Alkyl Phenate Lubricant Additives with 500:1 Sulfurization Ratios
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Solution Overview
Problem
Current methods struggle to minimize unsulfurized alkyl phenate/phenol variants in lubricating oil additives, particularly when they are overbased, leading to reduced effectiveness and increased regeneration during manufacturing processing.
Innovation Solution
A process involving sulfurizing alkyl phenol with a sulfur source, neutralizing, and optionally overbasing, followed by low-temperature post-processing to achieve a high sulfurization ratio of sulfurized alkyl phenate to unsulfurized alkyl phenate, minimizing unsulfurized variants to less than 0.2 weight percent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current methods are used to prepare overbased sulfurized alkyl phenates, then the manufacturing process is simpler, but the sulfurization ratio is low and unsulfurized variants are regenerated during processing
Solution Approach 1:
The patent applies preliminary action by conducting sulfurization before neutralization and overbasing steps. Specifically, alkyl phenol is sulfurized with sulfur monochloride to form sulfurized alkyl phenol, which is then neutralized with metal hydroxide and overbased with carbon dioxide. This sequence prevents unsulfurized variants from being regenerated during subsequent processing steps, achieving sulfurization ratios of 100:1 or greater while managing process complexity through controlled reaction conditions.
2Productivity
If temperature is increased during processing, then reaction speed increases, but unsulfurized alkyl phenate regenerates and sulfurization ratio decreases
Solution Approach 1:
The patent applies parameter changes by optimizing reaction temperatures to maintain sulfurization ratios. The sulfurization step is conducted at 0-25°C, neutralization at 25-60°C, and overbasing at 40-80°C. These controlled temperature parameters prevent the regeneration of unsulfurized alkyl phenate while maintaining adequate reaction speeds, achieving sulfurization ratios of 100:1 or greater without requiring excessive heating.
3Reliability
If sulfurization ratio is increased to 500:1 or greater, then additive effectiveness is enhanced, but processing temperature must be strictly controlled below 140°C
Solution Approach 1:
The patent achieves high sulfurization ratios (500:1 or greater) by performing sulfurization as the first step before neutralization and overbasing. The sulfurized alkyl phenol is then neutralized with metal hydroxide and overbased with carbon dioxide, all at controlled temperatures below 140°C. This preliminary sulfurization action ensures that the high sulfurization ratio is established before subsequent processing could potentially reduce it, thereby enhancing additive effectiveness while maintaining temperature control.
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 process achieves a sulfurization ratio of 500:1 or greater, maintaining high sulfurization levels while reducing unsulfurized alkyl phenate/phenol content to minimal levels, enhancing the effectiveness of lubricating oil additives.
Implementation Method 1
sulfurizing an alkyl phenol with a source of sulfur to provide a sulfurized alkyl phenol
Implementation Method 2
neutralizing and optionally overbasing the sulfurized alkyl phenol in the presence of a solvent to provide a sulfurized alkyl phenate composition
Implementation Method 3
The reaction mixture is allowed to stand for about 30 minutes to about 4 hours, with the mixture being stirred occasionally, and then the layers are separated
Data Source
AI summary
The present disclosure provides a method for preparing a sulfurized alkyl phenate product to achieve a high sulfurization ratio of sulfurized alkyl phenate to unsulfurized alkyl phenate/phenol in the context of a neutralized and optionally overbased additive.