FIELD: chemistry.
SUBSTANCE: invention relates to three variants of an apparatus with a circulating fluidised bed for the dehydration of alkanes. According to one of the variants, the apparatus includes a riser, a separator connected with the riser, a regenerator connected with the separator, a discharge tank located below the regenerator, and a transport line connecting the discharge tank with the riser. The transport line is therein adapted to receive hot regenerated oxygen-free catalyst from the discharge tank; and pre-treat the catalyst with reducing gas in order to adjust the degree of oxidation of the catalyst metals prior to re-introduction of the catalyst into the lower part of the riser, wherein the transport line is formed in the form of an elongated U-shaped tube, so that the degree of oxidation of the catalyst metals is adjusted by the time the catalyst reaches the bottom of the riser.
EFFECT: dehydration of alkanes by means of the created apparatus.
19 cl, 3 dwg
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