英语翻译The hydrochloric acid employed in this invention is that

英语翻译
The hydrochloric acid employed in this invention is that commercially available concentrated hydrochloric acid which has a concentration of 36 to 37 weight percent.It is within the scope of this invention to use as a partial replacement up to but no more than 50 percent by weight of hydrochloric acid,an equal weight amount of concentrated sulfuric acid or phosphoric acid.The sulfuric acid is considered to be that commercially available acid having a concentration of about 96 percent by weight.The phosphoric acid,which is available commercially in different concentrations,for the purpose of this invention is considered to have a concentration of 75 percent by weight.Since the amount of water which is included in the cleaner concentrate varies from 24 to 76 percent,the hydrogen ion concentration of the mineral acids is not critical.Generally,the use of sulfuric acid and/or phosphoric acid is not favored except for economic reasons.On a weight percent basis the acid cleaner of this invention contains from about 15 to about 40 weight percent and more preferably,the acid content will be from about 20 to about 30 weight percent.
The second component of the composition is an organic acid preferably selected from the group consisting of oxalic,tartaric,citric acids or mixtures thereof in an amount from about 1 to about 6 weight percent and more preferably in an amount from about 2 to about 4 weight percent.
The particular surfactants employed in the invented composition in addition to having a cleaning effect also exhibit unusual thickening properties for this composition which were entirely unexpected.Therefore the surfactants of this invention are doubly critical.The non-ionic surfactant is present in an amount from about 7 to about 23 weight percent of the final composition and more preferably in an amount from about 12 to 18 weight percent.