Ammonia Purification Adsorbent Bed for Hydrocarbon Removal
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Solution Overview
Problem
Conventional two-column sour water stripping processes for ammonia purification often result in anhydrous liquid ammonia that does not meet Haber quality standards, necessitating costly blending with Haber quality ammonia to achieve market-grade product.
Innovation Solution
Incorporating an adsorbent bed using materials like silica and molecular sieves into the ammonia purification and liquefaction stage to enhance the removal of hydrocarbons from ammonia streams, allowing for the production of ammonia that meets Haber quality standards without additional blending costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional two-column sour water stripping process is used, then ammonia can be recovered from sour water, but the anhydrous liquid ammonia does not meet Haber quality standards due to hydrocarbon contamination
Solution Approach 1:
The patent employs an adsorbent bed containing porous materials such as silica gel, molecular sieves, or activated alumina to remove hydrocarbon contaminants from the ammonia vapor stream. These porous materials provide large surface area for adsorption, enabling effective removal of trace hydrocarbons to achieve Haber quality standards (less than 1 ppm hydrocarbon content).
Solution Approach 2:
The invention extracts the hydrocarbon contamination removal function from the conventional two-column stripping process by adding a separate adsorbent bed unit. This dedicated extraction step isolates and removes the harmful hydrocarbon components that the conventional process fails to eliminate, thereby producing high-purity Haber quality ammonia.
2Ease of manufacture
If conventional stripping process is used, then ammonia recovery is achieved, but costly blending with Haber quality ammonia is required to meet market standards
Solution Approach 1:
The adsorbent bed enables the ammonia purification process to be self-sufficient by internally removing hydrocarbon contaminants to achieve Haber quality standards. This eliminates the need for external blending operations with expensive Haber quality ammonia, allowing the process to produce market-grade product independently and reduce overall manufacturing costs.
3Object-generated harmful factors
If water wash and caustic wash are used to remove H2S and contaminants, then ammonia vapor is purified, but hydrocarbon removal remains insufficient
Solution Approach 1:
The adsorbent bed acts as an intermediary step between the caustic wash and the ammonia liquefaction process. While water wash and caustic wash effectively remove acid gases (H2S, CO2), the adsorbent bed serves as a intermediate purification stage that specifically targets and removes hydrocarbon contaminants that the wash processes cannot eliminate, thereby achieving comprehensive purification.
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 use of adsorbent beds improves the quality of anhydrous liquid ammonia to Haber quality, enabling it to be sold at the same price as Haber quality ammonia, thus addressing the long-standing issue of producing cost-effective, market-grade ammonia.
Implementation Method 1
each adsorbent bed including an adsorbent selected from the group consisting of silica and molecular sieves
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
Systems and methods for ammonia purification in the NH3 purification and liquefaction stage of a conventional two-column sour water stripping system using an adsorbent bed.