Bernsteinsureanhydrid Chemische Eigenschaften,Einsatz,Produktion Methoden
ERSCHEINUNGSBILD
FARBLOSE KRISTALLE ODER FLOCKEN
CHEMISCHE GEFAHREN
Zersetzung beim Erhitzen unter Bildung reizender Rauche.
ARBEITSPLATZGRENZWERTE
TLV nicht festgelegt (ACGIH 2005).
MAK nicht festgelegt (DFG 2006).
AUFNAHMEWEGE
Aufnahme in den Körper durch Inhalation und durch Verschlucken.
INHALATIONSGEFAHREN
Eine schädliche Partikelkonzentration in der Luft kann schnell erreicht werden.
WIRKUNGEN BEI KURZZEITEXPOSITION
WIRKUNGEN BEI KURZZEITEXPOSITION: Der Stoff ist stark reizend auf die Augen und reizend auf die Atemwege.
LECKAGE
Persönliche Schutzausrüstung: Atemschutzgerät, P1-Filter für inerte Partikel. Verschüttetes Material in abgedeckten Behältern sammeln; falls erforderlich durch Anfeuchten Staubentwicklung verhindern.
R-Sätze Betriebsanweisung:
R36/37:Reizt die Augen und die Atmungsorgane.
R22:Gesundheitsschädlich beim Verschlucken.
S-Sätze Betriebsanweisung:
S25:Berührung mit den Augen vermeiden.
Beschreibung
Succinic anhydride, also called di hydro - 2,5- furandione , is an organic compound with the molecular formula C
4H
4O
3.This colorless solid is the acid anhydride of succinic acid.
Chemische Eigenschaften
Succinic anhydride is an odourless, colourless needle-like or white crystalline solid natural product. Molecular formula C4H4O3, molecular weight 100.07 g/mol, relative density 1.503, melting point 237 °F. 239 °F at 5 mmHg, 239 °F at 198 °F and 1 mmHg. Soluble in chloroform, carbon tetrachloride, and ethanol; very slightly soluble in ether and water (insoluble in water). Moderately toxic and irritating, emits pungent and irritating fumes when heated to decomposition.
Chemische Eigenschaften
fine white crystalline solid
Verwenden
Succinic Anhydride is an acidulant that hydrolyzes very slowly to
succinic acid in water. it has thermal stability and a low melting
point of 118°c which permits it to be used in products at compara-
tively low temperatures. it is used as a leavening acidulant for bak-
ing powder.
Application
Alkyl succinic anhydride (ASA) is used as a sizing agent or wet strength additive in paper production.
Vorbereitung Methode
The compound is produced from succinic anhydride and
hydrogen peroxide . This material must be stabilized by
using a dehydrating agent such as disodium sulfate or
magnesium sulfate.
synthetische
A solution of succinic acid (500 mg, 42 mmol) and triethylamine (1.23 mL, 42 mmol) in anhydrous THF (120 mL) was allowed to react with triphosgene (42 mg, 7.0 mmol) at ice-water temperature for 10 min. The reaction mixture was subsequently stirred for a further 15 min at room temperature. The solution was then filtered, and the filtrate was concentrated to dryness. The residue was crystallized from ethyl acetate to afford the desired product as white crystals (370 mg, 85%).
Allgemeine Beschreibung
Succinic anhydride is a cyclic anhydride of succinic acid with a five-membered ring. It is widely used in the manufacture of polymeric materials, pharmaceuticals, agrochemicals, dyes, surface-active agents, and organic flame-retardant materials. It also finds application as a cross-linking agent in ion-exchange membranes and a curing agent for epoxy resins.
Allgemeine Beschreibung
Colorless needles or white crystalline solid. Melting point 237°F. Sublimes at 239°F at 5 mm Hg pressure; and at 198°F and 1 mm Hg pressure. Moderately toxic and an irritant.
Air & Water Reaktionen
Reacts slowly with water. Insoluble in water.
Reaktivität anzeigen
Succinic anhydride reacts exothermically with water. Reactions are usually slow, but might become violent if local heating accelerates their rate. Acids accelerate the reaction with water. Incompatible with acids, strong oxidizing agents, alcohols, amines, and bases.
Brandgefahr
Flash point data for Succinic anhydride are not available, however, Succinic anhydride is probably combustible.
Sicherheitsprofil
Experimental teratogenic effects. Moderately toxic by ingestion. A severe eye irritant. Mutation data reported. Questionable carcinogen with experimental neoplastigenic data. When heated to decomposition it emits acrid smoke and irritating fumes. See also ANHYDRIDES.
läuterung methode
Crystallise the anhydride from redistilled acetic anhydride or CHCl3, then filter, wash with diethyl ether and dry it in a vacuum. [Beilstein 17 H 606, 17 V 6.]
Bernsteinsureanhydrid Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
