Method for producing isocyanates

A process for preparing an isocyanate, the process comprising:

• contacting fluid streams of amine, phosgene and inert medium in at least one mixing device, such that an inert medium stream is metered at least between one amine stream and one phosgene stream within the mixing device;
• and then
• reacting an amine with phosgene to form an isocyanate,
• wherein:
• the inert medium stream is metered such that a point of first contact of the amine and the phosgene occurs at a distance from a surface of the mixing device;
• a perpendicular phosgene stream is metered at an angle of about 90° relative to a longitudinal axis of a mixing chamber of the mixing device;
• a parallel amine stream is metered at an orientation parallel to the longitudinal axis of the mixing chamber;
• and
• one inert medium stream is metered into the parallel amine stream on a side of a parallel amine flow channel facing the perpendicular phosgene stream.