24/06/2005 - Controller General of Patents, Designs, and Trade Marks

(21) Application No. 1676/DEL/1998 A (22) Date of filing of Application: 18/06/1998
(54) Title of the invention: “A Process For Purification of Sodium Chloride Containing Sodium
Sulphate Impurity.”
(51) International Classification 7 :
(30) Priority Data :
(31) Document No.:NIL
(32) Date : NIL
(33) Name of convention country : NIL
(66) Filed U/s 5(2) : NIL
(61) Patent of addition to application No. :
NA
(62) Filed on : NA
(63) Divisional to Application No. :NIL
(64) Filed on : NA
Total No of Pages: 11
(71) Name of the applicant:
COUNCIL OF SCIENTIFIC INDUSTRIAL
RESEARCH
Address of the Applicant:
Rafi Marg New Delhi–110001
(72) Name of the Inventor:
KANAIYALAL DAMODARDAS PADIA
SATISH HARIRAY MEHTA
ROHIT HARIKRISHNA TRIVEDI
KAUSHIK JETHALAL LANGALIA
MAHESH RAMNIKLAL GANDHI
PROF. PARAMASIVAM NATARAJAN
(57) Abstract:
A process for purification of sodium chloride containing sodium impurity which has
definite composition. The invention consists of a composition of Didwana salts found in the
Didwana region of Rajasthan State containing less percentage of impurities which are within the
permissible limit for industrial grade salt. The principle of the process is based on the phase
equilibrium of NaCl–Na2So4–H2O. The salt obtained is the upgraded salt. It provides Glauber`s
salt and is a cyclic process with cost effectiveness. The resultant salt is named as salt efficient
brine (SDB). Moreover induced crystallization in the invention makes the process energy efficient
which with high industrial applicability.
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