SI9011405A

SI9011405A - Aqueous solution of a stabilized hydrogen peroxide and procedure for stabilization of the aqueous solution of hydrogen peroxide

Info

Publication number: SI9011405A
Application number: SI9011405A
Authority: SI
Inventors: Dirck Van Hemelrijk
Original assignee: Interox Sa
Priority date: 1989-07-20
Filing date: 1990-07-18
Publication date: 1997-06-30
Also published as: HRP920928A2

Abstract

Vodna raztopina vodikovega peroksida, stabilizirana z uvajanjem preparata, ki vsebuje zmes pirofosfata alkalne ali zemeljsko alkalne kovine s stabilizatorjem, ki spada v razred aminopolikarboksilnih kislin, ki ustrezajo naslednji splošni formuli: HOOC-CHo CB2-COOH \ / N-(CH2)x-CH-{CH2)y-N / I \ H00C-CH2 OH ch2-cooh kjer je x število enako 0, 1 ali 2 in y število enako 0,1 ali 2 in soli teh kislin. Raztopina se uporablja za beljenje tekstila in papirnih kaš.Hydrogen peroxide aqueous solution, stabilized by introducing a preparation containing the mixture pyrophosphate of alkali or alkaline earth metal s to stabilizers belonging to the class of aminopolycarboxyls acids corresponding to the following general formula: HOOC-CHo CB2-COOH \ / N- (CH2) x-CH- {CH2) y-N / I \ H00C-CH2 OH ch2-cooh where x is 0, 1 or 2 and y is 0.1 or 2 and salts of these acids. The solution is used for bleaching of textiles and pulp.

Description

VODENI RASTVOR STABILISANOG VODONIK PEROKSIDA I POSTUPAK ZA STABILIZACIJU VODENOG RASTVORA VODONIK PEROKSIDAAqueous solution of stabilized hydrogen peroxide and process for stabilizing aqueous solution of hydrogen peroxide

Predmetni pronalazak se odnosi na vodene rastvore vodonik peroksida stabilisane protiv razlaganja na kiseonik i vodu pomodu preparata koji sadrži organske stabilizatore iz familije aminopolikarboksilnih kiselina.The present invention relates to aqueous solutions of hydrogen peroxide stabilized against decomposition to oxygen and water by means of a composition containing organic stabilizers of the aminopolycarboxylic acid family.

Postupak stabilizacije vodenih rastvora vodonik peroksida pomodu takvih stabilizatora opisuje se podjednako u datom pronalsku.The process of stabilizing aqueous solutions of hydrogen peroxide using such stabilizers is described equally in the present invention.

Poznata je upotreba l,3-diamino-2-hidroksipropan-N,N,N^z,N''tetrasirdetne kiseline za stabilizaciju perjedinjenja (GB1383741 (CIBA-GEIGY,AG,)* strana 1, redovi 44-61*). Ovo jedinjenje nije medjutim stabilno u prisustvu perjedinjenja i transformiše se brzo tokom magacioniranja u date nascetne proizvode razlaganja koji ne poseduju više efekat stabilizacije za rastvore perjedinjenja.The use of 1,3-diamino-2-hydroxypropane-N, N, N ^z , N''tetrasyridic acid for stabilizing the compound is known (GB1383741 (CIBA-GEIGY, AG,) * page 1, lines 44-61 *). This compound, however, is not stable in the presence of the compound, and is rapidly transformed during the magnanimation into given bulk decomposition products that no longer have a stabilizing effect for the solutions of the compound.

Pronalazak ima za predmet rastvore vodonik peroksida efikasno stabilisane za duže vreme ugradjivanjem preparata koji sadrži aminopolikarboksilnu kiselinu.The invention relates to the subject of hydrogen peroxide solutions effectively stabilized over a long period by incorporating a preparation containing aminopolycarboxylic acid.

Stoga, pronalazak se odnosi na vodeni rastvor vodonik peroksida stabilisan pomodu preparata koji sadrži smešu pirofosfata alkalnog ili zemnoalkalnog metala sa stabilizatorom koji pripada klasi aminopolikarboksilnih kiselina# gde stabilizator je aminopolikarboksilna kiselina kojoj odgovara slededa opšta formule:Thus, the invention relates to an aqueous solution of hydrogen peroxide stabilized by a composition comprising a mixture of alkali or alkaline earth metal pyrophosphates with a stabilizer belonging to the class of aminopolycarboxylic acids # where the stabilizer is an aminopolycarboxylic acid to which the following general formulas correspond:

HOOC-CH₂ HOOC-CH ₂

CH₂-COOHCH ₂ -COOH

N-(CH₂)_x-CH-(CH₂)_y-N hooc-ch₂ N- (CH ₂ ) _x -CH- (CH ₂ ) _y -N hooc-ch ₂

OH ch₂-cooh gde x je broj jednak 0,1 ili 2, i y je broj jednak 0,1 ili 2, ili so ove kiseline.OH ch ₂ -cooh where x is a number equal to 0.1 or 2, and y is a number equal to 0.1 or 2, or a salt of this acid.

Pod vodenim rastvorom vodonik peroksida, podrazumevaju se svi vodeni rastvori vodonik peroksida čija ravnotežna koncentracija je izmedju 0,1 i 99g H₂0₂/100g rastvora i,poželjno je izmedju o,5 i 95%.Podesno,ovaj rastvor može biti rastvor komercijalnog vodonik peroksida ravnotežne koncentracije izmedju 25 i 70g H₂0₂/100g rastvora.Aqueous hydrogen peroxide solution means all aqueous hydrogen peroxide solutions whose equilibrium concentration is between 0.1 and 99g H ₂ 0 ₂ / 100g solution and, preferably, between o, 5 and 95%. Suitably, this solution may be a commercial solution. hydrogen peroxide of equilibrium concentration between 25 and 70g of H ₂ 0 ₂ / 100g of solution.

Najčešče je podesno da u ©pčtoj¹ formuli aminopolikarboksilne kiseline, brojevi x i y budu takvi da njihov zbir ne prelazi 3,i poželjno ne prelazi 2.It is most often appropriate that in formula ^{1 of an} aminopolycarboxylic acid, the numbers xiy be such that their sum does not exceed 3, and preferably does not exceed 2.

Prema drugoj varijanti postupka prema pronalsku,koja je poželjna, aminopolikarboksilna kiselina koja se upotrebljava je takva da brojevi x i y u datoj formuli su jednaki.According to another embodiment of the invention, which is preferred, the aminopolycarboxylic acid used is such that the numbers x and y in the formula are equal.

Aminopolikarbokslina kiselina koja daje rezltate naročito inetere santne je l,3-diamino-2-hidroksi-propan-N,N,N'',N''-tetrasirčetna kiselina. Prema jednoj dopusnkoj varijanti postupka prema pronalasku,brojevi x i y opšte formule aminopolikarboksilne su takvi da je ge jedan od njih nula.U slučaju potrebe, požel jno je da drugi broj bude različit od nule,na primer jednak 1.The aminopolycarboxylic acid that gives the results of especially santeric initer is 1,3-diamino-2-hydroxy-propane-N, N, N '', N '' - tetrasuric acid. According to one admissible variant of the process according to the invention, the numbers x and y of the general formula of aminopolycarboxyl are such that it is one of them zero.

Prema pronlasku, soli aminopolikarboksilne kiseline obuhvataju soli dobivene supstitučijom atoma vodonika jedne ili više od 4 karboksilnih grupa aminopolikarboksilne kiseline sa katjonomAccording to the invention, aminopolycarboxylic acid salts include salts obtained by substitution of a hydrogen atom of one or more than 4 carboxylic groups of aminopolycarboxylic acid with a cation

3.3.

metala ili amonijuma. Katjon metala je poželjno katjon alkalnog ili zemnoalkalnog metala.Alkalni metali i amonijum su naročito preporučljivi.metal or ammonium. A metal cation is preferably an alkali metal or alkaline earth cation. Alkali metals and ammonium are particularly recommended.

Termin aminokarboksilat označiče ovde kasnije aminopolikarboksilne kiseline i njihove soli prema pronlasku.The term aminocarboxylate means hereinafter the aminopolycarboxylic acids and their salts according to the invention.

U preparatima stabilizatora koji odgovaraju pronalsku,proporcija ravnotežna pirofosfata i aminopolikarboksilata može da varira izmedju 02 -4,0i, poželjno izmedju 0/7-1,3. Odlični rezultati su dobiveni za dati ravnotežni odnos pirofosfat/aminopolikarboksilat jednak 1,0.In stabilizer compositions according to the invention, the proportion of equilibrium pyrophosphate and aminopolycarboxylate may vary between 02 -4.0i, preferably between 0 / 7-1.3. Excellent results were obtained for a given pyrophosphate / aminopolycarboxylate equilibrium of 1.0.

Optimalni sadržaj preparata pirofosfat-aminopolikarboksilat u vodenim rastvorima vodonik peroksida zavisi od raznih parametara, takvih kao koncentracija rastvora u vodonik peroksidu,pH i zatim odabranog aminokarboksilata. Praktično, opšte je poželjno da vodeni rastvor vodonik peroksida sadrži bar 0,5mg preparata pirofosfat-aminopilikarboksilat na kg rastvora, i poželjno ne više od 1500mg. Poželjni sadržaji idu izmedju 1 i 300mg.The optimum content of the pyrophosphate-aminopolycarboxylate preparation in aqueous hydrogen peroxide solutions depends on various parameters, such as the concentration of the solution in hydrogen peroxide, pH and then the selected aminocarboxylate. In practice, it is generally preferred that the aqueous hydrogen peroxide solution contains at least 0.5mg of pyrophosphate-aminopylycarboxylate preparation per kg of solution, and preferably not more than 1500mg. Preferred contents range between 1 and 300mg.

Pronalazak se nezavisno primenjuje na rastvore vodonik peroksida, koji su kiseli,neutra-ni ili bazni. Nalazi značajnu podesnu primenu za kisele rastvore čije pH je izmedju 2 i 5.The invention is independently applied to hydrogen peroxide solutions, which are acidic, neutral or basic. It finds significant suitable use for acidic solutions whose pH is between 2 and 5.

Primeri takvih rastvora su rastvori vodonik peroksida koriščeni za čiščenje optičkih stakala,naročito kontaktnih sočiva, rastvori Η2θ2 ^za hidrometalurgiju,tačnije za ekstrakciju metala luženjem minerala,rastvori ^za graviranje,dekapiranje i poliranje metala (na primer,kupatila za hemijsko poliranje bakroreza, takvakao ona opisana i patentnoj prijavi FR-A-87.13407 (SOLVAY & Cie)),rastvori koriščeni za zaštitu okoline,kao oni koriščeni za detoksikaciju eluentskih tečnosti ili gasbva i oni koriščeni za prečiščevanje vode, rastvori HjOj koriščeni u prehambenoj industriji i tačnije oni koji služe u dezinfekciji ambalaže i recipenata.Examples of such solutions are hydrogen peroxide solutions used for cleaning optical glasses, in particular contact lenses, θ2θ2 solutions ^for hydrometallurgy, more specifically for metal extraction by leaching of minerals, solutions ^for engraving, pickling and polishing metals (for example, baths for chemical polishing of copper, such as and patent application FR-A-87.13407 (SOLVAY & Cie)), solutions used for environmental protection, such as those used for detoxification of eluent liquids or gas, and those used for water purification, HjOj solutions used in the food industry, and more specifically those used for disinfection packaging and receivers.

4.4.

Prema jednom obliku podesne realizacije pronalaska,vodeni rastvor vodonik peroksida može biti vodeno kupatilo za beljenje koje sadrži vodonik peroksid u koncentraciji izmedju 0,5 i 50g H^O^lOOg rastvora.Primeri takvih kupatila za beljenje su miksture za pranje ili kupatila za beljenje vodonik peroksidom tekstilnih materijala ili papirne kaše.According to one embodiment of the invention, an aqueous hydrogen peroxide solution may be an aqueous bleaching bath containing hydrogen peroxide at a concentration of between 0.5 and 50 g of H ^ O ^ lOOg solution. Examples of such bleaching baths are washing mixtures or hydrogen bleaching baths. peroxide of textile materials or pulp.

U tehnici za beljenje papirne kaše pomoču vodenih rastvora vodonik peroksida,,može se ponekad javiti podesnim perthodno tretiranje papirne kaše u beljaču.sa&preparatom pirofosfataminopolikarboksilat tipa onih koriščenih prema pronalsku takvima. kao što je definisano napred, pre izvodjenja tretmana beljenja sa vodonik peroksidom. Ova poslednja tehnika je naročito interesantna jer kaša beljača pripada klasi kašavispkogcpninosa.In the technique of bleaching pulp with the aid of aqueous solutions of hydrogen peroxide, it may sometimes be appropriate to first treat the pulp in bleach. With < Desc / Clms Page number 2 > a pyrophosphataminopoly carboxylate type preparation of those used according to the invention. as defined above, prior to performing hydrogen peroxide bleaching treatments. This last technique is especially interesting because the porridge of the egg whites belongs to the class of porridge.

Pronalazak se takodje odnosi na postupak stabilizacije vodenog rastvora vodonik peroksida prema kome se uvodi u vodeni rastvor preparat koji sadrži smešu pirofosfata alkalnog ili zemnoalkalnog metala sa stabilizatorom koji pripada klasi aminopolikarboksilnih kiselina kojima odgovara sledeča opšta formule:The invention also relates to a process for stabilizing an aqueous solution of hydrogen peroxide, whereby a composition comprising a mixture of alkaline or alkaline earth metal pyrophosphates with a stabilizer belonging to the class of aminopolycarboxylic acids according to the following general formulas is introduced into an aqueous solution:

HOOC-CH2 \HOOC-CH2 \

N-(CH2)_x-CH-(CH₂)y-N / I \N- (CH 2) _x -CH- (CH ₂ ) y N / I \

HOOC-CH2 θ^Η CH₂-C00H gde x je broj jednak 0,1 ili 2 i y je takodje broj koji je jednak 0,1 ili 2, ili soli ovih kiselina.HOOC-CH2 θ ^Η CH ₂ -C00H where x is a number equal to 0.1 or 2 and yy is also a number equal to 0.1 or 2, or salts of these acids.

Pronalazak/predstavlja podesno obezbedjivanje vodenih rastvora vodonik peroksida čija je stabilnost za duže vreme poboljšana sobzirom na razlaganje izazvano sa katjonima teških metala iThe invention / represents a suitable provision of aqueous solutions of hydrogen peroxide whose stability has been improved over a long period of time due to the decomposition caused by heavy metal cations and

CH2-COOH /CH2-COOH /

prelaznih metala prema izveštaju u odnosu na poznate orgnanske i neorganske stabilizatore. Neograničavajuči primeri koji slede su dati samo radi ilustrovanja pronalaska.of transition metals according to the report with respect to known organ and inorganic stabilizers. The following non-limiting examples are given merely to illustrate the invention.

PRIMERI IR do 14EXAMPLES IR to 14

Pasivizacija opremePassivation of equipment

Oprema koriščena u svim primerima koji slede,podvrgnuta je prethodno tretmanu pasivizacije radi eliminisanja štetnog efekta nečistoča adsorbovanih na površini u kontaktu sa primenjenim stabilisanim rastvorima vodonik peroksida.The equipment used in all of the following examples has been subjected to pre-passivation treatment to eliminate the harmful effect of impurities adsorbed on the surface in contact with the applied stabilized hydrogen peroxide solutions.

Radi ovoga, uranjana je sva staklarija koja če biti u kontaktu sa Η₂°2 ^{u v}°d^eni rastvor ENO^ koncentracije 65% masenih i držana na temperaturi od 75°C tokom 24 časa.We ovoga, uranjana is we staklarija Koja provided to be in contact with Η ₂ ° 2 ° ^uv d ^one and the solution ONE ^ concentration of 65% of the strips and held at a temperature of 75 ° C during 24 hours.

Proveravnja stabilnosti na duše vremeChecking for stability for a long time

U erlenmajer od 1 litra pasiviran kao što je napred opisano unosi se 85% mas. vodeni rastvor vodonik peroksida, bidestilovana voda, stabilizator i rastvor jona metala koji sadrži FeCl^ i CuCl₂u količini od 5 mola FeCl^ i 1 mol CUCI2. Količine raznih koriščenih sastojaka su računate za pravljenje 2 tipa krajnje smeše koja sadrži respektivno 35g rastvora i 70g ^C^/loog rastvora zatim 5mg metala (npr. Fe+Cu) na kg rastvora i 250mg stabilizatora (na 100% aktivnog materijala) na kg rastvora.In a 1 liter conical flask passivated as described above, 85% wt. aqueous hydrogen peroxide solution, bidistilled water, stabilizer, and metal ion solution containing FeCl ^ and CuCl ₂ in an amount of 5 moles of FeCl ^ and 1 mol of CUCI2. The amounts of the various ingredients used were calculated to make 2 types of final mixture containing respectively 35g of solution and 70g ^ C ^ / loog solution followed by 5mg of metal (eg Fe + Cu) per kg of solution and 250mg of stabilizer (per 100% of active material) per kg of the solution.

Dobiveni rezultati su dati u tabelama 1 afc-35% mas. H₂O₂) i II (70% mas. H₂O₂) koje slede.The results obtained are given in Tables 1 afc-35% wt. H ₂ O ₂ ) and II (70% wt. H ₂ O ₂ ) following.

U sipitivanjima 5R, 7, 12R i 14 gde je primenjena smeša stabilizatora, uvedeno je 125mg svakog od dva stablizoatora na kg rastvora.In the 5R, 7, 12R and 14 tests where a stabilizer mixture was applied, 125 mg of each of the two stabilizers per kg of solution was administered.

6.6.

Imena stabilizatora koji su korišdeni su jedan deo 1,3-diamino2-hidroksipropan-N,N,N',N^-tetrasirčetne kiseline (niže skračeno DPTA) prema pronlasku i,drugi deo je izvestan broj stabilizatora koji su poznati i ne pripadaju pronalskau, koji pripadaju dvema različitim grupama, jedan je polifosfonat proizvod firme Monsanto i prodavan pod markom proizvoda DEQUEST, i dva stabilizatora neorganskog tipa. Ovi razni stabilizatori su primenjivani sami ili u smeši i označeni su skračenicama kao što sledi:The names of the stabilizers used are one part of 1,3-diamino2-hydroxypropane-N, N, N ', N ^ -tetrasuric acid (lower abbreviated DPTA) according to the invention and, the second part is a number of stabilizers which are known and do not belong to the invention. , belonging to two different groups, one is a polyphosphonate product of Monsanto and sold under the DEQUEST brand, and two inorganic stabilizers. These various stabilizers are applied alone or in a mixture and are abbreviated as follows:

PYRO: Na₂H₂P₂O^ : natrijum pirofosafatPYRO: At ₂ H ₂ P ₂ O ^: sodium pyrophosphate

STAN: Na₂SnO₃: natrijum stanatFLAT: Na ₂ SnO ₃ : sodium stanat

D2066: Dietilentriaminopenta (natrijum metilenfosfonat), gde skračenica D2066 simbolizuje proizvod DEQUEST®,firme Monsanto.D2066: Diethylenetriaminopenta (sodium methylenephosphonate), where the abbreviation D2066 symbolizes the product Monsanto from DEQUEST®.

rabe iathey use ia

•4- • 4- 1—- •H λ a: b ,rt . „ tr· . b^ 1—- • H λ a: b, rt. „Tr ·. b ^ 1 1 1 1 69,6 1 1 1 69,6 1 1 1 sr •k i—1 -4- sr • k and — 1 -4- cO «* r-l M? cO «* r-l M? 51,6 51.6 O Oh CM O CM ca CM Oh CM ca. 1 1 10 •k o rH 10 • k o rH 1 1 m o CM m o CM m CO rH m CO., LTD rH r- ' \0 vl r- '\ 0 vl CM m CO CM m CO., LTD cn -H 0 Φ (0 Φ cn -H 0 Φ (0 Φ 1 •H ' •S s rt* tT* b 1 • H ' • S s rt * tT * b 1 1 cn tH VO cn tH VO 1 1 cr» 00 CM cr » 00 CM rK •k m rK • k m co •k 00 CO co • k 00 CO., LTD o o CM O CM m CM Oh CM m 1 1 m co T“( m co T "( 1 1 Ci sr CM Ci sr CM m 10 rM m 10 rM tH rH CM tH rH CM sr •k m n sr • k m n e % Φ i-1 m OJ 0 10' u e % Φ i-1 m OJ 0 10 ' in 1 •H Λ AS·« Cn b 1 • H Λ AS · « Cn b 1 1 σι r* sr σι r * sr 1 1 co O CM co Oh CM r*» ·» 00 co r * » · » 00 co CO σ* CM CO., LTD σ * CM o o CM o CM X M CM o CM X M 1 1 CM 00 t—1 CM 00 t — 1 1 1 σ\ r*» CM σ \ r * » CM <r rH CM <r rH CM «4- sr CM «4- sr CM o in on o and he laliza rastvo: 1 laliza rastvo: 1 “H •9 X» p rt* bi b “H • 9 X » p rt * bi b σι •k •4- σι σι • k • 4- σι i—< ·* O CO i— < · * Oh CO., LTD CM on Ci CM he Ci r^· »k r- r ^ · »K r- m CO CM m CO., LTD CM σι in rM σι and rM o o CM O CM S-i n CM Oh CM S-i n z**> * s-z o CM z **> * s-z o CM ST •k CM ST • k CM sT «k CM sT «K CM co CM CO co CM CO., LTD VO CM VO CM O •k CM Oh • k CM o in cn o and cn An 0 An 0 'i ’·^ bi b 'and' · ^ bi b o o o o o o o o o o o o o o CM O H CM ca CM O H CM ca. Ci sr m Ci sr m Cl ST cn Cl ST cn CM •k m CO CM • k m CO., LTD o •k in CO o • k and CO., LTD Ci «4· on Ci «4 · he m sr m m sr m Cl sr cn Cl sr cn priroda stabiliza- tora nature stabiliza- torah Λ £ Φ a Λ £ Φ a o & Am o & Am Č CM Q Č CM Q 10 1O O CM a 10 1O Oh CM a O Z CM + 10 10 O CM Q Oh Z CM + 10 10 Oh CM Q H w H w o Č CM + < H CM a o Č CM + < H CM a br. opita no. experiment P5 rH Q5 rH P4 CM P4 CM co co AS sr AS sr & m & m AS 10 AS 10 r- r-

(*) posle 1 dana(*) after 1 day

Tabela IITable II

sr sr 1 ' tn+J 1 ' tn + J 1 1 sl- in m sl- and m 1 1 30,4 30.4 39,6 39.6 r* co co r * co co <· i-H <· i-H «n o CN Ed «N o CN Ed i i *k CO * k CO., LTD 1 1 σ\ •w 00 si σ \ • w 00 si r-4 CN r-4 CN NO NO sr NO NO sr *» co V0 * » co V0 CO •H O 0) CO CO., LTD • H Oh 0) CO., LTD Si« &1+) Si « & 1 +) 1 1 m in sr m and sr 1 1 CO O CN CO., LTD Oh CN Oh «* rN CO Oh «* rN CO., LTD CN <—1 CN CN <—1 CN e> •t o e> • t o CN O CN H ta CN Oh CN H this one 1 1 o ·» CO CO o · » CO., LTD CO., LTD 1 1 o no m o no m m r- sr m r- sr sr ·> m m sr ·> m m iH ·» O xo iH · » Oh xo B Φ i-H CO CN 0 & «J B Φ i-H CO CN 0 & «J gubi- tak lose- tak 1 1 r* O CO r * Oh CO., LTD 1 1 < sr r+ < sr r + rH r* CN rH r * CN sr sf r+ sr sf r + o o CN O CN K ta CN Oh CN K this one 1 1 cn CO «e cn CO., LTD «E 1 1 CN O NO CN Oh NO 00 ·* o m 00 · * o m CN O lO CN Oh lO CN ·* o (s. CN · * o (s. aliza rastvoi 1 aliza rastvoi 1 •H 91* d n) tn+J • H 91 * d n) tn + J rd r* 00 rd r * 00 CO m r—l CO., LTD m r — l o CO 00 o CO., LTD 00 sr m sr m V0 rH rH V0 rH rH «H in «H and o o CN O CN ta CN Oh CN this one z*s H \-z O cn z * s H \ -z Oh cn ΓΧ ·» 00 m ΓΧ · » 00 m sr co sr co m VO \O m VO \ O NO »» i—1 Ό NO »» and — 1 Ό Px r» %o \O Px r » % o \ O σι cn νο σι cn νο An ⁰ 1An ⁰ 1 l’ •H d «s tn+J l ' • H d «s tn + J O Oh o o o o o o o o o o O Oh CN O H CN cn CN O H CN cn o\ σ> NO o \ σ> NO (s. σ\ NO (s. σ \ NO CN ·* O r*. CN · * Oh r *. CO o (s. CO., LTD o (s. fs. cn \O fs. cn \ O CO O r-. CO., LTD Oh r-. (s. o\ (s. o \ i priroda stabilizator a i nature stabilizer a d) C d) C o ί CM o ί CM c E-< CM Q c E- < CM Q \O Ό O CN O \ O Ό Oh CN Oh D2066+PYRO D2066 + PYRO H CO H CO., LTD DPTA+PYR0 DPTA + PYR0 br . opita no. experiment ta CO this one CO., LTD ca σ> ca. σ> ca o r-t ca. o r-t P4 rH iH P4 rH iH & CN rN & CN rN ca n rd ca. n rd Ν’ tH Ν ' tH

(*) posle 1 dana(*) after 1 day

9.9.

Rezultati jasno pokazuju sinergistiški efkat dat sa DPTA i PYRO potvrdjujudi rešenje prema pronlaksu.The results clearly show the synergistic effect given with DPTA and PYRO confirming the solution according to the finding.

Claims

PATENT APPLICATIONS

An aqueous solution of hydrogen peroxide stabilized by a stabilizer-containing preparation belonging to the class of aminopolycarboxylic acids, characterized in that the composition contains a mixture of alkali or alkaline earth metal pyrophosphate with aminopolycarboxylic acid 1 by the following general formulas:

HOOC-CH2 CH2-COOH

N- (CH ₂ ) _x -CH- (CH ₂ ) _y -N / [\

HOOC-CH2 θ ^Η CH2-COOH where x is equal to 0, 1 or 2 and y is also a number equal to 0, 1 or 2, or with a salt of this acid.

2. A solution according to claim 1, characterized in that x and y are such that their sum does not exceed 3.

3. Solution by having x v and n accord y same with claims value. 1 or 2, indicated by 4. Solution v accord with claims 1 al i 2, indicated by by being one from no x 'al and y ni c.

A solution according to any one of claims 1-4, characterized in that the equilibrium ratio between the alkaline or alkaline earth metal pyrophosphate and the aminopolycarboxylic acid or its salt is between 0.2 and 4.

6.

The solution according to claim 3, characterized in that amiηοροίikarboxy1 per acid is 1, 3-diamino-2-hydroxypropane, Ν, Ν ', Ν′-tetraacetic acid.

The solution according to claims 1-6, characterized in that it is a concentrated commercial solution with a concentration between 0.5 and 9.5% by weight of hydrogen peroxide.

A solution according to one of claims 1-6, characterized in that it is a bath for washing or bleaching textiles.

9. A solution according to any one of claims 1-6, characterized in that it is a pulp bleach mixture.

A process for stabilizing an aqueous solution of hydrogen peroxide with a composition comprising a stabilizer belonging to the class of amio riopol and carboxylic acids, characterized in that it comprises introducing into the solution a mixture of an alkali or earth alkaline pyrophosphate with an aminopolycarboxylic acid, which corresponds to the following general formula:

H00C-CH ₂ ch ₂ -cooh

N- (CH ₂ ) _x -CH- (CH ₂ ) _y -N hooc-ch ₂

OH ch ₂ -cooh where x is a number equal to 0, 1 or 2 and y is also a number equal to 0, 1 or 2, or with a salt of this acid.