Patent ID: 7790001
Filing Date: 2010-09-07
Classification: B01D,C07C,Y10S

Abstract:
1. A method for reducing corrosion of an ethylene glycol distillation apparatus, comprising the steps of: a) providing an ethylene glycol distillation apparatus, said ethylene glycol distillation apparatus comprising an evaporator vessel and a drying vessel connected thereto, at least one of said evaporator vessel and said drying vessel having inside walls which comprise iron; b) flowing an ethylene glycol containing fluid through the evaporator vessel and then through the drying vessel; and c) introducing an additive component comprising sodium nitrite and sodium hypophosphite into at least one of the evaporator vessel and drying vessel while flowing the ethylene glycol containing fluid through the evaporator vessel and the drying vessel, such that the additive component reacts with iron of the inside walls of at least one of the evaporator vessel and the drying vessel, thereby forming a protective coating on the inside walls of at least one of the evaporator vessel and the drying vessel.