How to measure the content of organic solvent extract?
Organic extractives (Organic Extractives, OE) refer to the components in pulp or paper that can be extracted by organic solvents (such as ether, acetone, etc.), mainly including fats, resins, oils, resin acids, sugars, proteins and other organic substances. The quality of pulp or paper can be assessed by measuring the content of organic solvent extractables.
The determination method of organic solvent extract content is as follows:
principle
Extract a certain amount of pulp or paper with an organic solvent, after drying, weigh and calculate the mass of the organic solvent extract. The specific operation steps are as follows:
Materials and Reagents
(1) Diethyl ether or acetone: the purity is greater than 99.5%;
(2) Silica gel: used for extract drying.
instrument
(1) Balance: measuring range 0.001g;
(2) Constant temperature bath: the controllable temperature is between 25-30°C.
Steps
Take a certain amount of pulp or paper sample (usually 5-10g) and put it into the extraction bottle.
Add a certain amount of ether or acetone to the bottle, and seal the bottle stopper.
Vibration extraction is carried out with a constant temperature tank, and the time is generally 16-18 hours.
Filter the solution in the bottle, collect the filtrate in a clean container, and evaporate the solvent to dry the extract completely.
The dried extract was placed in a thermostat and dried at 105°C until constant weight.
Weigh the mass of the dried extract.
Calculate the content of organic solvent extract: OE content (%) = extract mass/sample mass × 100%.
NBCHAO reminds you: Different pulp and paper samples have different extraction efficiencies for organic solvents, so it is necessary to select the appropriate organic solvent and extraction time according to the specific situation to ensure the accuracy of the measurement results.
