Method and apparatus for processing glycol

摘要

Methods and apparatus for processing glycol according to various aspects of the present technology comprise a multi-stage treatment system that is configured to receive a feedstock from multiple waste stream sources containing glycol. A pre-treatment stage may be configured to process the incoming the feedstock and provide to a primary treatment stage a water/glycol solution that is substantially identical and allows for a primary treatment process that is not dependent upon the originating source of the glycol feedstock. A post-treatment stage may further process and purify the water/glycol solution.

主权项

1. A system for removing impurities from an incoming waste stream of glycol feedstock, comprising:
an ester treatment device configured to:
receive the incoming waste stream of glycol feedstock;determine an ester level within the incoming waste stream of glycol feedstock;inject a stoichiometric excess of alkali solution into the incoming waste stream of glycol feedstock comprising residual alkali solution and a pH of greater than 7, wherein the stoichiometric excess is:
calculated according to the determined ester level; andsufficient to completely hydrolyze the esters to yield constituent insoluble organic acid salts and organic alcohols; andprecipitate the insoluble organic acid salts from the incoming waste stream of glycol feedstock.