Abstract: The invention relates to a new process for preparing nitrogen trifluoride which finds extensive application in the technology of semiconductors, high energy lasers, and chemical vapor deposition. Nitrogen trifluoride is prepared by the fluorination of urea or its decomposition products with elemental fluorine in anhydrous hydrogen fluoride at a temperature of from −20° C. to 0° C. and the molar ratio of fluorine to the starting compounds of not over 3. The concentration of the starting compounds in anhydrous hydrogen fluoride is preferably 20-50% by weight. The proposed process is explosion-safe and gives a product with maximum content of nitrogen trifluoride and minimum concentration of admixtures, with the yield of up to 90%.

Abstract: Disclosed is a process of producing a highly homogeneous cellulose solution, in which a mixture of powdered cellulose with polyvinyl alcohol powder is fed in conjunction with concentrated liquid NMMO into a kneader or an extruder to produce the highly homogeneous cellulose solution, or into the kneader to produce a swollen cellulose/polyvinyl alcohol paste and the paste thus produced is moved into the extruder to produce the highly homogeneous cellulose solution. The cellulose solution is extruded through a nozzle into a cellulose fiber. The process is advantageous in that the highly homogeneous cellulose solution can be rapidly and inexpensively produced because the cellulose solution is produced without a vacuum distillation step or separate swelling step, and formation of fibrils is prevented, thereby cellulose fibers with excellent flexibility and strength are produced from the cellulose solution.

Abstract: Topical gelled compositions comprising an optional drug dispersed within a polymer matrix, methods of producing the same and treatments with the complex.