Liaoning Oxiranchem Group

Liaoyang, China

Liaoning Oxiranchem Group

Liaoyang, China
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An W.,Ocean University of China | Meng X.,Ocean University of China | Li H.,Ocean University of China | Zhou L.,Liaoning Oxiranchem Group | Zhu J.,Liaoning Oxiranchem Group
Huagong Xuebao/CIESC Journal | Year: 2012

The utilization of heat of reaction and energy optimization within ethoxylation reactive distillation(ERD)column, which involves reactions with highly thermal effect, was studied by using the mathematical model and simulation method. A typical ethoxylation system, the synthesis of ethylene glycol monobutyl ether(EGMBE)from ethylene oxide(EO)and n-butanol was employed as example. Firstly, the conventional column design, into which a reactive section was superimposed onto a stripping section, was used as a base case for analysis, and detailed simulations were carried out to investigate the influence of heat of reaction on the process performance. The results obtained showed that, by the adoption of the conventional design of ERD column, the heat of reaction was finally removed from condenser by cooling medium, i. e., the heat of reaction could not be directly utilized in ERD column for improving the separation operation or reducing the heat duty of reboiler. Based on this, the approaches to utilizing heat of reaction was analyzed, and an internally heat-integrated ethoxylation reactive distillation structure, IHIERD, was proposed to maximize the energy efficiency of system, into which the reactive section and stripping section was partitioned into two parts with different operating pressures. In such arrangement, the heat of reaction can be allowed as heat resource to be drawn from reactive section to supply stripping section, and therefore the heat duty of reboiler in IHIERD can be reduced. The saving effectiveness of different designs was analyzed and compared by using simulations. The results obtained demonstrated that the IHIERD leads to a reduction of the reboiler temperature from 462.5 K to 420.0 K, a reduction of the heat duties of condenser and the total energy input by 11% and 14%, respectively, which indicated that the energy saving was obvious. © All Rights Reserved.


An W.,Ocean University of China | Jiang J.,Ocean University of China | Lin Z.,Ocean University of China | Bie H.,Ocean University of China | Zhu J.,Liaoning Oxiranchem Group
Huaxue Fanying Gongcheng Yu Gongyi/Chemical Reaction Engineering and Technology | Year: 2016

In order to develop the new model and experimental research of ethoxylation process, a pilot-scale three-section tubular reactors was proposed and built for the synthesis of ethylene glycol monoethyl ether (EGMEE) from ethylene oxide (EO) and ethanol. Aspen Plus software platform was used to carry out the simulation of the process. The key operation parameters including EO feed location, feed flow rate, molar feed ratio of ethanol to EO and ways of heat exchange were examined to investigate their effects on EO conversion, the selectivity of EGMEE and hot point temperature so as to obtain the optimum operation mode and operation parameters. The simulation results showed that there exists a complex trade-off between reaction and heat transfer in tubular reactors. The profile of EO concentration along the tube was the key factor to EO conversion, selectivity of EGMEE, reaction heat removal and process safety. Using multistage charge of EO and multistage cooling were important means to improve the stability and safety of the addressed reactor process. © 2016, Editorial Board of Journal of Chemical Reaction Engineering and Technology. All right reserved.


An W.,Ocean University of China | Lin Z.,Ocean University of China | Jiang Y.,Ocean University of China | Chen F.,Ocean University of China | And 2 more authors.
Huagong Xuebao/CIESC Journal | Year: 2013

The problem to seek further heat integration for the hydration of ethylene oxide by reactive distillation(RD) to produce ethylene glycol, which involves reactions with highly thermal effect, was investigated. An innovative process, internally heat-integrated RD column(R-HIDiC), was proposed to maximize energy efficiency of the system, in which the reactive section and stripping section was partitioned into two parts with different operating pressures so that the internal heat transfer between reactive section and stripping section was allowed. Steady-state simulations based on Aspen Plus software were performed to investigate the feasibility of internal heat integration, and an energy integration design without the need of reboiler was provided by optimizing the heat distribution in R-HIDiC. The results obtained demonstrated that, comparing with the conventional design, the proposed R-HIDiC design did not need a reboiler, thus, the total energy input can be supplied by the heat of reaction of the hydration of ethylene oxide and the electricity power of compressor, which leads to a reduction of the operating and total cost by 47.2% and 39.1%, respectively. © All Rights Reserved.


Li J.,Ocean University of China | An W.,Ocean University of China | Zhang H.,Ocean University of China | Zhou L.,Liaoning Oxiranchem Group | Zhu J.,Liaoning Oxiranchem Group
Huagong Xuebao/CIESC Journal | Year: 2010

The modeling and simulation of semi-batch external loop spray ethoxylation reactor was studied. By analyzing the characteristics of the reactor, a mathematical model and numerical algorithm were developed to describe the behavior of the reactor. The model took the vapor-liquid transfer, kinetics, vapor-liquid equilibrium, variation of reactive volume, as well as the effect of inert gas nitrogen on the reactor into account. Based on the developed model, simulations were performed by taking the production of polyethylene glycol as an example. The simulation results provided the typical dynamic profiles of the reactor temperature, pressure, ethylene oxide concentration, as well as the ethoxylated oligomer distributions. Simulation results were compared with the full-scale plant data, which showed the reliability of the developed mathematical model. © All Rights Reserved.


Lin Z.,Ocean University of China | An W.,Ocean University of China | Yuan L.,Ocean University of China | Cai H.,Ocean University of China | Zhu J.,Liaoning Oxiranchem Group
Huagong Xuebao/CIESC Journal | Year: 2015

To obtain the optimum distribution of liquid holdup or catalyst volume in the reactive zone for the design of a reactive distillation (RD) column considering selectivity targets, a design and optimization framework based on the combination of exergy loss analysis and process simulation were proposed. An exergy calculation model was established, including both physical and chemical exergy values, according to which the causes of exergy loss could be revealed with insights that provided the evolutionary direction of optimization. By linking the reaction volume distribution with exergy loss, the design of a reactive distillation column with the minimum reboiler heat duty could be accomplished by using the proposed optimization methodology. The proposed methodology was validated by the application to a reactive distillation column for producing ethylene glycol (EG) by hydration of ethylene oxide (EO). The optimized reaction volume distribution could reduce total energy consumption by 18%, compared with the commonly used even reaction volume design. In addition, the effect of energy saving obtained in this work was better than that reported in literature. © All Rights Reserved.


An W.-Z.,Ocean University of China | Guo D.,Ocean University of China | Li J.,Ocean University of China | Zhou L.-M.,Liaoning Oxiranchem Group | Zhu J.-M.,Liaoning Oxiranchem Group
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2013

A theoretical method based on UNIFAC group contribution model was proposed for predicting the vapor-liquid equilibria of ethylene oxide (EO)-ployethylene glycols (PEG) systems, aiming at overcoming the difficulty of EO solubility measurement in industrial ethoxylation reactor. The method of group division in EO-PEG systems and the parameters of UNIFAC model were established by taking PEG mixtures with different relative molecular mass as a pseudo-component with an averaged numbers of EO adducts n (EO). On that basis, the vapor-liquid equilibria data of EO-PEG system at different n (EO) ranging from 0 to 40 were obtained through calculations and compared with the experimental results. The results show that EO activity coefficient in liquid phase reduces constantly with the increase of n (EO), which corresponds to the solubility of EO in PEG increased constantly. The analysis of EO solubility change rules in PEG was also carried out, and the result reveals that when n (EO) < 8, the interaction of groups plays a major contribution to the activity coefficients of EO; when n (EO) > 15, the non-ideality of system is resulted from the differences of size and shape of the molecules, which means the effect of the interaction of group on activity coefficient can be negligible.


An W.,Ocean University of China | Lin Z.,Ocean University of China | Chen J.,Ocean University of China | Zhu J.,Liaoning Oxiranchem Group
Industrial and Engineering Chemistry Research | Year: 2014

A novel approach to removing water from near-azeotropic ethanol-water mixtures is proposed based on the hydration of ethylene oxide (EO) to produce ethylene glycol (EG) in a reactive distillation (RD) column. Steady-state simulations using the Aspen Plus software package were carried out to investigate the feasibility of the suggested approach, and a sensitivity analysis was carried out to obtain the optimal design parameters. The results showed that, using the optimal operating conditions, a reactive distillation column is capable of circumventing the azeotropic limitation to obtain anhydrous ethanol. Compared with traditional approaches, the proposed approach is promising because of its great potential for reducing energy consumption and capital costs. © 2014 American Chemical Society.


An W.Z.,Ocean University of China | Meng X.,Ocean University of China | Bi D.W.,Liaoning Oxiranchem Group | Zhu J.M.,Liaoning Oxiranchem Group
Computer Aided Chemical Engineering | Year: 2012

The production of ethylene glycol monobutyl ether (EGMBE) from ethylene oxide (EO) and n-butanol was studied in a catalytic distillation (CD) column using a base catalyst immobilized in a structured packing. A pilot plant CD packed column been built up for experimental investigations and a steady-state mathematical model was developed to investigate the basic laws of the CD column. The results revealed that the CD process offers potential advantages for EGMBE production, and a 99% conversion of EO and 91% selectivity of EGMBE could be achieved simultaneously that was otherwise not possible with the traditional reactors. © 2012 Elsevier B.V.


Lin Z.,Ocean University of China | An W.,Ocean University of China | Xu Y.,Ocean University of China | Zhu J.,Liaoning Oxiranchem Group
Computer Aided Chemical Engineering | Year: 2015

This work introduces an efficient approach to the conceptual design of an internally heat-integrated reactive distillation column (HIRDiC) synthesizing ethylene glycol (EG) through the hydration of ethylene oxide (EO). A systematic method is proposed to obtain a feasible physical configuration with maximum possible extent of heat integration, in which the column diameter, the number of panels and the panel size on each plate are iteratively examined and determined according to thermodynamic and hydraulic analysis. Evaluated by the total annualized capital cost (TAC), the comparison results showed that neither of the two commonly used heat distribution schemes, i.e. uniform heat transfer area and uniform heat duty distribution, was as good as the design acquired from the proposed methodology. © 2015 Elsevier B.V.

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