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Devolatilization device and SAN (Styrene Acrylonitrile) resin devolatilization process

A devolatilization device and devolatilization technology, which is applied in feeding devices, chemical/physical/physical-chemical processes, chemical instruments and methods, etc., can solve problems such as excessive heating of materials, resin appearance defects, etc., and achieve enhanced melt back-mixing , The effect of promoting the surface renewal of the liquid film and enhancing the devolatilization efficiency

Active Publication Date: 2021-08-27
WANHUA CHEM (SICHUAN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This often results in the material being overheated, prone to defects in the appearance of the resin

Method used

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  • Devolatilization device and SAN (Styrene Acrylonitrile) resin devolatilization process
  • Devolatilization device and SAN (Styrene Acrylonitrile) resin devolatilization process
  • Devolatilization device and SAN (Styrene Acrylonitrile) resin devolatilization process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] In this embodiment, the flow rate of the SAN solution entering the devolatilization section is 200kg / h, the solid content is 60%, and the temperature is 150°C. The primary preheater is heated by saturated steam at 185°C, the temperature of the SAN solution at the outlet of the primary preheater is 180°C, the operating temperature of the primary devolatilizer is 180°C, and the operating pressure is 37kPa(A). Open the front valve of the vacuum pump every 5 minutes. After ventilating for 1 min, close the valve and cycle.

[0061] The material distribution pipe of the first-stage devolatilizer is provided with 30 openings, the size of the openings gradually increases from 6mm to 30mm, and the spacing between the holes is 10mm. A guide wire with barbs is installed vertically below the opening of the material distribution pipe. The length of the guide wire is 140mm, and the diameter of each guide wire is 0.3 times the diameter of the opening connected to it. There are multip...

Embodiment 2

[0065] In this embodiment, the flow rate of the SAN solution entering the devolatilization section is 300kg / h, the concentration is 80%, and the temperature is 120°C. The primary preheater is heated by 180°C saturated steam, and the temperature of the SAN solution at the outlet of the primary preheater is 174°C. The operating temperature of the primary devolatilization tank is 150°C and the operating pressure is 30kPa(A). The valve in front of the vacuum pump is opened every 4 minutes, and the valve is closed after 1 minute of ventilation, and the operation is cyclic.

[0066] The material distribution pipe of the first-stage devolatilizer is provided with 30 openings, the size of the openings gradually increases from 10mm to 45mm, and the spacing between the holes is 7mm. The guide wire with barbs is vertically distributed under the opening of the material distribution pipe, and the length of the guide wire is 180mm. The diameter of each guide wire is 0.2 times the diameter ...

Embodiment 3

[0070] In this embodiment, the flow rate of the SAN solution entering the devolatilization section is 500kg / h, the concentration is 60%, and the temperature is 140°C. The primary preheater is heated by 190°C saturated steam, the temperature of the SAN solution at the outlet of the primary preheater is 183°C, the operating temperature of the primary devolatilizer is 140°C, and the operating pressure is 35kPa(A). Open the front valve of the vacuum pump every 4 minutes. After ventilating for 1 min, close the valve and cycle.

[0071] The material distribution pipe of the first-stage devolatilizer is provided with 30 openings, the size of the openings gradually increases from 7mm to 35mm, and the hole spacing is 8mm. A guide wire with barbs is installed vertically below the opening of the material distribution pipe. The length of the guide wire is 260 mm, and the diameter of each guide wire is 0.4 times the diameter of the hole connected to it. There are multiple groups of barbs ...

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Abstract

The invention discloses a devolatilization device and an SAN resin devolatilization process. A material distributor is arranged at a material inlet of the devolatilization device, a plurality of holes are formed in the material distributor, flow guide wires are arranged at the holes, and barbs are arranged on the flow guide wires. According to the devolatilization process, the two-stage series devolatilization device is adopted for removing volatile components, the devolatilization device is adopted for devolatilization, the film forming property of the material is good, the volatile component content of the obtained material is small, and the devolatilization efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of polymer material production and processing, and relates to a resin devolatilization production technology, in particular to a devolatilization device and a SAN resin devolatilization process. Background technique [0002] SAN resin is a high molecular polymer copolymerized by styrene and acrylonitrile. It has good transparency, chemical resistance, mechanical properties and permeability resistance. It is mainly used in transparent structural materials or as a blend of polymer alloys. point. [0003] The synthesis of SAN resin generally adopts continuous bulk polymerization process. It is usually necessary to add toluene or ethylbenzene solvent accounting for 5-20wt% of the reaction solution, react at a specific temperature to a conversion rate of 70-80%, and then transport the slurry with a solid content of 55-70% to the back-stage devolatilizer for devolatilization Remove unreacted monomers and solvent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/00B01J4/00C08F6/28C08L25/12
CPCB01J19/00B01J4/001C08F6/28B01J2204/002C08L25/12
Inventor 刘波孙一峰周兵潘晓艺冯兴磊于天勇黎源
Owner WANHUA CHEM (SICHUAN) CO LTD
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