The objective of the work is to analyze and predict the multiple steady states through dynamic analysis when the reactive distillation column is subject to different input disturbances. The dynamic simulations are carried out to analyze the open loop dynamic responses of the system using step changes in the manipulated variable (reflux ratio, holdup, hydrocarbon mixture feed stage, hydrocarbon ...

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...

A rate-based simulation method is developed with the correlation for mass transfer rate, which was obtained in our experiments of the homogeneous and heterogeneous ternary distillation with a sieve tray column. The simulation method is applied to the process of ethanol dehydration with benzene, which consists of a dehydrationand an entrainer recovery column. In the simulation study, the effect ...

In order to implement a quasi-optimal trajectory derived from pinch theory [1,2], a temperature tracking control system composed by an open-loop reflux ratio control plus a closed-loop correction for disturbance rejection is proposed. To adjust the closed-loop controller we use the referential dynamic reaction of the process [3] and tuning rules [4] that, though they were originally developed f...

A cryogenic pilot distillation column operating at total reflux is described. It was used to measure the pressure drop and flooding of various structured packings, first using pure nitrogen and then using an oxygen-argon mixture. By varying the pressure, the nitrogen system was used to characterize the capacity of each packing via Wallis plots. The oxygen-argon flooding data can be accurately p...

We construct new entanglement distillation protocols by interpolating between the recurrence and hashing protocols. This leads to asymptotic two-way distillation protocols, resulting in an improvement of the distillation rate for all mixed Bell diagonal entangled states, even for the ones with very high fidelity. We also present a method how entanglement-assisted distillation protocols can be c...

The jet and diesel fuels production line has been simulated using the universal simulating program ChemCad. choice of rectification process calculation module was substantiated. Grayson-Streed Lee Kesler models were used for thermodynamic system phase equilibrium multicomponent mixture. model an oil mixture distillation unit developed. temperature profile column obtained; optimization problem s...

BACKGROUND/AIMS Gastroesophageal reflux disease (GERD) may occur with acid, bile or in a mixed form. Endoscopic injury and mucosal metaplasia are a known sequelae to pathological GERD. The aim of the study was to determine the contribution of acid and duodenogastroesophageal reflux to endoscopic severity in patients with GERD and Barrett's esophagus (BE). MATERIALS AND METHODS Ninety-one pati...