Naphtha chlorine test

The various test methods dedicated to the determination of the amounts of carbon, hydrogen, and nitrogen (ASTM D-5291) as well as the determination of oxygen, sulfur, metals, and chlorine (ASTM D-808) are not included in this discussion. Although necessary, the various tests available for composition (Chapter 2) are left to the discretion of the analyst. In addition, test methods recommended for naphtha (Chapter 4) may also be applied, in many circumstances, to gasoline. 

Test Method B, Combustion and Microcoulometry—The washed naphtha fiaction of a crude oil specimen is injected into a flowing stream of gas containing about 80 % oxygen and 20 % inert gas such as argon, helium, or nitrogen. The gas and sample flow through a combustion tube maintained at about 800 C. The chlorine is converted to chloride and oxychlorides whidi then flow into a titration cell where they react with the silver ions in the titration cell. The silver ions thus consumed are coulometrically replaced. The total current required to replace the silver ions is a measure of the chlorine present in the injected samples. 

In a pyrolysis plant tested in Great Britain, a sand bed is fluidized using some of the cracked gases produced by thermal cracking of plastics introduced as chips or strips. A mixture of polyolefins and up to 10% PVC is cracked at 600°C in an inert atmosphere to yield a naphtha-type gas. Mass yields are about 90%, and 10% of the gas is used to heat the bed. Chlorine is adsorbed within the bed by calcium oxide. Sand beds can be quite insensitive to the size of material fed. Kaminsky graphically describes one reactor that produced a mixture of gas, liquid, and carbon black from scrap tires [70] ... 

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