Abstract: This invention pertains to the manufacture of polyurethane-urea elastomers formed by reacting a prepolymer of an organic polyisocyanate and a compound having at least two Zerewitenoff active hydrogen atoms with a chain extender comprising t-butylbenzenediamine. The utilization of t-butylbenzenediamine as an aromatic diamine chain extender imparts flexibility in the handling of reactable compositions due to an increase in pot life and imparts excellent tensile modulus to the resulting polymer.

Abstract: This invention relates to a polyamine composition suited for catalytically effecting reaction between organic polyisocyanate and an active hydrogen compound as measured by the Zerewitinoff method e.g. a polyol, a polyester polyol of polyether in the manufacture of urethane compositions.

Abstract: This invention relates to an improved process for reducing solute in a vapor stream and, particularly, to the adaption of this process in concentrating solutions in an evaporator wherein the solution is heated to volatilize solvent. The improvement for reducing solute in the vapor stream resides in (a) the utilization of a wire mesh mist eliminator pad having a wire diameter of from 0.001-0.05 inches, an interfacial area from 50-200 ft.sup.2 /ft.sup.3, a void space of about 90-99 percent and a packing thickness of 4-16 inches and (b) spraying a liquid through the mist eliminator pad, the liquid being sprayed uniformly over the surface of the mist eliminator pad at a rate of 0.6-2.5 pounds liquid per pound of vapor to provide a wetting rate of 0.1-0.25 gallons per minute per square foot of mist eliminator surface area. The process has been particularly advantageous in the multistage concentration of corrosive products particularly in the concentration of a 60-70% sulfuric acid solution to about 93 percent.

Abstract: This invention relates to an improved adiabatic process for separating hydrogen from mixed gas streams using hydridable materials as the absorbing medium. The improvement comprises utilizing a composite comprising a thermal ballast in admixture with the hydride material to absorb the heat of reaction and to aid in desorption. By virtue of the intimate contact of the ballast with the hydridable material rapid cycle times plus good bed utilization are achieved.

Abstract: This invention relates to an improvement in a process for producing ethanol by methanol homologation. The homologation is carried out by reacting methanol with hydrogen and carbon monoxide in a 1-2:1 mole ratio and a temperature of from about 175-230.degree. C. and a pressure of 2,000-10,000 psig in the presence of a cobalt catalyst represented by formulas I and II.

Abstract: This invention relates to an improvement in a process for purifying nitrogen trifluoride atmospheres generally contaminated with nitrous oxide, water, and dinitrogen difluoride. The improvement for extending adsorber life resides in reducing the dinitrogen difluoride content in the atmosphere to less than 0.03% by volume prior to passing the atmosphere through the adsorber.