Sulfide Scavenger Synthesis via Alkali Catalyst
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Solution Overview
Problem
Existing sulfide scavengers contain inert byproducts that increase storage and shipping costs, are flammable, and negatively affect downstream hydrocarbon applications due to their solubility, leading to corrosion and fouling of processing equipment.
Innovation Solution
Controlled reaction conditions, specifically using secondary amines and aldehydes in the presence of an alkali hydroxide catalyst at temperatures below 90°C, to produce sulfide scavengers with reduced inert content, enhancing scavenging activity and safety while reducing reaction times and storage volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional secondary amine-aldehyde adduct scavengers are used, then sulfide removal function is provided, but inert byproducts increase storage and shipping costs
Solution Approach 1:
The patent changes the reaction parameters by introducing an alkali metal hydroxide catalyst and controlling the molar ratio of aldehyde to amine between 0.5:1 and 2:1, with temperature controlled between 0°C and 100°C. These parameter changes optimize the reaction to minimize inert byproduct formation while maintaining effective sulfide scavenging activity.
Solution Approach 2:
The patent introduces alkali metal hydroxide as a catalyst intermediary to facilitate the reaction between secondary amines and aldehydes. This catalyst mediates the formation of the desired adduct while reducing the formation of inert N-methyl secondary amine byproducts, thereby improving the efficiency of the scavenger production.
2Reliability
If conventional scavengers are used, then sulfide removal is achieved, but flammability risk increases
Solution Approach 1:
By optimizing the reaction conditions including temperature control (0°C to 100°C), molar ratios (aldehyde:amine from 0.5:1 to 2:1), and introducing alkali metal hydroxide catalyst, the patent produces scavengers with reduced inert content. Since many inerts are flammable, reducing their concentration directly lowers the flammability risk while preserving the sulfide removal capability.
3Reliability
If conventional scavengers are used, then sulfide removal function is provided, but downstream hydrocarbon applications are negatively affected
Solution Approach 1:
The patent optimizes reaction parameters including using alkali metal hydroxide catalyst, controlling molar ratios between 0.5:1 and 2:1, and maintaining temperatures between 0°C and 100°C. These changes produce scavengers with minimized inert byproducts that are soluble in hydrocarbons, thereby preventing corrosion and fouling of downstream equipment while maintaining effective sulfide scavenging.
Solution Approach 2:
The alkali metal hydroxide catalyst acts as an intermediary that directs the reaction toward the desired adduct product while minimizing the formation of soluble inert byproducts. This catalytic mediation ensures that the resulting scavenger is effective for sulfide removal without introducing harmful substances that would cause corrosion or fouling in downstream hydrocarbon processing.
4Ease of manufacture
If conventional synthesis methods are used, then scavenger production is achieved, but reaction time and purification requirements increase
Solution Approach 1:
The patent changes the synthesis parameters by introducing alkali metal hydroxide catalyst and optimizing the molar ratio of aldehyde to amine (0.5:1 to 2:1) with temperature control (0°C to 100°C). These parameter changes accelerate the reaction rate and improve selectivity, reducing both reaction time and the need for extensive purification steps while maintaining high yield of active scavenger product.
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 method results in sulfide scavengers with increased scavenging activity, reduced reaction times, lower volume for easier storage and shipping, and improved safety, minimizing nitrogen content and corrosion risks in hydrocarbon applications.
Implementation Method 1
reacting at least one secondary amine with at least one aldehyde and solvent in the presence of a catalyst to form a reaction composition, wherein the reaction temperature is less than or equal to about 90 °C and wherein said catalyst comprises an alkali hydroxide
Data Source
AI summary
Methods for making sulfide scavenging compositions are provided. The method comprises reacting at least one secondary amine with at least one aldehyde and solvent in the presence of a catalyst to form a reaction composition, wherein a reaction temperature is less than or equal to 90 °C. Sulfide scavengers using the above method are also disclosed. Methods for removing sulfides from fluid streams are also provided. The methods include adding the above sulfide scavengers to fluid streams.