Council of Scientific and Industrial Research

Koushik Halder

Pushpito Kumar Ghosh

Vadakke Puthoor Mohandas

Himanshu Labhshanker Joshi

Sohan Lal Daga

Rajinder Nath Vohra

Maheshkumar Ramniklal Gandhi

Hasina Hajibhai Deraiya

Rohit Harshadray Dave

Kishorkumar Manmohandas Majeethia

Rahul Jasvantrai Sanghavi

Kaushik Jethalal Langalia

Abdulhamid Usmanbhai Hamidani

Ramjibhai Devjibhai Rathod

Rohit Harshadrai Dave

Upendra Padmakant Saraiya

Hasina Hajibhai Deriya

Ran Bahadur Yadav

Ashokkumar Bhagvanjibhai Kasundra

Purashottambhai Ravajibhai Jadav

Sohanlal Daga

Abdulhamid Usmanbhai Hamdani

Himanshu Labshanker Joshi

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 MgClusing end bittern generated in the process of making carnallite. Decomposed carnallite liquor produced is reacted with hydrated lime for preparing CaClsolution 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.

Process for recovery of sulphate of potash

The present invention relates to recovery of industrial grade potassium chloride and low sodium edible salt from bittern as part of an integrated process. The process comprises, mixing low sulphate concentrated feed bittern (a by-product of salt industry) of density 31.5 to 32.5&#xb0; Be (sp.gr. 1.277&#x2013;1.289) with high density end bittern of density 36.5 to 37.5&#xb0; Be' (sp.gr. 1.336&#x2013;1.35), thereby producing low sodium carnallite, from which industrial grade potassium chloride is produced. The resultant bittern is evaporated in forced evaporation system, thereby producing crude carnallite, from which low sodium salt that would be beneficial to persons suffering from hypertension is produced. When sulphate-rich bittern is used, such bittern is desulphated with CaClthat is generated from carnallite decomposed liquor through reaction with lime, and wherein low BO-containing Mg(OH)is a by-product. The entire content of potassium in feed bittern is recovered in the process of the invention.

Simultaneous recovery of potassium chloride and KCL enriched edible salt

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.

Process for recovery of low sodium salt from bittern

A new process for recovery of common salt, potassium chloride, concentrated magnesium chloride with enriched bromide, and high purity magnesia from brine in an integrated manner, said process comprises preparation of calcium chloride by reaction of hydrochloric acid generated in the process with limestone, desulfatation of brine with calcium chloride, production of sodium chloride of superior quality in solar pans, solar evaporation of bittern thereby producing carnallite and end bittern, processing carnallite through established processes to produce potassium chloride, recovering end bittern containing highly concentrated magnesium chloride and enriched bromide and calcination of a part of the end bittern after solidification to produce high purity magnesia and hydrochloric acid utilizable in the process.

Recovery of common salt and marine chemicals from brine

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.

Preparation of non-hazardous brominating reagents

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Bhavnagar, India

Koushik Halder