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| Menthol is generally obtained by chilling mint oil and subsequent centrifuging to separate out the menthol crystals. The process may be divided into two steps , firstly menthol flakes are produced by chilling mint oil and secondly menthol flakes mixed with mint oil again chilled to produce bold crystals of menthol. The total recovery of menthol in the first step is around 70% . The time cycle for first step is around 6-7 days. In the second step, menthol flakes mixed with certain proportion of mint oil kept under temperature control for about 25 days. The mother liquor (conc. Mint oil ) is a bye product and can be used again till decolourisation of oil occurs. Total recovery of bold menthol crystals is about 50 % | |
| Description : Colorless, hexagonal or needle like crystals on infused massed crystalline powder | |
| Characteristics : | |
Appearance : Colorless crystal | |
| Specifications : | |
| Optical Rotation : (-) 49° to (-) 51° Residue on evaporation : Less than 0.05% | |
USES: | |
| In pharmaceutical, confectionery and flavoring industry | |
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