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PL124732B1 - Method of preparation of the solution for electrolytic manufacture of chlorine and sodium hydroxide using diaphragm method - Google Patents

Method of preparation of the solution for electrolytic manufacture of chlorine and sodium hydroxide using diaphragm method Download PDF

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Publication number
PL124732B1
PL124732B1 PL20772578A PL20772578A PL124732B1 PL 124732 B1 PL124732 B1 PL 124732B1 PL 20772578 A PL20772578 A PL 20772578A PL 20772578 A PL20772578 A PL 20772578A PL 124732 B1 PL124732 B1 PL 124732B1
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PL
Poland
Prior art keywords
chlorine
sodium hydroxide
concentration
waste water
solution
Prior art date
Application number
PL20772578A
Other languages
Polish (pl)
Other versions
PL207725A1 (en
Inventor
Adam Korczynski
Witold Gnot
Zygmunt Walburg
Ignacy Motyka
Franciszek Gorka
Wiktor Adamus
Zdzislaw Burek
Andrzej Telka
Julian Foksa
Janusz Smardzewski
Roman Jodlowski
Edward Budkiewicz
Marian Tomasik
Original Assignee
Politechnika Slaska Im Wincent
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Application filed by Politechnika Slaska Im Wincent filed Critical Politechnika Slaska Im Wincent
Priority to PL20772578A priority Critical patent/PL124732B1/en
Publication of PL207725A1 publication Critical patent/PL207725A1/xx
Publication of PL124732B1 publication Critical patent/PL124732B1/en

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Description

Przedmiotem wynalazku jest sposób przygotowa¬ nia roztworu do elektrolitycznego wytwarzania chlo¬ ru i wodorotlenku sodowego (metoda przeponowa.Do elektrolitycznego wytwarzania chloru i wo¬ dorotlenku -sodowego stosuje sie nienasycone so¬ lanki z kopalin wegla kamiennego stanowiace wod¬ ny roztwór chlorku sodowego zanieczyszczonego znacznymi ilosciami jonów wapniowych, magnezo¬ wych, siarczanowych oraz innymi zwiazkami.W znanym procesie elektrolitycznego wytwarza¬ nia chloru i wodorotlenku sodowego metoda prze¬ ponowa jako surowiec stosuje sie wodny roztwór chlorku sodowego o stezeniu okolo 310 g/dm8 oczy¬ szczony od nadmiernych ilosci zanieczyszczen w po¬ staci jonów wapniowych, magnezowych i siarcza¬ nowych.Celem wynalazku jest przygotowanie solanek roz¬ cienczonych pochodzenia naturalnego do procesu elektrolizy przeponowej. Zostal on osiagniety przez doprowadzenie stezenia solanki do wartosci co naj¬ mniej 130 g/dm3 oraz oczyszczenie jej od jonów Mg2+, Ca2+, a nastepnie dosycenie sola wypadowa do stezenia wymaganego warunkami elektrolizy.Sposób przygotowania roztworu do elektrolitycz¬ nego wytwarzania chloru i wodorotlenku sodowego wedlug wynalazku polega na tym, ze odpadowe wody z kopaln wegla kamiennego o stezeniu chlor¬ ku sodowego co najmniej 130 g/dm8 ewentualnie solanki bardziej rozcienczone zatezone termicznie do tego stezenia, oczyszcza sie od zanieczyszczen 10 15 20 29 chemicznych a nastepnie dosyca sola wypadowa uzyskiwana z termicznego zatezenia katolitu, sta¬ nowiacego produkt elektrolizy.W rozwiazaniu alternatywnym odpadowe wody z kopaln wegla kamiennego wstepnie dosyca sie sola stala lub solanke nasycona do stezenia chlor¬ ku sodowego eonajmniej 130 g/dm8, oczyszcza sie od zanieczyszczen chemicznych a nastepnie dosyca sola wypadowa uzyskiwana z termicznego zateza- nia katolitu. Przedtem odpadowe wody z kopaln wegla kamiennego oczyszcza sie wstepnie od zanie¬ czyszczen mechanicznych.Sposób wedlug wynalazku pozwala na zastoso¬ wanie solanek rozcienczonych, z pelnym wykorzy¬ staniem zawartego w nich chlorku sodowego, jako surowca do produkcji chloru oraz dzieki prowa¬ dzeniu procesu oczyszczania przy obnizonym ste¬ zeniu chlorku sodowego powoduje zmniejszenie strat soli w procesie oczyszczania solanki oraz przy¬ spieszenia procesu sedymentacji osadów wytraco¬ nych zanieczyszczen w postaci CaCC3 i Mg(OH)2.Sposób przygotowania solanek kopalnianych do wytwarzania chloru i wodorotlenku sodowego me¬ toda przeponowa objasniaja blizej przyklady oraz ilustruje schemat przedstawiony na rysunku.Przyklad I. Solanke kopalniana o stezeniu chlorku sodowego okolo 100 g/dm8 wstepnie oczy¬ szczona od zanieczyszczen mechanicznych, poddaje sie termicznemu zatezaniu do stezenia NaCl okolo 130 g/dm8. Solanke o takim stezeniu oczyszcza sie 124 7323 124 732 4 od zanieczyszczen chemicznych w postaci jonów Ca2+, Mg*+, SO42-, a nastepnie dosyca do stezenia NaCl okolo 310 g/dm8 sola wypadowa, bedaca pro¬ duktem zatezania katolitu. Proces elektrolizy pro¬ wadzi sie w elektrolizerach przeponowych. Produk¬ tami elektrolizy sa: chlor, wodór oraz lug poelek- trolityczny bedacy mieszanina wodorotlenku sodo¬ wego o stezeniu okolo 130 g/dm* orasz chlorku so¬ dowego o stezeniu okolo 180 g/dm8. Lug poelektro- lityczny zateza sie do stezenia wodorotlenku sodo¬ wego okolo 45Vo. W trakcie zatezania lugu wytra¬ ca sie chlorek sodowy zwany sola wypadowa, któ¬ ry po odfiltrowaniu kieruje sie do dosycania so- r- lanki crstezenlu 130 g/dm8 do wartosci okolo * 310 g/dni8. j Przyklad ki. Solanke kopalniana o stezeniu ; ttóorku sodowego okolo 100 g/dm8 oczyszczona od I ^^M^z^^^e^inechaimK^nych, poddaje sie wstep- *~ nemu dosyceniu sola stala doprowadzona z ze¬ wnatrz do stezenia NaCl 130 g/dm8. Dalej postepu¬ je sie tak jak w przykladzie I.Przyklad III. Solanke kopalniana o stezeniu chlorku sodowego okolo 100 g/dm8 oczyszczona od zanieczyszczen mechanicznych, poddaje sie wstep¬ nemu dosycaniu solanka nasycona doprowadzana z zewnatrz do stezenia NaCl 130 g/dm8. Dalej po¬ stepuje sie tak jak w przykladzie I.Zastrzezenia patentowe 1. Sposób przygotowania roztworu do elektroli¬ tycznego wytwarzania chloru i wodorotlenku so- 5 dowego metoda przeponowa, znamienny tym, ze od¬ padowe wody z kopaln wegla kamiennego o ste¬ zeniu chlorku sodowego co najmniej 130 g/dm8, e- wentualnie wody odpadowe wstepnie zatezone ter¬ micznie do stezenia chlorku sodowego co najmniej 10 130 g/dm8 oczyszcza sie od zanieczyszczen chemi¬ cznych, a nastepnie dosyca sola wypadowa uzyski¬ wana z termicznego zatezania katolitu. 2. Sposób wedlug zastrz. 1, znamienny tym, ze odpadowe wody z kopaln wegla kamiennego oczy- 15 szcza sie wstepnie od zanieczyszczen] mechanicz¬ nych. 3. Sposób przygotowania roztworu do elektroli¬ tycznego wytwarzania chloru i wodorotlenku sodo¬ wego metoda przeponowa, znamienny tym, ze od¬ padowe wody z kopaln wegla kamiennego wstep¬ nie dosyca sie sola stala lub solanka nasycona do stezenia chlorku sodowego co najmniej 130 g/dm8, oczyszcza sie od zanieczyszczen chemicznych, a na¬ stepnie dosyca sola wypadowa uzyskiwana z ter- 23 miesnego zatezania katolitu. 4. Sposób wedlug zastrz. 2, znamienny tym, ze odpadowe wody z kopaln wegla kamiennego oczy¬ szcza sie wstepnie od zanieczyszczen mechanicz¬ nych. 20 \124 732 SOLANKA KOPALNIANA OCZYSZCZANIE WSTCPNE ZTLZ ENERO i A J " 1 ZATEZANIE TERMICZNE DOSYCANIE WSTEPNE 1 <- SOL STALA SOLANKA NASYCONA I j CHLOR 1 OCZYSZCZANIE CHEMICZNE ^r DOSYCANIE SOLANKI ^ r ELEKTROLIZA "^r ZATEZANIE LUGU POELEKTROL ITYCZNEGO A 1 WODÓR SÓL WYPADOWA T WODOROTLENEK SODOWY PL PLThe subject of the invention is a method of preparing a solution for the electrowinning of chlorine and sodium hydroxide (diaphragm method. For the electrolytic production of chlorine and sodium hydroxide, unsaturated brines from coal minerals are used, which are an aqueous solution of sodium chloride contaminated with significant In the known process of electrolytic production of chlorine and sodium hydroxide, the transfer method uses an aqueous solution of sodium chloride with a concentration of about 310 g / dm8, cleaned of excessive amounts of impurities. in the form of calcium, magnesium and sulphate ions. The aim of the invention is to prepare natural-origin diluted brines for the diaphragm electrolysis process. Mg2 +, Ca2 +, and then saturation of SO The method of preparing the solution for the electrolytic production of chlorine and sodium hydroxide according to the invention consists in the fact that waste water from coal mines with a sodium chloride concentration of at least 130 g / dm8, or brines more diluted with concentrated thermally to this concentration, it is cleaned of chemical impurities and then the salt obtained from the thermal concentration of the catholyte, which is a product of electrolysis, is supplemented with of sodium chloride, at least 130 g / dm8, is purified from chemical impurities and then supplemented with the resultant salt obtained from the thermal concentration of the catholyte. Before that, waste water from coal mines is preliminarily cleaned of mechanical impurities. at a reduced concentration of sodium chloride, it reduces salt losses in the brine purification process and accelerates the sedimentation process of precipitated pollutants in the form of CaCC3 and Mg (OH) 2. The examples are explained more closely and the diagram shown in the drawing is illustrated. Example I. Mine brine with sodium chloride concentration of about 100 g / dm8, pre-cleaned of mechanical impurities, is subjected to thermal concentration to NaCl concentration of about 130 g / dm8. The brine of this concentration is purified from chemical impurities in the form of Ca2 +, Mg * +, SO42- ions, and then it is supplemented to NaCl concentration of about 310 g / dm8 as a resultant salt, which is a product of catholyte concentration. The electrolysis process is carried out in diaphragm cells. The products of electrolysis are: chlorine, hydrogen and electrolytic liquor, which are a mixture of sodium hydroxide with a concentration of about 130 g / dm3 or sodium chloride with a concentration of about 180 g / dm8. The electrolytic lug is concentrated to a sodium hydroxide concentration of about 45%. During the concentration of the slurry, the sodium chloride, known as the waste salt, is lost, which, after filtering, is directed to the saturation of the brine with 130 g / dm8 of crstezenl to a value of about 310 g / day8. j Example. Mine brine at concentration; about 100 g / dm8 of sodium hydroxide, purified from 1 ^^ M ^ of inechaimides, is subjected to initial saturation with a solid salt brought from the inside to a NaCl concentration of 130 g / dm8. Then the procedure is as in example I. Example III. The mine brine with a sodium chloride concentration of about 100 g / dm8, cleaned of mechanical impurities, is subjected to initial saturation with saturated brine supplied externally to a NaCl concentration of 130 g / dm8. The procedure for the preparation of a solution for the electrolytic production of chlorine and sodium hydroxide by the diaphragm method, characterized in that the waste water from coal mines with a chloride concentration is of sodium chloride at least 130 g / dm8, or alternatively, the waste waters initially thermally concentrated to a sodium chloride concentration of at least 10,130 g / dm8 are cleaned of chemical impurities, and then supplemented with the salt obtained from the thermal catholyte concentration. 2. The method according to p. A method as claimed in claim 1, characterized in that the waste water from coal mines is initially cleaned of mechanical impurities. 3. The method of preparing the solution for the electrolytic production of chlorine and sodium hydroxide by the diaphragm method, characterized in that the waste water from coal mine is initially saturated with solid salt or saturated brine to the sodium chloride concentration of at least 130 g / dm8, is purified of chemical impurities, and then saturated with the salt obtained from the thermal concentration of the catholyte. 4. The method according to p. A method according to claim 2, characterized in that the waste water from coal mines is pre-cleaned of mechanical impurities. 20 \ 124 732 MINE BRINE PRE-TREATMENT OF ZTLZ ENERO and AJ "1 THERMAL TREATMENT PREPARATION 1 <- SOL STEEL SATURATED SALT I j CHLORINE 1 CHEMICAL TREATMENT ^ r BRINE TREATMENT ^ r ^ ELECTROLETIC CONTROL T SODIUM HYDROXIDE PL PL

Claims (4)

1. Zastrzezenia patentowe 1. Sposób przygotowania roztworu do elektroli¬ tycznego wytwarzania chloru i wodorotlenku so- 5 dowego metoda przeponowa, znamienny tym, ze od¬ padowe wody z kopaln wegla kamiennego o ste¬ zeniu chlorku sodowego co najmniej 130 g/dm8, e- wentualnie wody odpadowe wstepnie zatezone ter¬ micznie do stezenia chlorku sodowego co najmniej 10 130 g/dm8 oczyszcza sie od zanieczyszczen chemi¬ cznych, a nastepnie dosyca sola wypadowa uzyski¬ wana z termicznego zatezania katolitu.1. Claims 1. Method for the preparation of a solution for the electrolytic production of chlorine and sodium hydroxide by the diaphragm method, characterized in that waste water from hard coal mines with a sodium chloride concentration of at least 130 g / dm8, - ventually, the waste water, which has been thermally concentrated to a sodium chloride concentration of at least 10 130 g / dm 3, is cleaned of chemical impurities, and then supplemented with the waste salt obtained from the thermal fusion of the catholyte. 2. Sposób wedlug zastrz. 1, znamienny tym, ze odpadowe wody z kopaln wegla kamiennego oczy- 15 szcza sie wstepnie od zanieczyszczen] mechanicz¬ nych.2. The method according to p. A method as claimed in claim 1, characterized in that the waste water from coal mines is initially cleaned of mechanical impurities. 3. Sposób przygotowania roztworu do elektroli¬ tycznego wytwarzania chloru i wodorotlenku sodo¬ wego metoda przeponowa, znamienny tym, ze od¬ padowe wody z kopaln wegla kamiennego wstep¬ nie dosyca sie sola stala lub solanka nasycona do stezenia chlorku sodowego co najmniej 130 g/dm8, oczyszcza sie od zanieczyszczen chemicznych, a na¬ stepnie dosyca sola wypadowa uzyskiwana z ter- 23 miesnego zatezania katolitu.3. The method of preparing the solution for the electrolytic production of chlorine and sodium hydroxide by the diaphragm method, characterized in that the waste water from coal mine is initially saturated with solid salt or saturated brine to the sodium chloride concentration of at least 130 g / dm8, is purified of chemical impurities, and then saturated with the salt obtained from the thermal concentration of the catholyte. 4. Sposób wedlug zastrz. 2, znamienny tym, ze odpadowe wody z kopaln wegla kamiennego oczy¬ szcza sie wstepnie od zanieczyszczen mechanicz¬ nych. 20 \124 732 SOLANKA KOPALNIANA OCZYSZCZANIE WSTCPNE ZTLZ ENERO i A J " 1 ZATEZANIE TERMICZNE DOSYCANIE WSTEPNE 1 <- SOL STALA SOLANKA NASYCONA I j CHLOR 1 OCZYSZCZANIE CHEMICZNE ^r DOSYCANIE SOLANKI ^ r ELEKTROLIZA "^r ZATEZANIE LUGU POELEKTROL ITYCZNEGO A 1 WODÓR SÓL WYPADOWA T WODOROTLENEK SODOWY PL PL4. The method according to p. A method according to claim 2, characterized in that the waste water from coal mines is pre-cleaned of mechanical impurities. 20 \ 124 732 MINE BRINE PRE-TREATMENT OF ZTLZ ENERO and AJ "1 THERMAL TREATMENT PREPARATION 1 <- SOL STEEL SATURATED SALT I j CHLORINE 1 CHEMICAL TREATMENT ^ r BRINE TREATMENT ^ r ^ ELECTROLETIC CONTROL T SODIUM HYDROXIDE PL PL
PL20772578A 1978-06-17 1978-06-17 Method of preparation of the solution for electrolytic manufacture of chlorine and sodium hydroxide using diaphragm method PL124732B1 (en)

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PL20772578A PL124732B1 (en) 1978-06-17 1978-06-17 Method of preparation of the solution for electrolytic manufacture of chlorine and sodium hydroxide using diaphragm method

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PL124732B1 true PL124732B1 (en) 1983-02-28

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