Presentation on theme: "Analytical Analysis in Chemical Process Control"— Presentation transcript:
1 Analytical Analysis in Chemical Process Control Instrumentation and controlAnalytical Analysis in Chemical Process ControlDr. –Ing. Naveed RamzanDepartment of Chemical Engineering, U.E.T. Lahore Pakistan25. März 2017 / Dr. –Ing Naveed Ramzan25. März 2017 / Dr. –Ing Naveed Ramzan
2 Purpose of Measuring Physical Properties - Control Product Quality IntroductionPurpose of Measuring Physical Properties- Control Product Quality- Maintain Safe Operation- Process Optimization
3 Instruments for measurement of: Composition pH Viscosity OutlineInstruments for measurement of:CompositionpHViscosityOptical properties
4 Composition Measurement: Analyzers in the Process Industry Reactor ControlEnvironmental MonitoringProduct CompositionsPurposeControl of chemicalprocessesRequirementsLow MaintenanceSimplicity“Ruggedness”Few or no moving parts
5 Challenges in Analyzer Design Exposure to corrosive environmentsMust withstand non-ideal concentrations of secondary componentsMaintenance only once every few monthsReliability is key
6 Classification of Process Analyzers Nonspecific(Inexpensive)Specific(Costly)LiquidLiquidGasGasThermalConductivityElectricalConductivityGasChromatographyIR/UV-VISSpectroscopy
7 Sampling Systems Sample Sample Conditioning Analyzer Extraction ProcessStreamSampleReturn
8 In-line sampling On-line sampling Direct sampling in process line Sampling SystemsIn-line samplingDirect sampling in process lineAdvantage: no sampling delayDisadvantage: measurement affected by temperature and pressure variationsOn-line samplingExtract sample continuously and send to instrumentAdvantage: control of temperature, pressureDisadvantage: time lag before measurement
9 CHROMATOGRAPHYChromatography basically involves the separation of mixtures due to differences in the distribution coefficient (equilibrium distribution) of sample components between 2 different phases. One of these phases is a mobile phase and the other is a stationary phase.
10 Concentration of component A in stationary phase Distribution Coefficient (Equilibrium Distribution )Definition:Different affinity of these 2 components to stationary phase causes the separation.Concentration of component A in stationary phaseConcentration of component A in mobile phase
11 Kinds of Chromatography 1. Liquid Column Chromatography2. Gas Liquid Chromatography3. Thin-layer Chromatography
12 LIQUID COLUMN CHROMATOGRAPHY A sample mixture is passed through a column packed with solid particles which may or may not be coated with another liquid.With the proper solvents, packing conditions, some components in the sample will travel the column more slowly than others resulting in the desired separation.
14 FOUR BASIC LIQUID CHROMATOGRAPHY The 4 basic liquid chromatography modes are named according to the mechanism involved: 1. Liquid/Solid Chromatography (adsorption chromatography)A. Normal Phase LSCB. Reverse Phase LSC 2. Liquid/Liquid Chromatography (partition chromatography)A. Normal Phase LLCB. Reverse Phase LLC 3. Ion Exchange Chromatography 4. Gel Permeation Chromatography (exclusion chromatography)