Analyze Naphtha Quality in Crude Distillation Unit

The quality of fractions from the CDU (crude distillation unit) need to be continuously monitored, assuring the refinery that it is maintaining peak performance from the column while controlling product quality to downstream units.

Naphtha is the lightest and highest quality hydrocarbon drawn off the top of the column. Because it has very low levels of impurities, naphtha normally has a clear, “water-white” visual appearance. The quality of naphtha is measured using the Saybolt ASTM D156 color testing standard as well as other methods. High quality naphtha typically measures in the +28 to +30 Saybolt color range whereby +30 is the highest measurable quality. Any yellowish/brown color of the Naphtha stream indicates the presence of undesirable contamination often due to an upset or reduced process efficiency.


Analyze Naphtha Quality in Crude Distillation Unit Benefits

  • Immediate Detection of Process Upsets and Imbalance
  • Reduced Off-Spec and Reworked Product
  • Improved Downstream Processing
  • Inline Measurements with no Sample Conditioning
  • Reduced Sampling and Laboratory Analysis
  • Continuously Documented Quality Assurance Records
  • Excellent Return on Investment

Catching Contamination Before It Becomes Costly

Increased color intensity typically indicates the presence of undesirable contamination resulting from a process upset or a reduction in process efficiency. Upsets generally occur when the heavier hydrocarbon fractions (such as crude) are carried upward with the lighter fractions, ultimately contaminating the naphtha. If not quickly remedied, contaminated naphtha will feed downstream damaging plant equipment and reducing product quality.

By installing an optek inline color analyzer, the naphtha stream will be continuously monitored in real-time. The sensor will accurately detect both sudden product color upsets and slow color changes caused by a gradual reduction in process efficiency. These important color measurements are made inline as product moves from the column without the need of process conditioning, even at high pressures and temperatures.

optek analyzers are designed extremely tough for reliable performance with little maintenance. All apparatus is rated for installation in the appropriate process locations such as high temperature, high pressure and Class I Division 1 and 2 hazardous areas. All analyzers have process-compatible wetted materials such as stainless steel sensor bodies and sapphire sensing optics, and can be quickly and easily verified for accuracy in the field using NIST-traceable solid standards. optek converters are versatile enough to handle two sensors simultaneously, thus giving the refinery options in usage while saving capital expenses. optek analyzers are virtually assured of continuous operation with very little downtime. Quite simply, the best analyzer in the industry is maintained by the best technical support.

Analyze Naphtha Quality in Crude Distillation Unit Summary

optek inline UV-VIS-NIR analyzers, which utilize the principle of light absorption and light scattering, can be selectively specified and strategically installed at various points in the refinery to provide a host of beneficial measurements to the user. By continuously monitoring the quality of the fractions of the crude distillation unit with an optek dual-channel in-line color analyzer, the refinery can be assured of maintaining performance of the column and the subsequent feed to the downstream units. These important color measurements that directly correlate to the laboratory Saybolt color values can be made inline without sample conditioning at high pressures and temperatures.

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