E.i. Dupont De Nemours and Company

Walter Vladimir Cicha

Leo Ernest Manzer

Leo E Manzer

V N Rao

Ronald James McKinney

Donald Keith Swanson

Alfred Waterfeld

Joseph Stuart Thrasher

Andreas Josef Kornath

Phosgene manufacturing process

A process suitable for producing high purity alkaline earth fluoride product is disclosed which involves (a) mixing (i) MgO, CaO, BaO, Mg(OH).sub.2, Ca(OH).sub.2, and/or Ba(OH).sub.2, (ii) NaOH, KOH and/or NH.sub.4 OH, and (iii) water, to form an aqueous slurry having a temperature of at least 20.degree. C. and an aqueous phase pH of at least 13; (b) adding fluosilicic acid, optionally adding additional water and optionally adding additional NaOH, KOH and/or NH.sub.4 OH to the slurry of (a) at a rate which maintains an aqueous phase pH of 11 or above, and in an amount to provide a molar ratio of Si: (Mg, Ca, and Ba) of at least 1:3.3, a molar ratio of (Na, K, and NH.sub.4):Si of at least 2:1, and a molar ratio of water:Si of at least 20:1, and to obtain a precipitate comprising an alkaline earth fluoride (MgF.sub.2, CaF.sub.2 and/or BaF.sub.2), and an aqueous solution of a soluble silicon anionic compound; and (c) recovering the alkaline earth fluoride product.

Alkaline earth fluoride manufacturing process

A process for producing sulfuryl chloride and/or thionyl chloride is disclosed which involves contacting a mixture comprising SO.sub.2 and Cl.sub.2 (e.g., at about 300.degree. C. or less) with carbon having an active metal content of less than 1000 ppm by weight and a high degree of oxidative stability (i.e., a weight loss of about 12%, or less, in the WVC Temperature Test as defined herein).

Process for producing oxochlorides of sulfur

A process is disclosed for preparing a perfluoroalkyl sulfonate of the formula R.sub.a MX.sub.b-c O.sub.g �(SO.sub.3).sub.d (R.sub.f).sub.e !.sub.c. This process involves reacting a reagent of the fonnula R.sub.a MX.sub.b O.sub.g and a second reagent of the formula R'.sub.x E�(SO.sub.3).sub.d (R.sub.f).sub.e !.sub.y, where

Perfluoroalkyl sulfonates, their preparation and use

A process for producing sulfuryl chloride and/or thionyl chloride is disclosed which involves contacting a mixture comprising SO.sub.2 and Cl.sub.2 (e.g., at about 300.degree. C. or less) with a silicon carbide catalyst having a surface area of at least 10 m.sup.2 .multidot.g.sup.-1.

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Newark, DE, United States of America

Walter Vladimir Cicha