Organic Vapor Separation:  Process Design with Regards to High-Flux Membranes and the Dependence on Real Gas Behavior at High Pressure Applications

1999 ◽  
Vol 38 (10) ◽  
pp. 3754-3760 ◽  
Author(s):  
A. Alpers ◽  
B. Keil ◽  
O. Lüdtke ◽  
K. Ohlrogge
Keyword(s):  
High Pressure ◽  
Process Design ◽  
Separation Process ◽  
High Flux ◽  
Real Gas ◽  
Organic Vapor

scholarly journals Cavitation patterns in high-pressure homogenization nozzles with cylindrical orifices: Influence of mixing stream in Simultaneous Homogenization and Mixing

2021 ◽  
Author(s):  
V. Gall ◽  
E. Rütten ◽  
H. P. Karbstein
Keyword(s):  
High Pressure ◽  
Process Design ◽  
High Speed ◽  
State Of The Art ◽  
Back Pressure ◽  
High Pressure Homogenization ◽  
Unit Operation ◽  
Mixing Chamber ◽  
Cavitation Intensity ◽  
Droplet Sizes

AbstractHigh-pressure homogenization is the state of the art to produce high-quality emulsions with droplet sizes in the submicron range. In simultaneous homogenization and mixing (SHM), an additional mixing stream is inserted into a modified homogenization nozzle in order to create synergies between the unit operation homogenization and mixing. In this work, the influence of the mixing stream on cavitation patterns after a cylindrical orifice is investigated. Shadow-graphic images of the cavitation patterns were taken using a high-speed camera and an optically accessible mixing chamber. Results show that adding the mixing stream can contribute to coalescence of cavitation bubbles. Choked cavitation was observed at higher cavitation numbers σ with increasing mixing stream. The influence of the mixing stream became more significant at a higher orifice to outlet ratio, where a hydraulic flip was also observed at higher σ. The decrease of cavitation intensity with increasing back-pressure was found to be identical with conventional high-pressure homogenization. In the future, the results can be taken into account in the SHM process design to improve the efficiency of droplet break-up by preventing cavitation or at least hydraulic flip.

A framework for optimised sustainable solvent mixture and separation process design

2018 ◽  
pp. 755-760
Author(s):  
Eduardo Sánchez-Ramírez ◽  
Jaime D. Ponce-Rocha ◽  
Juan G. Segovia-Hernández ◽  
Fernando I. Gómez-Castro ◽  
Ricardo Morales-Rodriguez
Keyword(s):  
Process Design ◽  
Solvent Mixture ◽  
Separation Process

Thermoelastohydrodynamic Behavior of Mechanical Gas Face Seals Operating at High Pressure

2007 ◽  
Vol 129 (4) ◽  
pp. 841-850 ◽  
Author(s):  
Sébastien Thomas ◽  
Noël Brunetière ◽  
Bernard Tournerie
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Numerical Modeling ◽  
Face Seal ◽  
Inertia Effects ◽  
Real Gas ◽  
Choked Flow ◽  
Face Seals ◽  
Mechanical Face Seal ◽  
Gas Expansion

A numerical modeling of thermoelastohydrodynamic mechanical face seal behavior is presented. The model is an axisymmetric one and it is confined to high pressure compressible flow. It takes into account the behavior of a real gas and includes thermal and inertia effects, as well as a choked flow condition. In addition, heat transfer between the fluid film and the seal faces is computed, as are the elastic and thermal distortions of the rings. In the first part of this paper, the influence of the coning angle on mechanical face seal characteristics is studied. In the second part, the influence of the solid distortions is analyzed. It is shown that face distortions strongly modify both the gap geometry and the mechanical face seal’s performance. The mechanical distortions lead to a converging gap, while the gas expansion, by cooling the fluid, creates a diverging gap.

Multiple-flow-regime models for real gas transport in fractal porous media at high pressure

2021 ◽  
Vol 196 ◽  
pp. 107684
Author(s):  
Lan Zhang ◽  
Yingjun Wang ◽  
Ming Liu ◽  
Liquan Wang ◽  
Hengxu Liu
Keyword(s):  
High Pressure ◽  
Porous Media ◽  
Flow Regime ◽  
Gas Transport ◽  
Real Gas

scholarly journals Systematic design of separation process for bioethanol production from corn stover

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Suksun Amornraksa ◽  
Ittipat Subsaipin ◽  
Lida Simasatitkul ◽  
Suttichai Assabumrungrat
Keyword(s):  
Energy Consumption ◽  
Corn Stover ◽  
Process Design ◽  
Extractive Distillation ◽  
Separation Process ◽  
Production Costs ◽  
Bioethanol Production ◽  
Systematic Design ◽  
Separation Processes ◽  
Process Economics

Abstract Separation process is very crucial in bioethanol production as it consumes the highest energy in the process. Unlike other works, this research systematically designed a suitable separation process for bioethanol production from corn stover by using thermodynamic insight. Two separation processes, i.e., extractive distillation (case 2) and pervaporation (case 3), were developed and compared with conventional molecular sieve (case 1). Process design and simulation were done by using Aspen Plus program. The process evaluation was done not only in terms of energy consumption and process economics but also in terms of environmental impacts. It was revealed that pervaporation is the best process in all aspects. Its energy consumption and carbon footprint are 60.8 and 68.34% lower than case 1, respectively. Its capital and production costs are also the lowest, 37.0 and 9.88% lower than case 1.

Numerical Method for Simulating High Pressure CO2 Flows With Nonequilibrium Condensation

2018 ◽  
Author(s):  
Takashi Furusawa ◽  
Hironori Miyazawa ◽  
Shota Moriguchi ◽  
Satoru Yamamoto
Keyword(s):  
High Pressure ◽  
Numerical Method ◽  
Supercritical Co2 ◽  
Compressible Flows ◽  
Ideal Gas ◽  
Experimental Result ◽  
High Mass ◽  
Real Gas ◽  
High Pressure Co2 ◽  
Nonequilibrium Condensation

A numerical method for compressible flows with nonequilibrium condensation is reconstructed for simulating supercritical CO2 flows with nonequilibrium condensation under high pressure conditions. Thermophysical properties are interpolated from pressure-temperature look-up tables and density-internal energy look-up tables, which are generated using the polynomial equations in REFPROP. We employ the high pressure nonequilibrium condensation model in which the critical radius of a liquid droplet is modified by considering non-ideal gas. We simulate high pressure CO2 flows through a Laval nozzle, which was experimentally investigated by Lettieri et al. High-pressure CO2 passes through the nozzle, leading to a decrease in its pressure and temperature. It reaches the supercooled condition near the throat. Nucleation and the subsequent growth of droplets lead to an increase in the condensate mass fraction in the diverging area. The proposed method for real gas reproduced the peak of pressure distribution owing to the release of latent heat, whereas the numerical result assuming ideal gas is different from the experimental result. The nucleation region obtained using the present method is earlier and narrower than that in the case of ideal gas. The early and rapid nucleation leads to the high mass condensate rate at the outlet. These results show that considering the real gas effect and nonequilibrium condensation is crucial for developing the impeller of a compressor for the supercritical CO2 Brayton cycle.

Study on real-gas equations of high pressure hydrogen

2010 ◽  
Vol 35 (7) ◽  
pp. 3100-3104 ◽  
Author(s):  
Honggang Chen ◽  
Jinyang Zheng ◽  
Ping Xu ◽  
Lei Li ◽  
Yanlei Liu ◽  
...  
Keyword(s):  
High Pressure ◽  
Real Gas ◽  
Real Gas Equations ◽  
Pressure Hydrogen
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