CONTROLLING SULPHUR LEVEL BY PROPANE DEHYDROGENATION Russian patent published in 2019 - IPC C10G25/00 C07C5/32 C07C5/327 C07C7/12 C07C11/02 C10G35/09 C10G9/00 

FIELD: technological processes.

SUBSTANCE: invention relates to controlling sulphur content, which is present as sulphur or a sulphur compound in a hydrocarbon feed stream during dehydrogenation of hydrocarbon(s) (for example, propane), contained in the hydrocarbon feed stream, to its/their corresponding olefin (for example, propylene, when the hydrocarbon is propane) without processing the feed stream by desulphurisation before it is contacted with a fluidised bed dehydrogenation catalyst, which is both a desulphurisation agent and a dehydrogenation catalyst and contains gallium and platinum on an alumina or alumina-silica catalyst support with an optional alkali metal or alkali earth metal, such as potassium. Contacting with such a catalyst produces a desulphurised crude olefin product that corresponds to the hydrocarbon and has a reduced amount of sulphur or sulphur compound relative to the amount of sulphur or sulphur compound present in the hydrocarbon feed stream prior to contact with the catalyst. Method for reducing content of sulphur which is present as sulphur or a sulphur compound in the hydrocarbon feed stream comprises placing the hydrocarbon feed stream in contact with a fluidised catalyst at a mass ratio of catalyst: (hydrocarbon feed) in the range from 1 to 100, in which the fluidised catalyst is both a desulphurisation agent and a dehydrogenation catalyst and contains gallium in an amount in the range from more than 0 wt% up to 5 wt% and platinum in an amount in the range from more than 1 to 300 ppmw of catalyst on an alumina-silica catalyst support, from 0.01 to 5 wt% alkali metal and/or alkali earth metal, under conditions sufficient to remove in both cases from the hydrocarbon feed stream at least part of the sulphur or sulphur compound contained therein, wherein the residence time of the fluidised catalyst in contact with the hydrocarbon feedstock ranges from 0.1 minutes to 10 minutes, where the amount of sulphur or sulphur compounds in the feed stream prior to contact with the catalyst is in the range from at least 1 ppmw of the feed stream to less than 1,000 ppmw of the feed stream, and dehydrogenating the hydrocarbon to produce a desulphurised crude olefin product, which corresponds to the hydrocarbon, wherein the desulphurised crude olefin product contains a reduced amount of sulphur or sulphur compound relative to sulphur or sulphur compound present in the feed stream prior to contact with the catalyst, wherein the reduced amount of sulphur or sulphur compounds is less than 50 wt% of the amount of sulphur or sulphur compound in the feed stream prior to contact with the catalyst.

EFFECT: control of sulphur level by propane dehydrogenation is disclosed.

9 cl, 2 tbl, 3 ex