Urea Dewaxing and the BP Catalytic Process

Dewaxing of paraffinic lube stocks is an essential step in the production of lubricants which will remain fluid and permit machinery to operate at winter temperatures. The next two chapters outline the technologies that have been developed for this purpose (except solvent dewaxing, which was discussed in Chapter 6). These processes reflect the historical development of dewaxing chemical knowledge during this century, first using chemical separation processes and more recently, chemical conversion. 

This and the next chapter provide details of four processes for dewaxing  

Prior to discussion of these processes, it is worthwhile understanding the composition of the petroleum wax to be separated or converted. That is the subject of the following section. 

---