lunedì 20 gennaio 2014
Competitor's gilsonite lumps warehouse
this is an example of how a bad cargo is. Lot of impurities (you can see them on the surface), and product is accessible to everybody. this cargo was ready to be shipped out to Qingdao, China, as ash <20%. We tested it and find out ash was 26%, which added to impurities (stones) can give out a 30% ash content.
This is the importance of QC in gilsonite business!
venerdì 4 ottobre 2013
OXIDIZED BITUMEN
By Bitumexport: http://bitumexport.weebly.com
What Is Oxidized Bitumen?
Oxidized Bitumen is used in a wide variety of 'industrial' applications
including roofing, flooring, pipe-coating etc. It is produced by passing air through
soft bitumen/flux mixtures under controlled temperature conditions. British Standard
grades (BS 3690) are normally designated by two numbers representing the mid-points
of their softening point and penetration ranges.
How to produce Oxidized Bitumen?
Production process:
1.
Bitumen heating to 265-270 °C
2.
Transferring melted bitumen to blowing
towers
3.
Blowing air to bitumen
4.
Cooling melted bitumen with water
5.
Packing
The procedures of producing bitumen are as follows:
1.
Continuous
blowing procedure
2.
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.
These are advantages of the discontinuous producing procedure:
•
Ease and simplicity in changing blowing
condition and have production with different grades as a result.
•
Ease in generating the unit.
•
Ease in technology and also low expense
in investment.
Technical point and operating conditions are as
follows:
•
The blowing should be done from the bottom
of blowing tanker. The reaction between bitumen and air is calorific. If the heat
produced during the mixture is high, the heat of reaction is controlled by water
injection.
•
Admixture of air and the volume of blowing
air are two important variants in blowing process. In bitumen producing plant, bitumen
60/70 is usually got by blowing. In this case for making bitumen 90/15 or 85/25
distilled used oil or crude oil should be injected to the product according to the
volume 20-25 % otherwise the fragility in bitumen lead to inferior production.
•
Increasing the heating temperature, air
injection amount, time and tower pressure increase the speed of production process
reaction. The suitable temperature for production operation is 265-270 °C which
should be controlled not to be ascended since in high temperature and in 288 °C intensity of reaction becomes more sever and incontrollable
which lead to explosion in tower.
•
The long time stay of bitumen in tower
in any condition is not in favor of system and should be delivered to drum or empty
tanker after being ready.
•
If the liquid surface in blowing tower
is low, not more than particular limit should be added to the system for the extra
air gather in empty parts and lead to ignition nearly. And if the temperature is
kept high, the inside heat of tower ascend fats and this issue cause inside explosion
and damage the system.
•
Blowing tower is filled up to 70%. Air
injection is done in 190-232°C. The final point of blowing is specified by sampling
and testing of bitumen properties. Finally the temperature of product should be
kept 150- 165 °C in order to have loading and packing capability.
The production process is as follows:
The producing operation of oxidized bitumen mainly includes tank loading
different steps, bitumen blowing, condenser external gases and packing. So in the
beginning the loose bitumen shipped to the plant by tanker is transferred to the
raw material store tanker. In order to transfer the bitumen easily to the blowing
tower the burner is contrived at the bottom of the store tanker to heat them. It
is necessary to say that if the blowing towers are empty, hot bitumen can be uploaded
directly to them and blowing operation start.
Since the volume of bitumen increases as a result of blowing and it
may overflow, the blowing tower is filled up to 70%.
Air injection is usually done when the temperature of material reach
to 190-230 °C.
For gradual heating and also pipes filling with the air is entered
from the top of the tower and at the bottom the bitumen dispread monotonously in
phase via nozzle then oxidation is done accordingly and the light molecule, volatile
gases and steam are emitted from the top of the tower.
Blowing operation is done in temperature range 215-290 °C but the suitable
temperature is between 265 to 270 °C. The needed heat is provided by burner contrived
at the bottom of the tower. The bitumen reaction is calorific so in order to prevent
the explosion danger resulted from temperature increasing, the temperature can be
controlled by water injection, burner extinguisher and air amount reducing.
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. It is necessary to be transferred to store after
packing and presented to sale.
It is necessary to say that the produced gas and steam entered the
condenser through the pipe fixed at the top of the blowing tower. In this stage
the bad smelling gases and oily and volatile parts are separated from then transfer
to sewage accompanied with water. Other unseparated gas parts is emitted from top
of the condenser then transfer to furnace and burned there. After cooling the blowing
oven and reaching them to 150-160 °C, all the content of blowing oven which is hard
bitumen is able to be loaded and packed. Because of the liquid height in blowing
tower, oxidized bitumen is transferred by specific gravity and there is no need
to use pump. Packing is done in two sections and in 25 kg craft paper bags
(palletized) and in 25 kg cartons (on a steel pallet/display). For fast operation
(preventing from cooling & hardening) in every section several taps are fixed
so that it can fill specific bag and carton with bitumen in same time.
OXIDIZED BITUMEN GRADES
•
OXIDIZED BITUMEN GRADE 85/25
•
OXIDIZED BITUMEN GRADE 95/25
•
OXIDIZED BITUMEN GRADE 90/40
•
OXIDIZED BITUMEN GRADE 115/15
Oxidized Bitumen grades are produced by passing air through soft bitumen
under controlled temperature conditions. This process gives the bitumen more rubbery
properties than penetration or hard grade bitumen, and enables the product to serve
a variety of uses in industrial applications. These 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.
They can also be used for industrial applications such as pipe coating, roofing,
waterproofing, flooring, mastics, sound damping, carpet backing, adhesive and electrical
applications.
TECHNICAL SPECIFICATIONS
SPECIFICATION OF OXIDIZED BITUMEN 85/25
|
TEST METHOD
|
|
Specific gravity @25/25 C
|
1.05 approx
|
D-70
|
Penetration @25C
|
20/30
|
D-5
|
Softening point C
|
80/90
|
D-36
|
Ductility@25C
|
1.5min
|
D-113
|
Loss on heating (wt)%
|
0.2max
|
D-6
|
Flash point C
|
260min
|
D-92
|
Solubility in CS2 (wt)%
|
99min
|
D-4
|
SPECIFICATION OF OXIDIZED BITUMEN 95/25
|
TEST METHOD
|
|
Specific gravity @25/25 C
|
1.05 approx
|
D-70
|
Penetration @25C
|
20/30
|
D-5
|
Softening point C
|
90/100
|
D-36
|
Ductility@25C
|
1.5min
|
D-113
|
Loss on heating (wt)%
|
0.2max
|
D-6
|
Flash point C
|
260min
|
D-92
|
Solubility in CS2 (wt)%
|
99min
|
D-4
|
SPECIFICATION OF OXIDIZED BITUMEN 115/15
|
TEST METHOD
|
|
Specific gravity @25/25 C
|
1.05 approx
|
D-70
|
Penetration @25C
|
10/20
|
D-5
|
Softening point C
|
110/120
|
D-36
|
Ductility@25C
|
1.5min
|
D-113
|
Loss on heating (wt)%
|
0.2max
|
D-6
|
Flash point C
|
260min
|
D-92
|
Solubility in CS2 (wt)%
|
99min
|
D-4
|
SPECIFICATION OF OXIDIZED BITUMEN 110/30
|
TEST METHOD
|
|
Specific gravity @25/25 C
|
1.05 approx
|
D-70
|
Penetration @25C
|
25/35
|
D-5
|
Softening point C
|
115/125
|
D-36
|
Ductility@25C
|
5.5min
|
D-113
|
Loss on heating (wt)%
|
0.2max
|
D-6
|
Flash point C
|
260min
|
D-92
|
Solubility in CS2 (wt)%
|
99min
|
D-4
|
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