce ethylene and propylene were prepared in this study. First, the
adsorption isotherms of pure n-butane and butene-1 and their mixtures on these catalysts at
300K and p＝0—100kPa were measured using the intelligent gravimetric analyzer. The
experimental results indicate that the presence of Al can significantly affect the
adsorption of butene-1 than that of n-butane on ZSM-5 zeolites. Then, the double Langmuir
(DL) model was applied to study the pure gas adsorption on ZSM-5 zeolites for pure n-butane
and butene-1. By combining the DL model with the ideal adsorbed solution theory (IAST), the
IAST-DL model was applied to model the butene-1 (1)/n-butane (2) binary mixture adsorption
on ZSM-5 zeolites with different Si/Al ratios. The calculated results are in good agreement
with the experimental data, indicating that the IAST-DL model is effective for the present
systems. Finally, the adsorption over a wide range of variables was predicted at low
pressure and 300K by the model proposed. It is found that the selectivity of butene-1 over
n-butane increases linearly with the decrease of Si/Al ratio. A correlation between the
selectivity and Si/Al ratio of the sample was proposed at 300K and p=0.08MPa.

The ability of catalyzing indole into indigo of gene engineering strain expressing P450 BM3
immobilized by entrapment in calcium-alginate gel capsules was examined, and various
characteristics of immobilized cells were assessed. Optimum conditions for cells activity
were not affected after immobilization, and pH and temperature for both free and
immobilized cells were found to be pH 7.5 and 35℃, respectively. The immobilized cells
exhibited a markedly improved thermal stability than free cells. After five repeated
experiments, the yield of indigo with the immobilized cells retained over 94% of their
original activity, which indicated that the operational stability for recycling in batch
processes was improved.

A series of polyhydroxyalkanoate (PHA) copolymers consisting of short-chain-length (SCL)
and medium-chain-length (MCL) 3-hydroxyalkanoate (3HA) monomers were synthesized in the
recombinant Ralstonia eutropha PHB－4 harboring a low-substrate-specificity PHA synthase
PhaC2Ps from Pseudomonas stutzeri 1317. These polyesters, whose monomer compositions varied
widely in chain length, were purified and characterized by acetone fractionation, nuclear
magnetic resonance (NMR), gel-permeation chromatography (GPC), and differential scanning
calorimetry (DSC). This was the first time that the physical properties of PHA copolymers
polymerized by PhaC2Ps were characterized. The results indicated that the variation in MCL
3HA contents did not have an obvious influence on the molecular weights of these PHA
copolymers but was effective in changing their physical properties. The variation in the
thermal property of PHA copolymers with 3-hydroxyoctanoate (3HO) content was also inves-
tigated in this study.

Electroporation creates aqueous pathways by short high-voltage pulses resulting in a
transient permeabilization of stratum corneum and an increase in the transdermal delivery
rate. However the aqueous pathways will reseal after pulsing, which leads to the rapid drop
of transdermal flux. In the present study, the surfactants were added to the donor solution
to hinder the shrinkage and resealing of the electropore, and to prolong the lifetime of
the aqueous pathways with the consideration that the surfactants could reduce the surface
energy of the electropore. These effects of surfactants were demonstrated by the dynamic
electrical resistance of the skin and the fluorescent imaging of the local transport
regions. Piroxicam (PIX) was transported percutaneously in the presence of surfactants in
vitro. Owing to the longer lifetime of aqueous pathways, together with the promotion of PIX
availability at the barrier exterior and the improvement in the partition of PIX into the
aqueous pathways, the presence of surfactants led to a remarkable increase in the
transdermal delivery rate during electroporation and a significant growth of the
accumulative transdermal amount of PIX.

The effects of nitrogen sources on streptolydigin production and distribution of secondary
metabolites were investigated for flask cultured S. lydicus AS 4.2501. When peptone,
asparamide, and glutamic acid were examined as the nitrogen source, respectively, liquid
chromatography-mass spectrometry (LC-MS) and photodiode array (PDA) analyses revealed the
formation of two analogues of streptolydigin in the fermentation broth. When soybean meal
was used as the source of nitrogen, three analogues of streptolydigin were detected. The
use of ammonium sulfate as a source of nitrogen resulted in a lower pH value of the
fermentation system, thus inhibiting streptolydigin biosynthesis and changing the metabolic
profiling. Among the nitrogen sources that were made use of, glutamic acid was most
favorable to the formation of streptolydigin. Simultaneously, this study also showed that
the changing nitrogen sources resulted in altering the production and relative ratios of
streptolydigin and its analogues.

In this article, a steady-state mathematical model was developed and experimentally
evaluated to investigate the effect of influent flow distribution and volume ratios of
anoxic and aerobic zones in each stage on the total nitrogen concentration of the effluent
in the step-feed biological nitrogen removal process. Unlike the previous modeling methods,
this model can be used to calculate the removal rates of ammonia and nitrate in each stage
and thereby predict the concentrations of ammonia, nitrate, and total nitrogen in the
effluent. To verify the simulation results, pilot-scale experimental studies were carried
out in a four-stage step feed process. Good correlations were achieved between the measured
data and the simulation results, which proved the validity of the developed model. The
sensitivity of the model predictions was analyzed. After verification of the validity, the
step feed process was optimally operated for five months using the model and the criteria
developed for the design and operation. During the pilot-scale experimental period, the
effluent total nitrogen concentrations were all below 5mg•L－1, with more than 90% removal
efficiency.

A novel epoxidized soybean oil-toughened-phenolic resin (ESO-T-PR) has been synthesized by
etherification graft and multi-amine curing ESO. Fourier transform infrared spectroscopy
(FTIR) was adopted to investigate its molecular structure and scan electron microscope
(SEM) was used to observe the micro morphology of its impact fracture surface. This ESO-T-
PR was adopted as the matrix resin to prepare paper copper clad laminate (P-CCL) and the
properties of resulting P-CCL are found superior to the related Chinese National Standard.
The toughing mechanism was investigated by comparing the impact strength, solderleaching
resistance, flexural strength, peeling strength and morphology of this ESO-T-PR with those
of other two ESO modified phenolic resins. It is demonstrated that during the synthesizing
process of ESO-T-PR, the phenol hydroxyl is etherified by ESO or ESO epoxy resin prepolymer
(ESO chain extension polymer) and the long ESO epoxy resin chain segments enhance the
crosslink density of ESO-T-PR and consequently improve the impact toughness and
solderleaching resistance of P-CCL made of ESO-T-PR. The ESO-T-PR is a cheap matrix resin
with excellent properties to make P-CCL (elec-tric guide board).

Cooling-solidification of sprayed droplets is one of major methods for prilling of melt.
Traditionally, this is carried out in an empty tower, and the equipment requirement for
producing larger particles is very high, resulting in not only significant cost increasing
but also difficulties in transporting melt etc. Based on analysis and simulation, a new
prilling process is developed for the melt prilling, which combines a tower with a
fluidized bed so that the height of equipment is greatly decreased, and it exhibits
satisfactory performance in industrial application. Mathematical model for tower prilling,
its simulated results, the structure of the equipment for the innovated prill-ing process
and its application are addressed.

Microcapsulated chlorocyclophosphazenes were synthesized, and then microcapsulated
chlorocyclo-phosphazene/polypropylene(PP) composites were prepared. The results showed that
microcapsulated chlorocyclo-phosphazene had good high thermal stability through
thermogravimetric analysis (TGA). The flammability and mechanical properties of
microcapsulated chlorocyclophosphazene/polypropylene composites were investigated by
limiting oxygen index experiment, UL 94V flame retardancy test, cone calorimetry, tensile
experiment, and impact test, respectively. It was shown that the microcapsulated
chlorocyclophosphazene/PP composites had better tensile strength, impact strength, flame
retardant properties and smoke suppress properties compared with chlorocyclo-phosphazene/PP
composites.

The immersion corrosion of archaeological iron in solution (0.06mol•L－1 NaCl+0.03mol•L－1
Na2SO4+ 0.01mol•L－1 NaHCO3) simulating soil water composition was presented. The evolution
of archaeological iron from iron to iron oxide and to iron oxy-hydroxides compounds was
investigated by scanning electron microscope (SEM) and X-ray diffraction (XRD) analysis.
According to the morphology, phase composition, and transformation process, the
contributions of each corrosion product to archaeological iron were discussed.

To study the feasibility of CO2 geological sequestration, it is needed to understand the
complicated multiple-phase equilibrium and the densities of aqueous solution with CO2 and
multi-ions under wide geological conditions (273.15—473.15K, 0—60MPa), which are also
essential for designing separation equipments in chemical or oil-related industries. For
this purpose, studies on the relevant phase equilibria and densities are reviewed and ana-
lyzed and the method to improve or modify the existing model is suggested in order to
obtain more reliable pre-dictions in a wide temperature and pressure range. Besides, three
different models (the electrolyte non random two-liquid (ELECNRTL), the electrolyte NRTL
combining with Helgeson model (ENRTL-HG), Pitzer activity co-efficient model combining with
Helgeson model (PITZ-HG)) are used to calculate the vapor-liquid phase equilib-rium of CO2
-H2O and CO2-H2O-NaCl systems. For CO2-H2O system, the calculation results agree with the
experi-mental data very well at low and medium pressure (0—20MPa), but there are great
discrepancies above 20MPa. For the water content at 473.15K, the calculated results agree
with the experimental data quite well. For the CO2-H2O-NaCl system, the PITZ-HG model show
better results than ELECNRTL and ENRTL-HG models at the NaCl concentration of 0.52mol•L－1.
Bur for the NaCl concentration of 3.997mol•L－1, using the ELECNRTL and ENRTL-HG models
gives better results than using the PITZ-HG model. It is shown that available experimental
data and the thermodynamic calculations can satisfy the needs of the calculation of the
sequestration capacity in the temperature and pressure range for disposal of CO2 in deep
saline aquifers. More experimental data and more accu-rate thermodynamic calculations are
needed in high temperature and pressure ranges (above 398.15K and 31.5MPa).

Using a laser observation technique, the solubilities of trans-1,2-cyclohexanediol in butyl
acetate + water were measured at the temperature range from 298.15K to 323.15K by a
synthetic method at atmospheric pressure. It is shown that the solubilities of trans-1,2-
cyclohexanediol in butyl acetate + water were affected greatly by the proportion of butyl
acetate and water, and presented maximum value at given temperature. The UNIFAC model was
used to correlate the experimental data. The average relative deviation (ARD) between
experimental and cal-culated values is 3.03%.

Catalytic activities of a series of metalloporphyrin complexes in selective aerobic
oxidation of toluene were investigated. The effects of different central metal ions in
metalloporphyrins [T(p-Cl)PPMCl (M=Fe,Co,Mn,Cu)] on the reaction course had been examined
and it was found that T(p-Cl)PPCu presented the highest catalytic activity in the reaction.
The reaction conditions of toluene oxidation were optimized by using orthogonal experiment
design. Five relevant factors were investigated: temperature, air pressure, catalyst
loading, air flow rate and reaction time. The effects of the five factors on both toluene
conversion and total yield of benzaldehyde and benzyl alcohol were discussed. The research
results showed that the reaction temperature was the most significant factor influencing
toluene oxidation. On the basis of the margin analysis, the optimum conditions for the
toluene conversion and the total yield of benzaldehyde and benzyl alcohol respectively were
achieved, under which the toluene conversion was up to 14.67% and the total yield of
benzaldehyde and benzyl alcohol reached 5.89%.

Polyaspartic acid (PASP) is suitable for the inhibition of scale deposition from water. To
enhance its inhibition efficiency, PASP was modified by reacting aspartic acid (Asp) with
glutamic acid (Glu) to provide Asp-Glu copolymer under microwave irradiation. The influence
of reaction parameters on conversion, molecular weight and inhibition of CaCO3
precipitation was investigated Infra-red. (IR), 1H nuclear magnetic resonance (1H NMR) and
13C nuclear magnetic resonance (13C NMR) spectroscopies were used to characterize the
copolymer. The results show that copolymerization of aspartic acid and glutamic acid is
catalyzed by a small amount of phosphorous acid (H3PO4) in solvent, the product conversion
is 98.05% under the following conditions: the molar ratio of glutamic acid to reactant
[Glu/(Asp＋Glu)] is 0.3 and that of catalyst (Cat) to reactant [Cat/(Glu+Asp)] is 0.05
(0.65ml H3PO4), the volume of solvent dimethylformamide is 16ml, the microwave power used
is 720W and the reaction for 3 min. The weight average molecular weight of copolymer
synthesized under these conditions is 2709 and the inhi-bition rate for CaCO3 is 97.75%.