NHD Desulfurization and Decarbonization Technology

Product Overview

NHD Desulfurization and Decarbonization Technology, internationally known as Seleoxl technology, is a high-efficiency gas purification process that uses polyethylene glycol dimethyl ether as the absorption liquid. The process employs a physical absorption principle for CO₂ removal and regenerates the solvent using air or nitrogen—without consuming steam—making it energy-efficient and environmentally friendly.

This technology is included in the national key industry clean production technology catalog and is widely applied in petrochemical, coal chemical, and natural gas processing industries. It effectively removes hydrogen sulfide (H₂S) and sulfur dioxide (SO₂) from gas streams, ensuring production safety and high gas purity.

Working Principle

The NHD process relies on physical absorption, where the sulfur-containing gas is introduced into a polyethylene glycol dimethyl ether absorption solution. The solvent selectively captures H₂S and COS while allowing purified gas to exit at high purity.

• Solvent Regeneration: Achieved via air or nitrogen stripping, eliminating the need for steam and reducing energy consumption and operational costs.
• Safety & Compatibility: The solvent is low-volatility, non-corrosive, and environmentally benign, allowing the use of carbon steel equipment and simplifying system design.

Key Features

• High Purification Efficiency: Effectively removes H₂S and SO₂, ensuring gas quality and safety.
• Selective Absorption: Excellent specificity for sulfur compounds, adaptable to various gas compositions.
• Equipment Compatibility: Non-corrosive solvent allows the use of carbon steel, lowering investment costs.
• Low Solvent Loss: Low vapor pressure reduces solvent evaporation and improves operational efficiency.
• Foam-Free Operation: No foaming occurs, eliminating the need for defoaming agents and simplifying the process.
• Safe & Environmentally Friendly: Non-toxic, odorless solvent meets safety and environmental standards.
• Energy Efficient: Regeneration occurs without steam consumption, reducing overall energy use.

Applications

• Petrochemical Industry: Desulfurization and decarbonization of refinery and chemical process gases, improving product quality.
• Coal Chemical Industry: Purification of syngas in coal gasification and coal-to-chemical processes, removing sulfur and other harmful components.
• Natural Gas Processing: Removal of sulfur compounds from natural gas, ensuring safe use and compliance with environmental regulations.