Ester Lubricant Additive Blend Reduces Compressor Friction

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Solution Overview

Problem

Compressors, particularly rotary screw drive compressors, face high energy consumption due to frictional losses, which is exacerbated by the need for continuous operation in industrial applications, leading to increased maintenance costs.

Innovation Solution

A lubricant composition comprising 90-99% carboxylic esters with a specific additive blend of dithiophosphates and alkylated phosphorothionates in low amounts (0.01-0.099% by weight) is used, enhancing energy efficiency by reducing frictional forces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If standard lubricants are used in rotary screw compressors, then basic lubrication is provided, but energy consumption is high due to frictional losses

Engineering Contradiction:

Improveenergy consumptionVSAvoidfrictional losses

Core Design Contradiction:

Use of energy by moving objectVSLoss of energy

Solution Approach 1:

The patent modifies the chemical composition parameters of the lubricant by using specific carboxylic esters with controlled chain lengths (n=6-8) and branching, combined with precisely dosed additives (dithiophosphates and alkylated phosphorothionates in 2:1 to 1:2 ratio at 0.01-0.099% total content). This parameter optimization reduces frictional losses and energy consumption by up to 20% compared to standard lubricants

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite lubricant formulation by combining carboxylic esters (90-99% by weight) with a specific blend of dithiophosphates and alkylated phosphorothionates. This composite material provides synergistic effects that reduce friction and improve energy efficiency beyond what single-component lubricants can achieve

Inventive Principle:

Principle #40Composite materials

2Productivity

If compressor operation is continuous to meet industrial demand, then productivity is maintained, but energy consumption and maintenance costs increase

Engineering Contradiction:

Improvecontinuous operation capacityVSAvoidenergy consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The lubricant composition enables continuous compressor operation by providing sustained lubrication and protection against wear and oxidation. The formulation maintains its effectiveness over extended periods, allowing uninterrupted operation while reducing the energy penalty associated with continuous running

Inventive Principle:

Principle #20Continuity of useful action

3Reliability

If additive amounts are increased to improve lubrication, then anti-wear performance improves, but friction reduction and energy efficiency may be compromised

Engineering Contradiction:

Improveanti-wear performanceVSAvoidenergy efficiency

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent identifies and applies an optimal additive concentration parameter range (0.01-0.099% by weight) where the synergistic interaction between dithiophosphates and alkylated phosphorothionates maximizes both anti-wear protection and friction reduction. This precise parameter control achieves reliable lubrication while maintaining energy efficiency

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The lubricant composition reduces energy consumption by up to 20% in rotary screw compressors compared to standard oils, while maintaining excellent air release properties and anti-wear performance, with specific improvements in energy efficiency and shear losses.

Implementation Method 1

Methodology Applied

Scientific EffectLubrication: Lubrication

Data Source

PatentEP2480643B1Lubricant compositions

Publication Date: 2019.03.20 COGNIS IP MANAGEMENT GMBH

AI summary

Machinery, such as compressors, hydraulic equipment or turbines, can be operated with increased energy efficiency, if it is running with a lubricating oil composition, containing an ester base oil together with an additive blend, the latter one in very low amounts, whereby the additive blend comprises at least different additives, selected from (a) dithiophosphates, and (b) alkylated phosphorothionates.