JPS54131594A - Purification of caustic soda - Google Patents

Purification of caustic soda

Info

Publication number
JPS54131594A
JPS54131594A JP3914278A JP3914278A JPS54131594A JP S54131594 A JPS54131594 A JP S54131594A JP 3914278 A JP3914278 A JP 3914278A JP 3914278 A JP3914278 A JP 3914278A JP S54131594 A JPS54131594 A JP S54131594A
Authority
JP
Japan
Prior art keywords
naoh
crystals
slurry
concentrator
sent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3914278A
Other languages
Japanese (ja)
Inventor
Yoshitaka Yamaoka
Noriaki Okamoto
Tadahiro Kiyotoshi
Masaichi Miyashita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IHI Corp
Tokuyama Corp
Original Assignee
IHI Corp
Tokuyama Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IHI Corp, Tokuyama Corp filed Critical IHI Corp
Priority to JP3914278A priority Critical patent/JPS54131594A/en
Publication of JPS54131594A publication Critical patent/JPS54131594A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To obtain high purity NaOH aqueous solution by purifying effectively a NaOH aqueous solution containing sodium chloride in particular by the procedure in which a slurry containing NaOH crystals obtained by cooling a NaOH aqueous solution is concentrated and then NaOH crystals are separated.
CONSTITUTION: The aqueous 32 to 55 wt % NaOH solution 8 in general, is sent to the crystallization process 9 to crystallize NaOH crystals by cooling, and then the slurry 10 containing the crystals is sent to the concentration process 11 where fine NaOH crystals and dilute slurry containing fine sodium chloride crystals are removed for concentration. And, the concentrated slurry 12 obtained from the concentrator 11-1 of the process 11 is sent to the separation process 13 where NaOH crystals are obtained by filtration and the filtrate 16 is drained. On the other hand, the concentrated slurry obtained from the concentrator 11-2 is recycled to the process 9, and also the dilute slurry 15 is taken out of each concentrator.
COPYRIGHT: (C)1979,JPO&Japio
JP3914278A 1978-04-05 1978-04-05 Purification of caustic soda Pending JPS54131594A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3914278A JPS54131594A (en) 1978-04-05 1978-04-05 Purification of caustic soda

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3914278A JPS54131594A (en) 1978-04-05 1978-04-05 Purification of caustic soda

Publications (1)

Publication Number Publication Date
JPS54131594A true JPS54131594A (en) 1979-10-12

Family

ID=12544848

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3914278A Pending JPS54131594A (en) 1978-04-05 1978-04-05 Purification of caustic soda

Country Status (1)

Country Link
JP (1) JPS54131594A (en)

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