How Ethanol Recovery Systems Improve Cannabis and Hemp Oil Processing

Ethanol extraction is widely used in cannabis and hemp processing because it can support efficient extraction at a commercial scale. However, extracting compounds from plant material is only one stage of the operation. Once extraction is complete, the ethanol must be separated from the cannabis or hemp oil concentrate.

This solvent-removal stage can influence production speed, operating costs, solvent consumption and batch-to-batch consistency. If a facility relies on a slow or inefficient process, solvent recovery can quickly become a production bottleneck.

 

A purpose-built ethanol recovery system gives processors a more controlled way to remove, collect and reuse ethanol. The CannaTrue™ SRS Series is designed specifically for solvent removal and recycling during cannabis and hemp oil processing, helping facilities manage larger production volumes while reducing their dependence on newly purchased solvent.

What Is Ethanol Recovery in Cannabis Processing?

Ethanol recovery is the process of separating ethanol from the extracted cannabis or hemp oil solution. After plant material has been washed with ethanol, the resulting solution contains both the desired extract and a significant amount of solvent.

The ethanol must be removed before the concentrate can move into later processing or refinement stages. Instead of treating the recovered ethanol as waste, processors can collect and reuse it when the solvent meets their operational and quality requirements.

An ethanol recovery system generally uses controlled distillation. Because ethanol and the concentrated oil have different boiling characteristics, heat can be used to evaporate the ethanol. The ethanol vapor is then condensed back into liquid form and collected for potential reuse.

The concentrated cannabis or hemp oil remains in the processing vessel for the next production stage.

Why Solvent Recovery Matters to Commercial Processors

At lower production volumes, solvent removal may seem like a supporting task. As throughput increases, however, it becomes a central part of the production workflow.

A cannabis processing facility may handle substantial amounts of ethanol across multiple extraction cycles. Without an efficient recovery process, the facility can face increasing solvent purchases, additional handling requirements and delays between extraction and downstream refinement.

Bringing solvent recovery into a controlled, enclosed system can help a processor address several operational priorities at once.

Lower ongoing ethanol purchases

Ethanol is a recurring production expense. When usable ethanol leaves the process as waste, a facility must continually purchase replacement solvent.

Recovering ethanol allows processors to return a portion of that solvent to the production cycle. Over time, this can reduce the amount of new ethanol required and help protect the operation from changes in solvent pricing or availability.

Actual savings will depend on production volume, ethanol cost, solvent concentration and the number of times the recovered ethanol can be reused.

More efficient production flow

Extraction equipment can only deliver its full potential when the next stage of the process is ready to receive the extracted solution. If solvent removal takes too long, material may begin to accumulate between production stages.

An ethanol recovery system sized for the facility’s workload can help keep material moving. This is particularly important for processors increasing batch sizes or moving from small-scale production to routine commercial processing.

Reduced solvent waste

Recovering ethanol at the facility can reduce the amount of solvent that must be managed as waste. This may help lower waste-handling demands and support broader sustainability goals.

Solvent recycling does not eliminate the need for proper waste-management procedures. Residual material and solvent that cannot be reused must still be handled according to applicable facility policies and regulatory requirements.

Greater process control

Manual or loosely controlled solvent-removal methods may create variations in cycle conditions. Automated equipment allows important operating parameters to be monitored more consistently.

The CannaTrue SRS Series includes PLC controls, on-screen cycle progress and diagnostic monitoring. These features give operators greater visibility into the recovery cycle and can make it easier to follow a repeatable operating procedure.

How the CannaTrue SRS Series Supports Solvent Removal

The CannaTrue SRS Series consists of automated batch systems developed for removing and recovering solvent from cannabis and hemp oil concentrates.

The systems are designed for processors using ethanol and can recover solvent at greater than 90% of its original concentration. Published solvent recovery rates range from approximately 3 to more than 6 gallons per hour, although actual results can vary according to solvent-mixture ratios, concentrate concentrations and the number of solvent reuse cycles.

For processors, this means the system is not simply intended to evaporate ethanol. It is designed to recover the solvent in a form that may be suitable for reuse within the facility’s established process.

Multiple processing capacities

Cannabis and hemp operations do not all work at the same scale. A small processing facility may have very different throughput requirements from a high-volume producer.

The CannaTrue SRS systems are available in 8-, 15- and 30-gallon capacities. These choices allow facilities to select a model that more closely matches their current batch volume and production goals.

Choosing an appropriate capacity is important. Equipment that is too small may create longer queues between extraction and solvent recovery. A system that is significantly larger than necessary may not align with the facility’s present workflow or available space.

Enclosed operation

The SRS Series operates within a controlled and enclosed environment inside the equipment’s footprint. This design helps facilities manage solvent removal in a more organized and controlled manner.

The system must still be installed with the required ventilation, electrical configuration and operating safeguards. Site conditions should be evaluated before equipment selection and installation.

Automated cycle management

Automation can reduce the amount of continuous manual attention required during each batch. Standard PLC controls provide operators with information about cycle progress and system diagnostics.

This visibility can help teams recognize operating issues, document procedures and train employees to use the equipment consistently. Automation does not replace qualified operators, but it can support a clearer and more repeatable workflow.

Stainless-steel construction

The systems use stainless-steel construction, including a 304 stainless-steel boiling tank. Stainless steel is commonly selected for processing equipment because it offers durability and is suited to regular cleaning and production use.

For a facility operating multiple recovery cycles, equipment construction can have an important effect on maintenance planning and long-term reliability.

Built-in equipment safeguards

Solvent recovery requires careful control of temperature, pressure, ventilation and electrical conditions. CannaTrue SRS systems incorporate multiple emergency shutdowns and a pressure-relief valve.

The systems are UL 2208 and UL 61010 certified for use in non-hazardous environments. Facility owners should confirm that the selected system, installation area and supporting utilities meet all applicable safety requirements before operation.

Understanding the SRS-1 and SRS-2 Options

The CannaTrue line includes the SRS-1 and SRS-2 solvent-removal systems. Both are automated batch systems designed for cannabis and hemp oil concentrate processing.

The SRS-1 provides the core capabilities required for controlled solvent removal and recovery. It is available in multiple capacities and requires venting to the outside atmosphere or an appropriate ventilation system.

The SRS-2 configuration adds vacuum assistance and a chiller. Vacuum assistance can support solvent removal under reduced-pressure conditions, while the chiller assists with controlling condensation during recovery.

The correct configuration depends on factors such as:

• The amount of ethanol processed during each batch
• Required production throughput
• Concentrate characteristics
• Available floor space
• Electrical service at the facility
• Ventilation infrastructure
• Cooling and vacuum requirements
• Plans for future production growth

Processors should evaluate the complete workflow rather than selecting equipment based only on vessel capacity.

Where Solvent Recovery Fits in the Extraction Workflow

A solvent recovery system is part of a larger cannabis or hemp processing operation. It does not perform every extraction and refinement task on its own.

A typical ethanol-based workflow may include preparing the plant material, extracting it with ethanol, separating the plant solids, removing and recovering the ethanol, and then sending the resulting concentrate to the appropriate downstream process.

The SRS Series is used during the solvent-removal and recovery stage. Making this distinction is important when planning equipment because the recovery system must be coordinated with both upstream extraction volume and downstream processing capacity.

If the extraction stage produces material faster than the recovery system can process it, the facility may still experience delays. If downstream equipment cannot accept the recovered concentrate promptly, improving recovery speed alone may not solve the overall bottleneck.

A balanced production line considers the capacity of every stage.

What to Consider When Selecting an Ethanol Recovery System

Before investing in cannabis solvent recovery equipment, a facility should review its current operations and anticipated growth.

Start by determining how much ethanol-containing solution is produced per shift or per day. This provides a more useful sizing basis than considering plant material volume alone.

Facilities should also calculate current ethanol purchases and waste-disposal costs. These figures can help estimate the potential financial impact of recovering solvent onsite.

Additional questions include:

• How many extraction batches are completed each day?
• How much solvent must be removed from each batch?
• How quickly must the concentrate move to the next stage?
• Is single-phase or three-phase power available?
• Does the proposed room have suitable ventilation?
• Is vacuum-assisted processing required?
• Is there enough space for the system and safe operator access?
• Who will maintain and service the equipment?
• Could production volume increase over the next several years?

Answering these questions before equipment selection can reduce the risk of introducing a new bottleneck into the facility.

Building a More Sustainable Processing Operation

Sustainability in cannabis processing is often discussed in terms of cultivation, packaging or energy consumption. Solvent management deserves equal attention.

When a facility recovers ethanol for reuse, it can reduce its reliance on newly purchased solvent and decrease the volume of solvent entering its waste stream. The result may be a more resource-efficient production model with lower recurring material requirements.

The operational value is equally important. A dependable recovery process can help facilities create more predictable schedules, support higher production volumes and maintain a repeatable approach from one batch to the next.

For commercial cannabis and hemp processors, solvent recovery is therefore more than a waste-reduction measure. It can become an important part of production planning and cost control.

Frequently Asked Questions About Cannabis Solvent Recovery

What does an ethanol recovery system do?

An ethanol recovery system separates ethanol from cannabis or hemp oil concentrate after extraction. The ethanol is evaporated, condensed and collected so it may be reused, while the concentrated oil remains for further processing.

Can recovered ethanol be reused for cannabis extraction?

Recovered ethanol may be suitable for reuse depending on its concentration, purity and the facility’s production requirements. Processors should establish appropriate testing and quality-control procedures before returning recovered solvent to the extraction process.

How much ethanol can the CannaTrue SRS Series recover?

The CannaTrue SRS Series is designed to recover solvent at greater than 90% of its original concentration. Its published recovery rate is approximately 3–6+ gallons per hour. Actual performance varies according to the solvent mixture, concentrate concentration and reuse history.

Is the CannaTrue SRS Series an extraction system?

The SRS Series is primarily a solvent-removal and recycling system. It is used after ethanol extraction to separate the solvent from the cannabis or hemp oil concentrate.

What capacities are available?

CannaTrue SRS systems are available in 8-gallon, 15-gallon and 30-gallon capacities, allowing processors to select equipment based on their production volume and facility requirements.

What is the difference between the SRS-1 and SRS-2?

Both systems provide automated batch solvent removal. The SRS-2 configuration includes vacuum assistance and a chiller, while the SRS-1 does not. A processor should choose a configuration based on throughput, utilities, process conditions and facility layout.

Improve Cannabis and Hemp Solvent Recovery with CannaTrue

As cannabis and hemp production expands, efficient solvent removal becomes increasingly important. Recovering ethanol onsite can help reduce solvent purchases, limit waste, improve workflow and support more consistent batch processing.

CannaTrue SRS Series systems provide automated ethanol removal and recovery in multiple processing capacities. With programmable controls, stainless-steel construction, system monitoring and available vacuum-assisted configurations, the series can be matched to a variety of cannabis and hemp processing operations.

Facilities considering a new recovery system should evaluate production volume, utilities, ventilation, workflow and future growth before selecting a model.

Contact CBG Biotech to discuss your cannabis or hemp processing requirements and determine which CannaTrue SRS Series system is appropriate for your facility.