Method for continuous drying of hexamethylolmelamine

A technology of hexamethylolmelamine and hexamethylolmelamine paste, which is applied in the field of continuous drying of hexamethylolmelamine, can solve the problem of low drying efficiency, polycondensation of hexamethylolmelamine materials, and affecting the degree of methylolation of products Retention rate and other issues, to achieve stable product quality, good technical effect, and shorten the drying time

Active Publication Date: 2022-06-21
JIANGSU CHANGNENG ENERGY SAVING NEW MATERIALS SCI & TECH +1
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  • Abstract
  • Description
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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 continuous drying of hexamethylolmelamine

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Experimental program
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Effect test

Embodiment 1

[0020] Continuously divert the undried hexamethylolmelamine paste material through six screw pumps into the belt vacuum dryer and evenly distribute the material on the drying belt. The temperature is 75°C, drying for 50min obtains material I, the material I passes through heating zone 2, wherein the steam temperature is 110°C, drying for 50min obtains material II, and then passes through heating zone 3, wherein the hot water temperature is 45°C, and the powder is ground after drying for 50min. The 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] Example 2 to Example 4 were carried out according to the steps of Example 1, and the only difference was the index parameter of the paste material, the temperature of the heating medium and the heating time. For details, see Table 1. The prepared hexamethylol The quality inspection data of melamine powder are shown in Table 4.

[0023] Table 1 Reaction parameters of Example 1 to Example 4

[0024] Process parameters Example 1 Example 2 Example 3 Example 4 Heating zone 1 medium hot water hot water hot water hot water Heating zone 1 medium temperature (℃) 75 60 90 70 Drying time of heating zone 1 (min) 50 60 45 70 Heating zone 2 medium steam steam steam steam Heating zone 2 medium temperature (℃) 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 3 medium temperature (℃) 45 30 60 40 ...

Embodiment 5 to Embodiment 8

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

[0027] Table 2 Reaction parameters of Example 5 to Example 8

[0028] Process parameters Example 5 Example 6 Example 7 Example 8 Heating zone 1 medium hot water hot water hot water hot water Heating zone 1 medium temperature (℃) 80 75 85 65 Drying time of heating zone 1 (min) 40 55 60 65 Heating zone 2 medium steam steam steam steam Heating zone 2 medium temperature (℃) 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 (℃) 40 50 50 55 ...

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Abstract

The invention relates to a method for continuously drying hexamethylol melamine, which mainly solves the problem that in the prior art, when the belt vacuum dryer uses steam to heat, the hexamethylol melamine material is polycondensed due to too high temperature, thereby affecting the product methylol melamine. The question of retention rate. The present invention adopts a new method for continuously drying hexamethylolmelamine, comprising: continuously shunting the hexamethylolmelamine pasty material into a belt vacuum dryer through a screw pump and evenly distributing the material on the drying belt In the drying machine, the material passes through the hot water heating zone, the steam heating zone and the hot water heating zone in turn, and then the technical scheme of grinding to obtain dry hexamethylolmelamine powder solves this problem well, and can be used for hexahydroxymethylmelamine powder. Continuous industrial production of methylmelamine.

Description

technical field [0001] The invention relates to a method for continuous drying of hexamethylol melamine. Background technique [0002] In the industrial production of hexamethylene melamine, conventional drying methods such as air-flow drying or vacuum paddle drying are mostly used. Air-flow drying requires large energy consumption, and it is difficult to recover waste water and waste gas, which causes great environmental pollution. Uneven temperature may lead to unstable product quality; when the vacuum paddle is dried, 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 polycondensation and deterioration of the material at high temperature, and the drying time is longer when the temperature is low. long, low drying efficiency and high energy consumption. The vacuum belt dryer is a contact vacuum drying equipment in the form of continuous feeding and contin...

Claims

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Application Information

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