Dewaxing laboratory

Endewax [National Chemical dewaxing] A process for dewaxing heavy petroleum fractions by treatment with a catalyst which converts the long-chain hydrocarbons to shorter ones. The catalyst is a ZSM-5 -type zeolite in which some of the aluminum has been replaced by iron. Developed by the National Chemical Laboratory, Pune, India, and piloted in 1991. 

Sections incorrectly dewaxed. Prepare new sections and deparaffinize according to standard laboratory protocol, using fresh xylene or xylene substitute. 115-121... 

Preparations said to contain Ci from culture filtrates of either T, koningii or F. solani, when added to culture filtrates of various pseudo-cellulolytic organisms, were able to confer the capacity for extensive solubilization of dewaxed cotton fibers 41), Thus the purification of Cl factors and elucidation of their function have concerned several laboratories during the past few years. 

Bifunctional zeolite catalysts such as platinum loaded acid zeolite catalysts are applied in several petroleum refinery operations, designated as hydroconversion processes isomerisation of light n htha, iso-dewaxing and hydrocracking of heavy fractions [4]. Most experimental investigations in academic laboratories are typically performed with pure model components or simple mixtures thereof as feedstock, and using reaction conditions under which the hydrocarbon compounds are in the vapor phase. Industrial hydroconversion processes are mostly run under three phase, or even in some cases under liquid phase conditions and with feedstocks that are extremely complex mixtures of large numbers of different hydrocarbon compounds [4]. 

The Mobil process for catalytic dewaxing by selective hydrocracking of wax molecules arose from that company s development work on zeolites and the discovery of the remarkable selectivity exhibited by these catalysts some 20 years prior to first commercialization. In 1960 Weise and Frilette, of the then Socony Mobil Research and Development Laboratories,1 reported that n-decane cracked readily to lighter paraffins over the sodium form of a zeolite known as 13X, whereas the bulkier molecules, a-pinene and isopropylbenzene, underwent no reaction (Figure 10.1). 

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