METHOD OF PRODUCING OLEFINS USING SATURATION OF AROMATIC COMPOUNDS Russian patent published in 2020 - IPC C10G67/02 C10G69/06 

FIELD: chemical or physical processes.

SUBSTANCE: invention relates to versions of a method of producing an olefin stream from a stream of steam cracking hydrocarbons. One of the versions of the method includes: steam cracking of a hydrocarbon stream, as a result of which a stream of steam cracking hydrocarbons and a stream of heavy pyrolysis oil are formed, wherein steam cracking hydrocarbon stream contains at least one of following compounds: butadiene, ethylene, propylene and/or any combination thereof; separation of steam cracking hydrocarbons stream, which results in formation of a stream with high content of olefins and a stream of crude pyrolysis gasoline; preliminary heating of the flow of crude pyrolysis gasoline in the pre-heating zone to a temperature of at least 50 °C and mixing heated pyrolysis gasoline with preheated hydrogen gas stream, as a result of which hydrogen/unrefined pyrolysis gasoline stream is formed in pressure range of 3.378–11.03 MPa (490–1600 psig); contacting a stream of hydrogen/unrefined pyrolysis gasoline with a first hydrotreating catalyst in a first section of a hydrotreating reactor for at least partial hydrogenation of diolefins, olefins and aromatic components in the temperature range of 50–450 °C and reaction pressure range 3.378–11.03 MPa (490–1600 psig); bringing into contact a stream of hydrogen/unrefined pyrolysis gasoline with a stream of cold gaseous hydrogen in a cooling zone to reduce the temperature of the hydrogen/unrefined pyrolysis gasoline stream; carrying out reaction of hydrogen flow/unrefined pyrolysis gasoline in presence of second hydrotreating catalyst in second section for conversion of components, containing sulfur, nitrogen, metals or any combination thereof, into sulphides, ammonia and metal sulphides, respectively, in the temperature range of 170–450 °C and reaction pressure range 3.378–11.03 MPa (490–1600 psig); removing sulphides, ammonia, metal sulphides, excess hydrogen in the separation zone to produce a stream of hydrotreated pyrolysis gasoline in the temperature range of 60–400 °C and reaction pressure range of 3.103–10.69 MPa (450–1550 psig); and separating the stream of hydrotreated pyrolysis gasoline in the fractionation zone for producing a first stream of hydrotreated pyrolysis gasoline containing a stream of light pyrolysis oil, wherein operating conditions in the fractionation zone include a temperature range of 40–450 °C and pressure range of about 0.005–2 MPa (0.7–290 psig); saturation of first stream of hydrotreated pyrolysis gasoline together with at least one additional flow of naphtha/hydrocarbon, resulting in formation of naphthenic stream; and transportation of naphthenic stream to steam cracking to obtain olefins.

EFFECT: invention provides an integrated method of increasing production of olefins from aromatic compounds-rich hydrocarbon streams and by-products simultaneously with production of valuable aromatic compounds.

20 cl, 4 dwg