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Method for producing phosgene |
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Method for producing color-stable MDA and MDI |
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Separation of a substance mixture consisting of hydrogen chloride and phosgene |
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Method for separating out solvent from a reaction mixture resulting from an isocyanate synthesis and for purifying this solvent |
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METHOD FOR PRODUCING MIXTURES CONSISTING OF DIPHENYLMETHANE DIISOCYANATES AND POLYPHENYLENE-POLYMETHYLENE-POLYISOCYANATES CONTAINING A REDUCED AMOUNT OF CHLORINATED SECONDARY PRODUCTS AND WITH A REDUCED IODINE COLOR INDEX |
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