Oxidized Bitumen is blown asphalt which is exporting in various grades as Blown bitumen 115/15, Oxidized-Bitumen 90/40,75/25, 85/25, 90/15, 105/35, 150/5 95/25 and any other grade will produce according to order.
pub-ltd is a dynamic and multi-faceted limited company actively involved in manufacturing procurement distribution and export of various grades of oxidized bitumen. We are structured into focused on oxidization of Bitumen division to serve the different needs of our customers worldwide.
We have a long history of supplying Oxidized Bitumen to bitumen factories, asphalt companies, roof insulation companies and membrane sheet manufacturer
There is more than 7 types bitumen. Their providing depend on the type of weather conditions. Oxidized-Bitumen or blown bitumen is one of them.
Hard asphalt grades are suitable for sealing saw cuts and joints where there is expected to be the minimum amount of moving in the joint. Their wide temperature range prevents bleeding in high temperature applications. Oxidized-bitumen can also be used in industrial applications like roofing, flooring, mastics, pipe coatings, electrical uses.
Some of main advantages of Oxidized-Bitumen are that it`s completely water resistant, highly flexible and durable. In addition, chemically it`s very stable. Hard Bitumen is a very flexible compound also a very durable compound. Lastly, Oxidized Bitumen has some very prominent technical advantages that makes it a very sought after compound in various uses.
It produced by passing air thru soft bitumen penetration under controlled temperature states. British Standard grades (BS 3690) normally designated by two numbers representing mid-points of softening point and penetration ranges. Bitumen used in many industries including roofing, flooring, pipe-coating etc.
Oxidized-Bitumen also known as hard bitumen, hard asphalt, blown bitumen, bitumen oxide and blown asphalt in industry. blown asphalt is grading in various degrees. The most popular grades of this product includes bitumen oxide 115/15, oxidized bitumen 90/10 also blown bitumen 90/15
How to produce Oxidized-Bitumen (Blown Bitumen)?
- Bitumen heating to 265-270 °C
- Transferring melted bitumen to blowing towers
- Blowing air to bitumen
- Cooling melted bitumen with water
The procedures of producing bitumen are as follows:
- Continuous blowing procedure
- Discontinuous blowing procedure
These two procedures are done by other two procedures named catalysis and anticatalysis .
Catalysis means adding some chemical material during the process In order to decrease blowing reaction time.
For the following reasons:
Ease and simplicity in changing blowing condition and have production with different grades as a result.
In generating unit.
Technology and also low expense in investment.
Technical point and operating conditions are as follows:
Admixture of air and volume of blowing air is two important variants in blowing process. In bitumen producing plant, bitumen 60/70 is usually got by blowing. To making bitumen 90/15 or 85/25 distilled used oil or crude oil should be injected to product according to 20-25 % otherwise fragility in bitumen lead to inferior production.
Increasing the heating temperature, air injection amount, time and tower pressure increase speed of production process reaction. Fine production temperature is 265-270°C. It should be under control. At 288°C reaction gravity becomes fast and incontrollable. It may cause to explosion in tower.
Bitumen should deliver to drum or tanker after providing because standing bitumen in tower is not in favor of system
when liquid surface in tower get low, Add to system should not be more than particular limit. Because extra air gather in empty parts lead to ignition nearly. Keeping high temperature inside tower causes explosion and en-damage system. Air injection done in 190-232°C. The final point of blowing is specified by sampling and testing of bitumen properties. Finally, product temperature should kept 150- 165 °C for loading and packing capability.
The production process is as follows:
The producing operation of oxidised asphalt mainly includes tank loading different steps, bitumen blowing, condenser external gases and packing. Firstly loose bitumen shipped to tanker. By increasing bitumen value, blowing also increases so it may overflow because blowing tower filled up to 70 %.
Air injection usually done when temperature reachs to 190-230 °C.
Bitumen dispread monotonously in phase via nozzel For gradual heating also pipes filling with the air enteres from top and bottom of tower . In oxidation process light molecule, volatile gases and steam emitted from top of tower.
Blowing we do in 215-290°C but the suitable temperature is 265 – 270°C. Blowing should done from bottom of blowing tanker. Bitumen and air reaction is calorific . controlling the reaction temperature is by water injection.
Blowing end point:
Blowing end point is usually signified by sampling from tower and bitumen properties testing. The blowing operation stops when oxidized bitumen reaches to specified properties. After this in order to fix the final point and depolymerization bitumen got in high temperature.
Produced gas and steam entered the condansor through pipe fixed at top of blowing tower, includes smelling gases, oily and volatile parts. Then transfer to sewage tend with water. Other gas parts emittes from top of condenser. Then transfer to furnace and burned there. After cooling, blowing oven and reaching to 150-160°C. In addition all blowing content oven which is hard bitumen. It`s able to loading and packing. Because of liquid height in blowing tower, it transferred by specific gravity. There is no need to use pump. It packes in carton, Kraft and poly bags. For fast operation (preventing from cooling & hardening) in every section several taps are fixed so that it can fill specific drum and carton with bitumen in same time.
Blown asphalt packing:
pub-ltd is manufacturer of all blown asphalt`s all grades. There is varius kind of packing for hard asphalt:
Blown asphalt packed in 25 or 50kg meltable polyamide bag. The melting temperature of the bag is 160~180C. Blown asphalt packed in 25 or 50Kg Craft bag. The size bags is 90x40cm. It easily palletized 1 ton on wooden pallet.
Blown asphalt also packed in carton mold. It is easy to handle and safe for shipment. in addition we are able to packe hard bitumen in Kraft bags with ability to palletize.
Blown Asphalt Grades specification: