Diphenylmethane

  • Benzylbenzene
  • Benzene, 1,1'-methylenebis-
  • Ditane
Formula
(C6H5)2CH2
Structure
Description
Orthorhombic needles. Odor of oranges.
Uses
Org synthesis, dyes, perfumery.

Registry Numbers and Inventories.
CAS
101-81-5
EC (EINECS/ELINCS)
202-978-6
EC Class
dangerous for the environment
R 50/53
RTECS
DA4976500
RTECS class
Other
UN (DOT)
3295
Merck
13,3360
Beilstein/Gmelin
1904982
Beilstein Reference
4-05-00-01846
Swiss Giftliste 1
G-1587
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C13H12
Formula mass
168.24
Melting point, °C
22 - 25
Boiling point, °C
264
Vapor pressure, mmHg
0.001 (0 C)
Critical temperature
497
Critical pressure
28.20
Density
0.9985 g/cm3
Solubility in water
Insoluble
Viscosity
1.53 cp (60 C)
Surface tension
37.6 g/s2 (26 C)
Refractive index
1.57683 (20 C)
Partition coefficient, pKow
4.14
Heat of fusion
19.01 kJ/mol
Heat of vaporization
66.36 kJ/mol
Heat of combustion
-6928 kJ/mol

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Remove all sources of ignition. Provide ventilation.
Disposal code
1
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Oxidizing agents.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
130
Autoignition, °C
485
Upper exp. limit, %
8.66
Lower exp. limit, %
0.69
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Containers may explode when heated. Extinguishing media: Use agent most appropriate to extinguish fire. Cool containers with flooding quantities of water until well after fire is out. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Fire potential
Diphenyl and its derivatives are moderately flammable. Danger of fire is negligible @ ambient temperature but increase @ high temp, when material is dispersed in air.
Hazards
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
1
 
Flammability
1
 
 
Reactivity
0
 

Health.
Poison_Class
4
Exposure effects
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea. The toxicological properties of this substance have not been fully investigated.
   Inhalation
May cause respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.
   Skin
May cause skin irritation.
   Eyes
May cause eye irritation.

First aid
 
   Ingestion
Never give anything by mouth to an unconscious person. Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
3295
Response guide
Hazard class
3
Packing Group
I; II; III
 
HS Code
2902 90 80