Low Color Glycol Production via pH Control
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Solution Overview
Problem
Current methods for producing high-purity glycols, such as ethylene glycols, often require additional steps like filtration and distillation, which are time-consuming and costly, and may not effectively remove color-producing contaminants that absorb light in the visible spectrum, posing challenges in achieving low color glycols for commercial applications.
Innovation Solution
Altering conditions within the reaction component or process stream, such as temperature, pressure, pH, and the concentration of color-producing contaminant precursors, to discourage the formation of color-producing contaminant intermediates, thereby reducing or eliminating their presence in the final product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If filtration systems (charcoal and/or ion exchange resins) are used to improve chemical purity, then the purity of the chemical is improved, but time and expense are added to the manufacturing process
Solution Approach 1:
The patent applies preliminary action by adjusting pH and controlling reaction conditions during the hydrolysis reaction itself to prevent color contaminant formation at the source, rather than removing them later through filtration. This preventive approach eliminates the need for subsequent filtration steps while maintaining high purity standards.
Solution Approach 2:
The patent employs parameter changes by systematically adjusting pH levels and temperature conditions during the hydrolysis reaction to optimize the balance between reaction efficiency and color contaminant prevention. By changing these parameters within specific ranges, the process achieves high purity glycol without requiring additional filtration equipment or time.
2Manufacturing precision
If distillation is used to separate fractions for high purity applications, then the purity of the chemical is improved, but time and expense are added to the manufacturing process
Solution Approach 1:
The patent prevents color contaminant formation during the hydrolysis reaction by controlling pH and temperature parameters, eliminating the need for subsequent distillation steps. This preliminary prevention approach produces high purity glycol directly from the reaction, saving significant time and equipment costs.
Solution Approach 2:
By optimizing pH and temperature parameters during hydrolysis, the patent achieves selective reaction conditions that produce high purity glycol without forming color contaminants. This parameter control eliminates the requirement for energy-intensive distillation processes while maintaining product quality.
3Manufacturing precision
If acid addition is used to control pH and reduce UV absorbing contaminants, then the concentration of UV absorbing contaminants is reduced, but additional cost is incurred and damage can occur to processing equipment
Solution Approach 1:
The patent prevents color contaminant formation by controlling pH within optimal ranges (7-10) during the hydrolysis reaction, rather than using aggressive acid addition later in the process. This preliminary control prevents contaminant formation while avoiding equipment corrosion associated with strong acids.
Solution Approach 2:
The patent changes the pH parameter to remain within a moderate range (7-10) throughout the hydrolysis process, preventing both UV-absorbing and visible color contaminants. This moderate pH control achieves contaminant reduction without the equipment damage risks of strong acid addition.
4Manufacturing precision
If pH is measured and adjusted late in the manufacturing process, then the pH can be controlled, but by-products may have already been formed rendering adjustments superfluous
Solution Approach 1:
The patent implements preliminary pH control at the beginning of the hydrolysis reaction, establishing optimal pH conditions before significant by-product formation occurs. This early control ensures that color contaminants are prevented from forming in the first place, making subsequent pH adjustments unnecessary.
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
This approach effectively produces glycols with low color averages, reducing the formation of color-producing contaminants and improving purity without the need for additional equipment or steps, ensuring compliance with commercial color requirements.
Implementation Method 1
the hydrolysis of ethylene oxide to ethylene glycol
Implementation Method 2
aldol condensation of acetaldehyde to form polyunsaturates
Data Source
AI summary
The present invention provides a process for producing low color glycols that comprises altering at least one condition of a reaction component and/or process stream within the process to be unfavorable for the formation of at least one color-producing contaminant intermediate. As such, such intermediates may be reduced in concentration, or even eliminated entirely, from glycols produced by the process. Since they are not present, or are present in reduced number, the intermediates cannot form color-producing contaminants in the glycols, and low color glycols are provided to the customer. Any condition that can discourage the formation of color forming contaminant intermediates can be adjusted, although conditions that can be adjusted by materials or equipment already utilized in the process, e.g., temperature, pressure, pH, concentration of a color-forming contaminant precursor, the presence of one or more solvents or catalysts favorable for the production of the color-producing contaminant or contaminant intermediate, and the like, are preferred.