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The following tables list typical processes which make use of MARLOTHERM type synthetic heat
transfer fluids. MARLOTHERM Heat Transfer Fluids capability for indirect cooling
and heating over a wide temperature range makes them suitable for many different applications.
The use of organic heat transfer fluids is primarily keyed to process
steps in the production of both chemical raw materials and high-quality finished
products. The heat transfer liquids are used to heat and to temper reactors of
the widest variety of construction types. They also provide heat to
distillation columns. But, heat transfer fluids can also be used for cooling
strongly exothermal processes, such as occur in the synthesis of ethylene oxide, aniline
or formaldehyde. They also can be used in waste heat recovery circuits for
increased energy efficiency.
Table 1: Typical areas of application for organic heat
transfer fluids
In processing plants in the chemicals and petrochemicals
industry
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| Alkylbenzene |
Aniline |
| Aromatic separation |
Caprolactam |
| Dimethyl terephthalate |
Ethylene oxide |
| Formaldehyde |
Isomerization process |
| Herbicides, insecticides |
Paraffin sulphonate |
| Pharmaceutical active ingredients |
Phthalic anhydride |
| Rubber and plastics additives |
Terephthalic acid |
| Upgrading of coal |
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Depending upon the quantity of heat to be handled, up to 400 m3
heat transfer fluid volume is frequently required and circulated in chemical processing.
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In polycondensation and polymerization processes
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| Mixed adducts |
Polyacrylates |
| Polyamides |
Polyesters |
| Polyethylene (LDPE) |
Polymethacrylates |
| Polyphenylene oxide |
Polypropylene (LDPP) |
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Polycondensations exhibit a more moderate reaction sequence and, depending on the plant
size, can be adequately supplied with heat transfer media quantities of as little as about
10 to 40 m3. However, they require extremely fine temperature adjustments since
even slight overheating results in discoloration and irreparable damage to the
polycondensate product.
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Table 2: Applications in plastics and rubber processing
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| Fiber manufacture |
Spinning nozzles, calenders
stretching rolls and stretching godets
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| PVC & polypropylene film manufacture |
Calenders, stretching godets
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| Aluminum foil coating |
Driers
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Hot melt adhesive & wood glue joint
processes
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Presses, driers |
| Manufacture and forming of finished
parts |
Mixers, paddle mixers, kneaders,
pre-roll mills, vulcanizing presses |
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High demands are placed on heat control in the fields of plastics and rubber processing,
too. This market comprises an abundant range of the widest variety of machines and
appliances with the relevant auxiliary units for energy supply.
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Table 3: Other applications |
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| Asphalt and coal tar |
Compounding, transport and storage
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| Flooring and roofing manufacture |
Compounding coating and forming
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| Food processing |
Fat and oil refining, transport and storage, baking, frying
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Industrial laundry
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Indirect high temperature heating
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| Lumber |
Drying, laminating
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| Metal processing |
Die casting, laminating
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| Oil and gas processing |
Temperature control, separations
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| Paper processing |
Production processes, laminating
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| Pharmaceuticals |
Multi-purpose batch reactors, low temperature reaction control, separations
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| Textile processsing |
Calendering, coating, drying
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Table 4: Chemical reactions
Supply of process heat and/or
removal of process heat (cooling) |
Condensation reactions
Cyclization processes
Polycondensation processes
Oxidative changes
Cleavage reactions
Hydrogenization
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Purification and separation
processes |
Distillation
Fractionation
Fractional crystallization
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Melting-on processes
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Wire coating |
| Preheating of reactants |
Preheating air in oxidation processes
Preheating products in thermal cleavage reactions
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| Energy recovery |
From waste gases in cleavage
and combustion processes and in waste gas purification |
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Recently, energy conservation has become an area
of active interest. This has led to an expansion in the fields of application of heat
transfer media with a higher load capacity.
Thus, the heat content from the waste gases from blast heating apparatus or those arising
in the afterburning of waste gas flows from tunnel driers for the removal of solvent
residues can be fed back into the process via a heat transfer medium circuit to preheat
the fuels and fuel air or to heat up the material to be dried. Energy-saving designs in
power plants, usually in the flue gas dust collection system, function in an analogous
fashion via recuperative heat displacement systems. In solar power stations the organic
heat transfer fluids gained access to a completely new technology at operating
temperatures of 300 to 350 °C.
In summary, it can be said that in all processes, the organic heat transfer fluids are used
in a broad array of applications. The volume of heat transfer medium
essentially depends on the specific heating or cooling requirements in the relevant
process and may range between a few liters to several hundred cubic meters.
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Product Applications