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Polyvinyl alcohol two-stage drying technology

A polyvinyl alcohol and drying process technology, applied in the field of polyvinyl alcohol drying, can solve the problems of difficult to guarantee product quality, product overheating denaturation, large equipment and other problems, and achieve the effects of reducing the pulverization rate, preventing overheating discoloration, and reducing drying

Inactive Publication Date: 2009-06-10
TIANHUA INST OF CHEM MACHINERY & AUTOMATION
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing PVA drying technology, the polyvinyl alcohol (PVA) drying equipment mostly adopts the rake dryer introduced in the 1970s. The main problems are: ①The equipment is huge, the thermal efficiency is low, and the violent movement of the stirring rake teeth causes the material to be damaged. Severe, high pulverization rate; ②The product requires that the volatile content in PVA is ≤5%, and the content of organic solvent methanol and methyl acetate should be as small as possible
However, the traditional rake-type primary drying process is difficult to meet the above conditions, and its process is easy to overheat and denature the product, and the product quality is difficult to guarantee

Method used

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Embodiment Construction

[0018] The two-stage paddle drying process of polyvinyl alcohol (PVA) is described in further detail below in conjunction with the accompanying drawings:

[0019] The PVA wet material enters the primary paddle machine 1 through the star-shaped feeding valve 7, and performs primary drying in the paddle dryer 1. There are two drying methods for the primary drying according to the PVA grade and requirements:

[0020] (1) direct drying method

[0021] When the dried PVA material is not easy to stick to the wall, the primary paddle dryer 1 directly dries the PVA material to reduce the moisture content to the process requirement, and then enters the secondary paddle dryer 2 through the rectangular bellows 3 .

[0022] (2) return material drying method

[0023] When the dried PVA has special physical properties and is easy to stick to the wall, the first-stage drying is carried out in the first-stage paddle dryer 1 by the method of returning materials. The wet material entering the...

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Abstract

A two-stage drying process for polyvinyl alcohol (PVC) includes such steps as drying it in the stage-one paddle drier, delivering it into stage-two paddle driver via rectangular corrugated pipe, drying it again and discharging. It can prevent the color of PVC from changing due to overheat.

Description

technical field [0001] The invention relates to polyvinyl alcohol (PVA) drying technology, which is a two-stage paddle combined drying technology. Background technique [0002] During the processing of polyvinyl alcohol (PVA) products, the PVA components after granulation include: PVA, methanol, methyl acetate, water, sodium acetate, etc., and organic solvents such as methanol, methyl acetate and a small amount of water are dried After the part is removed, it becomes a PVA product. [0003] In the existing PVA drying technology, the polyvinyl alcohol (PVA) drying equipment mostly adopts the rake dryer introduced in the 1970s. The main problems are: ①The equipment is huge, the thermal efficiency is low, and the violent movement of the stirring rake teeth causes the material to be damaged. Severe, high pulverization rate; ②The product requires that the volatile content in PVA is ≤5%, and the content of organic solvent methanol and methyl acetate should be as small as possible...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B13/06
Inventor 孙中心张毅赵旭王毅
Owner TIANHUA INST OF CHEM MACHINERY & AUTOMATION