Centrifugal film evaporator and operating method thereof
An evaporation device and thin film technology, applied in separation methods, evaporation, chemical instruments and methods, etc., can solve the problems of unrecorded, difficult to suppress depolymerization optical isomerization, etc., and achieve the effect of high yield
Inactive Publication Date: 2012-09-12
HITACHI LTD
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Problems solved by technology
However, it does not describe how to use a thin film evaporation device is more appropriate from the viewpoint of suppressing optical isomerization.
Therefore, it is difficult to suppress optical isomerization at the time of depolymerization
Method used
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no. 1 example
[0055] figure 1 It is a diagram of the synthesis process of polylactic acid in this example. The raw material monomer (lactic acid) 100 consists of a concentration step 101, a concentrate condensation step 102, an oligomer depolymerization step 103, a cyclic condensate purification step 104, a ring-opening polymerization step 105, and a residual monomer treatment step 106. The polymer drying step 107 is constituted. These steps may be omitted depending on the characteristics of the polymer and the necessity of the process, or other steps may be added in the middle. In addition, the process of treating the remaining monomers can be selected from the following methods, namely, the release and removal of the monomers in a reduced pressure environment, and the solid-phase polymerization at a temperature equal to or lower than the melting point. Among these processes, the centrifugal thin film evaporator of this embodiment is suitable for the depolymerization process of oligomers. ...
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The subject of the invention is to obtain cyclic condensates of optically-isomerized lactide with less pyrolysis, and to obtain polymers of polylactic acid with high quality. In a centrifugal thin film evaporation device, a supply hole (42) of raw material liquid is provided at one end side of a reaction trough (38), a vent hole (43) is provided on top of main body of another end side; the raw material liquid deposited at bottom of the main body of the reaction trough (38) is stirred up via a lamina (39), a liquid film is formed via centrifugal force along the inner wall face of the main bodyof the reaction trough (38); the leakage from the liquid film is inhibited by a dyke portion (40) at the rear part of the lamina (39); thickness of the liquid film is measured by a liquid film thickness meter, supply amount of the raw material liquid is controlled to form the set liquid film thickness; the steam from the liquid film is exhausted from the vent hole (43) via inner side of the dyke portion (40), the central part space of the reaction trough (38).
Description
Technical field [0001] The invention relates to a centrifugal thin-film evaporator and its operating method for chemically reacting raw material liquids, generating product vapors and recovering them. Background technique [0002] Centrifugal thin-film evaporators generally increase the evaporation area and thermal conductivity through thin film, so they are suitable for high concentration processes in a short time. Especially suitable for temperature-sensitive products such as concentrated fruit juice, meat, fish and shellfish concentrate foods. In addition, it is also suitable for condensing and recovering the generated steam when the flavor components of tea and coffee become products. In the latter case, by generating as much steam as possible from the raw material liquid, the raw material yield of the product can be improved. Especially, when most of the raw material liquid can form product vapor, it is very important to minimize the amount of residue (concentrated liquid)...
Claims
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IPC IPC(8): B01D1/22
Inventor 松尾俊明上川将行冈宪一郎冈本成恭加治屋隆司
Owner HITACHI LTD