Wash Detergent Phosphate, Powder

Soil-Grease, oil, salt, water deposits, clay, particulates, road film 

Surface-Painted metal surface. Polymeric Application Method-High pressure spray Manufacture-Dry blend/Agglomeration 

Dissolve in stock tank and meter into wash system. Composition B can be utilized in high pressure spray carwash systems and supplies adequate soil removal. 

Surface-Painted metal surface. Polymeric Application Method High pressure spray (700-1400 psi ) Manufacture-Mix tank with propeller stirrer Composi ti on wt% 

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Phospha.tes, Pentasodium triphosphate [7758-29-4] sodium tripolyphosphate, STPP, Na P O Q, is the most widely used and most effective builder in heavy-duty fabric washing compositions (see also Phosphoric acid and phosphates). It is a strong sequestrant for calcium and magnesium, with a p c of ca 6, and provides exceUent suspending action for soils. Because of its high sequestration power, it also finds extensive appHcation in automatic-dishwashing detergents. Sodium tripolyphosphate forms stable hydrates and thus aids in the manufacture of crisp spray-dried laundry powders. 

Alternatively, finely powdered zeolites may be used in detergent powders as a builder since zeolite particles smaller than 10 pm do not stick to clothing. Formerly, sodium polyphosphates (Section 7.7) were used extensively as detergent builders to tie up the Ca2+ and Mg2+ in hard water as soluble complexes (or as a precipitate that washes away). However, many communities ban phosphate detergents because of pollution problems (Sections 7.7 and 9.6), thus creating a major new market for zeolites. 

Fig. 8-52. Analysis of condensed phosphates in detergents. - Separator column IonPac AS7 eluent 0.07 mol/L HN03 flow rate 0.5 mL/min detection photometry at 330 nm after reaction with ferric nitrate injection 50 pL of a 0.1% washing powder solution.

Figure 10.184 Analysis of condensed phos- volume 50 pL sample 0.1% washing powder phates in a detergent. Separator column Ion- solution peaks (1) orthophosphate, (2) pyro-Pac AS7 eluent 0.07 mol/L HNO3 flow rate phosphate, (3) sulfate, and (4)...

A corresponding law, or a statutory order, obliges the detergent industry to reduce the quantity of phosphate in washing powders to about half, in 2 steps. It remains to be seen whether this is sufficient to suppress the eutrophication in our waters [37]. 

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