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بسم الله الرحمن الرحيم

السلام عليكم ورحمة الله وبركاته

Introduction: When the reactors of Hydroprocessing Units and Reformers and other plant equipment are given for maintenance or for regeneration of the catalyst, it becomes necessary to remove all residual hydrocarbons from the system, since these residual hydrocarbons are injurious to the health of the men entering these equipment for maintenance jobs or they may lead to explosion in the subsequent regeneration operations. These equipments are usually purged with nitrogen to remove all hydrocarbons from the system. For ensuring that the equipment is free from hydrocarbons, the nitrogen coming out of the system is tested for them. The level of hydrocarbons that need to be detected in the nitrogen is usually below 0.1% by volume.

Preparation of The Chromatograph Connect the injection port with an empty SS, preferably glass, tubing of approximately 1 M length and 3 mm dia to the detector. If the gas chromatograph is equipped with a gas injection valve, connect a gas sampling loop of 2 ml or of a higher capacity. In the absence of gas injection valve , use a hypodermic syringe for introducing the sample through the injection port septum. Maintain the oven at room temperature. Adjust the carrier gas flow to about 2 ml per minute. Pure nitrogen from a cylinder can be used as the carrier gas.

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