Is there medium-temperature coal tar? What is the difference from low-temperature coal tar?

I am also studying this issue, with no conclusion yet. It seems that medium- and low-temperature coal tar is the term commonly used for it, and the lignite carbon and semi-coke produced seem to be intended for the same downstream markets, with little difference between them. But I heard from a colleague that the raw materials for the two are different, so I am hesitant. I hope the expert can provide the components of medium-temperature coal tar. Thank you~~

The control temperatures for medium and low temperatures are different. Low temperatures are used primarily to obtain coal tar that contains fewer polycyclic compounds compared to coal tar produced at higher temperatures; however, the carbon in this case appears as powder and cannot be converted into coke, so it is essentially wasted. Medium temperatures are generally used in combination with low temperatures to produce semi-coke, while the resulting coal tar has a low degree of utilization. Our laboratory is currently working on developing ways to utilize it; however, due to confidentiality issues with the technical teams involved, we are unable to disclose any details on this matter.

Low temperature (450-650 degrees) Medium-low temperature (600-800) Medium temperature (1000 degrees) High temperature (above 1000 degrees)

This post was last edited by Wise Ming on 2010-2-5 at 09:33. The so-called medium- and low-temperature coal tar refers to the abbreviation for a production process in which coal tar generated during coking or anthracite production is subjected to lightening and modification (such as coal tar hydrogenation), with different products being obtained at various operating temperatures. 　　Usually, the low temperature (normal temperature) is around 40 degrees, and the product obtained from cutting is gasoline ； The medium temperature is around 180–200 degrees, diesel ； High-temperature ranges are divided into two segments: 350–380 degrees for paraffin oil, and 550–580 degrees for residue oil ； Products at high temperatures are collectively referred to as “asphalt”. Further down, due to its viscous and fragile properties, it can only be used as an auxiliary fuel for coking on-site. 　　Different types of coal and different tar compositions are suitable for various coal tar hydrogenation processes. Generally, medium- and low-temperature coal tar hydrogenation processes are more economical. There are not many domestic engineering companies that possess expertise in these reaction processes and catalysts; Luoyang Dirac performs well in this area, with several medium- and low-temperature coal tar hydrogenation units in operation. Several domestic engineering companies are involved in the development of high-temperature coal tar hydrogenation units, such as Shengbang and Changling.

We carry out coal tar hydrogenation (at medium and low temperatures), which is done using the by-products of semi-coke from northern Shaanxi. What you mentioned seems to refer to the distillation temperature of our hydrogenated products, right?

6# Xida Chemical: What are the quality specifications for the tar derived from semi-coke coal in northern Shaanxi?