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Method for reducing viscosity of residue on evaporation from distillation recovery of polymerization solvent NMP for producing PPTA

A technology of evaporation residue and distillation recovery, which is applied in the field of viscosity reduction and modification, can solve the problems of poor feasibility and achieve the effect of reducing viscosity

Active Publication Date: 2016-02-17
SINOPEC YIZHENG CHEM FIBER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process will also face the difficulty of forming highly viscous slurry complexes between NMP and salts, and its practical application is expected to be poor

Method used

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  • Method for reducing viscosity of residue on evaporation from distillation recovery of polymerization solvent NMP for producing PPTA

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: according to the technological process of the present invention, set up relevant test equipment, wash and separate powder to PPTA polymerization mixture, the mother liquor after separation is passed through Ca(OH) 2 After neutralization, take 50kg of mother liquor to be treated, add 50g each of copper sulfate and calcium borate to it, stir evenly, place in an evaporator to heat and evaporate, and control the evaporation temperature to dryness to obtain a cake-like residue. Then put 150°C steam into the vacuum drum dryer to heat the drum; put 210°C heat conduction oil into the tray jacket and cloth scraper for heating, and after the system runs stably at idle, continuously add materials into the tray for drying Evaporated to dryness. Control the rotational speed of the drum to be 6 rpm, the surface temperature of the drum to be 106° C., and the feed rate to be 0.57 kg / min. The separated NMP crude product enters the solvent recovery system, which includes a...

Embodiment 2

[0044] Embodiment 2: according to the technical process of the present invention, set up relevant test equipment, wash the PPTA polymerization mixture and separate the powder, after the separated mother liquor is neutralized, take 50kg of the mother liquor to be treated, add copper sulfate 50g, calcium borate to it After 100 g, stir evenly, place in an evaporator and heat to evaporate, and control the evaporation temperature to dryness to obtain a cake-like residue. Then put 150°C steam into the vacuum drum dryer to heat the drum; put 210°C heat conduction oil into the tray jacket and cloth scraper for heating, and after the system runs stably at idle, continuously add materials into the tray for drying Evaporated to dryness. Control the rotational speed of the drum to be 6 rpm, the surface temperature of the drum to be 106° C., and the feed rate to be 0.57 kg / min. The separated NMP crude product enters the solvent recovery system, which includes a two-stage thin film evapora...

Embodiment 3

[0046] Embodiment 3: according to the technical process of the present invention, set up relevant test equipment, wash the PPTA polymerization mixture and separate the powder, after the separated mother liquor is neutralized, take 50kg of the mother liquor to be treated, add copper sulfate, calcium borate each After 100 g, stir evenly, place in an evaporator and heat to evaporate, and control the evaporation temperature to dryness to obtain a cake-like residue. Then put 150°C steam into the vacuum drum dryer to heat the drum; put 210°C heat conduction oil into the tray jacket and cloth scraper for heating, and after the system runs stably at idle, continuously add materials into the tray for drying Evaporated to dryness. Control the rotational speed of the drum to be 6 rpm, the surface temperature of the drum to be 106° C., and the feed rate to be 0.57 kg / min. The separated NMP crude product enters the solvent recovery system, which includes a two-stage thin film evaporator t...

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Abstract

The invention discloses a method for reducing viscosity of residue on evaporation from distillation recovery of a polymerization solvent NMP for producing PPTA. The method is as below: neutralizing a mixed mother liquor containing NMP with alkali, adding composite salt, and conducting coarse steaming and concentration to dryness to obtain pie-shaped residue, wherein the composite salt comprises sulfate and calcium salt; conducting rotary drum evaporative desalination on the pie-shaped residue after coarse steaming and concentration; and isolating salt slag and NMP for refining. The method improves the viscosity of a NMP-water-CaCl2 multicomponent system, reduces the adhesiveness of CaCl2 residue on evaporation in the wall, and avoids the formation of high-viscosity NMP-water-CaCl2 ternary complex adhered to the inner surface of the evaporator and tube wall of a heat exchanger in the evaporation recovery of NMP solvent, so that the multi-effect evaporation process for distillation recovery of NMP solvent can be conducted continuously, stably and efficiently.

Description

technical field [0001] The invention belongs to the technical field related to the synthesis of PPTA para-aramid fibers, in particular to the recovery of PPTA polymerization solvents containing CaCl 2 The process of viscosity reduction modification of the evaporation residue. Background technique [0002] PPTA is the abbreviation of the English name poly(1,4-phenyleneterephthalamide), and the Chinese name is polyparaphenylene terephthalamide. PPTA is a synthetic resin formed by polycondensation of two monomers, terephthaloyl chloride and p-phenylenediamine. The resin can be used to produce high-performance para-aramid fiber PPTA aramid. Its representative product is a series of products with the brand name Kevlar of DuPont in the United States, commonly known as aramid 1414 in China. [0003] PPTA has lyotropic liquid crystallinity and is a kind of main chain type organic polymer liquid crystal. Para-aramid fibers made of PPTA have outstanding high strength, high modulus,...

Claims

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Application Information

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IPC IPC(8): C08J11/02
Inventor 朱福和张渊邓飞张跃严生虎沈介发刘建武李国庆陈代祥
Owner SINOPEC YIZHENG CHEM FIBER
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