Carlos Daniel Fischer

Consejo Nacional de Investigaciones Científicas y Técnicas

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Oscar A. Iribarren

Consejo Nacional de Investigaciones Científicas y Técnicas

Daniela S. Laoretani

Consejo Nacional de Investigaciones Científicas y Técnicas

André L.H. Costa

Universidade do Estado do Rio de Janeiro

Miguel J. Bagajewicz

University of Oklahoma

Miguel C. Mussati

National University of Avellaneda

Tatiana Morosuk

Technische Universität Berlin

Sergio F. Mussati

National University of Avellaneda

Daniela Soledad Laoretani

Consejo Nacional de Investigaciones Científicas y Técnicas

Cooperative Institutions

Consejo Nacional de Investigaciones Científicas y Técnicas

Instituto de Desarrollo Tecnológico para la Industria Química

National University of Avellaneda

National Technological University

Centro Científico Tecnológico - Santa Fe

Universidad Tecnológica Nicaragüense

National University of Rosario

Universidade do Estado do Rio de Janeiro

Universidade Federal do Rio de Janeiro

Centro Científico Tecnológico - Tucumán

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MILP APPROACH FOR THE DESIGN OF VERTICAL VAPOR-LIQUID SEPARATION VESSELS- COMPARISON WITH HEURISTICS

Latin American Applied Research - An international journal (2020)

Carlos Daniel Fischer André L.H. Costa Miguel J. Bagajewicz

In this article we compare results from different heuristics approaches for the design of VLE separation vessels. In addition, we present an MILP model that embeds the aforementioned heuristics and considers the discrete nature of the geometric variables. We show that different heuristics render different results. In addition, while results from heuristics and MILP often coincide sometime, departures take place. Finally, we show that straight enumeration is viable option for stand-alone design.

Heuristics

Enumeration

10.52292/j.laar.2020.204

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Citations (1)

Improvements in the Design of the Ammonia Synthesis Process Implementing Counter Current Gas Permeation Modules

Industrial & Engineering Chemistry Research (2012)

Carlos Daniel Fischer Oscar A. Iribarren

This paper explores mass exchanging the outlet and inlet streams of the reactor, following a design heuristic proposed by Fischer and Iribarren in Industrial and Engineering Chemistry Research2011, 50 (11), 6849–6859 within the Hierarchical Process Design Procedure by J. M. Douglas in Conceptual Design of Chemical Processes, McGraw-Hill, 1988. When applied to the ammonia synthesis process, this design methodology generated a process alternative different from that previously proposed by other authors, resorting to ceramic membrane counter current gas permeation units to perform the mass exchange of hydrogen. This alternative design is shown to produce a reduction of the gas recycle stream (hydrogen and nitrogen) of up to an interesting 8.40%, reducing recompression associated costs. However, as the present cost of zeolite membranes is still high and their hydrogen–nitrogen selectivity moderate, in the optimal economical solution, the net annual income amounted to 4.56%, corresponding to U.S. $817,793/year savings. The heuristic was used again at a later refinement stage, yielding an appreciable percent reduction in the cost of recovering hydrogen from the purge. As gas permeation technology (and hydrogen permeation, in particular) is a very active R&D area, we hope that the results of this paper bring some attention to this novel (concentration driven) counter current application for gas permeation modules, apart from the presently more widespread (pressure driven) cross-flow application.

Process design

10.1021/ie301427z

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Citations (6)

Oxygen integration of autothermal reforming of ethanol with oxygen production, through ion transport membranes in countercurrent configuration

Computers & Chemical Engineering (2017)

Carlos Daniel Fischer Oscar A. Iribarren

Countercurrent exchange

Methane reformer

10.1016/j.compchemeng.2017.01.039

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Citations (6)

Hydrogen recovery from the purge stream of a cyclohexane production process using a mass exchange heuristic

International Journal of Hydrogen Energy (2014)

Carlos Daniel Fischer Oscar A. Iribarren

Purge

10.1016/j.ijhydene.2014.10.042

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Citations (4)

Improvements in the Design of the Cyclohexane Production Process Implementing Mass Exchange with a Counter Current Gas Permeation Membrane

Industrial & Engineering Chemistry Research (2012)

Carlos Daniel Fischer Oscar A. Iribarren

In this paper, we propose changes in the design of a cyclohexane production process, following a mass exchange design heuristic developed in a previous work (Ind. Eng. Chem. Res.2011, 50 (11), 6849–6859). In the study case considered, an optimal design was obtained which exhibits a significant 40.08% reduction in the power of the compressor that recycles unreacted reagents, and a respectable 3.59% reduction of the hydrogen consumption, resulting in an increase of the plant Net Annual Income of a 1.31%. These results highlight the importance of considering a mass exchange between the input and output streams from the reactor, at the time of synthesizing a new process.

10.1021/ie302268p

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Citations (5)

Oxygen integration between a gasification process and oxygen production using a mass exchange heuristic

International Journal of Hydrogen Energy (2016)

Carlos Daniel Fischer Oscar A. Iribarren

Countercurrent exchange

Air separation

Process design

10.1016/j.ijhydene.2015.12.124

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Citations (6)

Hydrogen recovery from the purge stream of an HDA process using the concept of Mass Exchange Networks

International Journal of Hydrogen Energy (2013)

Carlos Daniel Fischer Oscar A. Iribarren

Purge

Process design

Ceramic membrane

10.1016/j.ijhydene.2013.03.055

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Citations (4)

Alternative Process Design for Pesticide Reduction in an Edible Oil Industry Byproduct (Oil Deodorization Distillate)

ACS Food Science & Technology (2023)

Daniela S. Laoretani Carlos Daniel Fischer

Current food trends emphasize natural, nutraceutical-rich foods that are free of chemical contaminants. The goal of this study is to reduce the presence of pesticides in an oil deodorization distillate, an economical raw material rich in natural antioxidants, such as tocopherols and phytosterols. However, as a byproduct of the edible oil refining industry, it contains pesticides, which are undesirable in the final product. In this study, two common technologies employed in the edible oil industry, namely, steam-distillation and steam stripping, are analyzed for their effectiveness in separating endosulfal (pesticide) from antioxidants. An industry standard oil deodorization distillate stream with a flow rate of 40 kg/h containing 39.6 wt % of tocopherols, 52.6 wt % of free fatty acids, and 7.8 wt % of pesticide is considered, and the process variables such as temperature, steam flow, and number of separation stages are examined. These results show that both technologies reach the final product concentration to the maximum residue limits for the final product. The stripping technology has better economic and productivity performance. With this technology, the net annual income (NAI) reached was 2.5 million US$/y, while the optimum process variables were a temperature of 190 °C for feed products, 4.9 kg/h of feed steam, and 8 stages of separations. The performance was about 30% larger than that for the deodorizer. This study is highly attractive to edible oil industries looking to add value to their byproducts with minimal inversion cost. Otherwise, byproducts would have to be treated as high organic load and oxygen-demanding wastes.

Steam distillation

Vegetable oil

10.1021/acsfoodscitech.3c00261

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Citations (2)

Mass Integration as a Design Heuristic: Improvements in the HDA Process

Industrial & Engineering Chemistry Research (2011)

Carlos Daniel Fischer Oscar A. Iribarren

This paper explores mass exchanging the outlet and inlet streams of a reactor, as a design heuristic within the hierarchical process design procedure by Douglas [AIChE J. 1985, 31 (3), 353–361 and Conceptual Design of Chemical Processes; McGraw–Hill, 1988], who worked on the HDA process to test the proposal. The heuristic is used at an early stage of the hierarchy, when deciding the recycle and separation system structure of the process. If the reaction requires operating conditions with reactants in excess or that catalyze the reaction, which must be removed after the reaction, there is a concentration gradient between the inlet and outlet streams that may be used as the driving force in a mass exchanger (if such a device is available for the particular case). When applied to the HDA process, this methodology generated alternatives different from the previously proposed by other authors by resorting to a ceramic membrane gas permeation unit to perform the mass exchange of hydrogen. The performance of applying the heuristic was tested comparing the flow sheets proposed by several authors with and without this mass exchanger. The success of implementing this mass exchange networks synthesis concept was dependent on the concentration of the component to be transferred in the rich stream (i.e., it works if there is an appropriate driving force).

Component (thermodynamics)

Process design

Unit operation

10.1021/ie2013554

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Citations (13)

Nonlinear Model for the Globally Optimal Design of Vertical Vapor Liquid Separation Vessels

Industrial & Engineering Chemistry Research (2020)

Carlos Daniel Fischer André L.H. Costa Miguel J. Bagajewicz

Separation vessels are traditionally designed based on rules of thumb that guide the designer to a feasible solution. Despite its widespread use, this approach presents important limitations, which is mostly that there are no concerns about the identification of an optimal solution. Recently, the use of mathematical programming was proposed to solve the design problem of a vertical separation vessel through a mixed-integer linear programming procedure. However, despite the advantages of the mixed-integer linear model, this method has important shortcomings. In this article, we show deficiencies of this linear model and we present a mixed-integer nonlinear model solved using a mixed-integer nonlinear programming procedure. We briefly highlight the importance of using discrete standard values of pipes as well as plates for the design. We also address the use of different recommendations associated to the height of the vessel, thus generating conservative as well as optimistic models and we extend the scope of the design problem to the inclusion of demisters.

Scope (computer science)

Rule of thumb

10.1021/acs.iecr.0c04379

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Citations (1)