Comprehensive Study on CHEMICAL LOGISTICS Industry

In chemistry, a chemical transport reaction describes a process for the purification and crystallization of non-volatile solids. The process is also responsible for certain aspects of mineral growth from volcanic wastewater. The technique differs from chemical vapor deposition, which usually involves the decomposition of molecular precursors (e.g. SiH4 → Si + 2H2) and yields conformal coatings. The technique popularized by Harald Schäfer involves the reversible conversion of non-volatile elements and chemical compounds into volatile derivatives.

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Some of the key players of CHEMICAL LOGISTICS Industry:

Agility, BDP International, DB Schenker, Deutsche Post DHL Group, C.H. Robinson, Montreal Chemical Logistics, CT Logistics

The volatile derivative travels through a sealed reactor, typically a sealed and evacuated glass tube that is heated in a tube furnace. Since the tube is under a temperature gradient, the volatile derivative will return to the starting solid and the vehicle will be released at the end opposite which it was created (see next section). The means of transport is therefore catalytic. The technique requires that the two ends of the tube (containing the sample to be crystallized) be kept at different temperatures. So-called two-zone tube furnaces are used for this purpose. The process is derived from the Van Arkel de Boer process, which was used to purify titanium and vanadium and uses iodine as a vehicle.

Transport reactions are classified according to the thermodynamics of the reaction between the solid and the means of transport. If the reaction is exothermic, the solid of interest is transported from the cooler end (which can be quite hot) of the reactor to a hot end where the equilibrium constant is less favorable and the crystals grow.