Processes for stabilizing toluenediamine residues are disclosed. These processes include adding a low viscosity, low boiling liquid to a toluenediamine residue composition to form a blend, and optionally, continuously monitoring the viscosity of the blend during addition of the low viscosity, low boiling liquid. The low viscosity, low boiling liquid may be added at 5% to 30% by weight based on the total weight of the blend. Further, the low viscosity, low boiling liquid may be added so that the blend has a viscosity of 10,000 cP or less throughout the temperature range of 40 C. to 95 C. Blends of toluenediamine residue compositions and low viscosity, low boiling liquids such as water, and methods of their use as a fuel are also disclosed.

The present invention relates to a process for hydrogenating a mixture (G1) in the presence of a catalyst, where the mixture (G1) comprises at least one colorless amine and at least one color-imparting component. As a result of the hydrogenation step, the at least one color-imparting component is firstly partially, preferably fully, hydrogenated, while the colorless amine, in particular aniline, is not hydrogenated or hydrogenated to only a very small extent. The color-imparting components which cause the discoloration of the amine which is itself in principle colorless are thus removed by hydrogenation, as a result of which purification of the colorless amine or the mixture (G1) is achieved.

The present invention relates to a process for hydrogenating a mixture (G1) in the presence of a catalyst, where the mixture (G1) comprises at least one colorless amine and at least one color-imparting component. As a result of the hydrogenation step, the at least one color-imparting component is firstly partially, preferably fully, hydrogenated, while the colorless amine, in particular aniline, is not hydrogenated or hydrogenated to only a very small extent. The color-imparting components which cause the discoloration of the amine which is itself in principle colorless are thus removed by hydrogenation, as a result of which purification of the colorless amine or the mixture (G1) is achieved.

The present invention relates to a composition comprising: a) at least one primary, secondary or tertiary amine and b) at least one agent which masks the odor of said at least one amine, said at least one odor-masking agent comprising at least one ether (b1), optionally, but preferably, at least one terpene and/or one terpenoid (b2) and optionally, but preferably, at least one oxime (b3). The invention also relates to the use of an odor-masking agent in order to mask the odor of at least one amine.

The present invention relates to a composition comprising: a) at least one primary, secondary or tertiary amine and b) at least one agent which masks the odor of said at least one amine, said at least one odor-masking agent comprising at least one ether (b1), optionally, but preferably, at least one terpene and/or one terpenoid (b2) and optionally, but preferably, at least one oxime (b3). The invention also relates to the use of an odor-masking agent in order to mask the odor of at least one amine.

The present invention relates to a composition comprising: a) at least one primary, secondary or tertiary amine and b) at least one agent which masks the odor of said at least one amine, said at least one odor-masking agent comprising at least one ether (b1), optionally, but preferably, at least one terpene and/or one terpenoid (b2) and optionally, but preferably, at least one oxime (b3). The invention also relates to the use of an odor-masking agent in order to mask the odor of at least one amine.

A composition including a quaternary onium hydroxide in a non-aqueous solvent, wherein the quaternary ammonium hydroxide has a concentration in the range from about 5% by weight to about 50% by weight of the composition; and imidazolidine-2,4-dione, wherein the imidazolidine-2,4-dione has a concentration in the range from about 10 to about 5000 parts per million of the composition.

A composition including a quaternary onium hydroxide in a non-aqueous solvent, wherein the quaternary ammonium hydroxide has a concentration in the range from about 5% by weight to about 50% by weight of the composition; and imidazolidine-2,4-dione, wherein the imidazolidine-2,4-dione has a concentration in the range from about 10 to about 5000 parts per million of the composition.

The invention relates to a method for preparing a suspension of a hydrochloride of an organic amine, comprising the following steps of (i) initially charging at least one organic solvent in a reaction vessel to form a liquid level, (ii) adding hydrogen chloride, (iii) adding the organic amine, wherein the organic amine is added below the liquid level present in the reaction vessel and steps (ii) and (iii) are at least partly carried out simultaneously. Furthermore, the present invention also relates to a method wherein the suspension obtained after step (iii) is reacted in a step (iv) with phosgene to obtain the organic isocyanate corresponding to the organic amine used, to the corresponding organic isocyanate and to the use of the organic isocyanate for producing polyisocyanates.

The invention relates to a method for preparing a suspension of a hydrochloride of an organic amine, comprising the following steps of (i) initially charging at least one organic solvent in a reaction vessel to form a liquid level, (ii) adding hydrogen chloride, (iii) adding the organic amine, wherein the organic amine is added below the liquid level present in the reaction vessel and steps (ii) and (iii) are at least partly carried out simultaneously. Furthermore, the present invention also relates to a method wherein the suspension obtained after step (iii) is reacted in a step (iv) with phosgene to obtain the organic isocyanate corresponding to the organic amine used, to the corresponding organic isocyanate and to the use of the organic isocyanate for producing polyisocyanates.