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Method for reducing resin pumping load in PVAc conveying process

A technology of conveying process and resin pump, which is applied in the field of improvement of the solution at the pump port of the polymerized two-pot resin pump, can solve the problems of increasing the load of the resin pump and the time required for dissolving, and achieves the reduction of the conveying load, the fast dissolving rate and the prolongation of the service life. Effect

Inactive Publication Date: 2016-12-07
ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it takes time to dissolve. Adding cold methanol to the resin does not achieve the purpose of dissolution immediately, and the load of the resin pump increases instead.

Method used

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  • Method for reducing resin pumping load in PVAc conveying process

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Embodiment Construction

[0009] In the embodiment of the present invention, the distillate from the single removal tower is used as the pump port solution (the mass ratio of methanol to vinyl acetate is 1.35:1), no need to add new equipment, only a new pipeline and a valve are needed. There are three main advantages of using the single tower distillate as the pump port solution:

[0010] 1. The methanol content of the distillate is just within the range of 10%-90% of the methanol mass percentage required for the use of the pump port solution.

[0011] 2. After the temperature of the distillate is exchanged by the condenser of the single removal tower, the temperature just reaches the range of 20-50°C required by the present invention.

[0012] 3. The solution at the pump port does not need to be prepared, because the preparation of the pump port solution requires additional preparation tanks, mixers, centrifugal pumps and other equipment, which increases the cost. To use the distillate from the single...

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Abstract

The invention discloses a method for reducing resin pumping load in the PVAc conveying process. The methanol and vinyl acetate mixed solution of a certain temperature serves as a pump inlet solution. The method uses a brand new solution system to replace an original pump inlet cold methanol so as to improve the liquidity of polyvinyl acetate in a pipeline, reduce the delivery difficulty and the load of a resin pump and ensure production safety.

Description

1. Technical field [0001] The invention relates to a method for reducing the load of a resin pump in the PVAc conveying process, which is an improvement to the solution at the pump port of the resin pump in the second polymerization kettle in the production of polyvinyl acetate. 2. Background technology [0002] One of the main uses of polyvinyl acetate (PVAc) is alcoholysis to prepare polyvinyl alcohol (PVA) raw material. PVA is a water-soluble polymer with a wide range of uses, and it is in the form of white or slightly yellow powder. PVAc is prepared by polymerization of monomer vinyl acetate (VAc) by free radicals in a solvent. The solvents include methanol, benzene, toluene, chlorobenzene, acetone, ethyl acetate, etc. Methanol is commonly used as a solvent in industry. Due to the high viscosity of the produced PVAc, in order to facilitate transportation and reduce the load of the resin pump, it is necessary to add a solvent to dissolve the PVAc at the inlet of the resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/09C08L31/04
CPCC08J3/095C08J2331/04
Inventor 潘晓明徐凌云潘友超查从元朱宝华刘香兰
Owner ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD