Naphthalin-1,5-disulfonsure

Bezeichnung:Naphthalin-1,5-disulfonsure

CAS-Nr81-04-9

Englisch Name:1,5-Naphthalenedisulfonic acid

CBNumberCB8346027

SummenformelC10H8O6S2

Molgewicht288.3

MOL-Datei81-04-9.mol

Synonyma

Naphthalin-1,5-disulfonsure

Naphthalin-1,5-disulfonsure physikalisch-chemischer Eigenschaften

Schmelzpunkt	242.5°C (rough estimate)
Siedepunkt	400.53°C (rough estimate)
Dichte	1.7040
Dampfdruck	0Pa at 25℃
Brechungsindex	1.5630 (estimate)
storage temp.	Store below +30°C.
pka	-0.60±0.40(Predicted)
Farbe	Crystals or plates
Wasserlöslichkeit	90.52g/L at 25℃
LogP	-0.94
CAS Datenbank	81-04-9(CAS DataBase Reference)
EPA chemische Informationen	1,5-Naphthalenedisulfonic acid (81-04-9)

Sicherheit

Kennzeichnung gefährlicher	C
R-Sätze:	34
S-Sätze:	22-24/25-45-36/37/39-26
RIDADR	UN 2585
WGK Germany	1
HazardClass	8
PackingGroup	III
HS Code	2904100090
Toxizität	LD50 orl-rat: 30 g/kg GISAAA 45(3),73,80

Gefahreninformationscode (GHS)

1,5-Naphthalenedisulfonic acid Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R34:Verursacht Verätzungen.
S-Sätze Betriebsanweisung:
S22:Staub nicht einatmen.
S24/25:Berührung mit den Augen und der Haut vermeiden.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn möglich, dieses Etikett vorzeigen).
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
Chemische Eigenschaften
Naphthalene-1,5-disulfonic acid [81-04-9]. Armstrong acid, C10H8O6S2, Mr 288.28, crystallizes as the tetrahydrate but dehydrates at 125 ℃ to give the anhydrous acid (mp 240 – 245℃). The disulfonic acid forms an anhydride when treated with oleum below 50℃. This anhydride reacts with ammonia to give a mixture of naphthalene-1,5-disulfonamide and naphthalene-1- sulfonamide-5-sulfonic acid. Treatment of the disodium salt of naphthalene-1,5-disulfonic acid with phosphorus pentachloride at 110℃ gives naphthalene-1,5-disulfonyl chloride (mp 184 ℃), which may also be prepared by chlorosulfonation of naphthalene. Reaction of an aqueous solution of naphthalene-1,5-disulfonic acid with bromide – bromate gives 1,5-dibromonaphthalene so readily that the yellow precipitate may be used to identify very low concentrations of the disulfonic acid.
Verwenden
The disodium salt of naphthalene-1,5- disulfonic acid gives 1-hydroxynaphthalene-5- sulfonic acid or 1,5-dihydroxynaphthalene (see Section 3.3) by fusion processes. Further sulfonation of the disulfonated reaction mixture gives naphthalene-1,3,5-trisulfonic acid, and nitration leads to 1- and 2-nitronaphthalene-4,8-disulfonic acids as intermediates to the corresponding aminonaphthalene disulfonic acids. Naphthalene-1,5-disulfonic acid is an important stabilizer for diazo compounds.
Vorbereitung Methode
Naphthalene is mixed with 20 % oleum at 20 – 35 C followed by gradual addition of 65 % oleum and further naphthalene alternately. After heating for 6 h at 55 C the reaction mixture is added to water, and the product is precipitated as the free acid by cooling or as the disodium salt by the addition of alkaline sodium sulfate. In each case, the isolated yield is ca. 53 %. The 1,6-disulfonic acid can be recovered from the filtrate. Higher yields of 4 have been reported for alternative processes; for example, solvent sulfonation with sulfur trioxide and chlorosulfonic acid in a solvent such as tetrachloroethylene [24] or sulfonation with oleum through a double screw-feed apparatus.
Definition
ChEBI: Naphthalene-1,5-disulfonic acid is a naphthalenesulfonic acid.
Flammability and Explosibility
Not classified
Sicherheitsprofil
Very low oral toxicity. Whenheated to decomposition it emits toxic fumes of SOx. Seealso SULFONATES.

1,5-Naphthalenedisulfonic acid Upstream-Materialien And Downstream Produkte

Naphthalin-1,5-disulfonsure Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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