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Industrial continuous evaporation apparatus

An evaporation device, an industrial technology, applied in the direction of evaporation, separation methods, fixed conduit components, etc., can solve the problems of retention, no reduction of distribution pipes, etc., and achieve the effect of small uneven molecular weight

Active Publication Date: 2007-11-28
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, since the high-viscosity material supplied from the high-viscosity material supply port (7) stays in the "dead space" between the porous plate (3) and the inner side wall surface of the hollow body for a long time, the above-mentioned problems inevitably arise.
In addition, even in the recently proposed Patent Document 8, there is no way to reduce the "dead space" in the distribution pipe 3 (Fig. 2) and the supply area (Fig. 3a) to the perforated plate at all.

Method used

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  • Industrial continuous evaporation apparatus
  • Industrial continuous evaporation apparatus
  • Industrial continuous evaporation apparatus

Examples

Experimental program
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Effect test

Embodiment 1

[0132] An industrial evaporation device with a disk-shaped flow path control member 20 and a guider 4 with a thickness of about 2 cm shown in Fig. 2 and Fig. 3 . The disk-shaped flow path control member 20 is hung and fixed from above at a distance of about 8 cm from the upper inner wall surface 23 of the liquid supply region 3 . In addition, the distance between the inner side wall surface 22 of the liquid supply region 3 and the flow path control member 20 is about 9 cm, and the distance between the porous plate 2 and the flow path control member 20 is about 8 cm. In addition, the peripheral portion of the disk-shaped flow path control member 20 is finished into a semicircle with a radius of about 1 cm in vertical section, and it is designed so that liquid does not stagnate in the peripheral portion. In addition, the cross-section of the connection portion between the inner side wall surface 23 of the liquid supply region and the perforated plate 2 is finished into a concave...

reference example 1

[0134] An aromatic polycarbonate was produced using the industrial evaporator of Example 1 as a polymerization reactor for condensation-based polymers. A molten prepolymer of aromatic polycarbonate (number-average molecular weight Mn: 4,000) produced from bisphenol A and diphenyl carbonate (the molar ratio relative to bisphenol A is 1.05) and maintained at 260°C is supplied by The pump supplies continuously from the supply port 1 into the supply area 3 . While flowing from the peripheral portion of the perforated plate 2 to the central portion, the molten prepolymer continuously supplied from the holes of the perforated plate to the evaporation region 5 (polymerization reaction region) proceeds polymerization reaction while flowing down the guide 4 . The polymerization reaction zone was maintained at 80 Pa through the vaporized product outlet 6 . The produced aromatic polycarbonate entering the bottom 11 of the polymerization reactor from the lower part of the guide 4 was con...

Embodiment 2

[0138] Two sets of industrial evaporators shown in Figure 2 and Figure 3 with flow path control components 20 and guides are arranged in series to polymerize polycondensation polymers. The aromatic polycarbonate was produced using this polymerization facility (the first polymerization reactor and the second polymerization reactor). The materials of these evaporation devices are all stainless steel. The discharge pump 8 of each evaporator is a gear pump. The guider contact flow-down type 1st polymerization reactor has cylindrical side casing 10 and conical bottom casing 11, and L=950cm, h=850cm, D=400cm, d=20cm, C=150 degrees, S= 750m 2 , A=12.56m 2 , A / B=400, D / d=20, L / D=2.375, r=0.3cm, N=about 500, T / Q=about 1300. The distance K between the guider closest to the inner wall of the evaporation area and the inner wall is about 14 cm. In addition, the diameter of the cross section of the flow path control member 20 is slightly smaller, but has the same shape as described in ...

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Abstract

The problem to be solved by the present invention is to disclose a specific evaporation apparatus, wherein a liquid containing a substance having a boiling point lower than that of said liquid is allowed to fall along the outer surface of a guide and said substance having a lower boiling point is evaporated during the above fall, wherein the apparatus has such a industrial scale that the amount of said liquid to be subjected to the evaporation treatment is 1 ton or more per hour, wherein the apparatus can be operated stably for a long period of time, and wherein the apparatus is free from the problems originated from the change of properties of a product due to the long term residence of a part of said liquid. The present invention has solved the above problem, and has found that a concentrated liquid, a condensation polymer or a thermoplastic polymer having high quality or a high purity can be produced with ease.

Description

technical field [0001] The present invention relates to a new industrial evaporation device. More specifically, it relates to a device for causing a liquid containing a substance having a lower boiling point than the liquid to flow downward along the outer surface of a guide which itself has no heating source, during which the substance having a lower boiling point is evaporated. Background technique [0002] Various devices are known as industrial evaporators for evaporating and removing volatile components and / or low boiling point components in a liquid and concentrating the liquid. For example, in the 6th edition of Handbook of Chemical Engineering (refer to Non-Patent Document 1: 6th Edition, Handbook of Chemical Engineering, pages 403-405, edited by the Society of Chemical Engineering, 1999), it is described that the submerged combustion method and the natural circulation type immersion tube Type, natural circulation horizontal tube type, vertical short tube type, vert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G85/00C08G63/90B01D1/00C08G64/30C08F6/28C08G69/46
CPCC08G63/785B01D1/22C08F6/003C08F6/005C08G64/205F28D3/00B01D1/00C08F6/28C08G63/90C08G85/00
Inventor 福冈伸典八谷广志松崎一彦
Owner ASAHI KASEI KK
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