Disodium hydrogen phosphate

Sodium dihydrogen phosphate-disodium hydrogen phosphate [39413-44-0]... 

THPC—Amide—PoIy(vinyI bromide) Finish. A flame retardant based on THPC—amide plus poly(vinyl bromide) [25951-54-6] (143) has been reported suitable for use on 35/65, and perhaps on 50/50, polyester—cotton blends. It is appUed by the pad-dry-cure process, with curing at 150°C for about 3 min. A typical formulation contains 20% THPC, 3% disodium hydrogen phosphate, 6% urea, 3% trimethylolglycouril [496-46-8] and 12% poly(vinyl bromide) soUds. Approximately 20% add-on is required to impart flame retardancy to a 168 g/m 35/65 polyester—cotton fabric. Treated fabrics passed the FF 3-71 test. However, as far as can be determined, poly(vinyl bromide) is no longer commercially available. 

Peroxide-Ketazine Process. Elf Atochem in France operates a process patented by Produits Chimiques Ugine Kuhhnaim (PCUK). Hydrogen peroxide (qv), rather than chlorine or hypochlorite, is used to oxidize ammonia. The reaction is carried out in the presence of methyl ethyl ketone (MEK) at atmospheric pressure and 50°C. The ratio of H202 MEK NH2 used is 1 2 4. Hydrogen peroxide is activated by acetamide and disodium hydrogen phosphate (117). Eigure 6 is a simplified flow sheet of this process. The overall reaction results in the formation of methyl ethyl ketazine [5921-54-0] (39) and water ... 

In addition, buffer salts such as disodium hydrogen phosphate may be used to prevent the pH of the aqueous phase falling during polymerisation. Small amounts of an anti-foam agent may be employed to reduce frothing when discharging from the vessel at the end of the polymerisation process. 

The trisodium salt is best made by careful dehydration of an equimolar mixture of hydrated disodium hydrogen phosphate and sodium hydrogen phosphite at 180° ... 

The following procedure is described in U.S. Patent 2,837,464 from a solution of 3 grams of yeast extract (Difco) in 3.0 (iters of tap water containing 13.2 grams of potassium dihydrogen phosphate and 26.4 grams disodium hydrogen phosphate (pH of the solution, 6.9)... 

Deoxy-D-jcylo hexose 6-(dihydrogen phosphate) (21) has also been synthesized (2) the reaction sequence makes use of 3-deoxy l 2,5 6-di-O-isopropylidene D-galactofuranose (16), a compound that can be easily prepared from D-glucose (2, 60). The mono-isopropylidene derivative (17) formed by partial hydrolysis of the di-ketal is converted into the 6-tosylate (18) by reaction with one molar equivalent of p-toluenesulfonyl chloride. From this the epoxide (19) is formed by reaction with sodium methoxide. Treatment of the anhydro sugar with an aqueous solution of disodium hydrogen phosphate (26) leads to the 6-phosphate (20)... 

For the bromination of benzoic acid, the rate increased more rapidly than [H+] at high mineral acid concentrations and apparently depended on the acidity function ho rather than [H+]. Neutral salts such as disodium hydrogen phosphate, lithium and sodium sulphates also increased the rate due either to a positive salt... 

Write formulas for each of the following compounds (a) calcium hydrogen carbonate, (b) disodium hydrogen phosphate, (c) sodium dihydrogen phosphate, and (d) calcium dihydrogen phosphate. 

Harrison, Tarr and Hibbert96 investigated the production of levan from sucrose by the action of Bacillus subtilis Cohn and B. mesentericus Trevisan. Nutrient solutions containing 10% carbohydrate, 0.1% peptone, 0.2% disodium hydrogen phosphate and 0.5% potassium chloride were incubated at 37° for six days. Levan formation occurred only with sucrose and raffinose, and not with melezitose, lactose, maltose, D-xylose, D-glucose or D-fructose. It was therefore suggested that only those carbohydrates with a terminal D-fructofuranose residue were satisfactory substrates for levan formation. 

Pd2+ salts are useful reagents for oxidation reactions of olefins. Formation of acetaldehyde from ethylene is the typical example. Another reaction is the formation of vinyl acetate by the reaction of ethylene with acetic acid (16, 17). The reaction of acetic acid with butadiene in the presence of PdCl2 and disodium hydrogen phosphate to give butadienyl acetate was briefly reported by Stem and Spector (110). However, 1-acetoxy-2-butene (49) and 3-acetoxy-l-butene (50) were obtained by Ishii and co-workers (111) by simple 1,2- and 1,4-additions using PdCl2/CuCl2 in acetic acid-water (9 1). 

Neomycin forms an insoluble complex when added to aqueous solutions of corticosteroid phosphates. To overcome this incompatibility, McGinty and Brown304 incorporated disodium hydrogen phosphate in the opthalmic formulation. The mechanism by which the complexation is prevented has not yet been fully determined. 

A glycol monophosphate has been synthesized by opening up the appropriate olefin oxide with disodium hydrogen phosphate ... 

Figure 3.16 Chromatogram of hydantoins on polymethacrylate stationary phase. Conditions columns, Shodex RSPak DE613 (methacrylate gel) eluent, 1 1 mixture of 0.033 M disodium hydrogen phosphate and potassium dihydrogen phosphate flow rate, 2.0 ml min-1 detection, UV 210 nm temperature, 50 °C. Compounds 1, R = (CH2)2C02H 2, R = CH2OH 3, R = H 4, R = CH3 and 5, R = C2H5.

Excipients Cellulose, disodium hydrogen phosphate, hydroxypropyl cellulose, hydroxypropyl methylcellulose, lactose, mannitol, sodium lauryl sulfate, etc. 

Trisodium phosphate (TSP), Na3P04, is used as a paint stripper and grease remover. Disodium hydrogen phosphate, Na2HP04, can be found in some laxatives. Draw a Lewis structure for each molecule, and determine the shape of the phosphate ion,... 

Disodium hydrogen phosphate dihydrate (25.5 g), potassium dihydrogen phosphate (9.0 g), ammonium chloride (1.0 g) and sodium chloride (0.5 g) were dissolved in water and the volume adjusted to 900 mL. The solution was sterilized by autoclaving (121 °C, 20 min) and allowed to cool to room temperature. Magnesium sulfate (240.5 mg), kanamycin (50 mg), thiamine (10 mg) and glucose (5 g) were dissolved in water and adjusted to 100 mL volume. This mixture was sterilized by filtration through a 0.2 pm filter and added to the salt solution. 

Dipotassium hydrogen phosphate trihydrate (15.9 g) potassium dihydrogen phosphate (4.0 g) disodium hydrogen phosphate dodecahydrate (7 g) ammonium sulfate (1.2 g) ammonium chloride (0.2 g) magnesium sulfate heptahydrate (1 g) yeast extract (5 g )... 

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