PL381B1

PL381B1 - Method for the electrowinning of alkaline perborates.

Info

Publication number: PL381B1
Application number: PL381A
Authority: PL
Filing date: 1920-06-23
Publication date: 1924-07-30

Description

Przy wytwarzaniu alkalicznego nad¬ boranu przez elektrolize mieszanin roz¬ tworów alkalicznego weglanu i alka¬ licznego boranu znaleziono, ze nad¬ miar alkalicznego weglanu dziala po¬ myslnie na przebieg reakcji. Na tej za¬ sadzie nalezy dbac przy wytwarzaniu np. nadboranu sodowego o to, azeby stale istnial nasycony roztwór sody. Naj¬ lepiej pracuje sie wtedy, gdy soda ist¬ nieje trwale jako cialo osadowe, albo¬ wiem przez to zapewnione zostaje stale zupelne nasycanie roztworu soda. Do osiagniecia zadanego celu uzupelnia sie sode ustawicznie, lub w krótkich odste¬ pach czasu, tak dalece, jak tego wymaga tworzenie sie nadboranu. Mozna takze postepowac tak, ze juz zgóry dodaje sie tyle sody, ile jej potrzeba do przemiany na nadboran.Pod koniec elektrolizy nalezy dbac o to, zeby wcale nie bylo nierozpuszczo- nej sody lub tylko niewiele, a to by nie rozcienczac koncowego produktu.Wplyw, jaki wywiera stezenie sody na sprawnosc elektrolityczna, widoczny jest z ponizszej tabliczki.Gestosc pradu wynosila stale 15 amp. na 50 cm2 powierzchni anody, czas elek¬ trolizy 6 godz. Elektrolit skladal sie z 1000 cm8 roztworu, zawierajacego 50 g dwuweglanu, 110 g boraksu czesciowo rozpuszczonego, czesciowo zas w postaci ciala osadowego i 20 g nadboranu.Przy zawartosci sody 138 g (nasy¬ conej), wzglednie 100 g, wzglednie 69,2 g, wynosila sprawnosc elektrolityczna ko¬ lejno 37%, wzglednie 33,4%, wzgle¬ dnie 29,5 %.Wyniki te nie byly zgóry przewi¬ dziane, poniewaz spodziewano sie, ze zawartosc boraksu w lugu wzrastajaca przy zmniejszaniu sie stezenia sody be¬ dzie oddzialywala dodatnio na wytwa¬ rzanie sie nadboranu. PLIn the preparation of alkaline perborate by electrolysis of mixtures of alkaline carbonate and alkaline borate solutions, it has been found that the excess of alkaline carbonate contributes to the reaction favorably. On this principle, care must be taken in the production of, for example, sodium perborate that a saturated soda solution is always present. The best way to work is when the soda exists permanently as a sediment, or the complete saturation of the soda solution is thereby ensured. To achieve the desired goal, the soda is topped up continuously or in short intervals, as far as the perborate formation requires. You can also do this by adding as much soda in the top as is needed to convert to perborate. At the end of the electrolysis, make sure that there is no undissolved soda at all or only a little, so as not to dilute the final product. The soda concentration exerts on the electrolytic efficiency is shown in the table below. The current density was constantly 15 amps. for 50 cm 2 of the anode surface, electrolysis time 6 hours. The electrolyte consisted of 1000 cc of a solution containing 50 g of bicarbonate, 110 g of borax partially dissolved, partially in the form of a sediment and 20 g of perborate. With a sodium content of 138 g (saturated) or 100 g or 69.2 g respectively. , was an electrolytic efficiency of 37% or 33.4% or 29.5%, respectively. These results were not anticipated in advance, as it was expected that the borax content in the slurry would increase with the decrease in the concentration of soda ash. the day had a positive effect on the production of perborate. PL

Claims

1. Patent claim. A method of electrowinning an alkaline perborate from a mixture of an alkaline carbonate solution and an alkaline borate, whereby, for the permanent presence of a solution saturated with alkaline carbonate, it is first of all ensured that the alkaline carbonate is always present as a sediment. ZAEt.GMF.KCZIA * f «CH IN WARSAW PL