This invention relates to a process for operating a gas phase phosgenation plant (100) to form an isocyanate (4) by reacting an amine (2) with phosgene (1), in which the gas phase phosgenation plant is started up by first charging the plant with phosgene. At the same time as, or after the first charge of phosgene, the amine supply devices are rendered inert using a hot inert gas stream (30). Then, amine is admixed for the first time. In this way and by maintaining a pressure drop in the amine and phosgene devices to the mixing zone, the back mixing of phosgene into the amine-containing reactant stream during start-up is prevented.

A solvent refining method for isocyanate prepared by the phosgene method and multistage absorbing towers used in same. Solvent to be refined which contains water, iron, and/or phosgene, hydrogen chloride and other materials with color is dealt by the present method and multistage absorbing towers, which can effectively prevent a drying agent from absorbing water and hardening, partial overheating in the tower and generating channeling. Meanwhile, the pressure drop is effectively lowered. In addition, the content of water is 50 ppm, the content of iron is 5 ppm, the content of phosgene and hydrogen chloride is 20 ppm, PtCo chroma is 20 in the refined solvent. Therefore, the refined solvent can be used as the solvent for preparing isocyanate in the phosgene method and remarkably improve an L color of isocyanate.

The invention relates to a method for preparing isocyanates by the phosgenation of the corresponding amines in which problems resulting from the formation of deposits in apparatuses of the reaction segment during activation (starting) and deactivation (termination) of the method can be prevented by processing measures, in particular ensuring that there is a surplus of phosgene relative to the phosgenating amine during the critical starting and termination steps of the method.

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.

Disclosed are systems for producing an isocyanate composition associated with a digital asset, methods for producing an isocyanate composition associated with a digital asset, apparatuses for generating a digital asset, computer-implemented methods for generating a chemical pass-port, computer program elements for generating a digital asset, uses of an isocyanate composition associated with a digital asset, uses of a digital asset, products produced from the isocyanate composition and associated with a digital asset, a digital asset including one or more decentral identifier(s) and data related to the environmental impact data, apparatuses for producing a product associated with the digital asset and methods for producing a product associated with the digital asset.

Disclosed are systems for producing an isocyanate composition associated with a digital asset, methods for producing an isocyanate composition associated with a digital asset, apparatuses for generating a digital asset, computer-implemented methods for generating a chemical pass-port, computer program elements for generating a digital asset, uses of an isocyanate composition associated with a digital asset, uses of a digital asset, products produced from the isocyanate composition and associated with a digital asset, a digital asset including one or more decentral identifier(s) and data related to the environmental impact data, apparatuses for producing a product associated with the digital asset and methods for producing a product associated with the digital asset.

A method of reacting amine compounds with halons and perhalogenated compounds, resulting in the conversion of these ozone-depleting species into non-volatile salts and a variety of other amine derivatives is disclosed.

A method of reacting amine compounds with halons and perhalogenated compounds, resulting in the conversion of these ozone-depleting species into non-volatile salts and a variety of other amine derivatives is disclosed.

A method for preparing an aliphatic isocyanate according to an exemplary embodiment of the present disclosure includes a first step of introducing an aliphatic amine and an organic solvent into a reactor, a second step of supplying gaseous hydrogen chloride into the reactor through a sparger, and a third step of stirring the aliphatic amine and the organic solvent, and the hydrogen chloride with a stirrer installed in the reactor, wherein in the third step, a stirring force of the stirrer is controlled to 500 to 4,000 W/m.sup.3.

A method for preparing an aliphatic isocyanate according to an exemplary embodiment of the present disclosure includes a first step of introducing an aliphatic amine and an organic solvent into a reactor, a second step of supplying gaseous hydrogen chloride into the reactor through a sparger, and a third step of stirring the aliphatic amine and the organic solvent, and the hydrogen chloride with a stirrer installed in the reactor, wherein in the third step, a stirring force of the stirrer is controlled to 500 to 4,000 W/m.sup.3.