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US 2010/0249450 A1Published application
Process for producing polyisocyanate
AssigneeMitsui Chemicals, Inc.
InventorsKoji Maeba, Haruhiko Noguchi, Tatsuki Kamatsuki, Masaaki Sasaki
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Abstract
A method for producing a polyisocyanate includes a purification step of purifying an unpurified polyisocyanate, the purification step including a tar ingredient removal step of removing tar ingredients from an unpurified polyisocyanate, and a distillation step of distilling the unpurified polyisocyanate from which tar ingredients have been removed through a dividing wall distillation column.
Claims5
A method for producing a polyisocyanate comprising a purification step of purifying an unpurified polyisocyanate,
- the purification step comprising:
- a tar ingredient removal step of removing tar ingredients from an unpurified polyisocyanate, and
- a distillation step of distilling the unpurified polyisocyanate from which tar ingredients have been removed through a dividing wall distillation column.
Dependencies are inferred from the claim text.