Filtration in the Hemp and CBD Oil Extraction Industry

As cannabis legalization spreads throughout the U.S., the number of unique businesses entering the industry and shaking things up is rapidly increasing. One innovation that’s taking the cannabis scene by storm is the legal sale of products crafted from cannabidiol (CBD) oil, which appears in numerous forms.

Wondering how this could relate to M.W. Watermark’s filter presses? Keep reading, and we’ll dig into the relationship between the hemp and CBD oil industry and industrial filtration.

M.W. Watermark manufactures filter presses for CBD and hemp oil filtration; CO2 Extraction; Solvent Extraction; Ethanol Extraction

An Introduction to the CBD and Hemp Oil Extraction Industry

Before we connect the CBD industry to industrial filtration, let’s discuss what CBD is and how it’s extracted.

CBD is an abbreviation for cannabidiol, a chemical compound derived from the hemp plant. Unlike many other compounds associated with cannabis, the CBD found in hemp doesn’t deliver a high, and is instead used with the intent of treating an array of medical conditions. CBD products are now legally available in nearly every U.S. state in some capacity, and they come in many forms, from edibles to prescription drugs.

M.W. Watermark Filter Presses for CBD Oil Extraction from Hemp; CO2 Extraction; Solvent Extraction; Ethanol Extraction

How Do Filter Presses Come Into Play?

When it comes to CBD oil, solid-liquid separation enters the picture when it’s time to extract the CBD from the hemp plant. There are many methods for botanical extraction, but most include employing filtration to help ensure a more pure, effective product.

Popular Methods of Botanical Extraction Involving Filtration

CO2 Extraction, also referred to as Supercritical or Winterization, is one such method which takes advantage of the differing solubility of waxes and cannabinoids at temperatures below the freezing point. Essentially, the frozen wax from the hemp plant containing cannabidiol oil is stripped from the plant using carbon dioxide. The wax is then separated from the solvent using a filter press. This separation step is often referred to as “dewaxing”.

M.W. Watermark Manufactures Filter Presses for CBD Oil Extraction from Hemp; CO2 Extraction; Winterization; Solvent Extraction; Ethanol Extraction

Solvent Extraction, also known as Hemp Bio Mass, is another common method which utilizes a maceration process where ground-up hemp is mixed with a solvent such as ethanol, heptane or hexane. (Oftentimes, the extraction process is ultrasound-assisted, via an ultrasonic bath). The solvent strips the CBD oil out of the plant fibers, and then the hemp oil/solvent combination is run through a filter press as a slurry. The solvent is then distilled off, resulting in pure hemp oil. The oil can then be further distilled and purified, if desired.

Chlorophyll Removal

Following extraction, the color of the product is generally dark brown or green due to the presence of chlorophyll. An additional step referred to as “activated carbon filtration” can improve the color without sacrificing quality. A filter press can also be effectively utilized for this step – accomplished when paired with specialized carbon-infused filter media.

CBD Oil Prior to Activated Carbon Filtration to Remove Chlorophyll
CBD Oil Prior to Activated Carbon Filtration to Remove Chlorophyll
CBD Oil Following Activated Carbon Filtration to Remove Chlorophyll
CBD Oil Following Activated Carbon Filtration to Remove Chlorophyll

In summary, filter presses are being used for:

  • Separation of biomass from solvent
  • Separation of plant lipids and waxes following winterization
  • Chlorophyll removal (activated carbon filtration)
  • Removal of activated carbon from oil
Download Our CBD Oil Extraction Brochure

M.W. Watermark CBD Hemp Oil Filter Press; CO2 Extraction; Solvent Extraction; Ethanol Extraction

M.W. Watermark CBD Hemp Oil Filter Cake; hemp bio mass filtration method
Filter cake (shown from hemp bio mass method) accumulates on the filter cloths and then drops into a dumpster once the cycle has completed and the filter press is opened.
M.W. Watermark CBD Oil Extraction from Hemp. Wax cake from the winterized process builds up on the filter cloths during pressure filtration. CO2 extraction.. Winterization.
Wax cake from the winterized process builds up on the filter cloths during pressure filtration.
M.W. Watermark CBD Oil Extraction from Hemp. A filter cake containing plant waxes resulting from the winterization process.
A filter cake containing plant waxes resulting from the winterization process.



Benefits of Using a Filter Press

Many businesses involved in CBD oil extraction from hemp are realizing multiple benefits from utilizing a filter press including increased speed of production and a higher-quality product.

For example, when a smaller operation moves from using basic filtration media such as brewery bags to the filter cloths found in a filter press, they are finding new levels of production efficiency and speed. Filter cloths are re-usable, versus brewery bags, which are designed for a one-time use. Also, brewery bags are hung up and the hemp is drained via the gravity method, which takes quite a bit more time than pressure filtration using a filter press. Ultimately, employing a filter press results in a more controlled production environment, contributing to a higher-quality product.

Another benefit is that M.W. Watermark offers FDA-compliant filter cloths and filter plates, as well as manifold piping and hydraulic oil and systems designed to combat contamination.

Our selection of easy-to-clean equipment includes a stainless steel manifold with tri-clamp fittings, which is designed to be quickly disassembled for nearly effortless sanitization.

Each of these M.W. Watermark 630mm hemp oil extraction filter presses feature a stainless steel manifold with tri-clamp fittings that allow for ease of disassembly when cleaning. CO2 Extraction; Solvent Extraction; Ethanol Extraction
Each of these M.W. Watermark 630mm hemp oil extraction filter presses feature a stainless steel manifold with tri-clamp fittings that allow for ease of disassembly when cleaning.
Stainless steel manifold with tri-clamp fittings that allow for ease of disassembly when cleaning. CO2 Extraction; Solvent Extraction; Ethanol Extraction
Close-up view of a stainless steel manifold with tri-clamp fittings.

Industry Events

MJ BIZ CON
Hope you had a chance to visit us in Booth #1233 at MJ BIZ CON – NEXT in New Orleans, June 12-14, to learn more about how filter presses are being used for CBD oil extraction from hemp.
If you were not in attendance, connect with us today, or stop by and see us in Booth #C4537 at MJ BIZ CON in Las Vegas, December 11-13.

M.W. Watermark to exhibit at MJ Biz Con in Las Vegas December 11-13, 2019

M.W. Watermark builds filter presses for fast and efficient filtration for solvent extraction and dewaxing.

Recent CBD Oil Filter Press Photos

Our filter presses can be custom-built to meet your specifications.
Different sizes are available based on the volume of your operation.
M.W. Watermark 800mm filter press built for CBD oil extraction from hemp. CO2 Extraction; Solvent Extraction; Ethanol Extraction
M.W. Watermark 800mm filter press built for CBD oil extraction from hemp.
M.W. Watermark 470mm filter press designed for CBD oil extraction from hemp. CO2 Extraction; Solvent Extraction; Ethanol Extraction
M.W. Watermark 470mm filter press designed for CBD oil extraction from hemp.
M.W. Watermark 320mm filter press manufactured for CBD oil extraction from hemp. CO2 Extraction; Solvent Extraction; Ethanol Extraction
M.W. Watermark 320mm filter press manufactured for CBD oil extraction from hemp.
M.W. Watermark 320mm hemp oil filter press with precoat system. CO2 Extraction; Solvent Extraction; Ethanol Extraction
M.W. Watermark 320mm hemp oil filter press with precoat system.

Industrial Filtration Experts

At M.W. Watermark, we  design and build filter presses and other water and wastewater treatment equipment to separate solids from liquids across a wide range of industries and applicationsincluding CBD oil extraction.

Visit our filter press webpage to learn more, or contact M.W. Watermark today to discuss your application with one of our industrial filtration experts.