Online Calibration Systems

Process Analytical Technology  (PAT) combines analytical chemistry with process technology. PAT installations are used world-wide for process optimization, asset control, safety of plants and environmental measurements. The primary goal is a better management of the plant performance.

Case Introduction

In several chemical processes, volatile components are dissolved in a liquid under high pressure and/or low temperature. To control this process, the composition of these mixtures is analyzed with an on-line process gaschromatograph.

Challenges & problems

• Callibrating the process-gas chromatograph. This has to be carried out with a mixture of the concerning component(s) in a liquid. Preparation and storage of such a mixture in traditional containers is very difficult.
• Storage time is limited and the mixture will remain stable only if stored under constant pressure. If the necessary precautions are not taken, the mixture composition will change overtime (during use).

• In order to dissolve volatile components in a liquid, the system has to be operated under high pressure. This requires additional safety-precautions. Obtaining a homogenous mixture at the outlet is of major concern.

Intertek Solution

Intertek has developed a dynamic system, where a known amount of the concerning component(s) is continuously injected into a constant liquid flow. In this design, all the necessary steps are taken to prevent flashing and maintain contant pressure. Composition is easily altered by changing gas and/or liquid flows.