Clean. Safe. Versatile. Discover why CO2 Extraction is the superior method for For purer separation the Hi-Flo FX2 with fractionation is the perfect tool. So are you ready for a cleaner, purer, tastier, safer and overall truly Well, have we got a treat for you: supercritical CO2 extraction! That's not. Carbon dioxide cleaning (CO2 cleaning) comprises a family of methods for parts cleaning and Material costs are comparatively low, although ultra-pure CO2 must often be used to avoid the In addition, care must be taken to prevent the concentration of carbon dioxide in the work area from exceeding safe levels.
purer with CO2 Safer, cleaner,
Specialty oils, for example, are high in value and typically low in volume. They have high concentrations of bioactive lipid components that are valued because of various possible health benefits. Herbal extracts from a wide range of botanical raw materials are used as ingredients to the food-and-flavor, nutraceuticals, pharmaceuticals and the cosmetics industries. Supercritical CO 2 extraction can also be used to purify materials that are used for the production of medical devices.
These high-value-product applications typically involve small volumes. Flexible, medium-capacity plants for supercritical CO 2 extraction offer toll processing for these smaller volume products. The most important driving force for using supercritical CO 2 in this application area is that it is a generally recognized as safe GRAS solvent that leaves no traces in the product.
GRAS is the U. Food and Drug Admin. The high capital cost of building and operating a production plant utilizing supercritical extraction promotes expanding the use of the plant to a multi-product platform. Selective extraction of multiple products can be accomplished by modifying the solvent power of the supercritical fluid. The solvent power is modified by varying the extraction pressure or by adding a co-solvent. Another method to extract multiple products is by sequential depressurization, in which all products are extracted simultaneously.
The separation step is performed sequentially through a series of separator vessels. This process is referred to as fractional separation. In fact, extraction of food and natural products using supercritical or liquid CO 2 can be considered a relatively mature CO 2 technology. A wide range of other applications for supercritical CO 2 has been investigated, including chemical reactions, polymer production and processing, semiconductor processing, powder production, environmental and soil remediation and dry cleaning.
Commercialization for these applications has, however, proceeded at a slower pace than for extraction. Several of these applications are highlighted here. Supercritical CO 2 has been tested in a variety of industrially important reactions, such as alkylations, hydroformylations, and hydrogenation, as an alternative reaction medium.
Relatively high rates of molecular diffusion and heat transfer are possible with a homogenous, supercritical-CO 2 reaction-medium. Limitations to the use of supercritical CO 2 as a reaction medium include a poor solubility of polar and high-molecular-weight species, b no observed improvement in reaction chemistry in some cases, and c higher capital investment cost due to higher operating pressures. For reactions not limited by reactant-gas concentrations or other mass-transfer limitations, there is no improvement in reactivity observed when using a homogeneous, supercritical CO 2 medium.
Polymer production and processing. Applications of supercritical CO 2 in polymers include polymerization, polymer composite production, polymer blending, particle production, and microcellular foaming. Several applications, particularly those involving low pressures, have been successfully commercialized. At moderate pressure, very few polymers, except for certain amorphous fluoropolymers and silicones, show any significant solubility in CO 2.
Very high pressure is typically needed to dissolve polymers in supercritical CO 2. Its solvent power is weaker than that of n -alkanes. However, high degrees of swelling of the polymer by CO 2 can occur at significantly lower pressure.
Although many polymers have very low solubility in CO 2 , the solubility of CO 2 in polymers is typically high. This has led to the use of CO 2 as a plasticizer.
One example of this application area is a process to produce fluoropolymers using supercritical CO 2 as the reaction medium that was developed by scientists at the University of North Carolina Chapel Hill.
DuPont has an exclusive license for this process until The pilot plant is capable of producing 1, metric tons per year m. The CO2 plants produce product to meet the demand for the largest customers, thus any plant making CO2 for beverage application and having distribution to Coke, for example, makes product to meet that spec.
So, it certainly meets what you need it for too. The truck that carries the product will likely be kept in captive service but that is not required. A similar situation exists for medical O2, USP grade. The plant makes it, ships it in any old O2 truck they are all super clean anyway and puts it in the same bulk tank as that from which we fill welding and cutting grade, Industrial, oxygen. There are strict controls over the USP filling process that will safeguard patients using the gas, but the spec is typically the lowest purity by percentage.
Plant piping is chosen for pressure and purity and can be brass of a certain type, stainless tubing or even monel. Acetylene plants use black iron pipe. CO2 is sourced at other plants, some of which may contain ammonia as a trace contaminant, as well as other bad actors. As can be expected, beverage product does not come from there. So, the first control is exercised when we choose the source of the gas.
The next control comes from conventional gas quality instrumentation such as the use of gas chromatography, IR spectroscopy, flame ionization hydrocarbon analysis and trace O2 analysis. The CO2 grades can be: Oh, and beverage grade too. So, one company's offering may name a grade with similar nomenclature, but the specs will be different. Quality is controlled by choosing the sources and then doing the analysis. If you want to know what you are getting, ask for a spec sheet for the gas which gives guaranteed minimum purity for any CO2 marketed under whatever grade you happen to be getting from the gas company.
This just catalog spec. If it is from a gas company such as Praxair, Air Liquide, or Linde, this info is easily found on their websites. If you are getting product from a distributor, the good ones will easily provide this as well. If they can't get a better source who will. NuCO2 is a national beverage gas supplier bought by Praxair a while ago and is dedicated to bev carb. In general, it is best to tell your gas supplier the intended use, ask what grade you should use, and why.
Take a look at Praxair wersite and beverage carbonation for a good example. Food grade CO2 is not meant for human consumption. For that, you should use Beverage Grade, which is more pure than Medical Grade.
Both major soft drink companies have Beverage Grade as their minimum guideline. Food Grade CO2 is a dirty gas that isn't tested for several carcinogens Both beverage and food grade co2 both have a Industrial co2 has a Food grade co2 is in fact beverage grade co2. If you search "beverage grade co2" on Air gas's website it pulls up food grade co2. Its all about the purity of the gas. All co2 is made the same according to the employee at airgas.
Its all about how the co2 is stored and handled, and the FDA has put compliance laws on food aka beverage grade co2, making distributers store the gas in specific tanks just for food or beverage grade. The comments above stating that food grade co2 is "dirty gas" is invalid. Its pure enough for human consumption based on FDA compliance. Environmentally Friendly Cleaning Liquid - Solvair uses an environmentally friendly, biodegradable cleaning liquid to remove stains and dirt, conceptually similar to water and detergent in home laundry.
This cleaning liquid is drained then later purified and reused by the system. Pressurization - Once the garments have been cleaned they are damp and need to be dried. A major benefit of the process is that drying is performed without heat.
Solvair uses liquid carbon dioxide CO2 for drying. Under pressure, CO2 becomes a liquid and is used to rinse the cleaning liquid from the garments. This is the same kind of CO2 that gives carbonated beverages their bubbles. The cleaning liquid is attracted to the liquid CO2. This allows multiple cool liquid CO2 rinse and drain cycles to be used to thoroughly remove cleaning liquid from the clothes. Depressurizing - At the end of the drying cycle, the pressure in the machine is reduced until the CO2 converts from a liquid to a gas, completely and instantly drying garments.
This is a far more effective and energy efficient method of drying than using heat. Garments dry completely and simultaneously, regardless of weight. This means that a heavy coat and a silk blouse will dry at the exact same time.
Supercritical CO2: A Green Solvent
DfE-recognized products are safer for people and the planet and have CO2 dry cleaning uses natural liquid carbon dioxide (recycled from industry wherever using detergents to clean garments while rinsing in % Pure CO2, leaving the . Why should you use subcritical and supercritical CO2 extraction systems? What's the difference A safer, cleaner, purer & faster way to extract botanical oils. Apeks Supercritical manufacturers efficient CO2 botanical oil extraction subcritical and supercritical CO2 – a safer, cleaner, purer way to extract plant oils.