Patent GB-707550-A (GB)
Title: Suppression of acidic gas evolution
IPC: C10M177/00
Filed: 1950-12-27
Abstract: The suppression of the evolution of acidic gases from substances or compositions which in normal conditions of storage gradually give off such gases is effected by incorporating with the substances or compositions 0.001-20 per cent. by weight of a condensation product of a primary amine with an aldehyde or a ketone or a condensation product of an aromatic aldehyde, a heterocyclic aldehyde or formaldehyde with ammonia.  Included among the condensation products of primary amines with aldehydes or ketones are the autocondensation products of amino - aldehydes and amino - ketones.  Substances mentioned which give off acidic gases are potassium cyanide, the sulphides of Na, K, Ba, Sr, Mg and NH4, the hydrosulphides of Na, K, Li, Ca, Ba, Sr, Mg and NH4,and the polysulphides of Na, K, Ca, Sr, Mg and NH4, while compositions mentioned are the solutions of these substances.  Other substances mentioned are the sulphur-containing antioxidants and extreme pressure agents, suitable for addition to lubricating oils, described in Specifications 462,146, 519,288, 555,053, 590,973, 610,056 and 645,267, and in U.S.A. Specifications 1,963,489, 2,012,446, 2,061,008, 2,088,193, 2,133,828, 2,137,410, 2,142,998, 2,161,566, 2,162,207-8, 2,164,151, 2,169,634, 2,193,331, 2,197,781, 2,202,641, 2,211,798, 2,218,447, 2,226,334, 2,228,252, 2,253,227-8, 2,260,303, 2,274,022, 2,301,918, 2,307,183, 2,316,078, 2,316,081, 2,316,085-9, 2,383,494, 2,383,497, 2,388,199, 2,393,934, 2,427,272, 2,441,331, 2,449,933-4, 2,450,405, 2,459,090 and 2,459,113.  Other compositions mentioned are the blends of sulphur-containing lubricating oil additives with other substances described in Specifications 644,043 and 645,267 and in U.S.A. Specifications 2,028,257, 2,231,301, 2,252,133, 2,296,037, 2,315,072, 2,373,094, 2,419,584, 2,442,915 and 2,455,668.  Further compositions mentioned are mineral lubricating oil compositions containing these sulphur-containing additives or additive blends.  In the examples, a pinene-P2S5 reaction product is stabilized by incorporating therein a condensation product (a) of benzaldehyde with ammonia, aniline, p-t-amylaniline, o - toluidine, 2 - ethylhexylamine, decylamine, tetradecylamine, octadecylamine, and Armeen C (a fatty amine), Armeen CD, Armeen SD, Armeen TD or Rosin Amine D (a primary amine prepared from rosin), (b) of furfuraldehyde with ammonia, aniline or o-toluidine, (c) of salicylaldehyde with 2-ethylhexylamine or 2,2-diaminopropane, (d) of cinnamaldehyde or thenylalhehyde with o-toluidine, (e) of heptanaldehyde with tetradecylamine or decylamine, (f) of 2-ethylhexanaldehyde with 2-ethylhexylamine, Armeen CD or o-toluidine, (g) of acetophenone, benzophenone, acetylthiophene or methylisobutyl ketone with o-toluidine, (h) of acetylthiophene or methyl isobutyl ketone with 2-ethylhexylamine or (i) of formaldehyde with ammonia.  In further examples, mineral lubricating oil containing pinene-P2S5 reaction product, with or without water or barium wax benzene sulphonate is stabilized by incorporating therein a condensation product of benzaldehyde with aniline or o-toluidine.  In additional examples, aqueous solutions of hydrogen sulphide, sodium hydrosulphide or calcium hydrosulphide are stabilized by incorporating therein a condensation product of benzaldehyde with o-toluidine.ALSO:The suppression of the evolution of hydrogen sulphide from depilatory preparations, such as depilatory creams, containing metallic sulphides or hydrosulphides, which in normal conditions of storage give off hydrogen sulphide, is effected by incorporating with the preparations 0.001-20 per cent by weight of a condensation product of a primary amine with an aldehyde or a ketone or a condensation product of an aromatic aldehyde, a heterocyclic aldehyde or formaldehyde with ammonia.  Included among the condensation products of primary amines with aldehydes or ketones are the autocondensation products of amino-aldehydes and amino-ketones.  The sulphides of Na, K, Ba, Sr and Mg and the hydrosulphides of Na, K, Li, Ca, Ba, Sr and Mg are mentioned. Tests are described in which aqueous solutions of sodium or calcium hydrosulphide are stabilized by incorporating therein a condensation product of benzaldehyde with o-toluidine.