International Minerals & Chemical Corp.

Pitman-moore, Inc.

Ray E Barker

Vikram P Mehrotra

Steven J Dougherty

Robert J Urban

Earl E Borchert

A method for recovering a recombinant protein from a protein solution containing high molecular weight containing proteins by directly adding amine or quaternary ammonium compounds to the solution in amounts sufficient to selectively precipitate the high molecular weight protein contaminants. The high molecular weight precipitates are removed and the solution is further processed to remove low molecular weight contaminating proteins and other non-protein contaminants. The recombinant protein is subsequently recovered and further processed to produce a protein composition suitable for its intended use.

Method for recovering recombinant proteins

High purity fused silica particles are made by heating relatively low density silica flour in a high temperature flame. The silica flour feed rate, flame temperature, and collection zone temperature are adjusted to produce an aggregate of surface-bonded fused silica particles. The aggregate is shaped like a honeycomb and can be ground autogenously without introducing impurities into the final product.

Process for producing high purity fused quartz powder

A method of decolorizing wet process phosphoric acid containing organic color-imparting impurities is provided. The process includes treating the acid with a strong oxidant at a temperature in the range of about 50.degree. to about 150.degree. C. by slowly adding the oxidant to the acid over a period of time of at least about 3 hours. The oxidized acid then is contacted with a regenerable activated carbon, preferably in a packed column, in order to adsorb the oxidized color-imparting impurities.

Method of decolorizing wet process phosphoric acid

An improved process for stabilizing wet process phosphoric acid is described in which the acid is treated with pressurized carbon dioxide and then is aged so as to enhance the rate of post-precipitation.

Growing community of inventors

Terre Haute, IN, United States of America

Ray E Barker