Abstract: Anhydrous sodium carbonate is crystallized from saturated aqueous sodium carbonate solutions at temperatures in the range of 104.degree. to below 109.degree. C. by adding to the solution very small proportions of additives which function to reduce the transition temperature of monohydrate to anhydrous sodium carbonate.

Abstract: Method for clarifying a carbonate process solution containing suspended insolubles which solution is used in the preparation of crystals selected from the group consisting of sodium bicarbonate, sodium sesquicarbonate, anhydrous sodium carbonate, and sodium carbonate monohydrate, which comprises dispersing in the carbonate process solution prior to crystallization a cationic flocculating agent comprising a substituted guar gum containing one quaternary ammonium group per 2 to 12 monosaccharide units to agglomerate the suspended insolubles so the suspended insolubles will readily settle out of the carbonate process solution.This invention relates to a process for clarifying a carbonate process solution used in the preparation of sodium bicarbonate, sodium sesquicarbonate, anhydrous sodium carbonate or sodium carbonate monohydrate crystals.

Abstract: This invention involves a process for producing high bulk density sodium carbonate from crude trona wherein sodium carbonate monohydrate purge streams containing high amounts of organic impurities are passed to an anhydrous crystallizer operated at temperatures above about 109.degree.C wherein anhydrous sodium carbonate crystals are formed having high bulk densities of about 60 to about 80 lbs/ft.sup.3.