Measurement and Testing

  • Xplorer Liquid Archie
  • Image A : Table 1
  • Petroleum Naphtha – 0.26 mg/L TX - Peak Overlay

Organic Bonded Chloride Determination through Oxidative Combustion Microcoulometry

Nov 15 2017 Comments 0

For decades, the presence of organic bonded chloride has been a relevant parameter for refinery and petrochemical processes. The challenges in recent years for the instrumental determination of chloride, have been the increasing need of a matrix independent method and an ever decreasing detection limit. Why is chloride such an important parameter and which benefits does Oxidative Combustion Microcoulometry offer?

The Importance of Monitoring Organic Chloride Content

Refineries convert crude oil into all kinds of petroleum products varying from fuels up to the residual bitumen. Presence of chloride in crude oil may result in catalyst poisoning and corrosion of process units which have a negative impact on the profitability as well as the reliability and safety of the refinery. Chlorides in the refining process are difficult to control, especially the organic chlorides. They cause various forms of corrosion at different temperatures and pressure levels, downstream of the distillation unit. Besides the corrosive effects, chloride also deteriorates the quality of the final product.

How to Detect (Organic) Chloride Components?

There are multiple international standards that specifically focus on the analysis of (organic) chloride, often expressed as Total Chloride (TX), in crude oil, intermediates and final products of the refining unit. Oxidative combustion microcoulometry is the benchmark technique to which multiple international standards refer. One of the benefits of oxidative combustion microcoulometry is that all (organic) chloride components are converted to hydrochloric acid (HCl). The most popular international standard to measure the organic chloride content are: ASTM D4929, UOP 779 and ASTM D5808. Table 1* demonstrates the capabilities of TE Instruments’ XPLORER-TX while analysing samples according to these international standards. *(Please refer to image A for table 1)

Oxidative Combustion Microcoulometry Compared with other Techniques

Recently, XRF related techniques present themselves as alternatives to measure chloride in petroleum products. When compared, we notice that microcoulometric detection has numerous benefits:

  • Microcoulometric titration can be applied to a much wider range of sample types, including liquids, solids, gas and LPG.
  • Microcoulometry is not affected by the matrix and inhomogeneity of the sample. This can be seen as a major issue for XRF technique.
  • Microcoulometry is an absolute detection technique. All (organic) chloride components are converted to hydrochloric acid (HCl). The XPLORER-TX achieves a 100% recovery. Therefore, calibration of the XPLORER-TX can be done but is not even necessary.
  • Sulfur is another harmful component which is commonly present in petroleum products. Microcoulometry does not experience interferences of sulfur to the chloride signal. No sulfur analysis or dilution required prior to chloride analysis.
  • The measuring range of the XPLORER-TX (0.025 mg/L – 1000 mg/L), makes it the most versatile analyser for the analysis of chloride. Measuring samples in the sub-ppm range is impossible for most XRF techniques.
  • At ppb level, the performance of the XPLORER-TX is unrivaled within the industry.
Read comments0

Do you like or dislike what you have read? Why not post a comment to tell others / the manufacturer and our Editor what you think. To leave comments please complete the form below. Providing the content is approved, your comment will be on screen in less than 24 hours. Leaving comments on product information and articles can assist with future editorial and article content. Post questions, thoughts or simply whether you like the content.


Digital Edition

Petro Industry News October/ November 2017

October 2017

Fuel for Thought - Restek Wins Company of the Year ASTM News - New Standard Helps Meet Need for Hydrocarbon Impurity Testing PEFTEC Preview - Excitement Builds for PEFTEC 2017 - Det...

View all digital editions

Events

Gulf Coast Conference

Jan 17 2018 Houston, TX, USA

Saudi Plastics and Petrochem

Jan 21 2018 Jeddah, Saudi Arabia

National Biodiesel Conference + Expo

Jan 22 2018 Fort Worth, Tx, USA

Trinidad and Tobago Energy Conference

Jan 22 2018 Port of Spain, Trinidad

SPE Hydraulic Fracturing Technology Conference

Jan 23 2018 Woodlands, TX, USA

View all events