Abstract: A method for recovering high-purity naphthalene from a Rerun Column bottom residue is disclosed. The process begins with collecting the residue and dividing it into two portions. One portion is maintained at room temperature, while the second is cooled to approximately 16° C. to initiate the selective solidification of naphthalene. Upon gradual warming of the cooled portion to ambient temperature over 3-4 hours, a clear separation between solid naphthalene and the liquid residue is achieved. The liquid layer is decanted, and the remaining solid fraction is filtered using Whatman-1 filter paper with tissue paper to absorb residual liquids. The recovered crystals are washed 3-4 times with water to eliminate impurities and dried in a hot air oven at 100±2° C. for 2 hours. Final settling at room temperature yields dry, white crystalline naphthalene with a melting point of 80.2° C., a purity of 97.27%, and a recovery efficiency of 77.7%.

Abstract: A system and method for determining organic chlorine content in petroleum or petrochemical streams are disclosed. The system comprises an injection module configured to introduce a sample, consisting of a 204° C. cut of washed naphtha or equivalent, into a gas stream; a gas supply unit configured to deliver a gas mixture of approximately 80% oxygen and 20% inert gas selected from argon, helium, or nitrogen, into the injection module; a combustion unit maintained at approximately 800° C. to convert chlorine in the sample to chloride and oxychlorides; a titration cell, comprising: an electrolyte containing 75% acetic acid in water, a silver ion solution to react with chloride ions in the sample, resulting in a measurable electrochemical reaction; and a microcoulometer configured to measure the electric current required to replace consumed silver ions in the titration cell, wherein the measured current is indicative of the organic chlorine content.