Nalco Chemical Company

Joseph P Maniscalco

Ronald J Allain

David G Braithwaite

Donald G Ries

An improved process for producing hexamethyldisilane by reacting ether solutions of methyl Grignard with a crude mixture of chloromethyl disilanes, the improvement which comprises obtaining higher yields and simplified purification of HMDS by the use of a mixed solvent system composed of tetrahydrofuran and the diethyl ether of tetraethylene glycol.

Preparation of hexamethyldisilane (HMDS) from chloromethyldisilanes

A process of producing tetramethyldisilane by reacting tetramethyldichlorodisilane with a reducing mixture of NaH and NaBH.sub.4 in the presence of a complexing ether such as the diethyl ether of tetraethylene glycol.

Preparation of tetramethyldisilane from 1,2-tetramethyldichlorodisilane

An improved process for producing tetramethyldisilane by Lewis acid catalyzed redistribution of hexamethyldisilane with a crude mixture of methylchlorodisilane which comprises the distillation of the mixed redistributed product with collection of a middle distillate cut containing at least 95% pure tetramethyldichlorodisilane.

Preparation of 1,2-tetramethyldichloro-disilane from hexamethyldisilane

This invention outlines a process to beneficiate carnallite ores in such a way as to obtain anhydrous MgCl.sub.2 of sufficient purity to be used as feed for an electrolysis cell producing magnesium metal. Commercially acceptable potassium chloride as also recovered. The organic solvents and the anhydrous ammonia used to obtain the beneficiation of these carnallite materials are recovered for recycle in the process.

Preparation of useful MgCl.sub.2. solution with subsequent recovery of

A method of producing tetramethyltin which comprises the steps of:

Preparation of tetramethyltin from a magnesium-tin alloy

In a process of producing anhydrous magnesium chloride of the type comprising:

Polyethers to obtain anhydrous magnesium chloride

A method of beneficiating a mixed salt mineral ore containing potassium and magnesium sulfates and/or their hydrates which allows the recovery of anhydrous magnesium chloride and the simultaneous recovery of commercially acceptable potassium sulfate.

Preparation of a MgCl.sub.2 solution for Nalco's MgCl.sub.2 process from

Novel compounds and the use of these compounds in inhibiting corrosion and scale in open cooling systems containing ferrous materials which are: ##STR1## These compounds are prepared by a carboxylic acid-phosphonic acid interchange in the general reaction involving .alpha.-phosphorus containing carboxylic acids as reactants:

Reaction of .alpha.-phosphorus containing carboxylic acids with

Novel compounds and the use of these compounds in inhibiting corrosion and scale in open cooling systems containing ferrous materials which are: ##STR1## These compounds are prepared by a carboxylic acid-phosphonic acid interchange in the general reaction involving .alpha.-phosphorous containing carboxylic acids as reactants:

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Sugar Land, TX, United States of America

Joseph P Maniscalco