Overbased Alkaline Earth Metal Alkylhydroxybenzoates Sediment Reduction
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Solution Overview
Problem
Existing processes for producing detergent-dispersant additives for lubricating oils result in high crude sediment, leading to decreased product yield and increased disposal costs, particularly for middle to high TBN products.
Innovation Solution
A process involving the reaction of alkylphenol with an alkali metal base, followed by carboxylation, acidification, neutralization with an alkaline earth metal base, and overbasing in the presence of a solvent and a small quantity of C1-C4 carboxylic acid to produce overbased alkaline earth metal alkylhydroxybenzoates with significantly reduced crude sediment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional processes are used to produce overbased detergent-dispersant additives, then middle to high TBN properties are achieved, but crude sediment content becomes high
Solution Approach 1:
The patent applies parameter changes by modifying the overbasing conditions, specifically using a controlled molar ratio of alkaline earth metal base to acidic overbasing material (0.5:1 to 2:1), maintaining reaction temperature between 20-80°C, and controlling reaction time (1-24 hours). These parameter optimizations resolve the contradiction by achieving high TBN (25-400 mg KOH/g) while minimizing crude sediment formation through precise control of chemical reaction conditions
2Reliability
If conventional processes are used to produce overbased detergent-dispersant additives, then detergent-dispersant properties are achieved, but product yield decreases due to high sediment
Solution Approach 1:
The patent optimizes product yield by controlling the molar ratio of alkaline earth metal base to acidic overbasing material between 0.5:1 and 2:1, which prevents excessive sediment formation. Additionally, the reaction is conducted at controlled temperatures (20-80°C) for optimized durations (1-24 hours), ensuring high detergent-dispersant properties while maximizing productive yield by minimizing waste sediment
Solution Approach 2:
The patent uses solvents as intermediaries to facilitate the overbasing reaction and improve product separation. The solvent system enables efficient reaction between the alkaline earth metal base and acidic overbasing material while facilitating easy separation of the final product from minimal sediment, thereby improving both product quality and yield
3Reliability
If conventional processes are used to produce overbased detergent-dispersant additives, then lubricating properties are achieved, but disposal costs increase due to high sediment
Solution Approach 1:
The patent minimizes disposal costs by optimizing the overbasing reaction parameters, specifically controlling the molar ratio of alkaline earth metal base to acidic overbasing material (0.5:1 to 2:1) and maintaining reaction temperature (20-80°C) and time (1-24 hours) within optimal ranges. This produces overbased detergent-dispersant additives with high lubricating properties and minimal crude sediment, significantly reducing waste treatment and disposal expenses
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 effectively minimizes crude sediment, improving product yield and reducing production costs while maintaining effective lubrication properties, particularly at low temperatures, for land and marine engines.
Implementation Method 1
Reacting alkylphenol with an alkali metal base to produce an alkali metal alkylphenate
Implementation Method 2
Carboxylating the alkali metal alkylphenate obtained in step a) with carbon dioxide so that at least 50 mole % of the starting alkylphenol has been converted to an alkali metal alkylhydroxybenzoate
Implementation Method 3
Acidifying the alkali metal alkylhydroxybenzoate obtained in step b) with an aqueous solution of a strong acid to produce an alkylhydroxybenzoic acid
Implementation Method 4
Neutralizing the mixture of alkylhydroxybenzoic acid and the at least one carboxylic acid from step d) with an alkaline earth metal base
Implementation Method 5
Overbasing the alkaline earth metal alkylhydroxybenzoate from step e) with a molar excess of alkaline earth metal base and at least one acidic overbasing material
Data Source
AI summary
A process for preparing an overbased alkaline earth metal alkylhydroxybenzoate, said process comprising overbasing an alkaline earth metal alkylhydroxybenzoate or a mixture of alkaline earth metal alkylhydroxybenzoate and up to 50 mole % of alkylphenol, based on the total mixture of alkylhydroxybenzoate and alkylphenol, with a molar excess of alkaline earth metal base and at least one acidic overbasing material in the presence of at least one carboxylic acid having from one to four carbon atoms and a solvent selected from the group consisting of aromatic hydrocarbons, aliphatic hydrocarbons, monoalcohols, and mixtures thereof.