FCCV标准-Terpene Resin, Synthetic合成萜烯树脂.pdf

IECC V
Monographs /Terpene Resin, Synthetic /471
alier I min of further separating, drain the lower phase into Terpene Resin, Natural
the separator S-2. Add a second 50-ML portion of isooctane
to the aqueous solution in S-2, and repeat the extraction proce
CAS:「9003-74-11
dure as previously described drawing off the lower, aqueous
phase into a third 500-ML separator(s-3). Add a third 50
ML portion of isooctane to the aqueous solution in S-3, and
repeat the extraction procedure as previously described, draw
DESCRIPTION
ing off and discarding the lower, aqueous phase
Terpene Resin, Natural, occurs as a pale yellow to yellow
Extract the solutions in S-1, -2, and-3 with two 100-ml solid, thermoplastic resin. It is a natural terpene occurring in
portions of a 0.5 solution of 25:75 ascorbic acid;ethanol
some coal seams
water. Shake each mixture for I min, allow the phases to
separate, and discard the lower, aqueous phases. Next, extract Function Masticatory substance in chewing gum base
each isooctane solution with two 100-ML portions of a 5%
solulion of ethanol in water, and discard the lower. aqueous
phases. Finally, wash each solution twice with 100 ML o
REQUIREMENTS
water, and discard the washes
Acid Value Less than 8
Lightly pack a standard-size chromatographic tube with Lead Not more than 3 m/k
100 g of anhydrous sodium sulfate, and wash the packed Melting Point Not less than 155
column with 75 ml of isooctane, discarding the wash. Filter
the isooctane solulion from S-1 through the column, and
TESTS
collect the filtrate in a 500-ML distillation flask. Wash S
with the isooctane solution contained in S-2, and then pour Acid Value Dissolve about 3 g of sample, accuratel
the solution onto the column, collecting the filtrate in
weighed in 100 ML of a mixture of 75 ml of toluene and
flask. Wash S-2 and S-1, successively, with the isooctane 36 ML of alcohol previously neutralized to phenolphthalein
solution ins-3 and filter the solution through the column as TS with sodium hydroxide. Add 25 ml of a saturated sodium
before. Wash S-3, S-2, and S-1, in that order and in tandem, chloride solution, 10 g in addition of sodium chloride, and a
with two successive 25-ml portions of isooctane, and pass few drops of phenolphthalein TS, and titrate with 0.1 N alco
the washings individually through the column and into the holic potassium hydroxide to the first pink color that persists
flask. Let the column drain completely
lor al least 30 s. Calculate the acid value by the formula
Add 2 ML of hexadecane and 2 boiling stones to the 500-
56.1××N/F、
ML distilation flask containing the combined isooctane ex-
tracts and attach the flask to a suitable vacuum distillation in which V is the volume, in milliliters. of.1 N alcoholic
assembly. Evacuate the assembly to about one-third atmo-
potassium hydroxide, and N is the normality, respectively, of
then immerse the (lask in a steam bath and distill the the alcoholic polassium hydroxide solution; and W is the
solvent. When isooctane stops dripping into the receiver, turn weight, in grams, of the sample
OIT the vacuum. wash down the walls of the Flask with S ml Lead Prepare a Sample Solution as directed under Sample
of isooctane added through the top of the distillation head<