| 摘要 |
<p>Decaffeinated coffee prod. is obtd. by (a) contacting an aq. caffeine-contg. roasted coffee extract (1) with a halogenated caffeine solvent (2) in a liq./liq. extn. column at wt. ratio (2):(1) between 1:1 and 10:1 at 26.7-82.2 deg. C, to transfer at least 90% of the caffeine in (1) to (2); a minor amt. of non-caffeine roasted coffee solids (3) is also transferred to (2); (b) sepg. the aq. phase (1a) from the solvent phase (2a); (c) contacting (2a) with water (4) in a liq./liq. extn. column at wt. ratio (4):(2a) from 0.25:1 to 3:1 at 5-43.3 deg. C, to transfer at least 70% of the (3) in (2a) to (4), while retaining at least 90% of the caffeine in (2a); (d) sepg. the aq. phase (4a) from the solvent phase (2b); (e) combining aq. phase (4a) with aq. phase (1a) and (f) removing entrained solvent from (4a) and (1a) either before or after combining, to give residual solvent concn. less than 10 ppm.</p> |
