Revealing the role of sulfur

As sulfur holds the key to antioxidant behaviour in base oils, model studies help Nynas researchers realise how to improve the oxidation stability of the company’s lubricant base oils through the addition of sulfur-containing secondary antioxidants.

Thomas Norrby

Senior Specialist, Lubricants, Nynas, is also an Affiliate Professor in the Department of Machine Design at the Royal Institute of Technology (KTH) in Stockholm.

With extensive experience of the lubricants industry, he left Statoil Lubricants where he was R&D Manager to join Nynas in November 2014.

“Actually what we have shown now is the formulation of oxidation stability in model systems,” states Professor Thomas Norrby, Senior Lubricant Specialist at Nynas.

Studying the relationship between oxidation stability and the sulfur content of base oils, Thomas Norrby and his colleagues in Nynas Technical Development and Market Support team were able to demonstrate that the oxidation stability of the company’s NYBASE® oil range can be controlled through the addition of sulfur-rich base oil components and sulfur-containing secondary antioxidants.

Their work promises to serve as useful guidance for formulators wishing to optimize the antioxidant response in finished lubricant products.

The NYBASE oil range was introduced to replace Group I base oils, as these are becoming scarce due to ongoing changes in the refining industry. Blends of highly refined and hydrotreated naphthenic and Group II oils, the NYBASE oils have been engineered to have solvency and viscosity properties similar to Group I oils, but with a low aromatic content.

“The trouble is, when you get rid of the polycyclic aromatic hydrocarbons you also lose most sulfur compounds. As a result, the NYBASE oils have a lower sulfur content than Group I base oils, which is unfortunate as a high sulfur content in the base oil is known to promote antioxidant performance,” explains Thomas Norrby.

During the past few years of in-depth and systematic investigations of the key properties of the blended base oil range, the researchers did indeed find a lower response to primary antioxidants in NYBASE oils than in Group I oils.

“This made us take a closer look at the role of sulfur, and at the correlations between added primary and secondary antioxidants and overall base oil sulfur,” says Thomas Norrby.

“We found that the simplest way for an end-user to significantly improve the antioxidant response in our NYBASE oils is to add sulfur in the form of sulfur-containing secondary antioxidants. In fact, a comparative study showed that this method could result in a better performance than that of Group I oils,” he says.

Tuning oxidation stability

  • The researchers used High Pressure Differential Scanning Calorimetry (HP-DSC) to study the effect of the sulfur content in base oils. The Oxidation Induction Time (OIT) was determined at oxygen levels of 35 bar and 200°C.
  • By measuring the OIT in relation to added primary and secondary antioxidants and base oil sulfur levels, the team was able to chart the oxidation stability of NYBASE® oil with varying amounts of added sulfur from sulfur-containing secondary antioxidants.
  • They found a way of tuning the base oil and also established correlations that will help to guide the formulation of lubricants.

Further reading

Less can be more

Using naphthenic oil of high viscosity and novel nanoparticles, Nynas’ specialists make leaner high-performance lithium complex grease formulated with fewer components, potentially enabling lower manufacturing costs.

Naphthenic oil gives grease a competitive edge

With a viscosity of 150 cSt, the BT 150 from Nynas' Harburg refinery is an excellent choice for grease manufacturers. Offering an alternative to, for instance, the 750SUS oil used in the US grease market, this new naphthenic oil promises to save money and improve performance.

Great in grease

Recent studies show that the NYBASE™ range offers major benefits when used to replace paraffinic Group I oil in existing lube and grease formulations.

THERE IS MORE TO US THAN THIS

We are delighted you are interested in our products. If you have any questions about our products and services, get in touch with your local Nynas contact. Besides top quality oils, we offer a wide range of services, including rapid delivery worldwide, training, seminars and much more. All you have to do is ask.

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Sabine Langmuller

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

 Paul Bester

Paul Bester

Channel Manager CEETMEIA

 Sameen Kadli

Sameen Kadli

Customer Service Executive

 Sibala Libish Kumar

Sibala Libish Kumar

Customer Service Executive

 Abigail Waller

Abigail Waller

General Manager / Sales Manager

Farhana Mitha

Farhana Mitha

Sales Executive

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

Marco Roncelli

Marco Roncelli

Sales Executive

 Ilenia Bellotti

Ilenia Bellotti

Customer Service Executive

Daniele Frustagli

General Manager

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

 Jason Wong

Jason Wong

APAC Regional Director

 Rio Nasution

Rio Nasution

General Manager / Sales Manager

Lawrence Teo

Lawrence Teo

Area Sales Manager Malaysia, Sri Lanka and Bangladesh

 Georgina Ng

Georgina Ng

Customer Service Executive

 Dawn Tay

Dawn Tay

Customer Service Executive

 Ovidiu Nan

Ovidiu Nan

General Manager

Sabine Langmuller

Sabine Langmuller

Customer Service Coordinator

 Ovidiu Nan

Ovidiu Nan

General Manager

Sabine Langmuller

Sabine Langmuller

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

David Barnett

David Barnett

Sales Manager

 Melissa Hill

Melissa Hill

Sales Representative

 Samantha Moodley

Samantha Moodley

Customer Service Executive

Lee Anne Williams

Lee Anne Williams

Customer Service Coordinator

 Jason Wong

Jason Wong

APAC Regional Director

 Rio Nasution

Rio Nasution

General Manager / Sales Manager

Lawrence Teo

Lawrence Teo

Area Sales Manager Malaysia, Sri Lanka and Bangladesh

 Georgina Ng

Georgina Ng

Customer Service Executive

 Dawn Tay

Dawn Tay

Customer Service Executive

 Myriam Picado

Myriam Picado

General Manager / Sales Manager

 Juan Jiménez

Juan Jiménez

Sales Executive

 Jose Luis Maceda

Jose Luis Maceda

Customer Service Coordinator

 Gloria Villaverde Parrado

Gloria Villaverde Parrado

Customer Service Executive

Maria Jose Municio

Maria Jose Municio

Sales Executive

Maria Jose Municio

Maria Jose Municio

Sales Executive

 Jason Wong

Jason Wong

APAC Regional Director