Process for producing food grade wax

Details Process for producing food grade wax Process for producing food grade wax

2006-10-31

2006-10-31

Nguyen, Tam M. (Department: 1764)

Mineral oils: processes and products

Chemical conversion of hydrocarbons

With preliminary treatment of feed

C208S088000, C208S143000, C208S229000, C208S209000, C208S228000, C208S213000

Reexamination Certificate

active

07128828

ABSTRACT:
A process for producing food grade wax which contains exceedingly low levels of nitrogen, sulfur and aromatic compounds. A waxy feedstock is firstly hydrotreated in a first hydrogenation zone to reduce the level of contaminants such as sulfur, nitrogen and aromatic compounds, and the resulting effluent from the first hydrogenation zone is introduced into a hot, high pressure stripper and contacted with a hot, hydrogen-rich stripping gas to remove ammonia and hydrogen sulfide. The stripped, hot liquid hydrocarbons are removed from the bottom of the hot, high-pressure stripper to further reduce the concentration of aromatic compounds by being hydrogenated in a second hydrogenation zone containing a platinum or palladium catalyst.

REFERENCES:
patent: 5068484 (1991-11-01), James, Jr. et al.
patent: 5082551 (1992-01-01), Reynolds et al.
patent: 5114562 (1992-05-01), Haun et al.
patent: 5980729 (1999-11-01), Kalnes et al.

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