Ion removal from heavy ends using electrodialysis
Provided are electrodialysis systems for removing ions from heavy ends. The electrodialysis systems include an electrodialysis device comprising a brine inlet stream, a heavy ends inlet stream, a brine outlet stream, and a product outlet stream, wherein the brine outlet stream comprises more acetic acid than the brine inlet stream, and the product outlet stream comprises no more than 10% the amount of ions relative to an amount of ions in the heavy ends inlet stream.
1 . An electrodialysis system for removing ions from heavy ends, comprising:
an electrodialysis device comprising a brine inlet stream, a heavy ends inlet stream, a brine outlet stream, and a product outlet stream,
wherein the heavy ends inlet stream comprises a non-aqueous organic waste stream generated from an acetoxylation process for forming vinyl acetate monomer, wherein the non-aqueous organic waste stream comprises acetic acid, ethylene glycol, vinyl acetate, ethylene, and acetate compounds,
wherein the brine outlet stream comprises more acetic acid than the brine inlet stream, and the product outlet stream comprises no more than 15% the amount of ions relative to an amount of ions in the heavy ends inlet stream, and
wherein the conductivity of the heavy ends inlet stream is less than or equal to 10 microsiemens per centimeter.
2 . The electrodialysis system of claim 1 , wherein each of the heavy ends inlet stream, the brine inlet stream, the brine outlet stream, and the product outlet stream comprise one or more of chromium or potassium ions.
3 . The electrodialysis system of claim 1 , wherein the product outlet stream comprises no more than 50% the amount of chromium ions as that of the heavy ends inlet stream.
4 . The electrodialysis system of claim 1 , wherein the product outlet stream comprises no more than 15% the amount of potassium ions as that of the heavy ends inlet stream.
5 . The electrodialysis system of claim 1 , wherein the brine outlet stream comprises at least 400% the amount of potassium ions as that of the brine inlet stream.
6 . The electrodialysis system of claim 1 , wherein the brine inlet stream comprises no chromium ions.
7 . The electrodialysis system of claim 1 , wherein the heavy ends inlet stream comprises a composition that is different from the brine inlet stream.
8 . The electrodialysis system of claim 1 , comprising two or three electrodialysis devices.
9 . The electrodialysis system of claim 1 , wherein the system achieves 50-70% removal of chromium ions from the heavy ends inlet stream.
10 . The electrodialysis system of claim 1 , wherein the system achieves 85-100% removal of potassium ions from the heavy ends inlet stream.