Antifreeze recovery system

Gas separation – Means within gas stream for conducting concentrate to collector

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203 18, 203 25, 203 71, 260643D, B01D 338

Patent

active

040146677

ABSTRACT:
Antifreeze agents such as methanol used in treating hydrocarbon-containing streams to prevent the formation of hydrates and ice are recovered in a combination process comprising extraction, fractionation, and stripping together with a common reboiler system for the fractionation and stripping. One process comprises a combination of solvent extracting methanol with water, fractionation of the water-methanol extract to separate methanol overhead, further treatment of the fractionation bottoms by stripping to remove residual methanol overhead which is returned to the fractionation zone, and recycling at least a portion of the fractionation bottoms as solvent to the initial extraction step.

REFERENCES:
patent: 3092667 (1963-06-01), Murphy
patent: 3230156 (1966-01-01), Katzen
patent: 3434934 (1969-03-01), Washer
patent: 3442770 (1969-05-01), Wentworth et al.
patent: 3531915 (1970-10-01), Nagel et al.
patent: 3555837 (1971-01-01), McClintock
patent: 3886757 (1975-06-01), McClintock et al.

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