Mobil Oil Corporation

L Deane Rollmann

David O Marler

Kirk D Schmitt

Dominick N Mazzone

Dennis H Hoskin

Larry Arthur Green

Gerald L Shoemaker

Robert A Bradway

The present invention provides a hydrogenation process for producing diamondoid compounds from a petroleum feedstream containing multiple ring naphthenes comprising the steps of:

Two-stage process for producing diamondoid hydrocarbons

A polycyclic aromatic is contacted with an alkyl-substituted single ring aromatic, such as toluene, o-, m- or p-xylene or mesitylene, over a catalyst comprising a zeolite, such as zeolite beta, USY or ZSM-5 to alkylate the polycyclic aromatic. The polycyclic aromatic can be a fused polynuclear aromatic, e.g. phenanthrene, or an assembly of two or more cyclic systems, e.g. biphenyl. The polycyclic aromatic can also include carbocyclic systems such as fluorene and naphthalene or heterocyclic systems such as benzothiophene and dibenzothiophene. The polycyclic aromatic can be derived from a cycle oil, coker gas oil, extract of lubricant solvent refining or crude distillate fraction. The transalkylating agent can be derived from a reformate, pyrolysis gasoline or coker naphtha.

Process for making alkylated polycyclic aromatics

The accumulation of inorganic mineral scale such as barium sulfate in oil field formations and/or production equipment is inhibited by adding to formation fluid or produced fluid a scale formation inhibitory amount of a polyalkoxy sulfonate of the general formula

Use of polyalkoxy sulfonate surfactants for inhibition of scale formation

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Moorestown, NJ, United States of America

L Deane Rollmann