Cetane number of coal-derived diesel
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This post was last edited by jordan569 on 2013-1-6 21:27. What are the quality parameters of diesel produced through direct coal liquefaction, such as its density and cetane number? . Note # ) # # , . hcbbs
The cetane number is around forty-something, lower than that of FTO
Reply to 2# heatwave1976: Is the cetane number determined by a machine or calculated?
I’ve seen a lot of information; it seems there are over 70 of them!
The cetane number is generally between 42 and 47, while the density of diesel is usually in the range of 845–855; these values are primarily determined by the degree of hydrogenation
Reply to 5# lxh3350: The density of our company’s diesel is approximately between 880-920 Kg/m3, and its cetane number is around 36-40
Reply to 6# niujiali: Both coal-derived oil (directly) and diesel obtained from the hydrogenation of coal tar have relatively low cetane numbers, ranging from 30 to 40, and they also have a high density; the key factor here is the reaction conditions. To obtain diesel with low density and high cetane number, further saturation of the benzene ring and ring opening are required; in such cases, the side chains tend to break first, resulting in a reduced yield of diesel and increased yields of gases and liquefied gases. Even with the use of better catalysts for diesel modification, mild cracking reactions still occur, affecting the diesel yield, and the overall hydrogen consumption increases by 1–2 units. Different companies have varying requirements for diesel fuel, and it is also necessary to conduct calculations to determine whether further processing or the addition of cetane improvers is more cost-effective.
We are engaged in the hydrogenation of coal tar; the cetane number of diesel is around 35–40. Despite several adjustments to the process conditions, the cetane number has not increased yet
Directly liquefied aromatics have a high content, so their cetane number is likely to be low. The key factor is the degree of hydrogenation; diesel produced by Fischer-Tropsch synthesis can achieve a cetane number of over 70, but its density and flowability at low temperatures are not satisfactory, and its energy density is also low. Therefore, it is best to use a mixture of directly liquefied diesel and indirectly liquefied diesel.