Patent GB-429423-A (GB)
Title: Improvements in or relating to means for preventing the foaming of liquids
IPC: B01D19/04
Filed: 1933-10-23
Abstract: The formation of foam in liquids having strong foam forming properties, which are intended for further treatment or industrial application in which the formation of foam is undesirable, is prevented or reduced by incorporating one or more substantially waterinsoluble alcohols having more than 8, e.g. 9--30, preferably 9--18 carbon atoms in the molecule, e.g. saturated or unsaturated alcohols or alcohol mixtures derived from or derivable from natural oils, fats and waxes, such as the alcohol mixture obtainable by reduction of coconut oil or coconut oil fatty acids, normal straight chain primary saturated and unsaturated alcohols such as lauric, myristic, cetyl, stearyl, ricinoleic and oleic alcohols, polyhydroxy alcohols such as dioxyoctodecene, or naphthenic alcohols containing more than 8 carbon atoms.  The alcohols may be employed in quite small amounts, e.g. 0,1 to 5 per cent by weight, and may be used in conjunction with small quantities, e.g. 1--3 per cent by weight, of dispersing agents, e.g. sulphonated fatty substances such as sulphonated fatty alcohols (sulphuric esters or true sulphonic acids) or their alkali or other soluble salts or esters, particularly those of normal straight chain primary alcohols having 8--18 carbon atoms in the molecule, e.g. octyl, oleic or lauric alcohol, sulphated or sulphonated oily or fatty acids or naphthenic acids, sulphonated esters of natural fats and waxes or turkey red oils, also soaps provided they are inert to the other ingredients.  The process is applicable to the treatment of glue solutions, of liquids which would tend to foam during distillation, particularly those obtained in the fermentation industry, e.g. dilute lactic acid, of masses for paper manufacture and of water for boilers. Experiments are described illustrating the effect on the foaming of a glue solution of the addition of coconut oil fatty alcohols, of oleic alcohol, of a mixture of lauric alcohol, the sodium salt of sulphonated lauric alcohol and paraffin oil, and of dioxyoctodecene (produced by reduction of castor oil).  In examples: (1) dilute lactic acid solution is concentrated by evaporation in vacuo after addition of oleic alcohol; (2) a solution consisting mainly of acetone and butanol, obtained by fermentation of maize, is distilled in vacuo after addition of lauric alcohol; (3) a similar solution obtained by fermentation of molasses is distilled in vacuo after addition of cetyl alcohol.  The Specification as open to inspection under Sect. 91 comprises the use of substantially water-insoluble alcohols in general, butyl alcohol being additionally specified.  This subject-matter does not appear in the Specification as accepted.ALSO:The formation of foam in glue solutions is prevented or reduced by incorporating one or more substantially water-insoluble alcohols having more than 8 carbon atoms in the molecule, with or without dispersing agents.  Experiments are described illustrating the effect on the foaming of a glue solution of the addition of coconut oil fatty alcohols, of oleic alcohol, of a mixture of lauric alcohol, the sodium salt of sulphonated lauric alcohol and paraffin oil, and of dioxyoctodecene.  The Specification as open to inspection under Sect. 91 comprises the use of substantially water-insoluble alcohols in general. This subject-matter does not appear in the Specification as accepted.