Nalco Chemical Company

Ansell L Reid

Ronald J Allain

David G Braithwaite

Henry A Grichuk

Water absorbent polymers provided, in the form of a thixotropic hydrocarbon gel, demonstrate controlled water absorption. This property enables improved usage of such polymers in the reduction of the loss of circulation fluid or as a viscous sweep in the drilling of subterranean wells.

Method of reducing circulation fluid loss using water absorbing polymer

Polymer composition comprising phosphorous-containing gelling agent and

A two-step process for removing boron impurities from aqueous solutions of magnesium chloride which comprises treating these solutions with more than 3 moles of methanol in the presence of an acid catalyst to form trimethyl borate and then removing the trimethyl borate and excess methanol from such solutions by means of distillation and then extracting from the thus-treated solutions any remaining boron compounds by means of a hydrocarbon liquid. The hydrocarbon liquid extraction step may be used prior to the methanol treatment.

Two-step process for removing boron compounds from aqueous solutions of

A method for removing boric acid and salts therefrom from ethylene glycol-magnesium chloride solutions which contain at least 100 ppm of boron which comprises reducing the pH of such solutions below 7 and then adding thereto at least 3 moles of methanol based on the amount of boric acid or salt thereof present in said solution and then subjecting the thus-treated ethylene glycol-magnesium chloride solution to distillation at a temperature sufficient to remove trimethyl borate-methanol therefrom, thereby reducing the level of boron in the starting solution to not more than 35 ppm.

Boron removal from ethylene glycol-magnesium chloride solutions

Gasoline containing an additive comprising about 70% by weight of methylcyclopentadienyl manganese tricarbonyl and about 30% of a composition selected from the group consisting of methylcyclopentadiene dimer compounds, hydrogenated methylcyclopentadiene dimer compounds, and the alcohols of methylcyclopentadiene dimer compounds, said additive being present in the gasoline in an amount sufficient to increase its anti-knock effectiveness.

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Sugar Land, TX, United States of America

Ansell L Reid