Q.L. Chen

article

Optimization of Feed Locations for Double-feed Columns Based on the Column Grand Composite Curve

X.G. Liu, C. He, C.C. He, B.J. Zhang, more

Energy Procedia > 2017 > 105 > C > 5172-5179

In this work, a novel graphical method is presented to quantitatively identify the optimal feed stage locations of double-feed columns on the basis of the column grand composite curve (CGCC). A double-feed column can be composed of two simple single-feed columns under minimum thermodynamic conditions according to previous research. Then, two material and enthalpy balance envelopes are regulated according...

article

Optimal Design of a New Aromatic Extractive Distillation Process Aided by a Co-solvent Mixture

Q. Wang, B.J. Zhang, C. He, C.C. He, more

Energy Procedia > 2017 > 105 > C > 4927-4934

Sulfolane Extractive Distillation (ED) processes are widely used for benzene, toluene and xylenes (BTX) separation. Based on the phase equilibrium data and NRTL property method, this paper develops an ED process aided by a co-solvent mixture of sulfolane, N-methyl-2-pyrrolidinone (NMP) and water to improve the recovery of aromatics and reduce the minimum hot utility requirement (H_t,min). Firstly,...

article

Expression of the interleukin-21 and phosphorylated extracellular signal regulated kinase 1/2 in Kimura disease

Q.L. Chen, Z. Gong, C. Li, B. Shao, more

International Journal of Oral and Maxillofacial Surgery > 2017 > 46 > S1 > 141-142

article

A new retrofit approach to the absorption-stabilization process for improving energy efficiency in refineries

X.G. Liu, C. He, C.C. He, J.J. Chen, more

Energy > 2017 > 118 > C > 1131-1145

In a refining complex, an absorption-stabilization process used in the production of end-use petro-products (i.e. stable gasoline and liquefied petroleum gas) is energy-intensive and costly. A new absorption-stabilization process with a two-stage condensation section is introduced in this work to further improve energy-use performance. In the new process, a condenser, a condensed oil tank, and a side-reboiler...

article

Simultaneous design of heat exchanger network for heat integration using hot direct discharges/feeds between process plants

B.J. Zhang, J. Li, Z.L. Zhang, K. Wang, more

Energy > 2016 > 109 > C > 400-411

A chemical or petrochemical site is generally made up of several plants that are linked together through process streams. The linking process streams are often cooled down in their source plants, then transferred into storage tanks, and reheated in destination plants. This repeatedly cooling and heating results in low energy-use efficiency and more area installed in heat exchanger network. In this...

article

A new double flash process and heat integration for better energy utilization of toluene disproportionation

K. Liu, B.J. Zhang, Z.L. Zhang, Q.L. Chen

Energy > 2015 > 89 > C > 168-177

When a chemical complex has similar demands for both benzene and xylenes, toluene disproportionation is an attractive process to produce both benzene and p-xylene. Nevertheless, the conventional production process is heavily energy intensive with low economic benefits. In the conventional process, the high temperature reaction effluent of 458 °C is cooled to 36 °C for hydrogen separation. The flash...

article

A New Adsorption Process to Intensify Liquefied Petroleum Gas Recovery from Raw Natural Gas

K. Liu, B.J. Zhang, Q.L. Chen

Energy Procedia > 2015 > 75 > Complete > 853-859

Raw natural gas from gas wells typically consists of methane, gaseous hydrocarbons, acid gases, water, liquid hydrocarbons, etc. The raw natural gas must be purified to produce the pipeline quality dry natural gas for residential, commercial and industrial consumers. The existing natural gas processing often roughly separates the raw natural gas into gaseous phase dry natural gas and liquid-phase...

article

A multi-period mathematical model for simultaneous optimization of materials and energy on the refining site scale

B.J. Zhang, K. Liu, X.L. Luo, Q.L. Chen, more

Applied Energy > 2015 > 143 > C > 238-250

A process system is designed for material transformations that produce certain functional chemicals while usually consuming large amounts of energy. Materials in process systems have long been the major focus of investigation to achieve better economic performance. Rising energy prices and stricter limitations on greenhouse gas emissions have also led to greater attention on energy savings. The configuration...

article

Rumination mediates the relationship between structural variations in ventrolateral prefrontal cortex and sensitivity to negative life events

L. Qiao, D.T. Wei, W.F. Li, Q.L. Chen, more

Neuroscience > 2013 > 255 > Complete > 255-264

Individuals have different levels of stress sensitivity. An individual’s predisposition to experience negative life events (NLEs) may make him/her more vulnerable to a series of psychopathological and physical diseases. However, the neuroanatomical correlates of individual differences in sensitivity to NLEs remain unknown. In this study, voxel-based morphometry was used to identify the gray matter...

article

A reactive distillation process with a sidedraw stream to enhance the production of isopropyl acetate

B.J. Zhang, W.S. Yang, S. Hu, Y.Z. Liang, more

Chemical Engineering & Processing: Process Intensification > 2013 > 70 > Complete > 117-130

This paper designs an entrainer combined with a sidedraw to enhance the reactive distillation (RD) process of isopropyl acetate (IPAc). Acetic acid (HAc) reacts with isopropanol (IPOH) to generate IPAc and water (H ₂ O). The ratio of IPAc to H ₂ O in the products of esterification is smaller than that in the minimum boiling IPAc–IPOH–H ₂ O azeotrope, resulting in a mass of...

article

A hydraulics-based heuristic strategy for capacity expansion retrofit of distillation systems and an industrial application on a light-ends separation plant

Z.Q. Wei, B.J. Zhang, S.Y. Wu, Q.L. Chen, more

Chemical Engineering Research and Design > 2012 > 90 > 10 > 1527-1539

A new indicator to represent a maximum capacity expansion rate of distillation processes is presented in this article. A hydraulics-based heuristic strategy consisting of three levels is proposed to address the capacity expansion retrofit redesign of distillation systems. The first level is to evaluate an existing process to get the indicator which reflects quantitatively the capacity expansion rate,...

article

An integrated lab-on-a-disc for automated cell-based allergen screening bioassays

Q.L. Chen, K.L. Cheung, S.K. Kong, J.Q. Zhou, more

Talanta > 2012 > 97 > Complete > 48-54

We have utilized various valving scheme to leverage purely rotation-regulated flow control to enable comprehensive cell-based bioassays (CBBs) on centrifuge-based lab-on-a-disc (LOAD). A LOAD has been developed to examine allergic degranulation from live basophils for allergens screening for the first time, which can also be adjusted to suit a wide range of CBBs. In this system, controlled allergic...

article

Simultaneous optimization of energy and materials based on heat exchanger network simulation for diesel hydrotreating units

B.J. Zhang, Q.L. Chen, S. Hu, W.G. Gu, more

Chemical Engineering Research and Design > 2010 > 88 > 5-6 > 513-519

A multi-period nonlinear programming (NLP) formulation is presented in this paper. This is intended to optimize energy and materials simultaneously for diesel hydrotreating units in order to minimize the total costs which include product income, material cost, energy cost, and other fixed operating costs. The heat exchanger network (HEN) is integrated into the model to address the energy consumption...

article

First principles study on the electronic structure and effect of vanadium doping of BN nanowires

K.H. He, G. Zheng, B. Kirtman, Q.L. Chen, more

Solid State Communications > 2010 > 150 > 15-16 > 701-706

The electronic structure and effect of vanadium doping of BN nanowires are studied by first principles calculations. For the pure nanowires, it can be found that B atoms move inwards whereas N atoms move outwards, and BN nanowires have a constant band gap about 4.08 eV with larger diameter. The above-mentioned features are in agreement with those of BN nanotubes. We also find that the pure nanowires...

chapter

An Algorithm of Tool-Path Optimization for High-Speed Machining Deep-Cavity Precision Forging Die

Q.P. Sun, Q.L. Chen, Q.F. Wang, W.H. Liao

2009 International Conference on Artificial Intelligence and Computational Intelligence > 4 > 397 - 401

2009 International Conference on Artificial Intelligence and Computational Intelligence (AICI 2009)

Aiming at the difficulty of maintaining the contour precision of forging die with deep pocket, an optimization algorithm of tool-path generation for high speed machining (abbr. HSM) forging die with deep cavity is proposed in this paper. In terms of measuring errors of pocketing die, a mathematical model correlation to the length of a tool-path, the available length of a cutting tool and the profile...

chapter

Design and fabrication of centrifugal microfluidic disk for allergic response monitoring

Q.L. Chen, H.P. Ho, Y.K. Suen, S.K. Kong, more

2009 14th OptoElectronics and Communications Conference > 1 - 2

2009 35th European Conference on Optical Communication (ECOC)

We here report the design and fabrication of a centrifugal microfluidic disk for allergic response monitoring. Several functional valves are incorporated for controlling fluid flow in the microfluidic network.

article

Real-time protein biosensor arrays based on surface plasmon resonance differential phase imaging

C.L. Wong, H.P. Ho, Y.K. Suen, S.K. Kong, more

Biosensors and Bioelectronics > 2008 > 24 > 4 > 606-612

This paper reports the application of differential phase surface plasmon resonance (SPR) imaging in two-dimensional (2D) protein biosensor arrays. Our phase imaging approach offers a distinct advantage over the conventional angular SPR technique in terms of utilization efficiency of optical sensor elements in the imaging device. In the angular approach, each biosensor site in the biosensor array requires...

article

Influence of ion energies on the surface morphology of carbon films

L.H. Li, J.Z. Tian, X. Cai, Q.L. Chen, more

Surface & Coatings Technology > 2005 > 196 > 1-3 > 241-245

Diamond-like carbon (DLC) films were deposited using vacuum arc deposition (VAD) and plasma immersion ion implantation and deposition (PIII and D). The surface morphologies of these films were investigated using atom force microscopy (AFM). Raman spectroscopy results show that the films have different microstructures. Based on the AFM images and Raman spectra, the aromatic ring cluster diameters hardly...

article

A phenomenological equation of exergy transfer and its application

S.P. Wang, Q.L. Chen, Q.H. Yin, B. Hua

Energy > 2005 > 30 > 1 > 85-95

A phenomenological equation of exergy transfer, which indicates the relation between exergy flux, exergy resistance and exergy driving forces, is derived by applying non-equilibrium thermodynamics to second law analysis, and simultaneously the expressions of the coefficients of exergy transfer are obtained. The results show that exergy transfers in different forms interact on each other. This study...

article

Energy-use analysis and improvement for delayed coking units

Q.L. Chen, Q.H. Yin, S.P. Wang, B. Hua

Energy > 2004 > 29 > 12-15 > 2225-2237

This paper presents the energy and exergy analyses for a delayed coking unit in a Chinese refinery using the three-link energy structural model. According to the results of energy-use analysis and evaluation, the potentials of energy-use and improvements for energy-savings as well as detail procedures are suggested. The proposed improvements are expected to remarkably lower the energy consumption...

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Search results for: Q.L. Chen

Optimization of Feed Locations for Double-feed Columns Based on the Column Grand Composite Curve

Optimal Design of a New Aromatic Extractive Distillation Process Aided by a Co-solvent Mixture

Expression of the interleukin-21 and phosphorylated extracellular signal regulated kinase 1/2 in Kimura disease

A new retrofit approach to the absorption-stabilization process for improving energy efficiency in refineries

Simultaneous design of heat exchanger network for heat integration using hot direct discharges/feeds between process plants

A new double flash process and heat integration for better energy utilization of toluene disproportionation

A New Adsorption Process to Intensify Liquefied Petroleum Gas Recovery from Raw Natural Gas

A multi-period mathematical model for simultaneous optimization of materials and energy on the refining site scale

Rumination mediates the relationship between structural variations in ventrolateral prefrontal cortex and sensitivity to negative life events

A reactive distillation process with a sidedraw stream to enhance the production of isopropyl acetate

A hydraulics-based heuristic strategy for capacity expansion retrofit of distillation systems and an industrial application on a light-ends separation plant

An integrated lab-on-a-disc for automated cell-based allergen screening bioassays

Simultaneous optimization of energy and materials based on heat exchanger network simulation for diesel hydrotreating units

First principles study on the electronic structure and effect of vanadium doping of BN nanowires

An Algorithm of Tool-Path Optimization for High-Speed Machining Deep-Cavity Precision Forging Die

Design and fabrication of centrifugal microfluidic disk for allergic response monitoring

Real-time protein biosensor arrays based on surface plasmon resonance differential phase imaging

Influence of ion energies on the surface morphology of carbon films

A phenomenological equation of exergy transfer and its application

Energy-use analysis and improvement for delayed coking units

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