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Oxalsäure Produkt Beschreibung

Oxalic acid Struktur
144-62-7
CAS-Nr.
144-62-7
Bezeichnung:
Oxalsäure
Englisch Name:
Oxalic acid
Synonyma:
oxalic;Aktisal;Aquisal;caosuan;HOOCCOOH;BETZ 0295;Kleesαure;Oxaalzuur;Oxalsαure;DeerClean
CBNumber:
CB0323998
Summenformel:
C2H2O4
Molgewicht:
90.03
MOL-Datei:
144-62-7.mol

Oxalsäure Eigenschaften

Schmelzpunkt:
189.5 °C (dec.)(lit.)
Siedepunkt:
365.1°C (estimate)
Dichte
0.99 g/mL at 25 °C
Dampfdichte
4.4 (vs air)
Dampfdruck
<0.01 mm Hg ( 20 °C)
Brechungsindex
1.4261 (estimate)
Flammpunkt:
101-157°C
storage temp. 
Store below +30°C.
Löslichkeit
water: soluble108g/L at 25°C
Aggregatzustand
Liquid
pka
1.23(at 25℃)
Farbe
White
PH
1 (100g/l, H2O, 20℃)
Säure-Base-Indikators(pH-Indikatoren)
6 - 8 at 25 °C
Wasserlöslichkeit
90 g/L (20 ºC)
Sublimation 
101-157 ºC
Merck 
14,6911
BRN 
385686
Henry's Law Constant
1.43 at pH 4 (quoted, Gaffney et al., 1987)
Expositionsgrenzwerte
NIOSH REL: TWA 1, STEL 2, IDLH 500; OSHA PEL: TWA 1; ACGIH TLV: TWA 1, STEL 2 (adopted).
Stabilität:
Stable, but moisture sensitive. Incompatible with metals.
InChIKey
MUBZPKHOEPUJKR-UHFFFAOYSA-N
CAS Datenbank
144-62-7(CAS DataBase Reference)
NIST chemische Informationen
Oxalic acid(144-62-7)
EPA chemische Informationen
Oxalic acid (144-62-7)
Sicherheit
  • Risiko- und Sicherheitserklärung
  • Gefahreninformationscode (GHS)
Kennzeichnung gefährlicher Xn
R-Sätze: 21/22-63-34-41
S-Sätze: 24/25-23-36/37/39-27-26-39-37-36-36/37
RIDADR  UN 3261 8/PG 3
WGK Germany  1
RTECS-Nr. RO2450000
TSCA  Yes
HazardClass  8
PackingGroup  III
HS Code  29171110
Giftige Stoffe Daten 144-62-7(Hazardous Substances Data)
Toxizität LD50 orally in Rabbit: 375 mg/kg
Bildanzeige (GHS)
Alarmwort Achtung
Gefahrenhinweise
Code Gefahrenhinweise Gefahrenklasse Abteilung Alarmwort Symbol P-Code
H302 Gesundheitsschädlich bei Verschlucken. Akute Toxizität oral Kategorie 4 Warnung P264, P270, P301+P312, P330, P501
H312 Gesundheitsschädlich bei Hautkontakt. Akute Toxizität dermal Kategorie 4 Warnung P280,P302+P352, P312, P322, P363,P501
H318 Verursacht schwere Augenschäden. Schwere Augenschädigung Kategorie 1 Achtung P280, P305+P351+P338, P310
Sicherheit
P280 Schutzhandschuhe/Schutzkleidung/Augenschutz tragen.
P321 Besondere Behandlung
P305+P351+P338 BEI KONTAKT MIT DEN AUGEN: Einige Minuten lang behutsam mit Wasser spülen. Eventuell vorhandene Kontaktlinsen nach Möglichkeit entfernen. Weiter spülen.

Oxalsäure Chemische Eigenschaften,Einsatz,Produktion Methoden

ERSCHEINUNGSBILD

FARBLOSE KRISTALLE ODER WEISSES PULVER.

CHEMISCHE GEFAHREN

Bei Kontakt mit heißen Gegenständen oder Flammen Zersetzung unter Bildung von Ameisensäure und Kohlenmonoxid. Mittelstarke Säure in wässriger Lösung. Reagiert sehr heftig mit starken Oxidationsmitteln unter Feuer- und Explosionsgefahr. Reagiert mit einigen Silberverbindungen unter Bildung explosionsfähigen Silberoxalats.

ARBEITSPLATZGRENZWERTE

TLV: 1 mg/m?(als TWA); 2 mg/m?(als STEL); (ACGIH 2005).
MAK nicht festgelegt (DFG 2006).
EG Arbeitsplatz-Richtgrenzwerte: 1 mg/m?(als TWA); (EG 2006)

AUFNAHMEWEGE

Aufnahme in den Körper durch Inhalation des Aerosols und durch Verschlucken.

INHALATIONSGEFAHREN

Verdampfung bei 20°C vernachlässigbar; eine gesundheitsschädliche Partikelkonzentration in der Luft kann jedoch als Pulver schnell erreicht werden.

WIRKUNGEN BEI KURZZEITEXPOSITION

WIRKUNGEN BEI KURZZEITEXPOSITION:
ätzend. Die Substanz verätzt die Augen, die Haut und die Atemwege. ätzend beim Verschlucken. Inhalation des Aerosols kann zu Lungenödem führen (s.Anm.). Möglich sind Auswirkungen auf die Nieren. Exposition weit oberhalb der Arbeitsplatzgrenzwerte kann zum Tod führen. ärztliche Beobachtung notwendig.

WIRKUNGEN NACH WIEDERHOLTER ODER LANGZEITEXPOSITION

Wiederholter oder andauernder Hautkontakt kann Dermatitis hervorrufen. Möglich sind Auswirkungen auf die Nieren mit nachfolgenden Nierensteinen.

LECKAGE

Verschüttetes Material in Kunststoffbehältern sammeln; falls erforderlich durch Anfeuchten Staubentwicklung verhindern. Reste sorgfältig sammeln. An sicheren Ort bringen. Persönliche Schutzausrüstung: Atemschutzgerät, P2-Filter für schädliche Partikel.

R-Sätze Betriebsanweisung:

R21/22:Gesundheitsschädlich bei Berührung mit der Haut und beim Verschlucken.
R63:Kann das Kind im Mutterleib möglicherweise schädigen.
R34:Verursacht Verätzungen.

S-Sätze Betriebsanweisung:

S24/25:Berührung mit den Augen und der Haut vermeiden.
S23:Gas/Rauch/Dampf/Aerosol nicht einatmen(geeignete Bezeichnung(en) vom Hersteller anzugeben).
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S27:Beschmutzte, getränkte Kleidung sofort ausziehen.
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.

Chemische Eigenschaften

white crystalline powder

Chemische Eigenschaften

Oxalic acid is a colorless, odorless powder, or granular solid. The anhydrous form (COOH)2 is an odorless, white solid; the solution is a colorless liquid.

Physikalische Eigenschaften

Colorless and odorless rhombic crystals. Hygroscopic.

Verwenden

Oxalic acid is made by the action of nitric acid on sugars, starch, or cellulose. This highly poisonous colorless crystal is soluble in water, alcohol, and ether. It was used to make ferric oxalate, as a preservative for pyrogallic acid developers, as a sensitizer for platinum papers, and to reduce the density of cyanotype prints.

Verwenden

An impurity of oxaliplatin which is a coordination complex that is used in cancer chemotherapy.

Verwenden

Oxalic acid was used: · in the synthesis of hemicellulose hydrolysates of yellow poplars; · in the synthesis of three-dimensionally ordered macroporous metal oxides or carbonates via templating with polystyrene spheres; · as supporting electrolyte in the electrochemical synthesis of polyaniline-polypyrrole composite coatings.

Definition

ChEBI: An alpha,omega-dicarboxylic acid that is ethane substituted by carboxyl groups at positions 1 and 2.

Definition

A white crystalline organic acid that occurs naturally in rhubarb, sorrel, and other plants of the genus Oxalis. It is slightly soluble in water, highly toxic, and used in dyeing and as a chemical reagent.

Vorbereitung Methode

Many industrial processes have been employed for the manufacture of oxalic acid since it was first synthesized. The following processes are in use worldwide: oxidation of carbohydrates, the ethylene glycol process, the propylene process, the dialkyl oxalate process, and the sodium formate process. Sodium formate process is no longer economical in the leading industrial countries, except for China.
Nitric acid oxidation is used where carbohydrates, ethylene glycol, and propylene are the starting materials. The dialkyl oxalate process is the newest, where dialkyl oxalate is synthesized from carbon monoxide and alcohol, then hydrolyzed to oxalic acid. This process has been developed by UBE Industries in Japan.Many attempts have been made to synthesize oxalic acid by electrochemical reduction of carbon dioxide in either aqueous or nonaqueous electrolytes.

Reaktionen

The reactions of oxalic acid, including the formation of normal and acid salts and esters, are typical of the dicarboxylic acids class. Oxalic acid, however, does not form an anhydride.
On rapid heating, oxalic acid decomposes to formic acid, carbon monoxide, carbon dioxide, and water. In aqueous solution, it is decomposed by uv, x-ray, or γ -radiation with the liberation of carbon dioxide. Photodecomposition also occurs in the presence of uranyl salts.
Oxalic acid is a mild reducing agent, and is oxidized by potassium permanganate in acid solution to give carbon dioxide and water. Oxalic acid is catalytically reduced by hydrogen in the presence of ruthenium catalyst to ethylene glycol, and electronically reduced to glyoxylic acid.
Oxalic acid reacts with various metals to form metal salts, which are quite important as the derivatives of oxalic acid. It also reacts easily with alcohols to give esters.

Allgemeine Beschreibung

Odorless white solid. Sinks and mixes with water.

Air & Water Reaktionen

Water soluble. Hygroscopic

Reaktivität anzeigen

Oxalic acid is hygroscopic and sensitive to heat. Oxalic acid may react violently with furfuryl alcohol, silver, sodium, perchlorate, sodium hypochlorite, strong oxidizers, sodium chlorite, acid chlorides, metals and alkali metals. . The heating of mixtures of Oxalic acid and urea has lead to explosions. This is due to the rapid generation of the gases, CO2, CO, and NH3, [Praxis Naturwiss. Chem., 1987, 36(8), 41-42]. Oxalic acid and urea react at high temperatures to form toxic and flammable ammonia and carbon monoxide gasses, and inert CO2 gas [Von Bentzinger, R. et al., Praxis Naturwiss. Chem., 1987, 36(8), 41-42].

Health Hazard

As dust or as a solution, can cause severe burns of eyes, skin, or mucous membranes. Ingestion of 5 grams has caused death with symptoms of nausea, shock, collapse, and convulsions coming on rapidly. Repeated or prolonged skin exposure can cause dermatitis and slow-healing ulcers.

Brandgefahr

Special Hazards of Combustion Products: Generates poisonous gases

Landwirtschaftliche Anwendung

Oxalic acid, (COOH)2, also called ethanedioic acid, is a white, crystalline solid, slightly soluble in water. It is a naturally occurring highly oxidized organic compound with significant chelating activity. It is strongly acidic and poisonous, produced by many plants like sorrel (sourwood), the leaf blades of rhubarb, bark of eucalyptus and many plant roots. In plant cells and tissues, oxalic acid gets accumulated as either sodium, potassium or calcium oxalate, of which the latter occurs as crystals. In turn, salts of oxalic acids enter the bodies of animals and human beings, causing pathological disorders, depending upon the amount consumed. Many species of fungi like Aspergillus, Penicillium, Mucor, as well as some lichens and slime moulds produce calcium oxalate crystals. Upon the death of these microorganisms, plants and animals, the salts get released into the soil, causing some amount of toxicity. However, oxalate-degrading microbes, called Oxalobacter formigenes, decrease oxalate absorption in animals and humans.
Oxalic acid is the first of a series of dicarboxylic acids. It is used (a) as a bleaching agent for stains like rust or ink, (b) in textile and leather production, and (c) as monoglyceryl oxalate in the production of ally1 alcohol and formic acid.

Sicherheitsprofil

Poison by subcutaneous route. Moderately toxic by ingestion. A skin and severe eye irritant. Acute oxalic poisoning results from ingestion of a solution of the acid. There is marked corrosion of the mouth, esophagus, and stomach, with symptoms of vomiting, burning abdominal pain, collapse, and sometimes convulsions. Death may follow quickly. The systemic effects are attributed to the removal by the oxalic acid of the calcium in the blood. The renal tubules become obstructed by the insoluble calcium oxalate, and there is profound hdney dlsturbance. The chief effects of inhalation of the dusts or vapor are severe irritation of the eyes and upper respiratory tract, gastrointestinal disturbances, albuminuria, gradual loss of weight, increasing weakness and nervous system complaints, ulceration of the mucous membranes of the nose and throat, epistaxis, headache, irritation, and nervousness. Oxalic acid has a caustic action on the skin and may cause dermatitis; a case of early gangrene of the fingers resembling that caused by phenol has been described. More severe cases may show albuminuria, chronic cough, vomiting, pain in the back, and gradual emaciation and weakness. The skin lesions are characterized by crachng and fissuring of the skin and the development of slow-healing ulcers. The skin may be bluish in color, and the nails brittle and yellow. Violent reaction with furfuryl alcohol, Ag, NaClO3, NaOCl. When heated to decomposition it emits acrid smoke and irritating fumes. See also OXALATES

mögliche Exposition

Oxalic acid is used in textile finishing, paint stripping; metal and equipment cleaning; as an intermediate; as an analytic reagent and in the manufacture of dyes, inks, bleaches, and paint removers; varnishes, wood, and metal cleansers; dextrin, cream of tartar, celluloid, oxalates, tartaric acid, purified methyl alcohol, glycerol, and stable hydrogen cyanide. It is also used in the photographic, ceramic, metallurgic, rubber, leather, engraving, pharmaceutical, paper, and lithographic industries.

Source

Oxalic acid occurs naturally in many plants including buckwheat leaves (111,000 ppm), lambsquarter (140,000 to 300,000 ppm), black pepper (4,000 to 34,000 ppm), star fruit (50,000 to 95,800 ppm), purslane (1,679 to 16,790 ppm), nance bark (27,300 ppm), rhubarb 4,400 to 13,360 ppm), tea leaves (2,192 to 10,000 ppm), bitter lettuce (10,000 ppm), spinach (6,580 ppm), cacao (1,520 to 5,000 ppm), bananas (22 to 5,240 ppm), ginger (5,000 ppm in rhizome), cashews (3,184 ppm), almonds (4,073 ppm), taro roots (1,334 ppm), tamarind (1,960 ppm), garden sorrel (3,000 ppm), mustard green leaves (1,287 ppm), peppers (257 to 1,171 ppm), sweet potato roots (1,000 ppm), pumpkins, oats (400 ppm), tomatillo (109 to 536 ppm), various cabbage leaves (59 to 350 ppm), and horseradish (Duke, 1992).
Oxalic acid was identified as a constituent in a variety of composted organic wastes. Detectable concentrations were reported in all 21 composts extracted with water. Concentrations ranged from 0.60 mmol/kg in a straw + dairy cattle manure to 21.89 mmol/kg in straw + wood bark + dairy cattle manure. The overall average concentration was 9.67 mmol/kg (Baziramakenga and Simard, 1998).

Environmental Fate

Biological. Heukelekian and Rand (1955) reported a 5-d BOD value of 0.12 g/g which is 66.7% of the ThOD value of 0.18 g/g.
Chemical/Physical. At temperatures greater than 189.5 °C, decomposes to carbon dioxide, carbon monoxide, formic acid, and water (Windholz et al., 1983). Ozonolysis of oxalic acid in distilled water at 25 °C under acidic conditions (pH 6.3) yielded carbon dioxide (Kuo et al., 1977). Absorbs moisture in air forming the dihydrate (Huntress and Mulliken, 1941).
Reacts with bases forming water soluble salts.

Versand/Shipping

UN3261 Corrosive solid, acidic, organic, n.o.s., Hazard class: 8; Labels: 8-Corrosive material, Technical Name Required.

Inkompatibilitäten

The aqueous solution is a medium-strong acid. Compounds of the carboxyl group react with all bases, both inorganic and organic (i.e., amines) releasing substantial heat, water and a salt that may be harmful. Incompatible with arsenic compounds (releases hydrogen cyanide gas), diazo compounds, dithiocarbamates, isocyanates, mercaptans, nitrides, and sulfides (releasing heat, toxic, and possibly flammable gases), thiosulfates and dithionites (releasing hydrogen sulfate and oxides of sulfur). Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from silver compounds; strong alkalis; chlorites. Contact with some silver compounds forms explosive materials.

Waste disposal

Pretreatment involves chemical reaction with limestone or calcium oxide forming calcium oxalate. This may then be incinerated utilizing particulate collection equipment to collect calcium oxide for recycling.

Oxalsäure Upstream-Materialien And Downstream Produkte

Upstream-Materialien

Downstream Produkte


Oxalsäure Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

Global( 409)Lieferanten
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0371-55170693
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86-0551-65418684 18949823763
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