Magnesium carbonate trihydrate

The carbonate also can be made from potassium chloride, magnesium carbonate trihydrate and carbon dioxide under 30 atm at ordinary temperatures by Engel-Precht process ... 

The exothermic effects associated with some dehydrations [18] may result from delayed reciystallization, or the oxidation of a product of dehydration. Dehydration of magnesium carbonate trihydrate, followed by heating in carbon dioxide, resulted in the exothermic transformation of an anhydrous pseudomorph of the reactant into magnesite, MgCOj. 

Iron(II) fluoride Iron(II) hydroxide Iron(III) hydroxide Iron(III) phosphate dihydrate Lanthanum iodate Lead(II) bromide Lead(II) carbonate Lead(II) chloride Lead(II) fluoride Lead(II) hydroxide Lead(II) iodate Lead(II) iodide Lead(II) selenate Lead(II) sulfate Lithium carbonate Lithium fluoride Lithium phosphate Magnesium carbonate Magnesium carbonate trihydrate... 

Magnesium carbonate trihydrate MgC03-3H30 14467-83-1 138.360 col monoci cry 166 1.8 0.18 ... 

The trihydrate, MgC03 3H20 or other hydrates on heating form basic magnesium carbonates, the product compositions depending on degree of water of crystallization and temperature. 

The first step in any kinetic study is to identify all the products and intermediates of the reaction. Dehydration often involves several distinct steps which may be very dependent upon reaction conditions, e,g, copper sulfate pentahydrate may yield trihydrate and/or monohydrate [29,30], Metastable intermediates may be formed, e,g, amorphous magnesium carbonate produced on dehydration undergoes [18] exothermic recrystallization at higher temperatures,... 

Highly chlorinated paraffins can be used as secondary plasticizers to reduce flammability and smoke (48). Nonplasticizer additives to assist in flame-retarding plasticized PVC include antimony oxide, alumina trihydrate, zinc borate, and magnesium carbonate (49). 

Magnesium carbonate dihydroxide trihydrate MgC03-Mg(0H)3-3H30 12143-96-3 196.680 wh monoci cry dec 2.04 ... 

Aluminum trihydrate, magnesium carbonate, and magnesium hydroxide are three functional fillers that on thermal decomposition will emit water of hydration, and in the case of magnesium carbonate the emitant is carbon dioxide. The use of these fillers in commercial applications confirms their performance and effectiveness as smoke supperessants. 

There are several fillers that impart flame-retardant properties to mbber compounds. These are magnesium hydroxide, Versamag or Zerogen 50 magnesium carbonate, Elastocarb or Magcarb L zinc borate, Firebrake ZB alumina trihydrate, Micral and antimony oxide, Fireshield H, L, UF or Synpro-Ware R321. These are used primarily with NBR/PVC blends with chlorinated paraffins and/or phosphate ester plasticizers and mineral fillers for flame-resistant applications. 

For flame-resistant vulcanizates the use of 100-200 pphr aluminum trihydrate with a vinyl silane is recommended along with zinc borate at the 10-20 pphr level and 0-20 pphr of magnesium carbonate. Details of compounding principles will be discussed later. 

In a one-liter separatory funnel, 94 g (0.215 mol) of scopolamine hydrobromide trihydrate was dissolved in 250 ml of water, made alkaline by shaking with 40 g (1 mol) of sodium hydroxide in 150 ml of water, and the free base immediately extracted with ether. As scopolamine is somewhat soluble in water, the aqueous layer was saturated with potassium carbonate and again extracted with ether. The combined ether extracts were dried over anhydrous magnesium sulfate and the ether removed by distillation, leaving 65 g (0.214 mol 100% yield) of nearly colorless oil. Then 100 g (1.05 mols) of cold methyl bromide was added to a chilled, 500-ml pressure flask containing the 65 g of scopolamine, the flask stoppered tightly with a clamp, and allowed to stand at room temperature for 96 hours. 

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