Organic Chlorine compounds determination in oil

The Application is modification of ASTM D 4929-04 «Standard Test Methods for Determination of Organic Chloride Content in Crude Oil». 
The Test method includes sampling, naphtha fraction distillation (204oC), naphtha cleaning from hydrogen sulfide and inorganic chlorides.
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Organic chloride species are potentially damaging to refinery processes. Hydrochloric acid can be produced in hydrotreating or reforming reactors and the acid accumulates in condensing regions of the refinery. Unexpected concentrations of organic chlorides cannot be effectively neutralized and damage can result. Organic chlorides are not known to be naturally present in crude oils and usually result from cleaning operations at producing sites, pipelines, or tanks. Therefore determination of organic chlorides in crude oil is an obligatory procedure.
The analysis procedure is as following:
Internal standard (5000 ppm Bismuth solution in non-polar solvent) is mixed with distilled  naphtha fraction.
Two sample cups are filled with the mixture, covered with film and measured in a spectrometer.
Mass content of organic chlorides is determined with a preliminary obtained calibration equation.
There are no interfering factors.
The test method specifies determination of organic chlorides in the range from 1 mg/kg up to 50 mg/kg. Other elements presence in the test material does not influence the test measurements.

Precision parameters
The precision, as determined by statistical examination of interlaboratory test results on eight motor gasoline samples and seven diesel samples. Precision parameters are determined for chlorine content in oil fraction distilled at 204oC in the range from 5 to 50 mg/kg.

Repeatability 
The difference between two test results obtained by the same operator with the same apparatus under constant operating conditions on identical test material would, in the long run, in the normal and correct operation of the test method, exceed 1.3 mg/kg in only one case in twenty.

Reproducibility 
The difference between two single and independent test results obtained by different operators working in different laboratories on identical test material would, in a long run , in normal and correct operation of the test method, exceed 2.0 mln-1 in only one case in 20.

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