Hyperbranched Polyesters as Crude Oil Wax Inhibitors
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Solution Overview
Problem
Crude oils with high wax content can solidify upon cooling, leading to flowability issues and wax deposition in pipelines and storage tanks, which existing additives struggle to effectively address.
Innovation Solution
The development of hydrophobically modified, hyperbranched polyesters through a 2-step process, involving the reaction of a polyol with a monomer containing a carboxylic acid group, followed by esterification with a mixture of linear and branched carboxylic acids, to create a pour-point depressant or wax inhibitor for crude oil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional additives are used to prevent wax precipitation, then some flowability improvement may be achieved, but they fail to effectively address high wax content crude oils that still solidify upon cooling
Solution Approach 1:
The invention changes the chemical parameters of the additive by using hyperbranched polyesters with specific functional groups (hydroxyl, carboxyl, amino) and controlled molecular weights (5,000-50,000 g/mol). These parameter changes enable the additive to effectively interact with high wax content crude oils, preventing paraffin crystallization and maintaining flowability where conventional additives fail.
Solution Approach 2:
The invention creates a composite system by combining hyperbranched polyester core structures with various functional end groups (hydroxyl, carboxyl, amino) and optionally incorporating solvents. This composite material design provides both the structural framework for wax interaction and the chemical functionality needed to prevent precipitation, achieving reliable performance in high wax content crude oils.
2Productivity
If the crude oil is kept warm to prevent solidification, then flowability is maintained, but energy consumption increases and cooling upon production still causes solidification
Solution Approach 1:
The additive is introduced into the crude oil before cooling occurs, performing preliminary action by pre-establishing protective interactions between the hyperbranched polyester and paraffin molecules. This preliminary action prevents crystallization during subsequent cooling, eliminating the need for continuous heating and reducing energy consumption while maintaining flowability.
Solution Approach 2:
The invention converts the harmful effect of paraffin crystallization into a beneficial outcome by using the same paraffin molecules that cause solidification as the target for protective interaction. The hyperbranched polyester additives bind to paraffin molecules, preventing them from forming disruptive crystal structures, thus turning the potential harm into a controlled interaction that maintains flowability without heating.
3Temperature
If paraffins crystallize in platelet form upon cooling, then the pour point is reached, but this forms a house-of-cards structure that blocks flow and requires extensive cleaning of pipelines and equipment
Solution Approach 1:
The hyperbranched polyester additives perform preliminary anti-action by preventing paraffin molecules from organizing into platelet-shaped crystal structures in the first place. The additives interact with paraffin molecules during cooling, blocking the nucleation and growth of harmful crystal lattices, thus preventing the formation of the house-of-cards structure that causes flow blockage and pipeline deposition.
Solution Approach 2:
The invention changes the physical parameters of paraffin crystallization by introducing hyperbranched polyester molecules that alter the crystal growth kinetics. This changes the pour point behavior and prevents the formation of large platelet crystals, instead promoting fine, non-agglomerating crystal structures that do not block flow or deposit on pipelines, eliminating the need for extensive cleaning.
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 hydrophobically modified, hyperbranched polyesters effectively lower the pour point of crude oils, preventing wax deposition and ensuring uninterrupted oil transport by modifying the crystallization behavior of waxes.
Implementation Method 1
esterifying the terminal hydroxy groups with a mixture of carboxylic acids comprising at least linear saturated aliphatic carboxylic acids and branched saturated aliphatic carboxylic acids
Implementation Method 2
modifying the crystallization behavior of waxes
Data Source
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AI summary
Hydrophobically modified, hyperbranched polyesters obtainable by a 2-step process of reacting a mixture comprising at least a polyol comprising at least 3 hydroxy groups and a monomer comprising one carboxylic acid group and at least two hydroxy groups, thereby obtaining a hyperbranched polyester comprising terminal hydroxy groups and at least partly esterifying the terminal hydroxy groups with a mixture of carboxylic acids comprising at least linear saturated aliphatic carboxylic acids groups and branched saturated aliphatic carboxylic acids groups. Formulations comprising hydrocarbons and such polyesters and to the use of such hydrophobically modified, hyperbranched polyesters or formulations thereof, as pour- point depressant or wax inhibitor for crude oil.