Process for manufacturing isocyanates
AssigneeHuntsman International LLC
InventorsRobert Henry Carr, Johannes Lodewijk Koole, Udo Brian Dave Mike Rodger Bruinsma
Life of this patent
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Abstract
The present invention relates to a process for manufacturing isocyanates from an amine compound. The process comprises the steps of a) Providing chlorine; b) Providing carbon monoxide; c) Reacting said chlorine and said carbon monoxide for providing phosgene, the carbon monoxide being provided in an adjustable molar excess; d) Providing an amine compound and phosgenating said amine compound using said phosgene thereby providing said isocyanate; the process further comprises adjusting said adjustable molar excess, i.e. the molar excess of carbon monoxide, for adjusting the color of the isocyanate.
Claims9
A process for manufacturing isocyanates from an amine compound, the process comprising the steps of
- a) providing chlorine, wherein the chlorine comprises bromine in the range of 50 to 500 ppm in molecular or bound form;
- b) providing carbon monoxide;
- c) reacting said chlorine and said carbon monoxide for providing phosgene, the carbon monoxide being provided in an adjustable molar excess, wherein the mol ratio of carbon monoxide over chlorine is in a range of above 1.000:1.000 up to or equal to 1.025:1.000;
- d) providing an amine compound and phosgenating said amine compound using said phosgene thereby providing said isocyanate;
- and
- wherein the process further comprises adjusting said adjustable molar excess for adjusting the colour of the isocyanate.
A process for manufacturing isocyanates from an amine compound, the process comprising the steps of
- a) providing chlorine, wherein the chlorine comprises bromine in the range of 50 to 500 ppm in molecular or bound form;
- b) providing carbon monoxide;
- c) reacting said chlorine and said carbon monoxide for providing phosgene, the carbon monoxide being provided in an adjustable molar excess, wherein the mol ratio of carbon monoxide over chlorine is in a range of above 1.0001.000 up to or equal to 1.025:1.000;
- d) providing an amine compound and phosgenating said amine compound using said phosgene thereby providing said isocyanate;
- and
- wherein the process further comprises adjusting said adjustable molar excess for adjusting the colour of the isocyanate, wherein adjusting said molar excess comprises;
- defining a target molar excess of said carbon monoxide based upon a required colour of the isocyanate to be obtained;
- and
- controlling and adjusting the provision of chlorine and carbon monoxide for bringing the extant molar excess of said carbon monoxide to approximate and optionally match said target molar excess.
Dependencies are inferred from the claim text.