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7 Things to Look for When Buying Used CO2 Extraction Machine

When you are deciding what type of supercritical CO2 extraction machine to get, there are certainly plenty of choices. You have different machines, brands, designs, and extra features. You also may be wondering if you should get new or used equipment. Truthfully, buying used equipment can not only save you a lot of money, but you can still get the exact piece of equipment you need.

A Guide to Buying a Used Supercritical CO2 Extractor

New 2100L CO2 extraction machine

Buying a used CO2 extraction machine is a great way to save money when equipping a CO2 extraction business such as essential oils or pigments. But, like anything else, buying a used machine isn’t without risk. This guide will help you choose the right used CO2 essential oil extraction equipment, make sure it’s in good working order, and come with everything you need for operation.

If you find a previously used supercritical CO2 extraction machine that you want to buy, be sure you have all the information you need before closing the sale.

New vs Used CO2 Extraction Machine: How to Identify Which is Right for Your Needs

There certainly be advantages to buying a new or used supercritical CO2 extraction machine to start the essential oils business. There are many different things that will need to be considered.


Of course, your budget needs to be considered when you are looking at buying the industrial co2 extraction machine for your biomass extraction shop but don’t arbitrarily set your budget without first considering the needs you have of capacity, target extract, and the best extraction pressure that you will need. Buying used co2 essential oil extraction equipment can actually save you a lot of money over a new supercritical co2 extractor.


Technology is ever-advancing. Depending on what you need the co2 oil extractor to actually do will play a large role in what type is the best suited for you to buy. If you need it to do something extremely complicated, such as extracting astaxanthin directly from Haematococcus Pluvialis, while extracting chili oil and pigment, or extracting CBD oil to remove extra wax and chlorophyll and more terpenes, you may have difficulty finding that in a used co2 extractor.

7 Things to Consider When Purchasing a Used Supercritical CO2 Extraction Machine

Fabrication CO2 extraction machines are continually advancing due to the demand for certain types of extracts and the technology of controller and programming systems. Machines can do more, and make more, faster and easier than ever before so it is well worth your time to investigate what is new and whether or not it applies to your extraction business needs.

No 1: Remaining useful life

The design service life of the pressure vessel is an estimate given by the designer according to the expected service conditions of the vessel, and its function is to remind the user. Service beyond the design service life of the pressure vessel will objectively cause major safety hazards. When the design service life of the pressure vessel is exceeded, necessary measures should be taken, such as frequent thickness measurements and shortening of the inspection period.

Supercritical CO2 extraction equipment is actually high-pressure vessel equipment. Like other pressure vessels, they have service life requirements, which means that after a certain period of service, because of safety issues, supercritical CO2 extractors must be mandatorily retired. In China, they are designed to last 20 years.

So here comes the question, we have to find out the production date of the CO2 extraction machines from the equipment archives to calculate their remaining useful life.

No 2: Can It Do What I Need it To Extraction?

Obviously the most important aspect of buying any CO2 extraction machine is making sure it actually does the job for your budget and justifies it. In the long run, buying a supercritical CO2 extractor that is below capacity because it fits your budget will not do you any good, instead it will hinder your growth. In the extraction of biomass, this means that you need to ensure that it will work in the extract you expect to apply to the plant material you are preparing to use.

Additionally, you need to ensure that the CO2 extraction machine can keep up with your production and extract needs in a reasonable amount of time. You’ll also want to know what extra features it comes with or can add. Items such as customized ultra-high pressure (up to 1050 bar), supercritical rectification column, cold trap in separator (for terpene and vapour recovery during decarboxylation before extraction) and third separator in biomass extraction always important.

No 3: Inspect this CO2 extraction machine

It’s good to get a CO2 extractor, but make sure you don’t need to know the history of the machine. You can check the serial number on the device with the manufacturer to find some information, but usually, the manufacturer can’t tell you much. The manufacturer doesn’t know how the CO2 extractor is used, what repairs have been made (only parts ordered from them), and the general condition of the machine.

We have two ways to inspect

  • Inspect Method 1#: Obtain the production records of the control system of the machine (provided that the machine must be equipped with a PLC or CNC control system), from the records we can know the last extraction production, extraction pressure, CO2 flow, time And so on, so as to judge whether the machine can normally carry out the biomass extraction work.
  • Inspect Method 2#: Carry out a test, we can carry out a cleaning test of the machine, why is it a cleaning test? Because the cleaning test process is similar to the extraction process, it can also increase the pressure, control the temperature, increase the CO2 flow, and even test the limit production capacity of the machine. The most important thing is that it tests the co-solvent system at the same time, and also lets us know the inside of the machine of cleanliness.

Through the above two points, we can know the actual working condition of the machine, so as to judge whether it is the extraction equipment you need.

No 4: Extraction capacity of the machine

Of course, before buying used CO2 extraction equipment, you already know its extraction capacity. To be precise, you already know the total extraction capacity of the machine. For example, it is a 300L extraction capacity machine.

Under normal circumstances, for the manufacturer, a 300L can have three models: 50L6, 100L3, and 150L*2, which have 6, 3, and 2 extraction vessels respectively.

Although they have the same total extraction capacity, the actual extraction capacity of 100L*3 per 24 hours is larger than the other two.

In terms of extraction effect, due to the machine design process, the effect of 50L*6 is not as good as that of the other two machines. There will always be unextracted residues left over from biomass, which means that the extraction is not complete. When extracting high-value biomass, this is a fatal error.

No 5: Is it an energy efficient machine

Used machines cost very little, though, we also need to consider running costs.

Such as energy saving, whether it uses a variable frequency power system, which will allow you to save some energy.

In addition, although CO2 gas is free in nature, in fact reading yours is providing it to nature for free, but the gas used in the CO2 extraction process is food grade and needs to be purchased from the factory. Then on the pilot-level CO2 extraction machine, we recommend being equipped with a tail gas recovery system, which can recover some gas from the extraction vessel, and more importantly, it can use the gas cylinder to a pressure lower than one atmosphere, which means that you can Make the most of the co2 gas you buy.

No 6: How much space does this CO2 extraction machine take up?

Make sure there is enough space for the used CO2 extraction machine. If the machine working at the original owner takes up a lot of space, you must first consider the height. The height of your workshop must meet its requirements. As for the area, it can be changed. For example, move equipment such as chiller air supply to a nearby space.

Of course, you’re willing to build a whole new space for this used CO2 extraction machine, but that’s another story.

No 7: Service and Parts

Will there be any kind of warranty or service involved if you need it? If needed, are there services available? Are parts available? Unfortunately, unlike other manufacturing machinery, CO2 essential oil extraction equipment, they are very “user non-maintainable”, so maintenance and repairs are not easy for the owner, you need to contact the manufacturer to buy consumables, such as gaskets and many more.

There are also services, you need to obtain technical support during operation, it is very important to obtain the contact information of the manufacturer, and a good manufacturer is even more important, so before purchasing, you need to contact the manufacturer to confirm that you can obtain follow-up support and serve.

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