US 2024/0425448 A1 · METHOD FOR PRODUCING ISOCYANATE COMPOUND, METHOD FOR PRODUCING CARBAMATE COMPOUND, METHOD FOR RECOVERING AMINE COMPOUND, AND ISOCYANATE COMPOSITION

Abstract

Provided is a method for producing an isocyanate compound, including a step (1) of reacting a primary amine compound with a carbonic acid derivative to obtain an N-substituted carbamate compound while extracting a by-product compound having a boiling point lower than a boiling point of the N-substituted carbamate compound, a step (2) of performing thermal decomposition of the N-substituted carbamate compound on a reaction solution obtained in the step (1) in the presence of an aprotic solvent to obtain an isocyanate compound while extracting a by-product hydroxy compound, a step (3) of separating the isocyanate compound and the aprotic solvent from a reaction solution obtained in the step (2), and a step (4) of removing a component having a boiling point higher than a boiling point of the isocyanate compound from a fraction obtained in the step (3) to purify the isocyanate compound.

Claims55

Dependent claims

A method for producing an isocyanate compound, comprising:

a step (1) of reacting a primary amine compound with a carbonic acid derivative to obtain an N-substituted carbamate compound while extracting a by-product compound having a boiling point lower than a boiling point of the N-substituted carbamate compound;
a step (2) of performing thermal decomposition of the N-substituted carbamate compound on a reaction solution containing the N-substituted carbamate compound, which is obtained in the step (1), in the presence of an aprotic solvent to obtain an isocyanate compound while extracting a by-product hydroxy compound;
a step (3) of separating the isocyanate compound and the aprotic solvent from a reaction solution containing the isocyanate compound, which is obtained in the step (2);
and
a step (4) of removing a component having a boiling point higher than a boiling point of the isocyanate compound from a fraction containing the isocyanate compound obtained in the step (3) to purify the isocyanate compound.

2 more elements

A method for recovering an amine compound represented by General Formula (IIa) from a liquid-phase component containing a compound having a higher boiling point than a boiling point of an isocyanate compound which is a by-product in a method for producing an isocyanate compound represented by General Formula (VIIa), the recovery method comprising:

a step (a) of reacting the liquid-phase component, an aromatic hydroxy compound, an active hydrogen-containing compound, and a catalyst in a reactor to obtain a reaction solution containing the amine compound represented by General Formula (IIa),
(in General Formula (VIIa), R71a is an n71a-valent organic group, and n71a is an integer of 2 or more and 8 or less),
(in General Formula (IIa), R21a is an n21a-valent organic group, and a relational expression of R21a═R71a is satisfied, and n21a is an integer of 2 or more and 8 or less, and a relational expression of n21a=n71a is satisfied).

An isocyanate composition comprising:

an isocyanate compound;
a carbonyl compound represented by General Formula (I);
and
a modified product of an isocyanate compound, in which a part of an isocyanate group of the isocyanate compound is converted into one or more functional groups selected from the group consisting of an isocyanurate group, a carbodiimide group, a uretonimine group, and an allophanate group,
wherein the isocyanate compound is a different compound from the carbonyl compound, and
a value of {3×(a molar amount of the isocyanurate group)+2×(a molar amount of the carbodiimide group)+3×(a molar amount of the uretonimine group)+2×(a molar amount of the allophanate group)}+(a molar amount of the carbonyl compound) is 0.001 or more and 8.0 or less,
(in General Formula (I), R11 is an (n11+n12)-valent organic group, R12 is a monovalent organic group, n11 is an integer of 1 or more and 8 or less, n12 is an integer of 0 or more and 7 or less, and a sum of n11 and n12 is an integer of 2 or more and 8 or less).

4 more elements

Dependencies are inferred from the claim text.

Method for producing isocyanate compound, method for producing carbamate compound, method for recovering amine compound, and isocyanate composition

Life of this patent

Method for producing isocyanate compound, method for producing carbamate compound, method for recovering amine compound, and isocyanate composition

Life of this patent

Abstract

Claims55