Pretreated Sorbent Adsorption for Styrene Purification
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Solution Overview
Problem
The challenge lies in efficiently removing impurities, particularly colored and sulfur-containing impurities, from hydrocarbon streams containing styrene and other vinyl aromatic compounds, which affects the stability and quality of styrene-based products and leads to fouling of processing systems.
Innovation Solution
The method involves using pretreated sorbents, such as clays, to adsorb impurities from hydrocarbon streams by washing, adjusting pH, degassing, removing solvent, and drying, followed by contacting the hydrocarbon stream with the sorbents to form a purified stream, and separating the purified stream from the sorbents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional separation methods are used to recover styrene from hydrocarbon streams, then styrene can be obtained, but the quality of styrene is inferior and the cost is significant
Solution Approach 1:
The patent extracts impurities (colored materials and sulfur-containing compounds) from the hydrocarbon stream using selective sorbents, thereby obtaining high-quality styrene. The sorbents specifically target and remove harmful impurities while leaving the styrene in the purified stream, resolving the contradiction between quantity recovery and quality enhancement.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the sorbents through pretreatment steps (washing, pH adjustment, degassing, drying) to optimize their impurity removal capabilities. These parameter changes enable the sorbents to selectively adsorb impurities while maintaining styrene purity, achieving both efficient recovery and high quality.
2Quantity of substance
If impurities are present in the hydrocarbon stream, then styrene can be recovered, but the stability of styrene monomer is compromised and premature polymerization occurs
Solution Approach 1:
The patent removes impurities that cause premature polymerization and oligomerization through selective adsorption on sorbents. By extracting these harmful substances before styrene polymerization, the monomer stability is preserved while maintaining recovery efficiency.
Solution Approach 2:
The patent performs preliminary purification of the hydrocarbon stream by passing it through sorbent beds before the styrene polymerization process. This preliminary action removes impurities that would otherwise trigger premature polymerization, ensuring stable monomer composition throughout storage and processing.
3Quantity of substance
If impurities are present in the hydrocarbon stream, then styrene can be recovered, but fouling of processing systems occurs
Solution Approach 1:
The patent extracts and removes impurities including sulfur-containing compounds and colored materials that cause fouling in processing systems. By removing these substances upstream through sorbent adsorption, the reliability and operational stability of downstream processing equipment is maintained.
4Manufacturing precision
If sorbents are used to remove impurities, then colored and sulfur-containing impurities are removed, but the sorbents require extensive pretreatment
Solution Approach 1:
The patent performs necessary sorbent pretreatment actions (washing, pH adjustment, degassing, drying) before the sorbents are introduced to the hydrocarbon stream. This preliminary preparation ensures the sorbents are in the optimal state for impurity removal, achieving high efficiency while managing the complexity through systematic preparation steps.
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 removes a significant percentage of colored and sulfur-containing impurities, enhancing the stability and quality of styrene, preventing fouling, and meeting standard color specifications for styrene monomer.
Implementation Method 1
contacting the hydrocarbon stream with at least one sorbent that adsorbs at least a portion of the impurities from the hydrocarbon stream
Data Source
AI summary
In various embodiments, the present disclosure describes methods for removing impurities from a hydrocarbon stream containing at least one vinyl aromatic compound such as, for example, styrene. The methods include pretreating at least one sorbent to make the at least one sorbent operable for adsorbing the impurities, contacting the hydrocarbon stream with the at least one sorbent in order to adsorb at least a portion of the impurities and separating the hydrocarbon stream from the at least one sorbent. Impurities include, for example, colored impurities, sulfur-containing impurities and combinations thereof.