Calcium sulfamate

Calcium sulfamate and magnesium sulfamate are used effectively as a stiffening promoter of concrete and hydrauHc cement (see Cement). 

Calcium dihydrogen diphosphate CaH4N20eS2 4H2O Calcium sulfamate CaH408P2 H2O... 

Before a 1/1 /70 FDA ban (rescission proposed in early 1990), cyclamate noncaloric sweeteners were the major derivatives driving cycloliexylamine production. The cyclohexylsulfamic acid sodium salt (39) [139-05-9J and mote thermally stable calcium cyclohexylsulfamic acid (40) [139-06-1] salts were prepared from high purity cyclohexylamine by, among other routes, a reaction cycle with sulfamic acid. 

Aldehydes form addition products with sulfamic acid salts. These are stable ia neutral or slightly alkaline solutions but are hydroly2ed ia acid and strongly alkaline solutions. With formaldehyde, the calcium salt of the methylol (hydroxymethyl) derivative [82770-57-8], Ca(02SNHCH20H)2, is obtained as a crystalline soHd. 

Phethenylate sodium Ammonium chloride Cyclofenil Methionine Ammonium sulfate Aminobenzoic acid Fibrinolysin Ammonium sulfamate Cyclamate calcium Ammonium thiocyanate Acetazolamide Clonidine HCl Tolonidine nitrate 2oxazo lamina d-Amphetamine Tanphetamin Ampicillin Mezlocillin Talampicillin... 

Calcium/magnesium carbonate/hydroxide and calcium phosphate can be removed by using 5 to 15% hydrochloric acid at 140 to 150 °F, by recirculating tetrasodium EDTA at 200 to 300 °F, or by 7 to 10% sulfamic acid at 140 to 150 °F. The temperature may need to be a little higher to start the dissolution process. 

C. Sulfamates prepared from weak bases form acidic solutions, whereas those prepared from strong bases produce neutral solutions. The pH of 5 wt % solution of ammonium sulfamate is 5.2. Crystals of ammonium sulfamate deliquesce at relative humidity of 70% and higher. Both ammonium sulfamate [7773-06-0] and potassium sulfamate [13823-30-2] hbemte ammonia at elevated temperatures and form the corresponding imidodisulfonate (12). Inorganic sulfamates are quite water-soluble, except for the basic mercury salt. Some relative solubilities of sulfamates at 25°C in 100 g of water are ammonium, 103 g sodium, 106 g magnesium, 119 g calcium, 67 g barium, 34.2 g zinc, 115 g and lead, 218 g. The properties of a number of sulfamates may be found in the literature (see Table 5). 

Low-pH cleaners are typically used to address calcium carbonate scale and iron oxide deposition. These cleaners are usually formulated using only acid, such as acetic, hydrochloric, or sulfamic. Figure 13.5 shows the effects of temperature and pH on the removal of calcium carbonate from a membrane.7 As the figure shows, lower pH, and higher temperatures are more effective at restoring permeate flow than higher pH and lower temperatures. 

The chemical structure of the most important nonnutritive sweeteners is shown in Figure 11-4. Saccharin is available as the sodium or calcium salt of orthobenzosulfimide. The cyclamates are the sodium or calcium salts of cyclohexane sulfamic acid or the acid itself. Cyclamate is 30 to 40 times sweeter than sucrose, and about 300 times sweeter than saccharin. Organoleptic comparison of sweetness indicates that the medium in which the sweetener is tasted may affect the results. There is also a concentration effect. At higher concentrations, the sweetness intensity of the synthetic sweeteners increases at a lower rate than that which occurs with sugars. This has been ascribed to the bitter-... 

In a 1.5-1. reaction flask provided with a reflux condenser and a drying tube filled with calcium chloride are placed 97 g. (1 mol) of dry pulverized sulfamic acid and 417 g. (2 mols) of dry pulverized phosphorus(V) chloride. The reactants are thoroughly mixed, and the flask is immersed in a steam bath. After about 20 minutes, hydrogen chloride gas begins to be evolved, and after a minimum of about 35 minutes the reaction mixture becomes liquid. Evolution of gas continues for at least 45 minutes when it has ceased, the flask is evacuated to a pressure of 20 mm. Hg and the phosphorus oxychloride (phosphoryl chloride), POCI3, formed during the reaction is distilled from the mixture at a bath temperature of 80°. 

Hydrofluoric add Sulfamic acid Dissolves silicate deposits Dissolves calcium salts As an additive to HCI (as ammonium bifluoride) As an additive to HCI ... 

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