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Method for continuously drying hexamethylol melamine

A technology of hexamethylolmelamine and methylolmelamine, which is applied in the field of continuous drying of hexamethylolmelamine, can solve the problems of low drying efficiency, affecting the retention rate of product methylolation degree, polycondensation of hexamethylolmelamine materials, etc. problems, to achieve the effect of stable product quality, shortened drying time, and good technical effects

Active Publication Date: 2021-03-23
JIANGSU CHANGNENG ENERGY SAVING NEW MATERIALS SCI & TECH +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that in the prior art, when the belt-type vacuum dryer uses steam heating, the temperature is too high to cause the polycondensation of the hexamethylolmelamine material, thereby affecting the retention rate of the product methylolation degree, and the existing To solve the problem of low drying efficiency in the technology, a method for continuously drying hexamethylol melamine is provided, which has the advantages of improving the retention rate of product methylolation degree and drying efficiency

Method used

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  • Method for continuously drying hexamethylol melamine

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Experimental program
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Effect test

Embodiment 1

[0020] Continuously divert the undried hexamethylolmelamine paste material into the belt vacuum dryer through six screw pumps and evenly distribute the material on the drying belt. The paste material passes through the heating zone 1 in sequence, and the hot water The temperature is 75°C, dried for 50 minutes to obtain material I, and the material I passes through heating zone 2, where the steam temperature is 110°C, and dried for 50 minutes to obtain material II, and then passes through heating zone 3, wherein the temperature of hot water is 45°C, dried for 50 minutes and then pulverized Hexamethylolmelamine powder III was obtained, and the vacuum degree in the dryer was -0.099Mpa during the whole drying process.

Embodiment 2 to 4

[0022] Embodiment 2 to Embodiment 4 are carried out according to the various steps of Embodiment 1. The only difference is that the index parameters of the paste material, the temperature of the heating medium and the heating time are different. See Table 1 for details. The prepared hexamethylol The quality inspection data of melamine powder are shown in Table 4.

[0023] The reaction parameter of table 1 embodiment 1 to embodiment 4

[0024] Process parameters Example 1 Example 2 Example 3 Example 4 Heating zone 1 medium hot water hot water hot water hot water Medium temperature in heating zone 1 (°C) 75 60 90 70 Drying time of heating zone 1 (min) 50 60 45 70 Heat zone 2 medium steam steam steam steam Medium temperature in heating zone 2 (°C) 110 100 120 105 Drying time of heating zone 2 (min) 50 60 45 70 Heating Zone 3 Medium hot water hot water hot water hot water Heating zone ...

Embodiment 5 to Embodiment 8

[0026] Embodiment 5 to Embodiment 8 are carried out according to the various steps of Embodiment 1. The only difference is the index parameter of the paste material, the temperature of the heating medium and the heating time. See Table 2 for details. The prepared hexamethylol The quality inspection data of melamine powder are shown in Table 4.

[0027] The reaction parameter of table 2 embodiment 5 to embodiment 8

[0028] Process parameters Example 5 Example 6 Example 7 Example 8 Heating zone 1 medium hot water hot water hot water hot water Medium temperature in heating zone 1 (°C) 80 75 85 65 Drying time of heating zone 1 (min) 40 55 60 65 Heat zone 2 medium steam steam steam steam Medium temperature in heating zone 2 (°C) 110 115 110 105 Drying time of heating zone 2 (min) 40 55 60 65 Heating Zone 3 Medium hot water hot water hot water hot water Heating zone 3 medium temperature...

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Abstract

The invention relates to a method for continuously drying hexamethylol melamine. The problem that the retention rate of the hydroxymethylation degree of a product is influenced due to polycondensationof a hexamethylol melamine material caused by too high temperature when a belt type vacuum drier is heated by steam in the prior art is mainly solved. According to the technical solution, the novel method for continuously drying the hexamethylol melamine comprises the following steps of conducting continuous flow dividing of a hexamethylol melamine paste material into a belt type vacuum dryer through a screw pump, and uniformly distributing the material on a drying belt, and enabling the material to sequentially pass through the hot water heating area, the steam heating area and the hot waterheating area in a drying machine and then to be ground into powder to obtain the dried hexamethylol melamine powder, so that the problems are better solved, and the method can be applied to the continuous industrial production of hexamethylol melamine.

Description

technical field [0001] The invention relates to a method for continuously drying hexamethylol melamine. Background technique [0002] In the industrial production of hexamethylolmelamine, conventional drying methods such as airflow drying or vacuum paddle drying are mostly used. Airflow drying requires a large energy consumption, waste water and waste gas are difficult to recycle, and cause great environmental pollution. At the same time, airflow Uneven temperature may lead to unstable product quality; when the vacuum paddle is drying, the heat source directly contacts the material, and the effective contact surface between the material and the heat source in the dryer is small, and it is easy to cause condensation and deterioration of the material at high temperature, and the drying time is longer when the temperature is lower. Long, low drying efficiency and high energy consumption. The vacuum belt dryer is a contact vacuum drying equipment in the form of continuous feedi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B17/04F26B25/00F26B25/22F26B23/00F26B21/00
CPCF26B17/04F26B25/002F26B25/22F26B23/00F26B21/005
Inventor 陈玉范勤勇韩国飞朱洪峰赵俊飞
Owner JIANGSU CHANGNENG ENERGY SAVING NEW MATERIALS SCI & TECH
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