Abstract: A process for obtaining a hydroxy-ended glycidyl azide polymer (GAP). The process consists in reacting polyepichlorohydrin (PECH) with a metallic azide in the presence of an organic solvent having a parameter of solubility comprised between 21 and 23.5 (MPa).sup.1/2 such as DMA or NMP. The use of any of the solvents mentioned sharply reduces the reaction time needed for substituting azide groups for the chlorine present in the PECH. Said reaction times can be less than 4 hours when NMP is used or less than 6 hours when DMA is used. The GAP thus obtained having a functionality equal to or above 2 can be used as energetic bonding agent in the formulation of solid propellants for rockets.

Abstract: Process for the isolation and purification of free acids, starting from their salts, by electrodialysis which involves the use of:i) an electrolytic cell of four compartments, in which the two compartments adjacent to the two electrodes are separated from the central compartments by means of cationic membranes (2) and the central compartments are separated from one another by means of an anionic membrane (1); or, alternatively,ii) a module formed by an array of cells of 4 compartments separated from one another by alternating anionic membranes and cationic membranes.By means of this process, the simultaneous presence of the isolated free acids and their salts in the same compartment is prevented, which increases their purity. A large number of acids and amino acids can be isolated and purified. In a preferred embodiment, the purification and isolation of IDA is described.