GB695841A - Improvements in and relating to fuel oils - Google Patents

Abstract

A fuel oil composition which, on combustion in a furnace or internal combustion power plant, yields an ash which has a high melting point and thus does not adhere to or corrode the surfaces of the furnace or power plant, comprises a high ash residual fuel oil and a minor proportion of an oil-soluble organic compound of phosphorus. The high ash residual fuel oil is a liquid fuel having an ash content of at least 0.005 per cent when measured by method I.P.-4/44 of the Institute of Petroleum, having a viscosity of at least 100 seconds Redwood I at 100 DEG F and consisting of or containing a residual petroleum oil; in addition to residual petroleum oil, the high ash residual fuel oil may contain other liquid fuels such as distilled or cracked hydrocarbon fuel oils. In particular, the high ash residual fuel oil may be one which, on combustion, forms an ash containing a high proportion of vanadium and/or sodium compounds. The oil-soluble phosphorus compound may be added to the high ash residual fuel in bulk or it may be injected, either as such or as a solution in a suitable solvent, into the fuel oil supply lines to the burner or burners of a furnace or internal combustion power plant at a point before the burner or burners. Types of phosphorus compounds mentioned are (1) organic esters of oxyacids of phosphorus, such as the alkyl, aryl, alkaryl, aralkyl or cycloalkyl esters of the phosphoric or phosphorus acids, (2) organic derivatives of hydrides of phosphorus, such as the alkyl, aryl, alkaryl, aralkyl or cycloalkyl phosphines, (3) the phosphonium bases or salts thereof, (4) the alkyl, aryl, alkaryl, aralkyl or cycloalkyl phosphonic or phosphinic acids and salts or p esters thereof and (5) the alkyl, aryl, alkaryl, aralkyl or cycloalkyl phosphine oxides. Specific examples of phosphorus compounds are triphenyl phosphate or phosphite, tri-o, -m or p-cresyl phosphates or phosphites, tricumenyl phosphate, trixylenyl phosphate or phosphite, propyl diparacresyl phosphite, tributyl, triethyl or trioctyl phosphate or phosphite, isoamyl octyl phosphate, tri (4-ethylphenyl) phosphate, tri (4-tert. butyl-phenyl) phosphate, tri-2-naphthyl phosphate, tribenzyl phosphate, triphenylethyl phosphate, tricyclohexyl phosphate, tri (trichlorphenyl) phosphate, dilauryl, dicetyl or distearyl hydrogen phosphate, lauryl cetyl hydrogen phosphate, stearyl or lauryl dihydrogen phosphate, dibutyl, diphenyl or dicresyl hydrogen phosphate, tetradecane-1-phosphonic acid, 10-phenyl-decane-1-phosphonic acid, 2, 4-dimethyl-naphthalene-phosphonic acid, diphenylcresyl phosphonite, diphenyl phosphinic acid, ethyl-diphenyl phosphinite, phosphobenzene and triphenyl phosphine. The use of alkoxy phospho polysulphides is disclaimed. In the examples, commercial tricresyl phosphate or tributyl phosphite is added to high ash residual fuel oil