Abstract: Disclosed is a process for the recovery of nickel from nickel-containing wastes, which comprises the steps of slurrying the waste with a nickel brine solution; reacting the slurry by addition of an oxidizing agent solution, followed by anhydrous hydrogen chloride to obtain a nickel chloride containing reaction mixture; and, filtering the reaction mix to obtain the nickel chloride solution.

Abstract: In a process for the preparation of acetone cyanohydrin by the reaction of acetone and hydrocyanic acid in the presence of a sodium hydroxide catalyst, the method of removal of corrosion inducing sodium ion during the purification of the crude acetone cyanohydrin, involving the steps of (1) passing a cooled crude acetone cyanohydrin feedstream through a cationic ion exchange resin to remove substantially all of the sodium ion; (2) regenerating exhausted ion exchange resin; (3) acidifying the substantially sodium ion-free crude feedstream to a pH of 1.5-2.0 to stabilize said crude acetone cyanohydrin; (4) feeding the acidified substantially sodium ion-free crude feedstream to a first concentrator; (5) removing overhead, from the first concentrator, unreacted acetone and sending the bottoms from said first concentrator to a second concentrator; and (6) removing purified acetone cyanohydrin as bottoms from the second concentrator and recycling the overhead for further generation of acetone cyanohydrin.

Abstract: A continuous process for the preparation of acrylic and methacrylic acid esters by conventional esterification, where sufficient substantially anhydrous product ester is added to the esterification reactor to satisfy the ester/alkanol and ester/water azeotropes, the low boiling azeotropes are recovered, thereby removing crude product ester, unreacted alkanol and water of esterification from the esterification reactor, while leaving substantially all the high-boiling unreacted acrylic or methacrylic acid in the reactor.

Abstract: A lead-free rigid polyurethane foam which cures rapidly at low temperatures and which comprises an organic isocyanate, a polyol, a catalyst, a foaming agent, a cell-size regulator and a primary polyoxyalkylene amine.

Abstract: The marked dusting characteristics of dry powder alkali-metal salts of alpha-olefin sulfonates are substantially inhibited by incorporating therein minor proportions of alkanolamine salts of alpha-olefin sulfonates.

Abstract: Amine-terminated polyetherurethane-urea polymers in a solvent, as for instance, isopropanol, toluene, and mixtures thereof, are chain-extended with as little as about 0.1 and up to 9 percent, by weight, based on the amine terminated polyetherurethane-urea, of a polyepoxide, such as a polyepoxide of p,p'-isopropylidenediphenol, of a phenolformaldehyde resin, epoxidized soybean oil, diglycidyl phthalate, and the like, to produce films, coatings, adhesives, and caulking having improved hydrolytic stability, and other improved physical properties.