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US 11,976,025 B2Granted
Acetonitrile separation process
AssigneeAscend Performance Materials Operations LLC
InventorsKyle Kissell, Basil Michaels
Life of this patent
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Abstract
Provided herein are processes for the separation of acetonitrile from low-purity feedstock streams. The provided processes are particularly useful for isolating acetonitrile at high purity from chemical manufacturing waste streams that include methanol, water, and allyl alcohol.
Claims20
A process for producing acetonitrile, the process comprising:
- digesting a feedstock stream comprising acetonitrile, methanol, hydrogen cyanide, and water to remove hydrogen cyanide in a digester to produce an intermediate acetonitrile stream comprising less than 1 wt % hydrogen cyanide;
- distilling the intermediate acetonitrile stream in a first distillation column to yield a first bottoms stream comprising water, and a first distillate stream comprising acetonitrile, wherein the first distillation column is operated at a pressure less than 150 kPa;
- and
- purifying the first distillate stream to yield a product acetonitrile stream and a recycle stream.
1 more element
Dependencies are inferred from the claim text.