Nalco Chemical Company

Other

Sanjay R Srivatsa

Robert L Wetegrove

Bhupati R Bhattacharyya

Robert R Patzelt

Edwin C Zuerner, Jr

Michael L Dwyer

A method of removing impurities from water which comprises treating these impurity-containing waters with a few parts per million of a water-soluble polymer containing a major portion of Diallyldimethyl Ammonium Chloride and ether.

Ampholytic diallyldimethyl ammonium chloride (DADMAC) copolymers and

A perturbed feedback control system for a process. Inputs to the process include a feed stream and a manipulated variable. The manipulated variable is controlled by a feedback controller. Measurements of a parameter measured 'downstream' of the process are taken periodically and fed back to the controller. The feedback controller generates a control response on the basis of a comparison of the two most recent values of the downstream parameter. The comparison is made by calculating a perturbed set point which includes the values of the downstream parameter taken at the two most recent sampling periods. In a specific embodiment, the perturbed set point also includes measurements of the most recent and preceding values of the manipulated variable. A control response is applied to the manipulated variable by the feedback controller based on the value of the perturbed set point. The control system has been applied to optimize the feed rate of chemicals for sludge dewatering on a twin belt filter press.

Control system for a process

A method for recovering oil from a waste oil emulsion or sludge where the waste oil emulsion is heated and chemicals are added to obtain oil-water resolution, which includes conducting bottle and beaker tests on waste oil emulsion samples to obtain a trend which depicts a drop in viscosity as a function of the type and dosage of chemical added, and apparatus for utilizing the waste oil emulsion viscosity trend in the operation of a waste oil cooker or recovery vessel to add type and dosage of chemicals.

Method and apparatus for recovering oil from waste oil emulsion

A process is provided for enhancing oil recovery from an oily sludge containing a solid phase, an oil phase and a water phase by adding a positively charged latex flocculant to such sludge and immediately thereafter adding a chemical emulsion breaker which is negatively charged or nonionic, while controlling the proportions of said flocculant and said emulsion breaker to cause the entrapped oil phase to detach from the floc surface of the adsorptive solids and go into the water phase, and mechanically separating the oil from the solids and water.

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Naperville, IL, United States of America

Sanjay R Srivatsa