METHOD FOR PRODUCTION OF OLIGOMER-SULFUR MODIFIED BITUMEN Russian patent published in 2014 - IPC C10C3/04 C08K3/06 B82Y40/00 

FIELD: oil and gas industry.

SUBSTANCE: in order to receive modified bitumen raw stock is treated by vacuum distillation of fuel oil in the vacuum distillation unit at residual pressure at the unit top of 15-25 Hg mm. The produced tar oil with content of paraffin-napthene hydrocarbons of 12-23 wt % is delivered to a buffer tank, where it is mixed with 10-30% of bituminous compound coming from the oxidizing reactor upper part and plasticiser in quantity of 5-15% of the total mass of the raw stock; the plasticiser represents a product of reaction of 15.0-15.5 wt % of styrene, 2.4-4.0 wt % of cyclohexanone peroxide, 3.1-6.0 wt % of styrenic solution of cobalt salts of synthetic fat acids C₇-C₉, and remaining part of overoxidized bitumen. Then the produced mixture with temperature of 170°C at least is delivered to the middle part of the oxidizing reactor under grid and valve tray, where air mass in volume up to 160 m³/t is delivered simultaneously with the raw stock; at that oxidation reaction in the primary oxidation zone is carried out at temperature of 215-230°C during 8-35 minutes in film mode with its further decreasing. Bitumen produced in result of oxidation is delivered to the lower bottom part of the oxidizing reactor wherein sulfur melt in quantity of 3-60% of the bitumen mass is supplied simultaneously; at that temperature in the bottom part is maintained at the level of 160-190°C, thereafter the produced oligomer-sulfur-bitumen is outputted from the lower part of the oxidizing reactor.

EFFECT: bitumen has improved adhesion and cohesion properties and a wide range of plasticity as well as lower brittleness point.

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