SITE DESCRIPTION

A petrochemical plant in Israel uses on-line NIR (Near Infra Red) analysis to monitor its processes and provide real-time data for Advanced Control Software. A sketch of the plant is shown below. The NIR instrument is a PetroMetriX Beacon 2000 – II Analyzer. The Analyzer is located in control room and is connected to the 12 Field Units via telecommunication fiber optic cable. Field Units are installed at a distance of 150 – 450 meters. Measurement sequence is controlled by optical multiplexer. The system interfaces to a Honeywell TDC-300 using Modbus protocol and PLC.

Aromatic

 

 

 

CUSTOMER BENEFITS

The NIR analyzer monitors the streams at specific points where there is a need for a round-the-clock real time quantification.

The NIR analysis has a much faster response time and lower maintenance requirements than other instruments such as on-line gas chromatographs that have been traditionally used for these applications. Continuous data is provided by the analyzer and used for      Advanced Process Control and by optimization software.

 

Table 1: Properties measured with the NIR instrument

 

Properties

Field Unit #
1 2 3 4 5 6 7 8 9 10 11 12
Non-Aromatics + + + +   + +       + +
Benzene + + + + + + + +   + +  
Toluene + + + +   + + +   + +  
Ethylbenzene + + + +   + + + + + + +
p – Xylene + + + +   + + + + + + +
m– Xylene + + + +   + + + + + + +
o – Xylene + +             + +   +
C9   +             + +    
2 – Methylpentane   +                    
3 – Methylpentane   +                    
n – Hexane   +     +              
Methylcyclo-pentane   +                    
I.B.P                 +      
5% dist.                 +      
95% dist.                 +      
F.B.P                 +      

 

 

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