GB156138A - Process for the extraction of montan wax from bituminous coal - Google Patents

Abstract

Montan wax is extracted from bituminous coal by highly dispersing the latter in hot water, preferably in the presence of small quantities of emulsifying agents, such as 1-10 per cent of caustic soda, soaps, lysalbinic or protalbinic acid, alkaline protein compounds, gluten or its decomposition products, or sugar, or 1-5 per cent of solvents such as benzene, benzine, pyridine, acetone, or alcohol. The dispersion is effected in a colloid mill such as that described in Specification 155,836. After removal of coarse impurities by filtration, the dispersion is treated with small quantities of salts or acids and allowed to settle. The montan wax is obtained from the resulting sludge by heating with a solvent, by distilling in superheated vapours of solvents, or by salting out.ALSO:Montan wax is extracted from bituminous coal by highly dispersing the latter in hot water, preferably in the pressure of small quantities of emulsifying agents, such as 1-10 per cent of caustic soda, soaps, lysalbinic or protalbinic acid, alkaline protein compounds, gluten or its decomposition products, or sugar, or 1-5 per cent of solvents such as benzene, benzine, pyridine, acetone, or alcohol. The dispersion is effected in a colloid mill such as that described in Specification 155,836. After removal of coarse impurities by filtration, the dispersion is treated with small quantities of salts or acids and allowed to settle. To obtain the montan wax from the resulting sludge, the latter may be either heated in an autoclave to 110-130 DEG C. with 10-30 per cent of a solvent of the wax, or it may be dried and distilled, preferably in vacuo, with superheated vapours of solvents, such as petroleum, aniline, toluene, xylene, or benzene, with or without superheated steam, or the wax may be salted out from the sludge by heating the latter to 110-130 DEG C. with from 2-5 times its volume of a concentrated solution of a neutral salt or with a substance like naphthalene which dissolves montan wax while hot. The wax obtained by the first process may be repurified by solution in benzene or its homologues, benzine, aniline, quinoline, alcohols, acetone, or chlorinated hydrocarbons.