Two-Stage Offgas Scrubbing for Organic Removal
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Solution Overview
Problem
The chemical industry faces challenges in efficiently removing organic constituents from gas streams, which are costly and require significant amounts of scrubbing medium, and the disposal of laden scrubbing media is technically complex.
Innovation Solution
A two-stage scrubbing process using a liquid alcoholic medium followed by an aqueous medium, where at least 0.7 kg of scrubbing medium is used per m3 of gas stream and at least 4 kg per kg of organic constituents, with the laden scrubbing media being recycled back into chemical processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional disposal methods are used for laden scrubbing media, then compliance with emission regulations is achieved, but disposal costs increase and technical complexity increases
Solution Approach 1:
The patent recovers and reuses the scrubbing media (alcoholic and aqueous phases) after the scrubbing process instead of disposing of them. The scrubbing media are separated, concentrated, and fed back into the chemical process, thereby eliminating the need for complex disposal systems while maintaining emission compliance.
Solution Approach 2:
The patent implements a feedback loop where the laden scrubbing media are separated, concentrated, and returned to the chemical process feedstock. This feedback mechanism allows continuous reuse of the scrubbing media, reducing both disposal complexity and operational costs while ensuring ongoing compliance with emission regulations.
2Reliability
If large amounts of scrubbing medium are used, then effective removal of organic constituents is achieved, but operational costs increase
Solution Approach 1:
The patent recovers both the alcoholic and aqueous scrubbing media after the scrubbing process and returns them to the chemical process. This recovery mechanism allows the scrubbing media to be reused multiple times, significantly reducing consumption and operational costs while maintaining effective removal of organic constituents.
Solution Approach 2:
The patent establishes a continuous cycle where the scrubbing media are separated, concentrated, and fed back into the chemical process continuously. This continuous reuse ensures that the scrubbing media remain effective for removing organic constituents without requiring constant replacement, thereby reducing both substance loss and operational costs.
3Loss of substance
If scrubbing media are worked up and reused, then scrubbing medium consumption is reduced, but technical complexity increases
Solution Approach 1:
The patent recovers the scrubbing media through a process that involves separation and concentration, followed by feeding back into the chemical process. This recovery approach reduces scrubbing medium consumption while the separation and concentration steps are integrated into the existing process flow, minimizing additional technical complexity.
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 process effectively removes over 99% of organic and alcoholic constituents from the gas stream, reducing disposal costs and technical complexity by recycling the scrubbing media into chemical processes.
Implementation Method 1
the gas stream is scrubbed in a first scrubbing unit with a liquid alcoholic scrubbing medium, causing the organic constituents in the gas stream being cleaned to pass over at least partially into the scrubbing medium
Implementation Method 2
the gas stream with a reduced content of organic constituents is scrubbed in a second scrubbing unit with an aqueous scrubbing medium, causing the alcoholic constituents to pass over at least partially into the scrubbing medium
Data Source
AI summary
The invention provides a process for removing organic constituents from a gas stream in a two-stage scrubbing operation, in which scrubbing is performed firstly with an alcoholic scrubbing medium and then with an aqueous scrubbing medium. The laden scrubbing media obtained can be used in certain (chemical) processes.