Yiing Mei Wu Mobil Research & Development Corp. Paulsboro, N.J. A calculation method has been developed to estimate the conditions and extent of ammonium chloride and ammonium hydrosulfide depositions in refinery process streams containing ammonia, hydrogen chloride, and hydrogen sulfide impurities. Corrosion caused by ammonium chloride (NH4Cl) and ammonium hydrosulfide (NH4HS) has long been a problem in the refining industry. Refining units that can be affected by underdeposit corrosion, or by plugging as a result of salt deposits, include the crude overhead s),stem, hydrocracker, catalytic reformer pretreater, and hydrodesulfurization units. ...

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