Chemical Processing

Heat transfer fluid for chemical processing

Chemical engineers may require heat transfer for indirect heating of:

  • process liquids and polymers
  • single fluid batch processing
  • pipeline tracing
  • energy recovering
  • low pressure cogeneration
  • drying and heating of bulk materials
  • gas processing.

These chemical reactions often occur at high temperatures, which must be maintained for prolonged periods. To safely and efficiently complete chemical processing at these temperatures, manufacturers can use either steam or thermal fluid.

Historically, engineers preferred steam when indirectly heating products because it is a cost-efficient resource that is readily available.

However, steam systems require high operating pressure to achieve necessary temperatures, putting workers at risk. Corrosion in the pipework is a common issue with steam systems because of the combination of water vapour and hot air. Excessive corrosion can cause leaks in the pipework, leading to unnecessary, costly downtime.

In most applications, heat transfer fluids are a better alternative to water and steam because they are the safer option. Thermal fluids operate at lower pressures than steam, so engineers can use the system at higher temperatures for long periods of time.

There are a lot of heat transfer fluids on the market but not all of them are suitable for the chemical industry.

Manufacturers should select a heat transfer fluid based on its properties, such as thermal stability and heat transfer efficiency, but must also consider the requirements of the system and its associated cost.

As part of the Dangerous Substances and Explosive Atmospheres Regulations (DSEAR), employers must carry out regular assessments on the fire and explosion risks of any work activities involving dangerous substances, including thermal fluid and synthetics.

In order to comply with DSEAR and provide a safe working environment for all employees, manufacturers should ensure that risk is managed correctly and staff are trained on operating heat transfer systems.

HTFs have to meet a number of key criteria depending on the specifics of the application. These include high temperature thermal stability, product purity and heat transfer efficiency. The thermal stabilities and properties of mineral and synthetic HTFs differ, allowing them to meet this range of requirements.

Chemical engineers should consider purchasing synthetic thermal fluid for chemical processing because they have a lower propensity to form carbon than mineral based oils, offering better heat transfer efficiency and thermal stability. They are also more resistant to fouling, which means they tend to form less coke on the system’s internal pipework and heater.

Choosing the wrong heat transfer fluid can cause unplanned downtime. Fluid degradation can occur when a fluid is heated above its maximum bulk temperature. When heated above its temperature, molecules will form and cause thermal cracking that reduces the viscosity, flash point and ignition temperature of the fluid.

Once a fluid has degraded it will impact production or stop it all together. At this point, manufacturers must flush, clean and refill the heat transfer system with new fluid, which can be costly.

Choosing the right fluid and applying a proactive condition monitoring and maintenance programme such as Thermocare, will reduce the risk of unplanned downtime and slow the degradation process.

Globaltherm™ heat transfer fluids are used in chemical processing operations all over the world and the product range may be used for indirect heating of:

  • process liquids and polymers
  • single-fluid batch processing
  • pipeline tracing
  • energy recovery
  • low pressure cogeneration
  • drying and heating of bulk materials
  • gas processing.

All chemical processes have operating parameters specific to the application that guide the selection of the most suitable heat transfer fluid. The Globaltherm™ family of heat transfer fluids offers a broad range of heat transfer product with operating temperatures to suit all chemical processes.

 

This high temperature liquid phase thermal oil is one of the most popular fluids for chemical processing applications.

Globaltherm Syntec is a superior synthetic HTF that delivers outstanding performance and thermal stability at continuously high temperatures up to 345 degrees centigrade.

This synthetic heat transfer fluid is recommended for use in non-pressurised, indirectly heated, closed loop heat transfer systems operating at bulk temperatures up to 400°C.

Globaltherm™ Omnitech is a eutectic mixture of biphenyl and gives this heat transfer fluid flexibility to perform in both vapour and liquid phases.

This thermal fluid is designed for use in closed loop, forced circulation heat transfer systems and is recommended for use in a temperature range from 250 degrees centigrade to 350 degrees centigrade.

Marlotherm SH has a flash point of 200 degrees centigrade — one of the highest in its fluid class.

This high-performance synthetic, organic thermal oil is non-corrosive and can be used in non-pressurised heat transfer systems.

Globaltherm® S thermal fluid is thermally stable up to 300°C (572°F) and can be used for several years below this temperature with no adverse impact on performance.

This high-performance heat transfer fluid can be used in liquid phase heating and vapour phase heating in closed loop, forced circulation heat transfer systems.

Marlotherm LH has excellent thermal stability and is recommended for use in the temperature range from -30 degrees centigrade to 280 degrees centigrade.

This heat transfer fluid is recommended for use in a temperature range up to a maximum bulk temperature of 350 degrees centigrade with a high flash point at 194 degrees centigrade.

This superior, energy efficient heat transfer fluid is environmentally friendly, non-toxic and non-hazardous, so it requires no special handling. This thermal oil also has one of the industry’s highest flashpoint at 276 degrees Celsius.

Globaltherm® HF delivers superior resistance to sludging and extreme oxidation often found in chemical plants.

All heat transfer fluids will degrade over time. However, engineers may not be able to see the degradation in the system until it impacts production and chemicals will not blend.

At high operating temperatures, the bonds that exist between hydrocarbon chains will start to break and form shorter (commonly referred to as ‘light-ends’) and longer chained hydrocarbons (‘heavy-ends’).

The build-up of light-end components is a potential fire risk because they decrease the ignition temperature of the HTF. The accumulation of heavy-ends results in the formation of sticky carbon deposits or sludge and can be monitored by analysing the carbon residue in a system.

You can slow degradation by implementing a continuous preventative maintenance programme and frequently monitoring both the fluid and the system.

Manufacturers should complete regular visual checks of the system to check the condition of the pipework and make sure there are no leaks. Engineers should also frequently sample the fluid to determine its status.

To get a representative sample, manufacturers must take a hot, closed sample. This is the only way to understand the condition of the fluid when it is moving around the system.

Incorrect sampling may give inaccurate flash point results, which can have dangerous consequences. Unless the fluid samples are collected when the oil is hot and circulating, they may reveal artificially high flash point values. This incorrect sampling will lead to the incorrect conclusion that the fluid is safe and does not require attention.

After taking a correct sample, plant managers can interpret the data to understand the condition of the fluid and if any interventions are required to improve the condition of the fluid.

Most thermal fluid companies offer a seven-point test to determine the overall condition of the fluid but we offer more extensive analysis. Our eleven-point test looks at the sample in greater detail to ensure the results completely reflect reality.

We can help you create the right programme for your plant. We provide a condition based thermal fluid lifecycle maintenance programme, Thermocare, where our experts will work with you to improve accuracy when monitoring fluid, provide appropriate interventions when needed and organise maintenance schedules and train staff at the facility.

Where can I get more advice?

Global Heat Transfer has over 25 years of expertise in heat transfer fluids to help you choose the right one for your application.

Call us on +44 (0)1785 760555 for more information

Application

The most popular high temperature, heat transfer fluid. Suitable for operation up to 345°C (653°F) and can pumped to -3°C (27°F) and delivers exceptional performance. Primary applications are chemical industries, plastics processing and biodiesel.

About Globaltherm® Syntec

  • Globaltherm® Syntec uses the hydrogenated terphenyls chemistry of the most popular high temperature liquid phase heat transfer fluid. No other heat transfer fluid delivers a higher degree of customer satisfaction.
  • Globaltherm® Syntec HTF is used in a wide variety of applications in systems all over the world and delivers ultimate performance to ensure your system is running at maximum capacity and optimum efficiency.

Find out more about the properties of Globaltherm Syntec

Contact us for more information on high temperature thermal oils

We provide advice on how to choose the most appropriate oil for your heat transfer applications and provide our customers with continued technical support.

Call us on +44 (0)1785 760555 for more information

Application

Globaltherm® Omnitech is a high performance synthetic heat transfer fluid designed to meet the demands of liquid or vapour phase systems and indirect heat transfer. The no.1 choice for concentrated solar power and thermal electricity applications, PET and plastics production and chemical industries.

About Globaltherm® Omnitech

Globaltherm® Omnitech is a synthetic heat transfer fluidwhich combines low viscosity and exceptional thermal stability for consistent performance.

  • Globaltherm® Omnitech is a diphenyl ether-biphenyl HTF mixture
  • The eutectic mixture of diphenyl oxide and biphenylgives this heat transfer fluid flexibility to perform in both vapour and liquid phases. It is miscible and interchangeable (for top-up or dilution purposes) with other similar mix thermal fluids.
  • Globaltherm Omnitech HTF has low viscosity (2.5 cst at 40°C [104°F])
  • This thermal fluid is excellent for use in heat transfer fluid systems which require very precise temperature control due its ability to operate as a vapour phase fluid
  • This heat transfer fluid is highly dependable
ProductOperating Temperature1000 Litre IBC208 Litre barrelBulk
Globaltherm® Omnitech (15°C – 400°C)15°C to 400°C

Contact us for more information on high temperature thermal oils

We provide advice on how to choose the most appropriate oil for your heat transfer applications and provide our customers with continued technical support.

Call us on +44 (0)1785 760555 for more information

Application

Marlotherm® SH is a high performance dibenzyltoluene heat transfer fluid for use in closed loop, forced circulation heat transfer systems. Primary uses are chemical industries and plastics processing.

About Marlotherm® SH

Marlotherm® SH is recommended for use in the temperature range from 250°C (482°F) to 350°C (662°F), but can be used intermittently at film temperatures as high as 380°C (716°F).

  • Marlotherm® SH heat transfer fluid is non-corrosive
  • Marlotherm®  SH HTF can be used without being pressurised
  • This dibenzyltoluene heat transfer fluid can be used in systems requiring start-up temperatures as low as -5°C (23°F) without the need for heat tracing
  • Marlotherm® SH thermal fluid is thermally stable up to 300°C (572°F) and can be used for several years below this temperature without reducing performance
  • Low viscosity 17 cSt @ 40°C (104°F) with a pumping limit at -5°C (23°F) – making it the lowest in its fluid class
  • This thermal fluid has a high flash point 200°C – one of the highest in its fluid class
  • Marlotherm®  SH HTF has superior thermal stress resistance in the bulk outlet temperature range  from 60°C-350°C (140°F - 662°F)

Contact us for more information on high temperature thermal oils

We provide advice on how to choose the most appropriate oil for your heat transfer applications and provide our customers with continued technical support.

Call us on +44 (0)1785 760555 for more information

Application

Globaltherm® S is a high performance heat transfer fluid for use in closed loop, non-pressurised heat transfer systems. Primary uses are chemical industries and plastic processing applications.

About Globaltherm® S

Globaltherm® S is recommended for use in an upper temperature range from 250°C (482°F) to 350°C (662°F), but can be used intermittently at film temperatures as high as 380°C (716° F).

  • Globaltherm® S heat transfer fluid is non-corrosive and can be used in non-pressurised heat transfer systems
  • This heat transfer fluid can be used in systems requiring start-up temperatures as low as -5°C (23°F) without the need for heat tracing
  • Globaltherm® S thermal fluid is thermally stable up to 300°C (572°F) and can be used for several years below this temperature with no adverse impact on performance
  • Low viscosity 17cSt @ 40°C (104°F) with a pumping limit at -5°C (23°F)
  • This thermal fluid has a high ASTM D93 flash point at 200°C – the highest in class
  • Globaltherm® S has high thermal stress resistance in the bulk temperature range  from 60°C-350°C (140°F - 662°F)
  • Globaltherm® S has a highly aromatic structure with a boiling point range of 385°C -395°C (725°F -743°F) - the highest in class
ProductOperating Temperature1000 Litre IBC208 Litre barrelBulk
Globaltherm® S (-5°C – 350°C)-5°C to 350°C

Contact us for more information on high temperature thermal oils

We provide advice on how to choose the most appropriate oil for your heat transfer applications and provide our customers with continued technical support.

Call us on +44 (0)1785 760555 for more information

Application

Marlotherm® LH is a high performance benzyltoluene heat transfer fluid for use in closed loop, forced circulation heat transfer systems and can be used in liquid and vapour form. Used predominantly in Pharmaceutical industries and Plastic processing.

About Marlotherm® LH

Marlotherm® LH benzyltoluene HTF is recommended for use in the temperature range from -30°C (-22°F) to 280°C (536° F), but can be used intermittently at film temperatures as high as 380°C (716° F). It can also be used in pressurised systems up to 360°C (680°F).

  • Marlotherm® LH heat transfer fluid is non-corrosive
  • Marlotherm® LH can be used in the liquid or liquid/vapour phase due to its narrow boiling range of around 4°C (39°F)
  • This heat transfer fluid has low pour point and pumping 
limit -30°C (-22°F)
  • Marlotherm® LH HTF thermal fluid is thermally stable up to 300°C (572°F) and can be used for several years below this temperature without reducing performance
  • A thermal fluid with low viscosity for excellent heat transfer efficiency
  • Benzyl aromatic with excellent thermal stability
  • Marlotherm® LH HTF has a high auto-ignition temperature of 450°C (842°F)

Contact us for more information on high temperature thermal oils

We provide advice on how to choose the most appropriate oil for your heat transfer applications and provide our customers with continued technical support.

Call us on +44 (0)1785 760555 for more information

Application

Globaltherm® RP Heat transfer fluid is a heat transfer agent suitable for applications requiring single fluid heating and cooling including; oil and gas, heat recovery, plastics, polymers and styrene and chemical processing.

About Globaltherm® RP

  • Globaltherm® RP Heat transfer fluid is recommended for use in a temperature range up to a maximum bulk temperature of 660°F (350°C) and a maximum film temperature of 710°F (375°C).
  • Globaltherm® RP is a diaryl alkyl composition intended for use in applications that require liquid phase heat transfer.
  • Globaltherm® RP fluid can be used in non-pressurised systems, and is pumpable to 0°C (32°F).
  • Globaltherm® RP can be used in non-pressurized, liquid phase systems and has good low temperature properties, reducing the need for heat tracing.
  • Globaltherm® RP has a high flash point at 194°C (381°F) and delivers excellent thermal stability at the maximum use temperature.
  • Globaltherm® RP degrades primarily to low molecular weight products, therefore negating build-up of high molecular weight products that must be removed from the system.
  • Globaltherm® RP has a toxicity that is considered to be extremely low.
ProductOperating Temperature1000 Litre IBC200kg barrelBulk
Globaltherm® RP (-20°C – 350°C)-20°C to 350°C

Globaltherm RP properties

Contact us for more information on high temperature thermal oils

We provide advice on how to choose the most appropriate oil for your heat transfer applications and provide our customers with continued technical support.

Call us on +44 (0)1785 760555 for more information

Application

Globaltherm® HF Heat transfer fluid is a heat transfer agent suitable for applications requiring single fluid heating and cooling including; plastics processing, moulding, casting, asphalt, paint and chemicals.

About Globaltherm® HF

  • Globaltherm® HF heat transfer fluid’s flash point is one of the industry’s highest at 530°F (276˚C).
  • Not only does this heat transfer fluid have one of the highest flash points available it also contains a resilient blend of additives to ensure trouble-free service when managed correctly.
  • Globaltherm® HF heat transfer fluid delivers superior resistance to extreme oxidation and sludging found in many manufacturing environments, including plastics processing, molding, casting, asphalt, paint and chemicals.
  • This heat transfer fluid is environmentally friendly, non-toxic and non-hazardous and requires no special handling.
  • A superior high performance, energy efficient heat transfer fluid suitable for use in a variety of industrial processes.
ProductOperating Temperature1000 Litre IBC208 Litre barrelBulk
Globaltherm® HF (5°C – 338°C)5°C to 338°C

Properties of Globaltherm® HF

Contact us for more information on high temperature thermal oils

We provide advice on how to choose the most appropriate oil for your heat transfer applications and provide our customers with continued technical support.

Call us on +44 (0)1785 760555 for more information