The present invention provides a method for the production of a metal halide adduct of S.sub.4N.sub.4, in particular a specific copper adduct of S.sub.4N.sub.4, for the visualisation of a print on an object, in particular a fingerprint on a metal object. The present invention also provides a method and apparatus for visualising a print on an object, using S.sub.2N.sub.2 obtained from a metal halide adduct of S.sub.4N.sub.4.

A method for preparing a compound having the following formula (IV): R.sub.2(SO.sub.2)NLi(SO.sub.2)F (IV), the method including a step a) of reacting a sulphamide having the following formula (A): R.sub.0(SO.sub.2)NH.sub.2 (A) with at least one sulphur-containing acid and at least one chlorinating agent, the step a) being carried out: at a temperature between 90? C. and 130? C., and at a pressure which is strictly greater than 7 bar (absolute).

A method for preparing a compound having the following formula (IV): R.sub.2(SO.sub.2)NLi(SO.sub.2)F (IV), the method including a step a) of reacting a sulphamide having the following formula (A): R.sub.0(SO.sub.2)NH.sub.2 (A) with at least one sulphur-containing acid and at least one chlorinating agent, the step a) being carried out: at a temperature between 90? C. and 130? C., and at a pressure which is strictly greater than 7 bar (absolute).

Provided is a titanium-containing oxide powder whose main component is a titanium-containing oxide represented by Li.sub.4Ti.sub.5O.sub.12 or Ti.sub.1?X/2Nb.sub.2O.sub.7?X (0?X<2), the titanium-containing oxide powder containing the titanium-containing oxide particles and a solvate ionic liquid, the solvate ionic liquid comprising a Li salt and an organic solvent.

A process for recycling of a mixed acid containing nitrosyl sulfuric acid and sulfuric acid to obtain nitric acid and sulfuric acid, the process including adding (i) a dilute nitric acid to (ii) the mixed acid comprising nitrosyl sulfuric acid and sulfuric acid to effect the decomposition of the nitrosyl sulfuric acid and to obtain (iii) a liquid phase and (iv) a gaseous phase, adding steam to the liquid phase to separate (v) a purified sulfuric acid, and evaporate (vi) a mixture of concentrated nitric acid and nitrogen oxides, cooling the gas phase and the mixture of nitric acid and nitrogen oxides in order to separately obtain (vii) a purified nitric acid condensate and (viii) nitrogen oxides, absorbing nitrogen oxides (viii) in water to obtain dilute nitric acid (ix), and optionally, introducing at least part of the obtained dilute nitric acid (ix) into the process.

The present invention provides a method for producing a bis (fluorosulfonyl) imide alkali metal salt by a reaction of a mixture containing bis (fluorosulfonyl) imide and an alkali metal compound is provided. According to this method for producing a bis (fluorosulfonyl) imide alkali metal salt, a total of weight ratios of the bis (fluorosulfonyl) imide, the alkali metal compound and the bis (fluorosulfonyl) imide alkali metal salt to an entire reacted mixture is not less than 0.8, after the reaction.

A lithium bis(fluorosulfonyl)imide salt, wherein, after dissolving in water to form an aqueous solution, the aqueous solution has a pH of between 4 and 8, in particular at a temperature of 25 C., and the uses thereof in Li-ion batteries. Also, a lithium bis(fluorosulfonyl)imide salt, including a content of H+ ions of between 0.08 ppb and 0.80 ppm, between 0.08 ppb and 0.63 ppm or between 0.25 ppb and 2.53 ppb.

A lithium bis(fluorosulfonyl)imide salt, wherein, after dissolving in water to form an aqueous solution, the aqueous solution has a pH of between 4 and 8, in particular at a temperature of 25 C., and the uses thereof in Li-ion batteries. Also, a lithium bis(fluorosulfonyl)imide salt, including a content of H+ ions of between 0.08 ppb and 0.80 ppm, between 0.08 ppb and 0.63 ppm or between 0.25 ppb and 2.53 ppb.

Provided is a novel imidic acid compound having a divalent anion useful as a pharmaceutical intermediate, an agrochemical intermediate, an acid catalyst, a battery electrolyte or an antistatic agent. The imidic acid compound is a divalent imidic acid compound represented by the following general formula (1) or (2). ##STR00001##
[In formulae (1) and (2), R.sup.1 to R.sup.3 represent a fluorine atom or an organic groups selected from a linear or branched C1-10 alkoxy group, a C2-10 alkenyloxy group, a C2-10 alkynyloxy group, a C3-10 cycloalkoxy group, a C3-10 cycloalkenyloxy group and a C6-10 aryloxy group, and wherein a fluorine atom, an oxygen atom or an unsaturated bond may also be present in the organic group. M.sup.1 and M.sup.2 represent protons, metal cations or onium cations.]

Provided is a novel imidic acid compound having a divalent anion useful as a pharmaceutical intermediate, an agrochemical intermediate, an acid catalyst, a battery electrolyte or an antistatic agent. The imidic acid compound is a divalent imidic acid compound represented by the following general formula (1) or (2). ##STR00001##
[In formulae (1) and (2), R.sup.1 to R.sup.3 represent a fluorine atom or an organic groups selected from a linear or branched C1-10 alkoxy group, a C2-10 alkenyloxy group, a C2-10 alkynyloxy group, a C3-10 cycloalkoxy group, a C3-10 cycloalkenyloxy group and a C6-10 aryloxy group, and wherein a fluorine atom, an oxygen atom or an unsaturated bond may also be present in the organic group. M.sup.1 and M.sup.2 represent protons, metal cations or onium cations.]