Biodegradable ionic liquids for aircraft deicing

A process for making deicing compositions, comprising:

• dissolving a choline halogen salt(s) in at least one alcohol having the structure selected from the group consisting of alcohols having a CnH2n+1OH structure where “n” is equal or greater than 1 and passing through an ion exchange resin to produce a first solution of choline hydroxide;
• reacting said first solution with an organic acid(s) in an equimolar ratio to produce a second solution;
• and
• evaporative distilling said second solution to remove by-product including water and solvents to produce pure eco-friendly choline-based ionic liquids having deicing capabilities.