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Vacuum evaporation - Video Learning - WizScience.com

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00:00:12.049
vacuum evaporation is the process of
00:00:14.690 00:00:14.700 causing the pressure in a liquid filled
00:00:16.400 00:00:16.410 container to be reduced below the vapor
00:00:18.710 00:00:18.720 pressure of the liquid causing the
00:00:20.510 00:00:20.520 liquid to evaporate at a lower
00:00:21.980 00:00:21.990 temperature than normal
00:00:23.390 00:00:23.400 although the process can be applied to
00:00:25.189 00:00:25.199 any type of liquid at any vapor pressure
00:00:27.349 00:00:27.359 it is generally used to describe the
00:00:29.330 00:00:29.340 boiling of water by lowering the
00:00:31.099 00:00:31.109 containers internal pressure below
00:00:33.080 00:00:33.090 standard atmospheric pressure and
00:00:34.970 00:00:34.980 causing the water to boil at room
00:00:37.160 00:00:37.170 temperature when the process is applied
00:00:40.400 00:00:40.410 to food and the water is evaporated and
00:00:42.709 00:00:42.719 removed the food can be stored for long
00:00:44.840 00:00:44.850 periods of time without spoiling it is
00:00:47.060 00:00:47.070 also used when boiling a substance at
00:00:49.160 00:00:49.170 normal temperatures would chemically
00:00:50.900 00:00:50.910 change the consistency of the product
00:00:52.790 00:00:52.800 such as egg whites coagulating when
00:00:54.979 00:00:54.989 attempting to dehydrate the albumin into
00:00:57.110 00:00:57.120 a powder this process was invented by
00:01:00.380 00:01:00.390 Henry NASA in 1866 of Nestle chocolate
00:01:04.280 00:01:04.290 fame although the shakers were already
00:01:06.440 00:01:06.450 using a vacuum pan earlier than that
00:01:09.100 00:01:09.110 this process is used industrially to
00:01:12.050 00:01:12.060 make such food products as evaporated
00:01:14.390 00:01:14.400 milk for milk chocolate and tomato paste
00:01:16.640 00:01:16.650 for ketchup in the sugar industry vacuum
00:01:19.940 00:01:19.950 evaporation is used in the
00:01:21.380 00:01:21.390 crystallization of sucrose solutions
00:01:23.560 00:01:23.570 traditionally this process was performed
00:01:26.179 00:01:26.189 in batch mode but nowadays continuous
00:01:28.640 00:01:28.650 vacuum pens are available vacuum
00:01:31.880 00:01:31.890 evaporators are used in a wide range of
00:01:33.800 00:01:33.810 industrial sectors to treat industrial
00:01:36.380 00:01:36.390 wastewater it represents a clean safe
00:01:39.050 00:01:39.060 and very versatile technology having low
00:01:41.300 00:01:41.310 management costs which in most cases
00:01:43.190 00:01:43.200 serves as a zero discharged treatment
00:01:45.980 00:01:45.990 system
00:01:53.370 00:01:53.380 thank you for watching for more
00:01:55.719 00:01:55.729 educational videos please subscribe to
00:01:58.480 00:01:58.490 with science on youtube or visit with
00:02:00.700 00:02:00.710 science com

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