Patent GB-574716-A (GB)
Title: Improvements in or relating to detergent compositions containing sulphonated organicmaterials
IPC: C11D3/065
Filed: 1943-05-03
Abstract: 574,716. Cleansing compositions. COLGATEPALMOLIVE-PEET CO. May 3, 1943, No. 6936. Convention date, May 19, 1942. [Class 91] Sulphated or sulphonated organic detergents are rendered non-corrosive towards metals by adding thereto an amount of water-soluble inorganic phosphate less than 3 per cent. by weight of the sulpho compound. A large number of sulpho compounds are listed and it is stated that they may have been neutralized with organic or inorganic bases. Phosphates mentioned are tetraphosphates, triphosphates, pyrophosphates and primary, secondary and tertiary orthophosphates of the alkali metals and ammonium, and these may be added at any stage in the manfacture of the detergent compositions. Where the sulpho compound is neutralized with an inorganic base, at least part of the phosphate may be formed in situ by adding phosphoric acid at some stage prior to the neutralization, but, in general, any compound which breaks down or reacts with the sulpho compound to provide the water-soluble inorganic phosphate may be added. The final product may be made up in liquid, solid, flake or powder form, and, if desired, in combination with soaps and other adjuvant materials. In examples, (a) glycerine is sulphated with fuming sulphuric acid in the presence of pyrophosphoric acid and the product is reacted with a mixture of coconut oil and tallow and then neutralized with caustic soda solution. There is thus obtained a mixture of the sodium salts of coconut oil and tallow fatty acid diglyceride monosulphates with sodium sulphate, containing an amount of sodium pyrophosphate about 15 per cent. of the weight of the sulpho compounds. The mixture is then mixed with aqueous ethanol and allowed to separate into two layers, one layer being found to contain the sulpho compounds together with about 1.9 per cent of pyrophosphate, (b) a mixture of the sodium salt of coconut oil fatty acid monbglyceride monosulphate and sodium sulphate, prepared according to Specification 477,521, is dissolved in water and then disodium orthophosphate is dissolved in the solution, (c) the Edeleanu extract of a naphthene base mineral oil is sulphonated with oleum and the sulphonated product obtained in powder form in accordance with Specification 506,337. This powder is dissolved in water and then sodium tetraphosphate is dissolved in the solution. The Specification as open to inspection under Sect. 91 comprises also the subject-matter of Specification 585,662. It also contains an additional example in which white mineral oil of paraffinic base is treated with a gaseous mixture of chlorine and sulphur dioxide, and the mineral oil sulphonyl chlorides thus formed are extracted with liquid sulphur dioxide. Pyrophosphoric acid is added to the sulphonyl chlorides, and.then excess caustic soda to hydrolyse the sulphonyl chlorides and neutralize acid. The product is neutralized with sulphuric acid and then additional sodium sulphate dissolved therein. The solution is then dried to a flaky solid. This subject-matter does not appear in the Specification as accepted.