Infinity Supercritical LLC


Publication Title | What is a Supercritical Fluid

Cannabis Search Engine Series

Cannabis | CO2 Extraction | Oil Extraction | Supercritical CO2 Fluid Extraction search was updated real-time via Filemaker on:

Cannabis | CO2 Extraction | Oil Extraction | Supercritical CO2 Fluid Extraction | Return to Search List

Search Completed | Title | What is a Supercritical Fluid
Original File Name Searched: What is a Supercritical Fluid.pdf | Google It | Yahoo | Bing



Page Number: 001
Previous Page View | Next Page View

Text | What is a Supercritical Fluid | 001



1. Definition

What is a Supercritical Fluid ?

Supercritical Fluid: Fluid over its critical temperature and pressure, exhibiting good solvent power ; in most applications, carbon dioxide is used pure or added with a co-solvent ; the main interest of supercritical fluids is related to their “ tunable ” properties, that can be changed easily by monitoring pressure and temperature : good solvent power at high densities (temperature near critical temperature and pressure much over critical pressure) to very low solvent power at low densities (temperature near or higher critical temperature and pressure lower critical pressure).

2. Carbon dioxide and other fluids

Carbon dioxide : CO2 is a very attractive supercritical fluid for many reasons :

-- very cheap and abundant in pure form (food grade) worldwide ;

-- non flammable and not toxic ;

-- environment-friendly, as non polluting gas and as most of CO2 is manufactured

from waste streams (mainly fertilizer plants gaseous effluents) ;

-- critical temperature at 31°C, permitting operations at near-ambient temperature, avoiding product alteration ;

-- critical pressure at 74 bar, leading to “ acceptable ” operation pressure, generally between 100 and 350 bar.

However, carbon dioxide always behaves as a “ non-polar ” solvent that selectively dissolves the lipids that are water-insoluble compounds like vegetal oils, butter, fats, hydrocarbons....Carbon dioxide does not dissolve the hydrophilic compounds like sugars and proteins, and mineral species like salts, metals,...

Co-solvent : Organic solvent added to the main fluid (generally carbon dioxide) to modify its solvent power vis-à-vis “ polar ” molecules as the fluid itself is only able to dissolve “ non- polar ” molecules ; generally, the co-solvent is chosen between short-chain alcohols, esters or ketones. For obvious reasons, ethanol is preferred in many cases as it is abundant and cheap in pure forms (food grade, pharmacopoeia grade), not environment hazardous and not very toxic (as it is well known ! ).

Carbon dioxide is available either in commercial cylinders or spheres of limited volumes, or in bulk from tanks containing between 4 and 30 tonnes of liquefied gas at a pressure of 18 bar and at a temperature around –18°C. These tanks are directly fed from cryogenic trucks as shown on the picture below. The price is very sensitive to the quantity delivered as transportation is the main cost because carbon dioxide is available at very low price in various chemical plants (mainly ammonia plants).

Image | What is a Supercritical Fluid



what-is-supercritical-fluid
Supercritical CO2 Fluid Extractor | Oil Extract Using Infinity Supercritical CO2 Extraction System - Botanical CO2 Extraction System - Go to website

Search Engine Contact: greg@infinitysupercritical.com