Chemical Process
Black liquor is converted into white liquor by

Selective liquid extraction
Multi-effect evaporation only
Evaporation and burning the concentrate followed by causticisation of products
Extractive distillation

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Chemical Process
Nylon 66 is so named because the

Number of carbon atoms between two nitrogen atoms are 6
Number of nitrogen atoms between two carbon atoms are 6
Average degree of polymerisation of the polymer is 1966
Polymer was first synthesised in 1966

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