- Home
-
Producten & Oplossingen
-
Industrieën & afdelingen
- Vind producten via branches
- Chemische industrie
- Farmaceutica & biotechnologie
- Voedingsmiddelen en dranken
- Onderwijs en overheid
- Laboratoria en gezondheidsinstituten
- Metaal, kunststoffen en elektronische componenten
- Grondstoffen en juwelen
- Pulp, papier en textiel
- Engineering, machinebouw en systeemintegrators
- Transport en logistiek
- Nutsbedrijven en gemeenten
- Retail
- Find Products by Workplaces
- Onderzoek en ontwikkeling
- Techniek, Procesontwikkeling & Verhogen
- Laboratorium, Inspectie & Kwaliteitscontrole
- Ontvangst & Opslag
- Productie en verwerking
- Verpakking & Vullen
- Logistiek, Post & Verzending
- Onderhoud & Service
- IT / Information Technology
- Retail
- Water, Energie & Nutsbedrijven
- Diensten & Ondersteuning
- Over ons
- Neem contact met ons op
|
|
Inferential Cascade Control Using WinRC with a LabMax Reactor
Aug 19, 2008
Jeff Hippler (The Dow Chemical Co.) reported on the use of a LabMax system to mimic a plant reactor for laboratory-scale development. The LabMax reactor, in conjunction with WinRC software, provided off-the-shelf capability for development of a functional control algorithm.
Background and approach (from Jeff Hippler's abstract)
There are a number of good reasons to perform commercial chemical reactions in a boiling solvent. The vaporization of the solvent can remove heat efficiently without the need for an external cooling loop. Plus, the temperature of the reactor can be controlled by modulating the reactor pressure. In addition, if there is a significant difference in the volatility of the reactants, products and solvent, the pressure/temperature relationship can be used as a means to infer the reactor composition.
In this work, the LabMax® reactor with the WinRCTM software was configured to mimic a commercial boiling reactor. In order to accomplish this, we needed to be able to use the measured temperature and pressure to calculate the liquid phase composition of the reactor and then use this calculated composition as an input to the dosing controller. In addition, it was desired to operate the reactor at a constant temperature which required reactor pressure be controlled to compensate for real-time variations in the reactor composition.
The reactor control was accomplished by using the External Data Source instrument in the software and customizing the Basics External Excel® macro supplied by METTLER TOLEDO. This talk led the audience through the conceptual design of the control system and the detailed steps of the system configuration. The goal of the talk was the show that the External Data Source is not only a powerful option which opens up limitless possibilities, but it is also easy to use.
Results and Conclusions
With some innovative use of the WinRCTM reactor control software, an inferential cascade control algorithm was designed for this reaction involving polymerization of ethylene. The concentration of the reactant feed remaining in the reactor was inferred from the pressure/temperature boiling point equilibrium. Control of the reactant concentration was achieved by manipulation of the dosing rate as well as by the manipulation of the reactor pressure set-point. The flexibility of the LabMax® reactor, in combination with the control capabilities of the WinRCTM software allowed the laboratory system to be used to easily mimic the operating conditions and limitations that would be present in full-scale production reactor.
There are a number of good reasons to perform commercial chemical reactions in a boiling solvent. The vaporization of the solvent can remove heat efficiently without the need for an external cooling loop. Plus, the temperature of the reactor can be controlled by modulating the reactor pressure. In addition, if there is a significant difference in the volatility of the reactants, products and solvent, the pressure/temperature relationship can be used as a means to infer the reactor composition.
In this work, the LabMax® reactor with the WinRCTM software was configured to mimic a commercial boiling reactor. In order to accomplish this, we needed to be able to use the measured temperature and pressure to calculate the liquid phase composition of the reactor and then use this calculated composition as an input to the dosing controller. In addition, it was desired to operate the reactor at a constant temperature which required reactor pressure be controlled to compensate for real-time variations in the reactor composition.
The reactor control was accomplished by using the External Data Source instrument in the software and customizing the Basics External Excel® macro supplied by METTLER TOLEDO. This talk led the audience through the conceptual design of the control system and the detailed steps of the system configuration. The goal of the talk was the show that the External Data Source is not only a powerful option which opens up limitless possibilities, but it is also easy to use.
Results and Conclusions
With some innovative use of the WinRCTM reactor control software, an inferential cascade control algorithm was designed for this reaction involving polymerization of ethylene. The concentration of the reactant feed remaining in the reactor was inferred from the pressure/temperature boiling point equilibrium. Control of the reactant concentration was achieved by manipulation of the dosing rate as well as by the manipulation of the reactor pressure set-point. The flexibility of the LabMax® reactor, in combination with the control capabilities of the WinRCTM software allowed the laboratory system to be used to easily mimic the operating conditions and limitations that would be present in full-scale production reactor.
Products