Built for Repeatable Results
Accurate organic chloride numbers depend on a consistent naphtha cut. The system delivers tight cut-point control so your D4929 results are reproducible run after run, protecting your refinery from corrosion surprises.
ASTM D4929 Organic Chloride Distillation System
A distillation system for preparing the naphtha cut used to determine organic chloride content in crude oil. Conforms to ASTM D4929 Methods A and B.
01
Determination of Organic Chloride Conten
The Determination of Organic Chloride Content in Crude Oil
Organic chlorides do not occur naturally in crude oil. There are several possible sources of contamination including chlorinated solvents used in dewaxing pipelines or other equipment.
Organic chlorides often decompose during refinery processes such as distillation, reforming and hydrotreating. One of the products of decomposition is hydrochloric acid (HCl). Since many refinery components are easily corroded/damaged by HCl, it is essential to monitor levels of organic chlorides in crude oil to prevent introduction of this contaminant into refinery processes.
The B/R D4929 distillation system is used for the first step in the test which is to distill the naphtha fraction from the crude oil from the initial boiling point up to 204°C vapor temperature. The organic chlorides have boiling points in this range and so will be concentrated in this naphtha fraction.
After distillation, the naphtha fraction is washed with caustic and water to remove hydrogen sulfide.
Detection of the organic chloride concentrations in the naphtha fraction can be performed by:
- Sodium biphenyl reduction followed by potentiometric titration
- Oxidative combustion followed by microcoulometric titration
- X-ray fluorescence spectrometry
02
Features
- Performs the distillation portion of ASTM D4929
- Turnkey set up with safety shields
- Produces a naphtha cut to 204°C (400°F)
- Precise, repeatable fraction collection
- Backed by B/R Instrument service and support
03
How the D4929 Method Works
Distill
The crude oil is distilled to recover the naphtha fraction, from the initial boiling point up to 204°C vapor temperature, where the organic chlorides concentrate. This is the step the B/R system performs.
Wash
The naphtha fraction is washed with caustic and water to remove hydrogen sulfide.
Analyze
The organic chloride concentration in the naphtha is measured by potentiometric titration, microcoulometric titration, or X-ray fluorescence spectrometry.
04
Related
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