Nalco Holding Company

About: Nalco Holding Company is a based out in . It is known for research contribution in the topics: Corrosion & Aqueous solution. The organization has 2375 authors who have published 3056 publications receiving 51473 citations.

Method for injecting treatment chemicals using a constant flow positive displacement pumping apparatus

Abstract: A method for providing a continuous injection of a constant amount of a desired treatment chemical into a flowing stream is described This method insures that the concentration of the desired treatment chemical is maintained at a relatively uniform concentration throughout the flowing stream A constant flow pumping apparatus for providing the continuous injection of the treatment chemical is also described The pumping apparatus includes multiple positive displacement pumps which are driven by a cam such that the rates of displacement of the displaceable members of the positive displacement pumps is a constant positive value This insures that the pumping apparatus provides a constant flow of the treatment chemical being injected into a flowing stream Providing a uniform concentration of a treatment chemical in a flowing stream maximizes the benefit of the treatment chemical Conventional positive displacement pumps for injecting treatment chemicals provide intermittent injection of the treatment chemical such that sections of the flowing process stream have no concentration of the treatment chemical This reduces the benefit of the treatment chemical and may prevent it from providing any benefit at all

NOx Removal with Combined Selective Catalytic Reduction and Selective Noncatalytic Reduction: Pilot-Scale Test Results

Abstract: Pilot-scale tests were conducted to develop a combined nitrogen oxide (NOx) reduction technology using both selective catalytic reduction (SCR) and selective noncatalytic reduction (SNCR). A commercially available vanadium- and titanium-based composite honeycomb catalyst and enhanced urea (NH2CONH2) were used with a natural-gas-fired furnace at a NOx concentration of 110 ppm. Changes in SNCR chemical injection temperature and stoichiometry led to varying levels of post-furnace ammonia (NH3), which acts as the reductant feed to the downstream SCR catalyst. The urea-based chemical could routinely achieve SNCR plus SCR total NOx reductions of 85 percent with less than 3 ppm NH3 slip at reductant/NOx stoichiometries ranging from about 1.5 to 2.5 and SCR space velocities of 18,000 to 32,000 h−1. This pilot-scale research has shown that SNCR and SCR can be integrated to achieve high NOx removal. SNCR provides high temperature reduction of NOx followed by further removal of NOx and minimization of NH3 slip by a ...

Fluid, formulation, and method for dust control and dewatering of particulate materials

Abstract: An aqueous, coal dust suppression fluid comprising one or more surfactants and at least one high terpene-containing natural oil. The coal dust suppression fluid can be used in a formulation of water dosed with the aqueous dust suppression fluid for the abatement of coal dust. A method is described for the abatement of coal dust using the formulation.

Method of reducing circulation fluid loss using water absorbing polymer

Abstract: 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.

Substituted succinic acid compounds and their use as chelants

Abstract: Substituted succinic acids and salts thereof having the formula: ##STR1## where R is H or ##STR2## and M is H, alkali metal, or an amine, are useful as chelants and stabilizers for heavy metal ions.