144-55-8 sodium hydrogen carbonate

Mineral Deposits Sodium hydrogen carbonate occurs naturally e.g. as the mineral nahcolite. Enormous deposits are to be found in the USA (reserves of ca. 30 10 t in Wyoming, Utah and Colorado), together with oil shale. 

Economic Importance The production of sodium hydrogen carbonate is much lower than that of sodium carbonate. The production in the USA in 1995 was 0.454 10 t being only ca. 5% of the sodium carbonate production and corresponding to 50% of the world production of 0.895 10 t. The capacity in the USA has expanded considerably in recent years and as a result production should increase by 2% per year in coming years. A plant for producing sodium hydrogen carbonate from natural deposits came on stream in the USA in 1991. 

Manufacture In the Solvay process sodium hydrogen carbonate is produced as an intermediate. Due to the high purity requirements of sodium hydrogen carbonate, it cannot, however, be obtained therefrom. It is produced by reacting filtered solutions of calcined sodium carbonate with pure carbon dioxide with cooling  

Sodium hydrogen carbonate precipitates out, which has to be dried e.g. in a plate dryer, to avoid back reaction. Manufacture of sodium hydrogen carbonate is mostly integrated into the manufacture of synthetic sodium carbonate. In the USA it is also produced from sodium carbonate from natural sources. 

Applications The most important application sector for sodium hydrogen carbonate is the food industry (e.g. production of baking powder), for which in the USA 33% was used in 1995. In addition it is used in the rubber and chemical sectors. Sodium hydrogen carbonate is also utilized in the manufacture of pharmaceuticals, fire extinguisher powder and animal feedstuff s, a strongly 

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Both of these chlorohydrins are converted to 1,2-dihydroxypropane by heating with solutions of sodium hydrogen carbonate when heated with solid sodium hydroxide they give 1,2-epoxypropane. U.S. production 1976 4400 tonnes. 

NH4. HCO3. CU and Na and the least soluble salt sodium hydrogen carbonate, is precipitated when ionic concentrations increase, and is removed by vacuum filtration. 

To absolution of 1.00 mol of ethyl lithium in 800-900 ml of diethyl ether (see Chapter II, Exp. 1) was added, with cooling between -20 and -10°C, 0.50 nol of dry propargyl alcohol, dissolved in 100 ml of diethyl ether. Subsequently 1.1 mol of trimethylchlorosilane was introduced over a period of 25 min with cooling between -15 and +5°C. After stirring for an additional 2 h at about 30°C the suspension was poured into a solution of 30 g of acetic acid in 150 ml of water. After stirring for 1 h at room temperature the layers were separated and the aqueous layer v/as extracted four times with diethyl ether. The combined ethereal solutions were washed with sodium hydrogen carbonate solution in order to neutralize acetic acid, and were then dried over magnesium sulfate. The diethyl ether was removed by evaporation in a water-pump vacuum and the residue distilled... 

But when the reaction is carried out in an aqueous solution of sodium hydrogen carbonate, extension of the ring occurs with formation of dihydro-l,4-thiazine derivative (Scheme 19). the structure of which has been established by mean of NMR and infrared spectra (41). 

The systematic name for bi carbonate ion is hydrogen carbonate Thus the system atic name for sodium bicar bonate (NaHCOs) is sodium hydrogen carbonate... 

A. l-THmethyleilyloxyayalopentsne. A 1-L, two-necked, round-bottomed flask is equipped with a mechanical stirrer and a reflux condenser having a drying tube (calcium chloride). The flask is charged with 200 mL of dimethylformamide (Note 1), 45 g (0.54 mol) of cyclopentanone (Note 2), 65.5 g (0.6 mol) of chlorotrimethylsilane (Note 2) and 185 mL (1.33 mol) of triethylamine (Note 1), and the mixture is refluxed for 17 hr (Note 3). The mixture is cooled, diluted with 350 mL of pentane, and washed four times with 200-mL portions of cold saturated aqueous sodium hydrogen carbonate. The... 

The checkers performed this step on a smaller scale (ca. f) and noted (proton magnetic resonance spectrum) occasional contamination (up to 10%) by phthalic anhydride. This impurity causes no subsequent difiSculties. Washing of the crude reaction mixture with cold aqueous sodium hydrogen carbonate resulted in serious product loss because of its appreciable solubility in this medium and therefore should be avoided. 

In one run the cheekers obtained only 135 g. of crude product by this procedure. The aqueous solution which was decanted from the crude product was divided into three portions and each portion was extracted with one 250-ml. portion of ether. The combined ether extracts were washed with water and 10% aqueous sodium hydrogen carbonate, dried over anhydrous magnesium sulfate, and concentrated on the rotary evaporator to afford an additional 83 g. of crude product, for a total of 218 g. 

Excess sodium sulfite or sodium hydrogen carbonate should be avoided, since either would rSa t-AYith/the aulfonyl cyanide once formed. 

Dipping solution Dissolve 0.1 g 2,6-dibromoquinone-4-chloroimide in 10 ml dimethyl sulfoxide saturated with sodium hydrogen carbonate. Then make up to 100 ml with chloroform. 

Sodium hydrogen carbonate Dimethyl sulfoxide (DMSO)... 

Acetylene is passed for 1 hr through a mixture consisting of 0.5 g (72 mg-atoms) of lithium in 100 ml of ethylene-diamine. A solution prepared from 1 g (3.5 mmoles) of rac-3-methoxy-18-methylestra-l,3,5(10)-trien-I7-one and 30 ml of tetrahydrofuran is then added at room temperature with stirring over a period of 30 min. After an additional 2 hr during which time acetylene is passed through the solution the mixture is neutralized with 5 g of ammonium chloride, diluted with 50 ml water, and extracted with ether. The ether extracts are washed successively with 10% sulfuric acid, saturated sodium hydrogen carbonate and water. The extract is dried over sodium sulfate and concentrated to yield a solid crystalline material, which on recrystallization from methanol affords 0.95 g (87%) of rac-3-methoxy-18-methyl-17a-ethynyl-estra-l,3,5(10)-trien-17jB-ol as colorless needles mp 161°. 

N-Cyclohex-l-enylpyrrolidine (9 g 0 06 mol) was dissolved in pentane with A -ethyldiisopropylamine (7.8 g 0.06 mol). Perfluorohexyl iodide (13.4 g, 0.03 mol) IS added to the solution. Aprecipitate of A-ethyldiisopropylamine hydroiodide IS formed instantly After 3 h, the precipitate is filtered off, and the solution is evaporated The crude liquid is hydrolyzed with 6 mL of 40% sulfuric acid The mixture is stirred for 3 h and extracted with ether. The ether layer is neutralized with aqueous sodium hydrogen carbonate, washed with water, and dried over magnesium sulfate. The solvent is evaporated, and the residue is distilled. A second distillation with a spinning-band column yields 7 9 g (63%) of pure 2-(perfluoro-hexyl)cyclohexanone (bp, 71 -73 °C at 0 4 mm of Hg). 

Natron, n. soda, in the following senses (1) sodium carbonate, Na2COa ( kohlensaurea Natron ) (2) sodium hydrogen carbonate, NaHCOa ( doppcltkohlensaures Natron ) (3) sodium hydroxide or caustic soda, NaOH, usually called Atznatron (4) in older names, sodium oxide, NajO (as in schwefel-saures Natron, sodium sulfate), -aiaun,... 

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