Futher processing of technical CNSL in the distilation process at reduced pressure leads to removal of the polymeric material called Residol. The composition of the distilled CNSL contains approximately 78% of cardanol, 8% cardol, 2% polymeric material, less than < 1% 2-methyl cardanol, 2.3% heptadecyl homologue triene, 3.8% heptadecyl homologue diene and the remainder other homologous phenols.
Properties: Technical CNSL undergoes all typical phenolic reactions. Its versatility in polymerization and chemicals modification and low cost find its application in the polymeric based industries . Technical CNSL properties have advantage over phenolic in certain applications such as impact resistance, flexibility, faster heat dissipation, anti corrosive, anti- microbial, insecticidal and resistant to alkali and acid solutions as well as mineral and fatty oils and various organic solvents.
A typical physical and chemical characteristics of Technical CNSL are as shown below:
|Appearance||Dark Brown Liquid|
|Specific Gravity @ 30°C||0.92 – 0.96|
|Viscosity @ 30°C||50 – 200 cps|
|Ash Content (%)||1% (Max.)|
|Moisture Content||2% (Max.)|
|Insolubles in Toluene (%)||1% (Max.)|
|Acid Value (mgmKOH/gm)||< 20|
|Hydroxyl Value (mgmKOH/gm)||170-250|
|Iodine Value (WIJS)||220 – 270|
|Saponification Value||18 – 30|
Viscosity @ 30degree Celsius (Brooke Fields Method) 130CPS max.
Ash Content at 800 degree Celsius 0.5% to 0.95%
Polymerization time 3 minutes max.
Moisture Content 0.3% max
Insoluble Matter in toluene 1% max.
Figure : Structures of Anacardic acid, Cardanol and Cardol
Cashew Nut Shell Liquid (CNSL) can be packed in any of the following :
- MS drums – 200kgs net weight
- IBC Tanks
- Flexi tanks of (19KL/22KL/24KL)
- Tanker trucks