Class / Patent application number | Description | Number of patent applications / Date published |
560352000 | Purification or recovery | 8 |
20080262263 | Method For Purifing Residues Containing Isocyanates - The present invention comprises a process for purifying isocyanate-comprising residues. | 10-23-2008 |
20090216042 | Concentrating method, treating method, concentrating system and treating system for polyisocyanate residues - A concentrating method and a concentrating system for concentrating polyisocyanate residues that that can effectively concentrate polyisocyanate residues from crude polyisocyanate comprising polyisocyanate and polyisocyanate residues in a short time and can also suppress increase in viscosity to provide stable transport of the residues and prevent blockage of the transport line, and a treating method and a treating system for decomposing the concentrated components to polyamine. | 08-27-2009 |
20090275776 | PROCESS AND EQUIPMENT FOR THE DECOMPOSITION AND RECOVERY OF ISOCYANATE COMPOUNDS - The present invention relates to a method for decomposing and recovering an isocyanate compound, which comprises: continuously mixing and dispersing into water at high pressure and high temperature an isocyanate compound having at least one isocyanate group or group derived from an isocyanate group in a molten state or solution state, supplying a liquid mixture containing the isocyanate compound and the water at high pressure and high temperature continuously to a reactor, followed by subjecting the isocyanate compound to a decomposition reaction in the reactor, and recovering a raw material for the isocyanate compound or a derivative thereof; and an apparatus for decomposing and recovering an isocyanate compound, which comprises: a reactor which brings water at high pressure and high temperature into contact with an isocyanate compound having at least one isocyanate group or group derived from an isocyanate group to cause a decomposition reaction, a water supply line which continuously supplies the water at high pressure and high temperature to a reactor, a compound supply line which continuously supplies the isocyanate compound in a molten state or solution state to the water supply line, an on-off valve which communicates the compound supply line with a vicinity of a communication portion of the water supply line to the reactor, a dehydrating device which conducts a dehydration of a decomposition reaction product discharged from the reactor, and a purification device which purifies the decomposition reaction product after the dehydration. | 11-05-2009 |
20100249450 | PROCESS FOR PRODUCING POLYISOCYANATE - 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. | 09-30-2010 |
20110190534 | METHOD FOR DECOMPOSING AND RECOVERING ISOCYANATE COMPOUND - The present invention relates to a method for decomposing and recovering an isocyanate compound, which comprises: continuously mixing and dispersing into water at high pressure and high temperature an isocyanate compound having at least one isocyanate group or group derived from an isocyanate group in a molten state or solution state, supplying a liquid mixture containing the isocyanate compound and the water at high pressure and high temperature continuously to a reactor, followed by subjecting the isocyanate compound to a decomposition reaction in the reactor, and recovering a raw material for the isocyanate compound or a derivative thereof; and an apparatus for decomposing and recovering an isocyanate compound, which comprises: a reactor which brings water at high pressure and high temperature into contact with an isocyanate compound having at least one isocyanate group or group derived from an isocyanate group to cause a decomposition reaction, a water supply line which continuously supplies the water at high pressure and high temperature to a reactor, a compound supply line which continuously supplies the isocyanate compound in a molten state or solution state to the water supply line, an on-off valve which communicates the compound supply line with a vicinity of a communication portion of the water supply line to the reactor, a dehydrating device which conducts a dehydration of a decomposition reaction product discharged from the reactor, and a purification device which purifies the decomposition reaction product after the dehydration. | 08-04-2011 |
20120123153 | METHOD FOR PURIFYING MIXTURES COMPRISING 4,4'-METHYLENEDIPHENYL DIISOCYANATE - The invention relates to a method for purifying mixtures comprising 4,4′-methylenediphenyl diisocyanate, which comprises purifying by distillation a mixture I comprising 4,4′-methylene-diphenyl diisocyanate by means of a column K1, wherein the gaseous stream comprising the mixture I is brought into contact in the column K1 with at least one liquid compound A which has the same or higher boiling point than 4,4′-methylenediphenyl diisocyanate, and wherein the gaseous stream O obtained at the top of the column and comprising 4,4′-methylenediphenyl diisocyanate is cooled in a maximum of 5 seconds to a temperature of 20° C. to 60° C. | 05-17-2012 |
20120142960 | METHOD FOR PURIFYING MIXTURES COMPRISING 4,4'-METHYLENEDIPHENYL DIISOCYANATE - The invention relates to a method for purifying mixtures comprising 4,4′-methylenediphenyl diisocyanate, which comprises purifying by distillation a mixture I comprising 4,4′-methylenediphenyl diisocyanate having a hydrolyzable chlorine content as specified in ASTM D4663-10 of greater than 100 ppm by means of a column K | 06-07-2012 |
20160159734 | PROCESS FOR OBTAINING ORGANIC ISOCYANATES FROM DISTILLATION RESIDUES FROM ISOCYANATE PREPARATION - The present invention relates to a process for obtaining organic isocyanate from a phosgenation product comprising the isocyanate, comprising the following steps: a) workup to the phosgenation product, the workup comprising at least one distillation step in which a first portion of the organic isocyanate is removed as distillate and a distillation residue comprising a second portion of the organic isocyanate is obtained, b) workup of the distillation residue obtained in a), the workup comprising at least one distillation step which is conducted at a temperature of up to 110° C. at a pressure of not more than 1 mbar, wherein at least 50% by weight of the second portion of the organic isocyanate is removed from the distillation residue. | 06-09-2016 |