Coking benzene    CAS:T2283-93

 appearance<0.003g,     density=0.876～0.880g/cm³
distillation range<0.8℃  acid wash colour ≤0.20   bromine number≤0.15g/100ml
cryatallizing point ≥ 5℃    CS2≤0.006g/100ml        thiophen ≤ 0.06g/100ml

Coking toluene      CAS: T2284-94

appearance<0.003g,     density=0.861～0.868g/cm³    distillation range≤0.9℃
i  acid wash colour ≤0.20        bromine number≤0.2g/100ml

Coking xylene   CAS:T2285-93

 appearance<0.003g,     density=0.857～0.866g/cm³
initil distillation point ≥137. 5℃    final distillation point ≤140.5℃  acid wash colour ≤0.6 
 neutral test :neutral       non visible insoluble  water at room termperature
copper corosion test ≤ 2#

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