Tricyanohexane purification methods
AssigneeAscend Performance Materials Operations LLC
InventorsSanjay Dube, Darrick Elmore
Life of this patent
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Abstract
Provided herein are processes for purifying TCH in a feed stream, such as an adiponitrile process stream. The processes include a first separating step of separating the adiponitrile process stream to form a first overhead stream comprising low-boiling components and high-boiling components and a first bottoms stream comprising high-boiling components. The processes also include a second separating step of separating the first overhead stream in one or more distillation columns to form a lights stream comprising low-boiling components, a heavies stream comprising high-boiling components, and a TCH stream.
Claims19
-19. (canceled)
A process for purifying TCH, the process comprising:
- a first separating step of flashing an adiponitrile process stream to form a first overhead stream comprising low-boiling components and high-boiling components, and a first bottoms stream comprising high-boiling components and solid impurities;
- a second separating step of distilling the first overhead stream to form a second overhead stream comprising low-boiling components, and a second bottoms stream comprising TCH and heavies;
- a third separating step of distilling the second bottoms stream to form a third distillate comprising TCH and less than 5 wt. % impurities, and a third bottoms stream comprising heavies;
- wherein the residence time in the second or third separating step is less than 8 hours.
A process for purifying TCH, the process comprising
- a first separating step of flashing an adiponitrile process stream to form a first overhead stream comprising low-boiling components and high-boiling components, and a first bottoms stream comprising high-boiling components;
- a second separating step of distilling the first overhead stream to form a second overhead stream comprising low-boiling components, a second bottoms stream comprising heavies, and a side draw comprising TCH and lights;
- a third separating step of flashing the side draw in a second flash vessel to form a third bottoms stream comprising TCH and less than 5 wt % impurities
- wherein the residence time in the second or third separating step is less than 8 hours.
A process for purifying TCH, the process comprising:
- a first separating step of flashing an adiponitrile process stream to form a first overhead stream comprising low-boiling components and high-boiling components, and a first bottoms stream comprising high-boiling components;
- a second separating step of distilling the first overhead stream to form a second overhead stream comprising low-boiling components, and a second bottoms stream comprising TCH and heavies;
- a third separating step of distilling the second bottoms stream to form a third distillate comprising TCH and impurities, and a third bottoms stream comprising heavies;
- and
- a fourth separating step of distilling the third distillate to form a fourth overhead stream comprising low-boiling components, and a fourth bottoms stream comprising TCH and less than 5 wt. % impurities
- wherein the residence time in the second, third, or fourth separating step is less than 8 hours.
A process for purifying TCH, the process comprising:
- a first separating step of separating an adiponitrile process stream to form a first overhead stream comprising low-boiling components and high-boiling components, and a first bottoms stream comprising high-boiling components;
- a second separating step of distilling the first overhead stream to form a second overhead stream comprising low-boiling components, and a second bottoms stream comprising TCH and heavies;
- third separating step of distilling the second bottoms stream to form a third distillate comprising TCH and impurities, and a third bottoms stream comprising heavies;
- and
- a fourth separating step of flashing the third distillate in a second flash vessel to form a fourth overhead stream comprising low-boiling components, and a fourth bottoms stream comprising TCH and less than 5 wt. % impurities
- wherein the residence time in the second or third separating step is less than 8 hours.
Dependencies are inferred from the claim text.