The disclosure provides bio-asphalt, bio-asphalt compositions and a method for preparing them. It belongs to the technical field of asphalt material. The method of the disclosure uses bio-oil as the raw material, adopts a combination of extraction process and oxidation process to prepare bio-asphalt, and modifies the product obtained from bio-oil by extraction process or bio-asphalt with ordinary petroleum asphalt and/or aromatic hydrocarbon oil and a macromolecular material to obtain a bio-asphalt composition.

The disclosure provides bio-asphalt, bio-asphalt compositions and a method for preparing them. It belongs to the technical field of asphalt material. The method of the disclosure uses bio-oil as the raw material, adopts a combination of extraction process and oxidation process to prepare bio-asphalt, and modifies the product obtained from bio-oil by extraction process or bio-asphalt with ordinary petroleum asphalt and/or aromatic hydrocarbon oil and a macromolecular material to obtain a bio-asphalt composition.

A method for adjusting the softening point of a pitch material includes heating the pitch material to form molten pitch material, and rising the softening point of the pitch material by moving a plurality of movable members so that the movable members repetitively move at least some of the molten pitch material out of a liquid level of the molten pitch material and back to the molten pitch material.

A method for adjusting the softening point of a pitch material includes heating the pitch material to form molten pitch material, and rising the softening point of the pitch material by moving a plurality of movable members so that the movable members repetitively move at least some of the molten pitch material out of a liquid level of the molten pitch material and back to the molten pitch material.

A reactor is provided for the preparation of modified bitumen, which reactor comprises a horizontal housing comprising a cylindrical wall and two side walls, wherein a bitumen inlet has been provided at or near one of the side walls of the housing and a bitumen product outlet has been provided at or near the opposite side wall of the housing, wherein a plurality of inlets for the provision of oxygen-containing gas has been provided in the cylindrical wall of the housing between the bitumen inlet and the bitumen product outlet, which multi-purpose reactor is further provided with a mixer arranged inside the housing comprising at least one rotor rotating within at least one stator having a plurality of openings. The reaction is used to prepare modified bitumen by contacting bitumen in the reactor with a modified elevated temperature and pressure.

A reactor is provided for the preparation of modified bitumen, which reactor comprises a horizontal housing comprising a cylindrical wall and two side walls, wherein a bitumen inlet has been provided at or near one of the side walls of the housing and a bitumen product outlet has been provided at or near the opposite side wall of the housing, wherein a plurality of inlets for the provision of oxygen-containing gas has been provided in the cylindrical wall of the housing between the bitumen inlet and the bitumen product outlet, which multi-purpose reactor is further provided with a mixer arranged inside the housing comprising at least one rotor rotating within at least one stator having a plurality of openings. The reaction is used to prepare modified bitumen by contacting bitumen in the reactor with a modified elevated temperature and pressure.

A process for increasing a softening point of isotropic pitch includes providing a hydrocarbon feed including isotropic pitch having a first softening point and mixing the hydrocarbon feed with a carrier gas such that a mixture of the hydrocarbon feed and the carrier gas establishes at least one chosen from an annular-mist flow regime and a mist flow regime. The annular-mist flow regime includes a liquid film layer and a dispersion of entrained droplets, and the mist flow regime includes a dispersion of entrained droplets. The mixture of the hydrocarbon feed and the carrier gas approaches a vapor-liquid equilibrium. The process also includes discharging an effluent of the mixture into a separation vessel and separating a vapor phase and a liquid phase in the separation vessel. The liquid phase includes isotropic pitch having a second softening point greater than the first softening point.

A process for increasing a softening point of isotropic pitch includes providing a hydrocarbon feed including isotropic pitch having a first softening point and mixing the hydrocarbon feed with a carrier gas such that a mixture of the hydrocarbon feed and the carrier gas establishes at least one chosen from an annular-mist flow regime and a mist flow regime. The annular-mist flow regime includes a liquid film layer and a dispersion of entrained droplets, and the mist flow regime includes a dispersion of entrained droplets. The mixture of the hydrocarbon feed and the carrier gas approaches a vapor-liquid equilibrium. The process also includes discharging an effluent of the mixture into a separation vessel and separating a vapor phase and a liquid phase in the separation vessel. The liquid phase includes isotropic pitch having a second softening point greater than the first softening point.

The present invention relates to a method for preparing carbon nanotubes which are capable of more effectively preparing carbon nanotubes having a uniform and fine size, and a dispersion composition of carbon nanotubes obtained using the same. The method for preparing carbon nanotube comprises the steps of: forming a dispersion comprising carbon nanotube bundles, a dispersant and a solvent; and enabling the dispersion to consecutively pass through a high pressure homogenizer, wherein the dispersant is a mixture of plural kinds of polyaromatic hydrocarbon oxides, and the carbon nanotube bundles are pulverized or disentangled while passing through a microchannel of the high pressure homogenizer under a shear force to form carbon nanotubes.

The present invention relates to a method for oxidizing asphalt which comprises dispersing an oxygen containing gas throughout an asphalt flux in an oxidation zone while the asphalt flux is maintained at a temperature which is within the range of about 400 F. to 550 F., wherein the oxygen containing gas is introduced into the oxidation zone through a recycle loop. The recycle loop pumps asphalt flux from the oxidation zone and reintroduces the asphalt flux into the oxidation zone as oxygen enhanced asphalt flux. The recycle loop will typically include a pump which pulls the asphalt flux from the oxidation zone and which pumps the oxygen enhanced asphalt flux into the oxidation zone, and wherein the oxygen containing gas is injected into the recycle loop at a point before the asphalt flux enters into the pump.