Dichlorsilan Chemische Eigenschaften,Einsatz,Produktion Methoden
ERSCHEINUNGSBILD
FARBLOSES GAS MIT CHARAKTERISTISCHEM GERUCH.
PHYSIKALISCHE GEFAHREN
Das Gas ist schwerer als Luft und kann sich am Boden ausbreiten. Fernzündung möglich.
CHEMISCHE GEFAHREN
Kann sich beim Kontakt mit Luft spontan entzünden. Zersetzung beim Erhitzen oder Verbrennen unter Bildung giftiger und ätzender Rauche mit Chlorwasserstoff. Reagiert mit Wasser oder feuchter Luft unter Bildung von Chlorwasserstoff. Greift viele Metalle in Gegenwart von Wasser an.
ARBEITSPLATZGRENZWERTE
TLV nicht festgelegt (ACGIH 2005).
MAK nicht festgelegt (DFG 2005).
AUFNAHMEWEGE
Aufnahme in den Körper durch Inhalation.
INHALATIONSGEFAHREN
Eine gesundheitsschädliche Konzentration des Gases in der Luft wird beim Entweichen aus dem Behälter sehr schnell erreicht.
WIRKUNGEN BEI KURZZEITEXPOSITION
WIRKUNGEN BEI KURZZEITEXPOSITION: Tränenreizend. Die Substanz verätzt die Augen, die Haut und die Atemwege. Inhalation dieser Substanz kann zu Lungenödem führen (s.Anm.). Schnelle Verdampfung kann zu Erfrierungen führen. Exposition gegenüber hohen Konzentrationen kann zum Tod führen. Die Auswirkungen treten u.U. verzögert ein. ärztliche Beobachtung notwendig.
LECKAGE
Gefahrenbereich verlassen! Fachmann zu Rate ziehen! Belüftung. Persönliche Schutzausrüstung: Chemikalienschutzanzug mit umgebungsluftunabhängigem Atemschutzgerät.
R-Sätze Betriebsanweisung:
R12:Hochentzündlich.
R14:Reagiert heftig mit Wasser.
R23:Giftig beim Einatmen.
R34:Verursacht Verätzungen.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn möglich, dieses Etikett vorzeigen).
Beschreibung
Dichlorosilane is a highly flammable, corrosive,
and toxic gas at room temperature and atmospheric
pressure. It causes severe bums on
contact with eyes, skin, and mucous membranes.
With water or moisture, it hydrolyzes rapidly to
yield silica and silicon oxyhydride along with
hydrochloric acid. It is shipped as a liquefied gas
in low pressure cylinders at its vapor pressure of
9.1 psig (62.7 kPa) at 70°F (21.1℃. It can form
flammable mixtures with air and oxidizing
agents.
Chemische Eigenschaften
colourless gas
Verwenden
Dichlorosilane is primarily used in the electronics
industry for such applications as growth
of epitaxial or polycrystalline silicon and
chemical vapor deposition of silicon dioxide
and silicon nitride.
Allgemeine Beschreibung
Dichlorosilane is a flammable and poisonous gas, with a strong repulsive odor. Dichlorosilane is easily ignited in air, reacts with oxidizing agents, is very toxic by inhalation, and is a strong irritant to skin, eyes and mucous membranes. Under prolonged exposure to fire or intense heat the container may rupture violently or rocket.
Air & Water Reaktionen
Highly flammable. Based on the properties of similar materials, there is the possibility that the reaction of Dichlorosilane with water may be vigorous or violent. Products of the reaction include hydrogen chloride. The reaction generates heat and this heat may be sufficient to ignite the product. The chlorosilicon hydrides(ClxSiHy) are spontaneously flammable in air, NFPA 1991.
Reaktivität anzeigen
Chlorosilanes, such as Dichlorosilane, are compounds in which silicon is bonded to from one to four chlorine atoms with other bonds to hydrogen and/or alkyl groups. Chlorosilanes react with water, moist air, or steam to produce heat and toxic, corrosive fumes of hydrogen chloride. They may also produce flammable gaseous H2. They can serve as chlorination agents. Chlorosilanes react vigorously with both organic and inorganic acids and with bases to generate toxic or flammable gases.
Hazard
Dichlorosilane is toxic by inhalation and skin absorption. Hydrogen chloride causes severe eye and skin burns and is irritating to the skin, eyes, and respiratory system. The four-digit UN identification number is 2189. The NFPA 704 designation is health 4, flammability 4, and reactivity 2. The white area at the bottom of the diamond contains a W with a slash through it, indicating water reactivity.
Health Hazard
TOXIC; may be fatal if inhaled or absorbed through skin. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control may cause pollution.
Brandgefahr
Flammable; may be ignited by heat, sparks or flames. May form explosive mixtures with air. Vapors from liquefied gas are initially heavier than air and spread along ground. Vapors may travel to source of ignition and flash back. Some of these materials may react violently with water. Cylinders exposed to fire may vent and release toxic and flammable gas through pressure relief devices. Containers may explode when heated. Ruptured cylinders may rocket. Runoff may create fire or explosion hazard.
Materials Uses
Dichlorosilane, in the complete absence of water,
can be safely stored in mild steel equipment.
In the presence of even small traces of water,
dichlorosilane becomes extremely corrosive
since the Si-CI bonds react rapidly with water,
generating hydrogen chloride.br/>
Because of reactivity with water, dichlorosilane
should always be handled in dry equipment with a dry inert gas such as nitrogen.
For transfer service, dry inert gas is preferred to
pumping. Some examples of other common
compatible materials used include: Viton, Teflon,
Kel-F, nickel, Monel, and some types of
stainless steel.
Sicherheitsprofil
Moderately toxic by
inhalation. Ignites spontaneously in air.
Confined mixtures with air are
spontaneously explosive. When heated to
decomposition it emits toxic fumes of Cl-.
See also CHLOROSILANES.
Lager
Since dichlorosilane is a highly flammable, corrosive,
and toxic liquefied gas, appropriate precautions
must be taken in its storage and handling.
During the handling of chlorosilanes, the
use of such protective equipment as goggles,
neoprene or natural rubber gloves, and protective
clothing is essential. SCBAs, as well as
both safety showers and eyewash fountains,
should be available for emergency use.
Cylinders should be assigned a definite area
for storage. The area should be dry, cool, well
ventilated, fire resistant, and away from ignition
sources. Keep cylinders protected from excessive
temperature rise by storing them away from
radiators or other heat sources. Storage conditions
should comply with local and state regulations.
Cylinders may be stored in the open, but must
be protected against extremes of weather and
from the dampness of the ground to prevent
rusting. During the summer, cylinders stored in
the open should be shaded against the continuous
direct rays of the sun in those localities
where extreme temperatures prevail.
Waste disposal
Dichlorosilane should not be discharged directly
into surface waters or sewer systems since an
acidic waste product is formed. The disposal
can be accomplished by controlled introduction
of the product into water. The exothermic reactions
of dichlorosilane with water (hydrolysis)
result in the formation of hydrochloric acid and
an insoluble silicon containing solid or fluid. In
order to prevent air pollution, the quantity of
water must be sufticient to dissolve all of the
hydrogen chloride that will be formed. The ratio
of water to dichlorosilane should be at least 10
to 1. The corrosive and exothermic nature of the
reaction should be t;onsidered in selecting materials
of construction for the equipment used in
this procedure.
The hydrochloric acid formed should then be
neutralized with an alkali agent such as aqueous
ammonia, sodium hydroxide, lime slurry, etc.,
and should be added as an aqueous solution
with agitation to the acidic medium. Consideration must be given to the additional heat that
will be produced by the neutralization.
Silicon-containing solids should be washed to
remove residual acid. Discard any product, residue,
disposable container, or liner in an environmentally
acceptable manner. Disposal of
dichlorosilane by neutralizing, scrubbing, incineration,
or by other means, may be subject to
permitting by federal, state or provincial regulations.
Persons involved with disposal of dichiorosilane
should check with the environmental
authorities having jurisdiction to determine
the applicability of permitting regulations
to disposal activities.
Dichlorsilan Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
