Oxidized Bitumen
Oxidized Bitumen ( Blown Asphalt)
Oxidized Bitumen ( Blown Asphalt)
Applications
Oxidized Bitumen has a wide variety of industrial applications Roof Felts i.e.
, Water Proofing for Roof & Floors, Anti Rust Pipe Coating, Anti Slip Layer
Compound for Piling, Sound Dampening Felts, Under Carriage Sealant and Coats
in the Automotives, Electrical Cable Joint Protection (Fillers), Joint
Filling Compounds, Sealants, Bituminous Marine Mastic for the Oil & Gas
Industry and many more in our day to day life.
Technical Advantages
Durability
Flexibility
Water Resistant
Chemical Stability
Manufacturing Method
Oxidized Bitumen is produced by either Continuous or Staggered Blowing
Process. Heated Penetration Grade Bitumen up to 300 deg C under controlled
environment is blown with air in the Chimney / Tower. This process removes
the Oil Content in the Bitumen and it is oxidized. Fuel oil is added to the
process to make the penetration higher, if it is required to do so.
The oxidized bitumen, still at higher temperature, to be handled carefully
and packed into Bags or drums as required. The associated safety and work
place hazards need to be handled efficiently.
The different grades for suited applications produced are designated by two
numbers to indicate the mid-points of their softening point and penetration
ranges.
Manufacturing Process
Chemicals are added in order to decrease the time for the reaction time for
blowing which shall have better control over the blowing conditions to
produce different grades of Oxidized Bitumen with low capital investment.
Blowing is preferably done from the bottom of the Chimney/ Tower and the
Temperature can be controlled by Water Jacketing.
Additives
While using distilled Used Oil or Crude Oil for the production of 90/10, 85/
25 grades to the tune of 25 percent, care shall be taken the injection of oil
shall be free from water to eliminate any explosive reactions during the
process.
Dry and Harder Grades
Other grades are produced without adding Oil and the finished product will
have near to Zero Penetration is predominantly used in Asia.
Process Control
Capacity of the Tower to be limited to not more than 75 percent as the volume
increases with rise in temperature during the process. Injection will take
place around 230 degrees.Tower Temperature shall not exceed 290 degrees as
the reaction will get critical leading to explosion.
Oxidation is done when the Admixture enters from the top of the tower and the
bitumen at the bottom sprayed through the nozzle at an optimal temperature of
270 degree Celsius. Sampling from the tower has to be analyzed to determine
the end point of blowing and the required properties of the final product.
Waste and Recovery
Gas and steam produced in the process shall be circulated through the
condenser and separated. Minor amounts of furnace oil shall be recovered
which can be reused to hear the furnaces.
Packing
Packing is done when the final product temperature brought down to 160
degrees in bags with Moulds or in steel drum before it cools down to room
temperature and become solid.
by: Ellango
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