The dynamic behavior for a high-purity/high-conversion reactive distillation is investigated. The impact of disturbance magnitudes and directions on both open loop and closed loop stability of the system is studied. Excess of less volatile reactant in two-reactant-two-product generic reactive distillation is found to enhance open loop stability, but decreases the products purity. However, exces...

Robust stability and performance are the two most basic features of feedback control systems. The harmonic balance analysis technique enables to analyze the stability of limit cycles arising from a neural network control based system operating over nonlinear plants. In this work a robust stability analysis based on the harmonic balance is presented and applied to a neural based control of a non...

Vapour recompression system has been used to enhance reduction in energy consumption and improvement in energy effectiveness of distillation columns. However, the effects of certain parameters have not been taken into consideration. One of such parameters is the column heat loss which has either been assumed to be a certain percent of reboiler heat transfer or negligible. The purpose of this st...

s The use of brackish water in the Saloum Delta in Senegal can be made by combining the processes of desalination as a source of solar energy, usually thermal and photovoltaic processes for membrane distillation. But the demand for energy is growing; the use of solar energy can be a good solution, given the high solar potential in these areas. Different experiences around the world have shown t...

Membrane distillation (MD), which can utilize low-grade thermal energy, has been extensively studied for desalination. By incorporating solar thermal energy, the solar membrane distillation desalination system (SMDDS) is a potential technology for resolving energy and water resource problems. Small-scale SMDDS (s-SMDDS) is an attractive and viable option for the production of fresh water for sm...

The effectiveness of disturbance suppression in a multivariable control system can depend strongly on the direction of the disturbance. The “disturbance condition number” is introduced to quantify the effect of disturbance direction on closed-loop performance. As an example a two-point composition control system for a distillation column is analyzed for various disturbance and set-point changes.

This work has been carried out to demonstrate the performances of four different state space models in the model predictive control system of a reactive distillation process that was used for the production of ethyl acetate. The state space models of the reactive distillation process were developed with the aid of System Identification Toolbox of MATLAB using the data acquired from the reactive...

the use of natural products as medicinal agents presumably predates the earliest recorded history. ocimum sanctum l., is a plant which is used in several traditional medicine systems to cure various diseases. in this study aerial parts of ocimum sanctum were collected on august 2014 from shahr-e-rey in iran. fresh and dry partsof plants essential oils were extracted with hydro-distillation and ...

the genus ocimum l. belonging to family of lamiaceae is widely distributed in iran, ocimum sanctum l. is described in many medicinal properties and a wide therapeutic range. it is used specially in the management of cough, ashtma, fever and common cold. in this research, samples were collected from shahr-e-rey, on august 2013, then essential oils were extracted by  hydro-distillation and steam ...