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Method and system for monitoring gel formation in a polyamide synthesis process

A polyamide and gel technology, which is applied in the field of polyamide synthesis technology, can solve the problems of lowering product quality, being expensive, and being heavy, and achieves the effect of reducing cost and time loss

Active Publication Date: 2018-05-22
INVISTA TEXTILES (U K) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alternatively, due to difficulties or problems with the autoclave, the temperature may rise above the threshold temperature
Gel buildup over time can lead to failure of the autoclave and deterioration of the product
When an autoclave fails or product drops below a quality threshold, it can be burdensome, time consuming and expensive to take the autoclave out of production and overhaul
Accordingly, current methods and systems for making polyamides may experience unexpected failures of autoclaves and reduced product quality

Method used

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  • Method and system for monitoring gel formation in a polyamide synthesis process
  • Method and system for monitoring gel formation in a polyamide synthesis process
  • Method and system for monitoring gel formation in a polyamide synthesis process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] Example 1. Comparative example, failure of flasher pump, excluding gel time control unit.

[0108] Flasher feed pump failure. In response, the flasher feed pump, finisher pump, and transfer line pump are switched from active mode to idle mode. The flasher, finisher, and transfer line temperatures were maintained at 285°C, the flasher was maintained at about 138 KPa, and the flasher feed pump was repaired for 33 hours. After finisher pump reconditioning is complete, the temperature and pressure of the flasher, transfer line, and finisher are increased in preparation for transitioning the flasher feed pump, finisher pump, and transfer line pump from idle mode to active mode. However, after switching the flasher feed pump, finisher pump, and transfer line pump to active operation, the flasher pump was unable to pump material through the flasher.

[0109] During idle mode, the flasher experienced 33 hours at 285°C and 138 KPa, and the flasher was completely gelled. The...

Embodiment 2

[0110] Example 2. Failure of the flasher pump using a gel time control unit in a system using baffled reactors .

[0111] Flasher feed pump failure. In response, the flasher feed pump, finisher pump and transfer line pump were switched from active mode to idle mode, the temperature was maintained at 285°C and the pressure of the flasher was maintained at 138KPa. The gel time control unit is activated in response to switching the flasher feed pump, finisher pump, and transfer line pump to idle mode. In response to activating the gel time control unit, a gel time is generated. The gel time is indicated as 6 hours. The baffled reactor was converted to idle mode where the reactor outlet to the flasher was closed and approximately 500 L of water was introduced into the baffled reactor to reduce the polyamide concentration. The temperature of the material in the flasher, finisher and transfer line is communicated (transmitted) to the gel time control unit and the gel time is co...

Embodiment 3

[0114] The general system of embodiment 3 and embodiment 4

[0115] In the batch nylon 6,6 manufacturing process, adipic acid and hexamethylenediamine are mixed in approximately equimolar ratios in water to form an aqueous mixture containing the nylon 6,6 salt and having about 50% by weight water. The brine solution was delivered to the evaporator at approximately 90 L / min. The evaporator heats the brine solution to about 125-135°C (130°C) and removes water from the heated brine solution such that the water concentration is about 30% by weight. The evaporated salt mixture was transferred to the autoclave at approximately 75 L / min, so that approximately 10,000 L of evaporated salt mixture filled the autoclave. The autoclave heats the material to 270-290°C (280°C) to achieve a water concentration of about 0.1% by weight and a relative viscosity of about 60 to obtain the appropriate final degree of polymerization range for the polyamide, after which the finished polymerization...

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Abstract

The present disclosure relates to methods and systems for monitoring for gel formation in the production of a polyamide product. In one embodiment, the present invention provides a method that can include directing a partially polymerized polyamide mixture through a flasher feed pump, a finisher pump, and a transfer line pump. The method can include switching the flasher feed pump, the finisher pump, and the transfer line pump from a first operating mode to a second operating mode. The method can include activating a gel time control unit and can be activated to estimate a gelation time for at least one of a flasher, a finisher, and a transfer line. The method can include switching a reactor of the polyamide synthesis system from the first operating mode to the second mode.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of priority to US Provisional Patent Application No. 61 / 818,289, filed May 1, 2013, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present application relates to polyamide synthesis processes and, in particular, to methods and systems for monitoring gel formation in polyamide synthesis processes. Background technique [0004] Polyamides have useful properties such as extreme durability and strength, which allow them to be used in a variety of environments. Polyamides such as nylon, aramid, and sodium poly(aspartate) are commonly used, for example, in carpets, air bags, machine parts, apparel, rope, and stockings. Nylon 6,6 is the most commonly used polyamide. The long molecular chain and dense structure of nylon 6,6 qualify it as an advanced nylon fiber, which exhibits high mechanical strength, rigidity and thermal stabilit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/28
CPCC08G69/04C08G69/28
Inventor 唐纳德·J·福斯特查尔斯·R·克尔曼托马斯·A·米茨卡保罗·诺米科斯约翰·P·普安萨蒂
Owner INVISTA TEXTILES (U K) LTD