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Chemtron Science Laboratories Private Limited
Chemtron Science Laboratories Private Limited Chemtron Science Laboratories Private Limited Chemtron Science Laboratories Private Limited Chemtron Science Laboratories Private Limited
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Supercritical Carbon Di Oxide Extraction Systems

The Theory
Supercritical Fluid Extraction (SFE) is the process of separating one component (the extractant) from another (the matrix) using supercritical fluids as the extracting solvent. Extraction is usually from a solid matrix, but can also be from liquids. SFE can be used as a sample preparation step for analytical purposes, or on a larger scale to either strip unwanted material from a product (e.g. decaffeination) or collect a desired product (e.g. essential oils). Carbon dioxide (CO2) is the most used supercritical fluid, sometimes modified by co-solvents such as ethanol or methanol. Extraction conditions for supercritical CO2 are above the critical temperature of 31°C and critical pressure of 74 Bar. Addition of modifiers may slightly alter this. The discussion below will mainly refer to extraction with CO2, except where specified.

Chemtron and Supercritical Extraction
It is great pleasure introduce ourselves as ‘Single Source’ for Design, Supply, and Installation & Commissioning of Super Critical Extraction plants based on Co2 Gas of various sizes like 0.5 liter capacity. We are work in this technology for the past 5 years. It started for academic interest and now we have designed and supplied 10 ltr pilot plant to customers. Chemtron Science Lab Pvt Ltd is ISO 9001 certified and has a existence of 17 years as on 2009 in the business of gases.

Services provide by Chemtron in contract research
We also offer a variety of service for supercritical extraction including extraction of material on job basis.

We also undertake research samples of commercial scale production, and develop optimum condition for extraction and commercial scale planning and project report for finance option from commercial banks. Please contact us and give a detailed description of your needs.

We can provide complete solution for extraction by Supercritical Co2 method that includes:
  • Complete Plant machinery and instrumentation on turn key basis.
  • Maintenance and support needed to run the plants based on this indigenously developed technology
  • Analytical support for methods of analysis of active ingredients available in the extracts of herbs and spices

The total cost of our indigenously developed system is 1/5 th the cost of imported systems of same capacities.

The Extraction Process
The residue consists of all other substances that are present in the feed the oil soluble substances are a range of chemicals with different molecular weights. They exhibit a solubility pattern inversely proportional to their molecular weights at any given temperature and pressure. The presence of different organic substituted groups also affects the solubility. Lower molecular weight components are extracted faster and have higher solubility in CO2, while higher molecular weight components have a lower solubility and consequently lower extraction rates. Once the extract is obtained, it is clarified, and water is separated out and the material is filled in containers. This extract is called the total extract.

Supercritical fractionation
Sometimes there is a need to separate the low boiling essential oils or other active ingredients from the high boiling components of the combined total extract. This can be done using our liquid supercritical fractionation column. This is a continuous operation w.r.t. both the extract and CO2. The bottom end of the fractionator is a mixture of un-extracted material. The top section carries the extracted low boiling components along with CO2.

Lab Scale
  • Extraction Vessels (Extractor)
  • Capacity: 0.1 to 2 Liters.
  • Design Pressure: 400 bars
  • Operating Pressure: 350 bars
  • Design Temperature: 100 C.
  • HIGH PRESSURE PRODUCT SEPARATOR:
  • Capacity: 0.1 to 1 Liters
  • No. In the System: 2 or 3
  • Design Pressure: 300 bars.
  • Operating Pressure: 250 bars.
  • Design Temperature: 100 C.

Pilot Scale

10 L Pilot plant
  • Extraction Vessels (Extractor)
  • Capacity: 10 Liters.
  • Design Pressure: 400 bars
  • Operating Pressure: 350 bars
  • Design Temperature: 100 C.
  • HIGH PRESSURE PRODUCT SEPARATOR:
  • Capacity: 2 to 5 Liters
  • No. In the System: 2 or 3
  • Design Pressure: 300 bars.
  • Operating Pressure: 250 bars.
  • Design Temperature: 100 C.

20 L Pilot plant
  • Extraction Vessels (Extractor)
  • Capacity: 50 to 200 Liters.
  • Design Pressure: 400 bars
  • Operating Pressure: 350 bars
  • Design Temperature: 100 C.
  • HIGH PRESSURE PRODUCT SEPARATOR:
  • Capacity: 10 to 15 Liters
  • No. In the System: 2 or 3
  • Design Pressure: 300 bars.
  • Operating Pressure: 250 bars.
  • Design Temperature: 100 C.

Sr Solvent extraction SCF extraction
Solvent presence is unavoidable. The residual ppm level of the solvent depends on the type of solvent used. Is totally free of solvents and hence very pure
Heavy metal content is also unavoidable and depends on the solvent, the recycle method for the solvent, the source of the raw material, and the material of construction of the contact parts of the machinery. Totally free of heavy metals since they are not extractable even if they are present in the raw material. No heavy metals are present in CO2 and the equipment
Inorganic salt content cannot be avoided, using the same concept as above Totally free of inorganic salts using the same explanation as above
Polar substances get dissolved along with the lipophilic substances from the raw material due to poor selectivity of the solvent. During solvent removal operation, these polar substances form polymers, which lead to dark color of extract and poor flow characteristics. All this renders the extract to look different from the basic components in the raw material and hence it is more of a "pseudo" natural extract. Totally free of inorganic salts using the same explanation as above No such possibility since there is very high selectivity of CO2 and no chance of polar substances forming polymers. In addition the operating temperature is only 40-50 degree Celsius.
Both polar as well as non polar colors are extracted Only non polar colors get extracted
Solvent removal requires extra unit operations and hence the cost and recovery of useful material is lower No extra unit operations needed and yield of useful material is very high

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