Patent GB-459078-A (GB)
Title: A process for the production of alkyl ester salts
IPC: C07C305/06
Filed: 1935-06-27
Abstract: Paraffin wax containing material obtained from petroleum distillates which have been treated with solvents to reduce the aromatic constituents, is converted by a heat treatment into unsaturated compounds which are then reacted with inorganic oxygen containing polybasic acids, and the resulting acid esters neutralized with alkaline reacting agents.  The paraffin wax containing material may be cracked in the liquid and/or vapour phase and the cracked products purified, e.g. with sulphuric acid or aluminium chloride.  The cracked products may be fractionated before being treated with the inorganic polybasic acids, such as sulphuric or phosphoric acid.  The resulting mixture of inorganic acid, neutral and acid esters and polymers is preferably freed from inorganic acid by treatment with a small amount of water or Glauber's salt solution, to which a little alcohol or ether may be added.  The neutral esters may be extracted from solutions of the salts of the acid esters by means of solvents such as, benzene, gasoline, pentane or hexane, or alternatively, by addition of water to the mixture of esters, the neutral esters together with polymers may be separated as an oily layer.  The separated neutral esters may be heated with alkali to convert them into salts of acid alkyl esters, but the whole olefine absorption product, preferably after removal of the inorganic acid may be treated with alkali to obtain a combined yield of the salt.  The products have wetting and emulsifying properties and may be used for treating textiles and leather, e.g. as levelling agents and for greasing leather.  Their use for dispersing paraffin, tar and asphalt, and as spray oils, flotation agents and for preparing finely divided pigments is referred to.  In an example, a waxy product obtained from a lubricant distillate which has been refined with furfurol, is cracked, and the resulting olefines treated with sulphuric acid.  The free sulphuric acid is removed from the product which is then further diluted to separate polymers.  The resulting solution of alkylsulphuric acid is neutralized with organic bases obtained from acid tar and a portion extracted with benzol and the remainder with carbon bisulphide to extract neutral esters.  Both aqueous solutions after extraction are evaporated to yield salts of alkyl sulphuric acid.  Specification 459,079 is referred to.  The Specification as open to inspection under Sect. 91 comprises also the production of alkylester salts from any unsaturated compounds obtained by subjecting hydrocarbon material containing at least 10 per cent of paraffin wax to a heat treatment.  Mineral and tar oils rich in paraffin wax, ozokerite, slop wax and filter press wax are mentioned as suitable raw materials.  Pyrosulphuric and pyrophosphoric acids may be used for reaction with the olefines. This subject-matter does not appear in the Specification as accepted.ALSO:Ester salts, stated to have emulsifying properties are prepared by treating with alkaline reacting agents, the esters obtained from inorganic oxygen - containing polybasic acids and olefines which are produced by the heat treatment of paraffin wax containing material derived from petroleum distillates whose content of aromatic constituents has been reduced by treatment with solvents. In an example, a waxy product obtained from a lubricant distillate which has been treated with furfural is cracked, and the resulting olefines are treated with sulphuric acid and neutralized after removal of free acid.  The use of phosphoric acid for absorption of the olefines is mentioned. Paraffin, tar, asphalt and other insoluble substances may be dispersed by means of the products.