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AssigneeBechtel International Corporation
InventorsJoseph M. Fox, III, Bruce D. Degen, Irving Leibson
Estimating the term…
Carnallite, comprising principally of MgCl.sub.2. KCl.6H.sub.2 O, with varying amounts of sodium chloride and other impurities, is dissolved in a lower saturated monohydric aliphatic alcohol having from one to four carbon atoms such as methanol, ethanol, propanol, isopropyl alcohol, N-butyl alcohol, secondary-butyl alcohol, iso-butyl alcohol, and tert-butyl alcohol, to dissolve the magnesium chloride therein leaving an insoluble residue of principally potassium chloride, sodium chloride and other materials. The residue is filtered from the solution, dried and stored or further processed. The filtrate, a magnesium chloride hydrate solution is further processed by injecting steam or water into the solution and removing, e.g., evaporating the methanol from the solution leaving an aqueous magnesium chloride hexahydrate brine. The recovered methanol is dried by distillation, condensed and recycled. The brine is stored for subsequent processing or dehydrated to a magnesium chloride dihydrate and granulated for storage and subsequent use.
A process for the recovery of the principal constituents of carnallite comprising the steps of contacting the cornallite with a lower saturated monohydric aliphatic alcohol having from one to four carbon atoms to form an alcohol-magnesium chloride hydrate solution and insoluble residue including potassium chloride;
A process for recovering magnesium chloride hydrate from carnallite comprising the steps of dissolving the magnesium chloride hydrate in a lower saturated monohydric aliphatic alcohol having from one to four carbon atoms by contacting the carnallite with the alcohol, injecting water into the solution, and evaporating the alcohol from the solution, the step of injecting the water being performed before a major portion of the alcohol has been evaporated.
A process for the recovery of magnesium chloride hydrate from carnallite comprising the steps of dissolving the magnesium chloride hydrate in a lower saturated monohydric aliphatic alcohol having from one to four carbon atoms by contacting the carnallite with the alcohol, removing from the solution the alcohol and substituting therefor water to form an aqueous magnesium chloride hydrate brine, and evaporating water from the aqueous brine in a heated gas and thereafter discharging the gas including moisture withdrawn from the brine to the atmosphere.
A process for the recovery of magnesium chloride hydrate from carnallite comprising the steps of contacting the carnallite with a lower saturated monohydric aliphatic alcohol having from one to four carbon atoms to thereby dissolve the magnesium chloride hydrate in the alcohol, and removing from the solution substantially all of the alcohol and substituting therefor a sufficient amount of water to form an aqueous magnesium chloride hydrate brine.
A process for the recovering of magnesium chloride hydrate from carnallite comprising the steps of dissolving the magnesium chloride hydrate in a lower saturated monohydric aliphatic alcohol having from one to four carbon atoms by contacting the carnallite with the alcohol, removing from the solution substantially all of the alcohol and substituting therefor water to form an aqueous magnesium chloride hydrate a slurry by heating the solution and withdrawing the alcohol as it evaporates, and adding a sufficient amount of water to form a brine having a relatively low viscosity, providing a heated gas, contacting the brine with the heated gas to thereby remove water from the brine and form an essentially dry magnesium chloride hydrate, and discharging the gas including water carried therein directly into the atmosphere.
Dependencies are inferred from the claim text.