The Anodic Protection Acid Distributor is a specialized apparatus designed for controlled management of concentrated sulfuric acid (typically 96% and above) and oleum in heavy industrial settings. Primary applications include sulfuric acid alkylation operations within petroleum refining complexes and absorption/drying sections of sulfuric acid manufacturing facilities.

This equipment addresses two critical operational requirements: enabling consistent liquid dispersal throughout the process vessel while incorporating electrochemical surface stabilization to combat the highly corrosive nature of the acid medium.

The internal arrangement consists of a network of collection troughs, metered overflow edges, and distribution tubes. The unit accepts incoming acid flow and partitions it into multiple individual streams that spread evenly over underlying packing material. This distribution pattern prevents channeling effects, guarantees complete surface coverage, and facilitates optimal gas-liquid contact within the tower environment.

Standard metallic materials experience accelerated degradation when exposed to hot, concentrated sulfuric acid. The distributor addresses this limitation through the use of appropriate stainless steel alloys combined with a dedicated anodic protection system.

• Technical Approach: A power supply unit applies a regulated positive charge to the metal surface, maintaining its potential within a passive range. This condition promotes the establishment of a stable, adherent oxide layer that functions as a barrier between the base material and the corrosive acid.
• Practical Result: This methodology restricts material loss to minimal levels (often below 0.1 mm per year). The outcome is extended equipment durability and prevention of metallic contamination entering the process acid.

• Material Composition: Fabricated from austenitic stainless steel grades (including 304L and 316L) chosen for their suitable response to anodic polarization and resistance to acid exposure.
• Hydraulic Arrangement: Features precisely calculated weir heights and aperture sizing to maintain uniform flow distribution across varying process conditions.
• Installation Approach: Constructed in manageable sections that fit through standard vessel openings, allowing internal assembly without the need for field welding.
• Circuit Configuration: Incorporates purpose-positioned electrodes within the acid path to complete the electrical circuit without compromising flow characteristics.

• Service Life Extension: Lowers long-term maintenance expenditures through effective control of corrosion-related deterioration.
• Acid Quality Maintenance: Prevents the introduction of metal ions into the acid stream, preserving purity requirements for sensitive downstream applications.
• Process Performance: Ensures consistent wetting of tower internals, supporting efficient mass transfer and separation operations.
• Structural Reliability: Maintains mechanical integrity during continuous operation under elevated temperatures and aggressive chemical exposure.

• Alkylation Units Utilizing Sulfuric Acid as Catalyst
• Drying Towers and Absorption Columns in Acid Manufacturing
• Acid Cooling and Circulation Systems
• Critical Acid Storage and Transfer Installations

The Anodic Protection Acid Distributor combines fundamental mechanical design concepts with sophisticated electrochemical protection technology. Its ability to deliver uniform acid distribution while resisting chemical attack makes it a viable option for facilities requiring dependable long-term performance in concentrated sulfuric acid service.