Tall Oil Fatty Acid (TOFA) Handling Design, Loading, and Installation.
White Liquor is a highly alkaline solution used in the Kraft pulping process to break down lignin and separate cellulose fibers from wood chips. Composed primarily of sodium hydroxide (NaOH) and sodium sulfide (Na₂S), White Liquor is highly corrosive and requires strict handling protocols to prevent chemical burns, environmental hazards, and exposure to toxic gases.
SafeRack provides customized loading and unloading solutions for railcars and tank trucks, incorporating closed-loop loading arms, spill containment systems, and OSHA-compliant fall protection to minimize risks and enhance efficiency. Key Safety Considerations:
- Fall Protection – Operators require gangways and safety cages for secure top-loading operations.
- PPE Compliance – Chemical-resistant gloves, protective eyewear, and full-body protection are essential.
- Corrosion-Resistant Equipment – White Liquor is highly caustic, requiring stainless steel or lined containment systems.
- Toxic Gas Exposure – White Liquor can release hydrogen sulfide and other sulfur gases, requiring proper ventilation.
White Liquor
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White Liquor
White Liquor Handling & Loading Design
Chemical Properties & Safety
- Appearance: White, opaque liquid with a strong chemical odor.
- Composition: Sodium hydroxide, sodium sulfide, and small amounts of sodium carbonate, sodium sulfate, and non-process elements.
- Uses: Pulp production in the Kraft process—breaks lignin bonds to separate cellulose fibers.
- Hazards: Highly corrosive, can cause severe burns, respiratory irritation, and toxic gas emissions when exposed to acids or heat.
Loading & Unloading Procedures
Railcar Loading & Unloading
- White Liquor is typically loaded using closed-loop systems with stainless steel loading arms and vapor return hoses to minimize exposure.
- Railcars used: 26,000-gallon DOT-111 insulated tank cars designed to handle caustic solutions.
- Typical railcar dimensions: ~9’ outside diameter, 45’-50’ overall length, 6’x6’ center or offset crash box openings.
Required Equipment:
- Fall Protection Systems – GX Gangways with safety cages for operator safety.
- Spill Containment Solutions – Track pans and berms prevent leaks and spills.
- Ventilation & Gas Detection – Toxic gas monitors to detect hydrogen sulfide exposure.
Tank Truck Loading & Unloading
- Approved DOT trailers: MC 307 or chemical ISO containers designed for caustic liquids.
- Unloading Method: Typically bottom unloaded using remote-controlled stop valves to limit operator exposure.
Required Equipment:
- Corrosion-Resistant Pumps & Hoses – Designed to withstand the caustic nature of White Liquor.
- Grounding & Bonding Systems – Prevents static discharge during transfers.
- Emergency Shower Stations – Positioned near loading sites to treat accidental exposure.
Products
Supervised Temporary Holding Cell
The Supervised Temporary Holding Cell provides secure wire partitions, lock options, and customizable configurations for controlled detainee confinement.
Evidence & Security Enclosures
The Evidence and Security Enclosures provide durable wire partitions, secure locks, and custom configurations for protected storage and restricted access.
Wire Mesh Partitions and Walls
The Wire Mesh Partitions provide secure, durable enclosures with custom configurations and multiple door options for industrial storage and access control.
Tool Cribs and Equipment Cages
The Tool Cribs and Equipment Cages provide secure, modular storage with easy installation, custom configurations, and durable wire partitions for industrial use.
Driver Cages and Building Access
Our access cages protect your inventory, as well as visitors, vendors, and other warehouse or building personnel.
Mobile Computer Cabinet w/ Welded Shelf
The Mobile Computer Cabinet features steel construction, a welded shelf, a 3-point lock, adjustable shelves, and casters for secure, mobile industrial storage.
4 Shelf Bin Storage Cabinet
The Heavy-Duty 4 Shelf Bin Storage Cabinet features steel construction, lockable bins, adjustable shelves, and a secure 3-point lock for industrial storage.
All Bin Cabinet
The Heavy-Duty All Bin Storage Cabinet features steel construction, lockable bins, a 3-point lock, and sturdy legs for secure industrial storage.
Top View Computer Cabinet w/ Retractable Keyboard
The Top View Computer Cabinet features 12-gauge steel, a retractable keyboard tray, a 3-point lock, and adjustable shelves for secure industrial storage.
Outdoor Storage Cabinet
The Heavy-Duty Outdoor Storage Cabinet features 12-gauge steel, adjustable shelves, a 3-point lock, and a weather-resistant design for secure industrial storage.
Outdoor Storage Cabinet w/ Angle Frame Base
The Heavy-Duty Outdoor Storage Cabinet features 12-gauge steel, an adjustable shelf, a 3-point lock, and a weather-resistant design for secure industrial storage.
Multi-Compartment Outdoor Cabinet
The Heavy-Duty Outdoor Cabinet features 12-gauge steel, 6 high-capacity drawers, a 3-point lock, and weather-resistant design for secure industrial storage.
Top View Computer Cabinet for Flat Screen
The Top View Computer Cabinet provides steel construction, a retractable keyboard tray, a 3-point lock, a power strip, and a slide-out shelf for secure industrial storage.
Extra Workspace Computer Cabinet
The Extra Workspace Computer Cabinet provides steel construction, a retractable keyboard tray, adjustable shelves, a cooling shelf, and a secure 3-point lock for industrial storage.
Multi-Data Entry Computer Cabinet
The Multi-Data Entry Computer Cabinet features steel construction, a 3-point lock, cooling shelf, adjustable storage, a power strip, and a filtration fan for secure industrial use.
Desktop Computer Cabinet
The Desktop Computer Cabinet features steel construction, a retractable keyboard tray, a 3-point lock, a power strip, and a filtration fan for secure industrial workstations.
Small Desktop Computer Cabinet
The Small Desktop Computer Cabinet features steel construction, a clear window, and a space-saving design for secure workstation storage.
2 Compartment Computer Workstation
The 2 Compartment Industrial Computer Workstation features steel construction, adjustable shelves, a power strip, a filtration fan, and a secure 3-point lock for durable industrial use.
In Plant System
The Industrial In-Plant Computer Cabinet features steel construction, adjustable shelves, a power strip, a filtration fan, and a secure 3-point lock for protected workspaces.
Workstation with Accessories
The Industrial Workstation with Accessories features steel construction, a keyboard tray, adjustable shelves, and a swivel stool for a secure, functional workspace.
3 Shelf Bin Cabinet
The 3 Shelf Bin Cabinet provides steel construction, lockable bins, adjustable shelves, and a secure 3-point lock for industrial storage.
4 Drawer Bin Cabinet
The Heavy-Duty 4 Drawer Bin Cabinet provides steel construction, lockable bins, adjustable shelves, and high-capacity drawers for secure industrial storage.
Bin Storage Cabinet w/ Wardrobe Shelves
The Bin Storage Cabinet with Wardrobe Shelves provides durable steel construction, lockable bins, adjustable shelves, and a secure 3-point lock for industrial storage.
Upright Tool Storage Bin Cabinet
The Upright Tool Storage Bin Cabinet features steel construction, lockable bins, adjustable shelves, a pegboard back, and a 3-point lock for secure industrial storage.
All Secure Full-Width Drawer Cabinet with Bins
The All Secure Full-Width Drawer Bin Cabinet provides durable steel construction, lockable bins, adjustable shelves, and heavy-duty drawers for secure industrial storage.
Extra Wide Bin Cabinet
The Extra Wide Bin Storage Cabinet features durable steel construction, lockable bins, adjustable shelves, and a secure 3-point lock for industrial storage.
King Size Bin & Shelf Storage Cabinet
The King Size Bin Storage Cabinet provides durable steel construction, lockable bins, an adjustable shelf, and a secure 3-point lock for industrial storage.
Countertop Bin Door Storage
The Countertop Bin Door Storage Cabinet provides durable steel construction, lockable bins, adjustable shelves, and a secure 3-point lock for industrial storage.
Long Tool and Bin Storage Cabinet
The Long Tool and Bin Storage Cabinet provides durable steel construction, lockable bins, and open shelving for secure industrial tool and part storage.
Slim Line Bin Storage
The Slim Line Bin Storage Cabinet offers compact, durable storage with 12-gauge steel construction, secure lockable bins, and a 3-point locking system, perfect for space-saving industrial organization.
One Sided 210 Bin Rack
The One-Sided 210 Bin Rack provides compact, organized storage with 210 small bins, ideal for maximizing space in workshops, factories, and parts storage areas.
Mobile Bin Rack
The Heavy-Duty Mobile Bin Rack provides durable steel construction, lockable bins, and mobility for secure industrial storage.
Loading Dock Stairs
Prefabricated IBC, ADA, or OSHA Loading Dock Steps
Signs and Signals
Signs and Signals
Top Loading Arms
Top Loading Arms
MaxRack Elevated Platforms
Powered elevating platform system for accessing railcars and trucks
Filters
White Liquor Solutions
Best Practices for Black Liquor Handling
- Only trained personnel should handle White Liquor due to its hazardous nature.
- Use proper PPE – chemical-resistant gloves, full-body protection, and face shields.
- Ensure ventilation systems are operational to prevent buildup of sulfur gases.
- Corrosion Prevention – Regularly inspect storage tanks, pipes, and loading arms for degradation.
- Emergency Response
- Move exposed personnel to fresh air immediately.
- Remove contaminated clothing and wash skin with soap and water.
- Flush eyes for 15 minutes if exposed.
- If ingested, do not induce vomiting—contact poison control immediately.
Critical Safety Warnings
⚠ Avoid contact with acids – May release toxic hydrogen sulfide gas.
⚠ Use only corrosion-resistant equipment – White Liquor is highly corrosive to standard metals.
⚠ Ensure proper ventilation – Sulfur gases pose serious inhalation risks in confined spaces.
Below are some of the loading and unloading solutions for illustrative purposes only. Our experts will work with you and your team for a custom solution to suit your needs.
Loading Gangways
A wider access gangway (48″-60″ is preferable) as it helps improve access and egress to and from the vessel. In addition, a wider gangway will reduce the risk of the operator’s PPE getting caught, torn or damaged, and will improve productivity and safety. Powered gangway solutions are also an option, with both hydraulic and pneumatic solutions being commonly used.
Loading Arms
In paper millls, Tall Oil Fatty Acid (TOFA), Black Liquor, White Liquor, and Green Liquor (Spent Pulping Liquor) is typically loaded into railcars or tank trucks via boom-supported stainless steel loading arms or chemical hoses with a flange connection. The arm or hose will have a top inlet with a control valve to ensure that it is self-draining after use and is supported along the length of a mechanical loading arm to improve handling, known as a by-pass arm. You can install one liquid and one vapor arm, or mount both the liquid and vapor hoses on one by-pass arm.
For unloading, typically you would use a rigid stainless steel self-draining loading arm with Buna-N, PTFE or Viton seals. Purge lines can be fitted to the arm, for nitrogen purging. Additional features such as parking latches with proximity sensors can be incorporated into the total system to ensure the arm is correctly stowed when not in use, before any rail movement can occur.
Eye Wash/Drench Showers
Spill containment pans will be provided at the point of loading operations and is an essential piece of equipment in overall site safety and environmental protection
Spill Containment
Spill containment pans will be provided at the point of loading operations and are an essential piece of equipment in overall site safety and environmental protection.
Wheel chocks allow for safe access to and storage of treatment chemicals, while spill containment pans utilized at the point of loading operations serve as essential safety and environmental protection tools.
Grounding
While much of the products being transferred in the pulp and paper manufacturing aren’t combustible, it is an industry best practice to include the grounding of all vessels before starting the (un)loading process.
Ground controllers — ensure true grounding before product flow is permitted
Explosion-proof enclosures — meet or exceed UL, CSA and Ex requirements
Non-sparking tools are also recommended while working around this product
Loading Platform Options
Lighting – General exterior and task lighting to illuminate work and walk areas.
Platform & Canopies – Full platform canopies reduce exposure to the elements and improve the safe and productive loading operation from the operator’s perspective.
Operator Shelter—Depending on your site requirements, consider the requirement of an operator or guard building to keep personnel out of the elements. This can be customized to meet specific site requirements.
Wheel Chocks – SPCC options to allow for safe access and storage of water treatment chemicals.
Safety Gates, Stairs, Ladders, & Platforms
Safety Gates will be installed at the top of stairs and any other openings to ensure operator safety.
SafeRack’s line of industrial safety gates is the most flexible product on the market with the ability to span openings between 16” and 36” and is field adjustable with nothing more than a wrench. We also have guardrails, metal handrails, and full-fledged fall protection solutions with customizable options to fit your needs.
Frequently Asked Questions
Yes, all AeroStep platforms meet or exceed OSHA safety standards, ensuring compliance for aircraft maintenance and ground support operations. Features such as enclosed handrails, slip-resistant surfaces, and adjustable height options enhance worker safety.
White Liquor 101
Things to know about White Liquor
White liquor is an aqueous solution of sodium hydroxide and sodium sulphide used in the Kraft process of making paper and corrugated boxes. Following debarking and chipping of resinous wood, the chipped wood pieces are “cooked” or digested with steam @ approximately 150 psig in the digester with the white liquor solution. After cooking for about 6 hours the lignin binder is dissolved and cellulose fibers, now called pulp or brown stock are separated from the spent cooking liquor (black liquor). The kraft process is associated with strong smelling gases, organic sulphides, which can be an environmental concern.
All the “cooking” liquors in the Kraft paper making process, whether white, green or black tend to be very corrosive and may contain several different toxic and hazardous ingredients. In addition, some of the processes may emit gases, vapors or dust that may be hazardous.
First aid measures for exposure include – removing operators from the source of exposure and into fresh air. Remove contaminated clothing immediately; wash skin thoroughly with soap and water; flush eyes with tepid water for 15 minutes. If ingested do not induce vomiting, but immediately call your local poison control center.
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