Dibenzyltoluene Light yellow transparent liquid CAS NO 26898-17-9

1. Description

Chemical name: DIBENZYLTOLUENE
Molecular formula: C21H20
Molecular weight: 272.38400
CAS No.:26898-17-9

2. Product Specification

3. Product Data

4. Characteristics

DIBENZYLTOLUENE is a high-performance synthetic,organic heat-transfer medium for use in the liquid phase in closed, forced circulation heat-transfer systems. It can be used below 370℃/698T(its max film temperature) in the liquid phase circulation system (330℃/626T is recommended as the max using temperature under normal pressure).

DIBENZYLTOLUENE is most suitable for indirect heating of reactors, polymerization vessels and distillation columns, of processing machines and driers, and heat ex-changers in process plants and systems for heat recovery. DIBENZYLTOLUENE is also suitable for cooling systems.

DIBENZYLTOLUENE circuits are advantageously operated using an inert gas back pressure of less than 100 mbar at the expansion vessel. Nitrogen has proven to be a suitable inert gas. Inert gas coverage can be used to protect against oxidation boiling at high temperatures and moisture absorption at low temperatures. Antioxidants are unstable at operating temperatures above 200°C/392T and are ineffective even after short operating times.

DIBENZYLTOLUENE is thermally stable up to very high operating temperatures. The DIBENZYLTOLUENE charge can be used for several years without significant changes. At very high temperatures, low- boiling and high-boiling decomposition products may be formed. Their degree of formation rises with increasing operating temperatures. The decomposition products remain completely dissolved in the DIBENZYLTOLUENE charge.

To check the operating condition of heat-transfer systems, quality controls should be carried out at appropriate intervals on representative samples from the mainstream of the circuit. Scope of testing and sampling must be individually matched to the charge volume and the operating temperature of the heat-transfer plant.

5. Material Compatibility

DIBENZYLTOLUENE does not corrode the usual metallic materials used in construction of plants and machinery. DIBENZYLTOLUENE is compatible with pure graphite, PTFE and fluorinated elastomers. These materials can be used as base materials for seals. In selecting the seals, note must be taken of the seal manufacturer's data for temperature resistance and mechanical strength.
Rubber-elastic binders swell on contact with DIBENZYLTOLUENE and should not be used in the seals for DIBENZYLTOLUENE plants.
Seals made of pure graphite have proven particularly useful in heat-transfer plants using DIBENZYLTOLUENE. To increase the strength and dimensional stability, these seals are advantageously provided with a metallic insert, e.g. a sheet metal core.

6. Toxicological properties and safety
DIBENZYLTOLUENE is intended for use as heat-transfer medium in a closed plant. For safety and environmental reasons, escape of the heat-transfer medium is to be prevented or limited to a minimum amount by means of appropriate construction measures. When handling DIBENZYLTOLUENE, the usual guidelines and recommendations for handling organic liquids should be observed and precautions should betaken.

7. Package
200kg/iron drum.

8. Storage
DIBENZYLTOLUENE should be stored in a dry, cool, ventilated place, away from direct sunlight and high temperature environment. The storage area should be away from fire sources and flammable materials.

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