Loading patent…
AssigneeNalco Chemical Company
InventorsPaul Fearnside, Christopher J. Murphy
Estimating the term…
The disclosure is a process for inhibiting corrosion in condensing systems comprising wet hydrocarbons and chloride which comprises feeding a mixture of amines to the condensing system to elevate the pH profile of condensed water above the range in which severe corrosion of system internals can occur. The amine blend is formulated to preclude deposition and accumulation of the hydrochloride salts of the amines above the water dewpoint and is optimized to the condensing system to minimize amine treat rate. In one embodiment, the amine blend feed rate is controlled using a small condensing system which condenses a slipstream of gas taken from the system upstream of the condensing zone and continually measures the pH profile in the condensing zone.
A process for inhibiting corrosion on internal surfaces of a condensing system containing hydrocarbons, water, ammonium chloride and amine hydrochlorides, comprising:
A process for inhibiting corrosion in a zone comprising internal surfaces, the zone containing a condensing system comprising hydrocarbons, water, ammonium chloride and amine hydrochlorides, the process comprising the step of feeding a blend of amines to the zone at a rate sufficient to maintain the water condensate pH in the zone above a pH of about 5, wherein the blend of amines contains a sufficient number of amines so that for each amine the partial pressure of its hydrochloride salt does not exceed the vapor-liquid/equilibrium pressure for that salt at or above the water dewpoint temperature of the condensing system and in which the amine blend comprises amines with K.sub.b 's greater than ammonia and the feed of the amine blend to the system contains sufficient amines with K.sub.b 's greater than ammonia to prevent formation of deposits of solid ammonium chloride on the internal surfaces which are at temperatures above the water dewpoint temperature of the condensing system.
A process for inhibiting corrosion in a condensing system comprising hydrocarbons, water, ammonium chloride and amine hydrochlorides, the process comprising the steps of:
A method of inhibiting corrosion within a pipestill during fractionation of a mixture comprising hydrocarbons, water, ammonium chloride, and amine hydrochlorides wherein the pipestill has an upper zone which operates at temperatures below the water dewpoint of the mixture and a lower zone which operates at temperatures above the water dewpoint temperature of the mixture, the method comprising the step of:
Dependencies are inferred from the claim text.