Abstract: The process is disclosed for the manufacture of briquettes in which an essentially solid fuel material such as hard coal, coke, soft coal, charcoal or more particularly, anthracite, and other coals of low volatility are mixed in the presence of polyvinyl alcohol and calcium oxide and/or magnesium oxide, as well as at least 1 percent by weight of water, and formed into briquettes. The calcium oxide is preferably caustic lime. The polyvinyl alcohol is preferably applied as an aqueous solution. The briquettes so formed are characterized by high initial crush resistance, i.e. the solidity shortly after the briquetting process, by high abrasion resistance, easy handling and, in the event that anthracite is employed, a carbon tar index of less than 50. The waste gases emitted during the burning of these briquettes have a distinctly reduced SO.sub.2 content.

Abstract: Fuel briquettes containing binding agents and additives, obtained by briquetting 80-99% by weight of an essentially solid fuel, 0.1-19% by weight of a natural or synthetic binding agent and 0.1-10% of a cationic polyurethane obtained by a monomeric aliphatic dihydroxy compound, which has at one of its two atoms bonding the two dihydroxy groups an aliphatic residue with minimum 10 carbon atoms, being reacted with a polyisocyanate and an aliphatic monomeric diol containing tertiary nitrogen which in the obtaining of the cationic polyurethane is rearranged into its ammonium phase, or obtained by reacting the monomeric aliphatic dihydroxy compound with a polyisocyanate and an appropriate aliphatic monomeric diol in which the nitrogen is present already in its ammonium state. The briquets are obtained by commingling and forming into briquets, in a known manner, the mentioned components.

Abstract: Fuel briquets containing binding agents and additives are obtained by briquetting of approximately 80 to 99% by weight of an essentially solid fuel, approximately 0.1 to 19% by weight of a natural or synthetic binding agent and approximately 0.1 to 10% by weight, calculated on a dry basis, of a cationic resin obtained by reacting polyamines with halohydrin.

Abstract: Organic compounds having active hydrogen are separated from heterogeneous mixtures of organic compounds, such as tar, which also contain organic compounds which do not have active hydrogen. The method involves preferential conversion of the active hydrogen compounds to soluble compounds by reaction with a reagent which is an alkene oxide or ethyleneimine, introducing a solvent for the soluble compounds whereby two phases are formed, and then separating the phases.