Technologies




Technologies listed under Salt and Marine Chemicals

Cost-effective process for production of ultrapure solar salt on large scale


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Cost-effective process for recovery of low sodium salt from bittern


A new process for recovery of Low Sodium Salt from bittern has been described in the present invention, the said process comprising desulphatation of bittern (by-product of salt industry), evaporation of bittern in solar pans and processing of solid mixture with water to produce a mixture of sodium and potassium chlorides and optionally preparing "free flowing" and iodized, by known techniques.

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Device for remote monitoring of brine density in salt works


The present invention relates to a novel device that enables a person to gauge the brine density in solar salt works from afar without recourse to sampling of the brine. The device--which can be considered as an improvisation over the conventional laboratory type Baume meter can be placed directly in the salt pan. The device remains sunk, and therefore invisible, until the desired density of brine is approached. Thereafter it gradually floats up and becomes visible from afar. From appropriate markings on the rod connected to the top end of the device, it can be gauged whether the brine is yet to attain the desired density, or has attained the desired density range, or has exceeded the desired density range. The device is resistant to corrosion and able to combat extreme weather conditions prevailing in solar salt works. The control of brine density from afar helps eliminate the need for frequent sampling of brine for density measurement that would make adherence to the optimum process of salt production easier. The methodology can be extended to production of other marine chemicals such as carnallite and kainite.

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(a) Preparation of highly stable iodizing agent;
(b) cost-effective iodizing agents and their preparation


The present invention is directed to provide a novel iodized salt that is iodized by- the mixture of iodide and iodate in 5:1 molar ratio is used for iodization of salt and is shown to be a source of latent elemental iodine that can be liberated from the salt under acidic conditions such as that which prevails in the stomach. The iodizing agent is stabilized in the salt by adjusting pH to be in the range of 7.5-8.0. The said iodizing agent may be prepared cost-effectively through the reaction of pure iodine crystals with a suitable alkali.

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Integrated process for the recovery of sulphate of potash and refractory grade magnesia from sea bittern


The present invention is directed to a novel integrated process for the recovery of sulphate of potash (SOP) from sulphate rich bittern. The process requires bittern and lime as raw materials. Kainite type mixed salt is obtained by fractional crystallization of the bittern, and is converted to schoenite which is subsequently reacted with muriate of potash (MOP) for its conversion to SOP. End liquor from kainite to schoenite conversion (SEL) is desulphated and supplemented with MgCl2using end bittern generated in the process of making carnallite. Decomposed carnallite liquor produced is reacted with hydrated lime for preparing CaCl2 solution and high purity Mg(OH)2 having low boron content. It is shown that the liquid streams containing potash are recycled in the process, and the recovery of potash in the form of SOP is quantitative.

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Process for the preparation of refractory grade magnesia of >97% purity and requiring less water in the process


The present invention provides an improved process for the preparation of MgO of high purity >99% from salt bitterns via intermediate formation of Mg(OH)2 obtained from the reaction of MgCl2 and lime, albeit indirectly, i.e., MgCl2 is first reacted with NH3 in aqueous medium and the slurry is then filtered with ease. The resultant NH4Cl-containing filtrate is then treated with any lime, to regenerate NH3 while the lime itself gets transformed into CaCl2 that is used for desulphatation of bittern so as to recover carnallite and thereafter MgCl2of desired quality required in the present invention. The crude Mg(OH)2is dried and calcined directly to produce pure MgO, taking advantage of the fact that adhering impurities in the Mg(OH)2 either volatilize away or get transformed into the desired product, i.e., MgO.

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Pharma and halogen grade synthetic hydrotalcites (SHT) from bitterns


An improved process is described for the preparation of surface modified hydrotalcite. The process comprises reacting a precursor of magnesium and aluminium in the presence of suitable alkali carbonate at high temperature. The product has a BET surface area of 20M2/gm and average particle size of 5 micorns and is useful as halogen scavenger and fire retardant.

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(a) Cost effective preparation of safe brominating reagent having high atom efficiency
(b) Processes for preparation of several commercially important bromo derivatives and pharmaceutical intermediates utilizing the reagent


The present invention relates to a non-hazardous brominating reagent from an aqueous alkaline bromine byproduct solution obtained from bromine recovery plant and containing 25 to 35% bromine dissolved in aqueous lime or sodium hydroxide containing alkali bromide and alkali bromate mixture having bromide to bromate stoichiometric ratio in the range of 5:1 to 5.1:1 or 2:1 to 2.1:1 and a pH ranging between 8-12 and also relates to a method for borminating aromatic compounds by using the above brominating agent.

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