Abstract: An internal loop reactor comprises: a vertically disposed cylindrical vessel comprising a sidewall and reactor fluid outlet means; and at least one draft tube arranged vertically within the vessel. The draft tube(s) have/s an inner surface and an outer surface, wherein the draft tube(s) provide(s) (a) first conduit(s) within the draft tube(s) having a tube inlet end and a tube outlet end, and a second conduit outside of the draft tube(s) and within the sidewall, the first conduit(s) being in fluid communication with the second conduit. The reactor comprises at least one nozzle arranged concentrically to the draft tube(s) for injecting a fluid into the first conduit(s) from the tube inlet end. The inner surface of the draft tube(s) convexly curves so that the first conduit(s) exhibit(s) an annular constriction of the cross-section between the tube inlet end and the tube outlet end; wherein the constriction is located closer to the tube inlet end.

Abstract: The invention relates to a process for decomposing nitrous oxide from a gas stream (1).

Abstract: The present invention relates to a method for preparing 2?-O-fucosyllactose and to the protected fucosyl donor of the formula (I) used in this method. The method comprises reacting the fucose derivative of the formula (I) below with the compound of the general formula (II), in the presence of an activating reagent.

Abstract: A process for compressing a hydrogen-sulfide-comprising gas stream, which comprises (i) compressing the hydrogen-sulfide-comprising gas stream in a compressor, (ii) flushing the compressor with a mixture comprising dialkyl polysulfides, dialkyl disulfides and at least one amine; a process for producing sulfur compounds, selected from the group consisting of alkylmercaptans, dialkyl disulfides and alkanesulfonic acids, which comprises the conversion of hydrogen-sulfide-comprising gas streams, wherein the hydrogen-sulfide-comprising gas streams are compressed according to the process comprising steps i) and ii); and also the use of a mixture comprising dialkyl polysulfides, dialkyl disulfides and at least one amine for removing sulfur deposits which occur in the compression of hydrogen-sulfide-comprising gas streams.

Abstract: The present invention describes a reactor (1) for continuously preparing hydrogen sulfide H2S from hydrogen and sulfur, comprising a distributor device (15) for distributing gaseous hydrogen in a sulfur melt (9) present at least in a lower part of the reactor. The distributor device (15) is arranged in the sulfur melt (9) and comprises a distributor plate (16) which is arranged in the reactor (1) and has an edge (17) extending downward and, if appropriate, has passage orifices (19). The hydrogen from a hydrogen bubble which forms below the distributor plate (16) is (for example through the passage orifices (19)) distributed in the sulfur melt (9) via the distributor plate (16).

Abstract: The invention relates to a process for preparing polyisocyanates by reacting primary amines with phosgene, which comprises the steps a) mixing the amine with the phosgene, b) reacting the amine with the phosgene in a residence reactor and, if desired, c) transferring the output from the reactor of step b) into a distillation column, wherein the residence reactor in step b) is configured as a tube reactor.

Abstract: The invention provides a process for preparing isocyanates by reacting amines with phosgene, wherein the amine or a mixture of amine and a solvent is mixed in the form of an aerosol with gaseous phosgene and the amine is subsequently reacted with phosgene.

Abstract: The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase.

Abstract: The present invention relates to a process for preparing isocyanates and an apparatus suitable for this purpose, and also its use. In the process, an amine and phosgene, both in the gas phase, react in the presence of an inert medium. A number, n, of amine streams are reacted with a number, n +1, of phosgene streams in a reactor. The number n is a positive integer of at least 1. All amine and phosgene streams are introduced into the reactor through annular gaps for mixing.

Abstract: The present invention relates to a process for preparing isocyanates.

Abstract: The invention relates to a process for preparing isocyanates in the gas phase.

Abstract: Isocyanates are prepared by a process in which a product stream from the isocyanate synthesis is purified.

Abstract: A process for compressing a hydrogen-sulfide-comprising gas stream, which comprises (i) compressing the hydrogen-sulfide-comprising gas stream in a compressor, (ii) flushing the compressor with a mixture comprising dialkyl polysulfides, dialkyl disulfides and at least one amine; a process for producing sulfur compounds, selected from the group consisting of alkylmercaptans, dialkyl disulfides and alkanesulfonic acids, which comprises the conversion of hydrogen-sulfide-comprising gas streams, wherein the hydrogen-sulfide-comprising gas streams are compressed according to the process comprising steps i) and ii); and also the use of a mixture comprising dialkyl polysulfides, dialkyl disulfides and at least one amine for removing sulfur deposits which occur in the compression of hydrogen-sulfide-comprising gas streams.

Abstract: The invention relates to a process for preparing aromatic diisocyanates by reaction of phosgene with diamines in the gas phase, in which the reaction is carried out in a reaction zone at moderate pressures, i.e. the pressure in this reaction zone is more than 3 bar and less than 20 bar.

Abstract: The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase.

Abstract: The invention relates to a process for preparing polyisocyanates by reacting organic amines with phosgene, wherein the reaction is carried out in at least three stages, with the first stage being carried out in a mixing apparatus, the second stage in at least one residence apparatus and the third stage in at least one separation apparatus and the pressure in each successive stage being lower than that in the previous stage.

Abstract: The present invention relates to a process for preparing diisocyanates from diamines and phosgene in the gas phase.

Abstract: The invention relates to a process for preparing isocyanates in the gas phase.

Abstract: The invention relates to a process for preparing isocyanates in the gas phase.

Abstract: The present invention relates to a process for preparing isocyanates.