Formic acid, calcium salt

FORMIC ACID, CALCIUM SALT see CAS250 FORMIC ACID, CHLORO-, 2-CHLOROETHYL ESTER see CGU199... 

Calcium diformate Calcium formate Calcium formate (Ca(HC02)2) Calcoform EINECS 208-863-7 Formic acid, calcium salt HSDB 5019 Latibon Mravencan vapenaty. As feed additive and as silage additive binder tor fine-ore briquets. Crystalline powder d = 2.02 soluble in H2O insoluble in EtOH. Bayer AG. 

Synonyms Formic acid calcium salt Empirical C2H2Ca04 Formula (HCOO)2Ca... 

Formic acid calcium salt. See Calcium formate... 

Calcium Formate. [CAS 54-4-17-2]. CatCHCM . while solid, solubility at 0 C 13.90 g, al 40 C 14.56 g, at 8t)"C 15.22 g of anhydrous salt per 100 g saturated solution, formed by reaction of calcium carbonate or hydroxide and formic acid. Calcium formate, when heated with a calcium salt of a carboxylic acid higher in the scries, yields an aldehyde. 

Formaldehyde sodium bisulfite adduct Formaldehyde sodium sulfoxylate. See Sodium formaldehyde sulfoxylate Formal glycol. See 1,3-Dioxolane Formalin. See Formaldehyde Formamide, 1,1 -azobis-. See Azodicarbonamide Formic acid, aluminum salt. See Aluminum formate Formic aldehyde Formol. See Formaldehyde p-FormyInitrobenzene. See p-Nitrobenzaldehyde Fossil flour. See Diatomaceous earth Silica, fumed Fossil wax. See Ozokerite Franklin. See Calcium carbonate Free crystalline silica. See Quartz Freon 113. See Trichlorotrifluoroethane P-D-Fructofuranosyl-a-D-glucopyranoside. See Sucrose P-D-Fructofuranosyl-a-D-glucopyranoside benzoate. See Sucrose benzoate P-D-Fructofuranosyl-a-D-glucopyranoside monohexadecanoate. See Sucrose palmitate... 

The reaction of formate salts with mineral acids such as sulfuric acid is the oldest iadustrial process for the production of formic acid, and it stiU has importance ia the 1990s. Sodium formate [141-53-7] and calcium formate [544-17-2] are available iadustriaHy from the production of pentaerythritol and other polyhydric alcohols and of disodium dithionite (23). The acidolysis is technically straightforward, but the unavoidable production of sodium sulfate is a clear disadvantage of this route. 

Isothermal a—time curves were sigmoid [1024] for the anhydrous Ca and Ba salts and also for Sr formate, providing that nucleation during dehydration was prevented by refluxing in 100% formic acid. From the observed obedience to the Avrami—Erofe ev equation [eqn. (6), n = 4], the values of E calculated were 199, 228 and 270 kJ mole"1 for the Ca, Sr and Ba salts, respectively. The value for calcium formate is in good agreement with that obtained [292] for the decomposition of this solid dispersed in a pressed KBr disc. Under the latter conditions, concentrations of both reactant (HCOJ) and product (CO3") were determined by infrared measurements and their variation followed first-order kinetics. 

In the production of formic acid, a slimy of calcium formate in 50% aqueous formic acid containing urea is acidified with strong nitric acid to convert the calcium salt to free acid, and interaction of formic acid (reducant) with nitric acid (oxidant) is inhibited by the urea. When only 10% of the required amount of urea had been added (unwittingly, because of a blocked hopper), addition of the nitric acid caused a thermal runaway (redox) reaction to occur which burst the (vented) vessel. A small-scale repeat indicated that a pressure of 150-200 bar may have been attained. A mathematical model was developed which closely matched experimental data. 

Other preparations of 2-methyl-3-phenylpropionaldehyde include the pyrolysis of a mixture of the calcium salts of 2-mothyl-3-phenylpropionie acid and formic acid,3 and the... 

Formic acid solution reacts as follows 11) with hydroxides, oxides, carbonates, to form formates, e g., sodium formate, calcium formate, and with alcohols to form eslers (2) with silver of ammonio-silver nitrate to form metallic silver (3) with ferric formate solution, upon heating, to form red precipitalc of basic ferric formate (4) with mercuric chloride solution to form mercurous chloride, white precipitate and (SI with permanganate lin the presence of dilute H-SOj) to form CO and manganous salt solution. Formic acid causes painful wounds when it ennies in contact with the skin. At IhO C. formic acid yields CO plus H . When sodium formate is heated in vacuum at 300°C. H- and sodium oxalate are formed. With concentrated ll.SOj heated, sodium formate, or other formate, or formic aeid. yields carbon monoxide gas plus water. Sodium formate is made by healing NaOH and carbon monoxide under pressure at 2I0 C. 

Various organic acids such as sorbic, benzoic, propionic, acetic and formic acids, have been widely used as preservatives and are normally used as the corresponding sodium, potassium or calcium salts. Such methods are seldom used where the stored produce is destined for human consumption. 

Essentially, all primary skin irritants include acids, alkalis, metals, salts, and solvents. Among organic acids one may include acetic acid, acrylic acid, carbolic acid, chloroacetic acid, formic acid, lactic acid, oxalic acid, and salicylic acid. Among inorganic acids one may list arsenious acid, chromic acid, hydrochloric acid, hydrofluoric acid, nitric acid, phosphoric acid, and sulfuric acid. Alkalis include butylamines, ethylamines, ethanolamines, methylamines, propylamines, and triethanolamine. One also may include ammonium carbonate, ammonium hydroxide, calcium carbonate, calcium cyanamide, calcium hydroxide, calcium oxide, potassium carbonate, potassium hydroxide, sodium carbonate (soda ash), sodium hydroxide (caustic soda), and sodium silicate. 

Hexaldehyde has been prepared from caproic acid by passing it over zinc dust at 300°, by reaction with amylene at 300°. in the presence of thorium oxide, by passing it over manganous oxide at 300-360 with two volumes of formic acid, and by distillation of the calcium salt with calcium formate. It has also been prepared by heating a-hydroxyheptoic acid or better a-acetoxyheptoic acid, and by the reaction of ethyl orthoformate with -amylmagnesium bromide. ... 

The old method of heating the calcium salts of formic and a second carboxylic acid for aldehyde formation has been modified by the use of a catalytic decomposition technique. By this scheme, the acid vapors are passed over thorium oxide, titanium oxide, or magnesium oxide at 300° or the acids are heated under pressure at 260° in the presence of titanium dioxide. In the latter procedure, non-volatile acids can be used. With aliphatic acids over titanium oxide, reaction occurs only when more than seven carbon atoms are present, the yields increasing with increase in the molecular weight (78-90%). Aromatic-acids having halo and phenolic groups are converted in high yields to aldehydes, e.g., salicylaldehyde (92%) and p-chlorobenzaldehyde (8S>%). Preparation of a thorium oxide catalyst has been described (cf. method 186). 

A general CE method using an imidazole-formic acid buffer has been validated [22] for analysis of the potassium counter-ion of an acidic drug. Sodium was used as the internal standard. The method was also applied to calcium, magnesium and lithium salts. The method can also be applied to the characterisation and identification of ionic raw materials and excipients such as sodium saccharin and sodium phosphate buffers. 

This acid is obtained when 3-nitrobenzoxazolone-5-arsinic acid (p. 437) is heated with 2N sodium hydroxide solution. It crystallises from water in bright yellow spikes containing 1 molecule of water, almost insoluble in glacial acetic acid or alcohol, soluble in concentrated hydrochloric acid and in formic acid. The calcium salt crystallises in laminsc. 

This is obtained in a similar manner to the preceding carbamide. It crystallises from formic acid solution in microscopic, woolly needles. The sodiv/m, magnesium, calcium and barium salts are known. ... 

Formic acid, the simplest of the fatty acids, is found free in nature as just stated, the name for ants, viz., Formicidce, giving the name to the acid. It is a liquid, B. P. ioi° with a very sharp odor and an irritating or blistering effect upon the skin. It yields well crystallized salts of the metals especially of copper, lead and calcium. It may be prepared by the general methods given above, e.g. ... 

From acids.—A general method of synthesis of both aromatic aldehydes and ketones is from the calcium salts of acids. The reaction is of the same nature as that which takes place in the like synthesis of aliphatic aldehydes and ketones (Part I, p. 133). To obtain the aldehyde the calcium salt of formic acid is heated with the calcium salt of the aromatic acid. 

Formic acid, like formaldehyde, has good disinfectant properties. It exists in honey preventing it from being spoilt easily. It is also used in textile dying and leather tanning. In addition, formic acid is a starting material in the production of fertilizers, rubbers and plastics. Plus the calcium salt of formic acid is a good softener when dissolved in water. 

Electrodialysis uses stacks of pairs of anion- and cation-exchange membranes in deionizing water and in recovery of formic, acetic, lactic, gluconic, citric, succinic, and glutamic acids from their sodium and potassium salts in fermentation broths.114 This may have an advantage over processes that involve purification through calcium salts. Electrodialytic bipolar membranes have been used to recover concentrated mineral acids from dilute solution.115 They can be used to convert sodium chloride to hydrogen chloride and sodium hydroxide in a process that avoids the use of chlorine.116 Soy protein has been precipitated by... 

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