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Circulating drier and drying method

A drying method and technology of a drying device, which are applied in the field of circulating drying of drying objects, and can solve the problems of large gas volume, increased device construction costs, and increased costs.

Inactive Publication Date: 2009-08-26
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Even if it is a closed cycle method, that is, a circulating spray drying method, when it is necessary to use a device for processing the volatile components in the circulating gas, the cost of the device will also increase due to the large amount of gas when processing all the gas.
Furthermore, when the circulating gas is made to have a low oxygen concentration, the cost of the inert gas or the construction cost of the inert gas generator increases when the gas volume is large.
[0014] In addition, even when superheated steam is used and the circulating drying method is adopted, the concentration of volatile components must be controlled below a certain value. For large-scale processing, there is also concern about the increase in control of the concentration of volatile components and anti-condensation measures. big cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] use figure 2 The circulating drying device shown is used to dry the polymer emulsion A and recover the polymer powder.

[0083] figure 2 The circulating drying device is in figure 1 The following equipment is added to the circulating drying device of the company: a heat exchanger for heat exchange between the combustion gas (processing gas) flowing in the supply line 26 and a part of the circulating gas flowing in the heat exchange line described later. 31, a preliminary heater 32 for removing the associated heavy mist contained in the circulating gas discharged from the condenser 15 and preheating the circulating gas, and cooling the cooling medium (water) for cooling the cooling water used for cooling the condenser 15 The cooling tower 33 and the heat exchanger 34 for cooling water exchange heat between the cooling water for the condenser 15 and the cooling medium from the subcooling tower.

[0084] In addition, in figure 2 In the circulating drying device of t...

Embodiment 2

[0104] use figure 2 The circulating drying device shown dries the polymer emulsion B to recover the polymer powder.

[0105] polymer emulsion B

[0106] In a polybutadiene emulsion of 218.75 parts by mass (solid content: 32 mass%), 13.2 parts by mass of methyl methacrylate, 14.4 parts by mass of styrene, and 2.4 parts by mass of ethyl acrylate were graft-polymerized to obtain a polymer Polymer Emulsion B (70% polybutadiene content in grafted polymer). The residual monomers methyl methacrylate and styrene in this emulsion were 1000 ppm and 1000 ppm. The solid content rate (mass %) was 40%. The polymer emulsion B is sent to the dryer 12 for drying at a flow rate of 82.5 kg / hour, and the polymer in the emulsion is recovered. Next, specific operating conditions will be described.

[0107] The circulating gas (dry gas 1563 kg / hour, water vapor 76 kg / hour) is heated to 180° C. by heater 11 and introduced into dryer 12 . The polymer emulsion B was sprayed into the dryer 12 at ...

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Abstract

The present invention relates to a circulation drying device and a drying method for drying an object to be dried in a drier by using the gas heated in the heater while circulating the gas between the heater and the drier. The concentration of volatile components and the concentration of oxygen in the circulation system can be reduced at low cost, and the pollution to the environment due to exhaust gas can be reduced. Circulation method in which the object to be dried including the volatile components in the dryer (12) is dried using the gas heated in the heater (11) while circulating the gas between the heater (11) and the dryer (12) The drying device has: a branch pipeline (25) that draws out part of the gas circulating between the heater (11) and the dryer (12), and a gas treatment device that decomposes or recovers volatile components contained in the drawn gas (16), the supply line (26) that returns the gas discharged from the gas treatment device (16) to the gas circulating between the heater (11) and the dryer (12).

Description

technical field [0001] The present invention relates to a circulating drying device and a circulating drying method for drying an object to be dried in the dryer using the gas heated in the heater while circulating gas between the heater and the dryer. More specifically, The present invention relates to a circulating drying device and a circulating drying method for drying an object to be dried containing volatile components at low cost, safely and without increasing environmental burden. Background technique [0002] Conventionally, as methods for drying objects such as polymer emulsions using heated gas, there are known an open cycle method and a closed cycle method (circulation method). [0003] The open cycle method refers to a method in which heating gas used for drying an object to be dried is released into the atmosphere. Therefore, in the open cycle system, energy loss is large due to the discharge of high-temperature gas into the atmosphere. In addition, since vol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B3/12F26B21/04F26B3/04F26B9/06F26B21/06F26B23/10
Inventor 白水大辅川部贞治鸟谷明弘
Owner MITSUBISHI CHEM CORP