China V Diesel Quality Standards?

[DeDaniella]

China V diesel standards specify the following parameters: color 3.5, oxidation stability 2.5mg/100ml, sulfur content 0.001%, acidity 7mgKOH/100ml, 10% distillation residue carbon content 0.3%, no mechanical impurities, polycyclic aromatic hydrocarbons content 11%, flash point (closed cup) 55°C, 50% evaporation temperature 300°C, 90% evaporation temperature 355°C, 95% evaporation temperature 365°C. Below is additional information: 1. Anti-knock quality: Determined by cetane number. Low cetane number makes fuel difficult to ignite with long ignition delay and unstable engine operation, while higher cetane number provides better ignition performance, shorter ignition delay, more uniform combustion and smoother operation. Excessively high cetane number may cause incomplete combustion and black smoke. 2. Evaporation characteristics: Evaluated by distillation range and flash point. Lower 50% evaporation temperature indicates more light fractions in the fuel, making diesel engines easier to start. Lower 90% and 95% evaporation temperatures indicate fewer heavy fractions. National standards specify that -35 and -50 grade light diesel must have flash points not lower than 45°C. 3. Flow characteristics: Evaluated by viscosity, pour point and cold filter plugging point. Too low viscosity may cause leakage between high-pressure fuel pump plunger and barrel, while too high viscosity makes fuel supply difficult. 4. Corrosiveness: Evaluated by sulfur compounds and sulfur content. Stability is evaluated by total insolubles and 10% distillation residue carbon content.