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Nylon salt solution preparation processes with trim diamine

A nylon salt and solution technology, applied in the field of nylon salt solution preparation, can solve the problems of increasing the amount of equipment, investment cost and energy cost, etc.

Active Publication Date: 2014-11-05
INVISTA TEXTILES (U K) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, using a series of reactors increases the amount of equipment, investment costs and energy costs

Method used

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  • Nylon salt solution preparation processes with trim diamine
  • Nylon salt solution preparation processes with trim diamine
  • Nylon salt solution preparation processes with trim diamine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0139]Using a mechanical conveying system (i.e. screw / haul chain) or pneumatic conveying system (i.e. pressurized air, vacuum air or closed loop nitrogen) via FIBC discharge, lined FIBC discharge, lined box container discharge or hopper The rail car unloading station moves the AA powder from the unloading system to the supply container.

[0140] The supply container moves the desired AA powder into a loss-in-weight (L-I-W) feeder, which uses a PLC to adjust based on the low and high positions of the L-I-W hopper selected. The supply vessel meters the AA powder via a screw conveyor or rotary feeder at a sufficient loading rate such that at a maximum interval equal to, and preferably less than, two times the minimum L-I-W discharge time from the high to low L-I-W bin One-half fills the L-I-W feeder hopper so that a feedback signal of the L-I-W feeder feed rate is received at least 67% of the time.

[0141] The L-I-W feed system adjusts the rate of the L-I-W feed screw, as detec...

Embodiment 2

[0144] Modeling for the production of nylon salt solutions according to a continuous process. The nylon salt solution includes water and hexamethylene diamine adipate. The model was set up to achieve a salt concentration of 63% in the nylon salt solution and to achieve a target pH of 7.500. The feed rate of AA was determined based on the desired production of the nylon salt solution. The HMD and water feed rates can be determined based on the desired salt concentration and pH. Adipic acid was moved from the powder discharge system to the loss-in-weight feeder with low variability as described in Example 1.

[0145] The AA powder from the loss-in-weight feeder was directly fed to the continuous stirred tank reactor through a drop trough of nitrogen gas at 20-30 nm 3 / h rate injection to continuously clean the discharge machine and the vapor chute generated in the reactor.

[0146] The DCS set point for the loss-in-weight adipic acid feed rate was determined using a DCS mode...

Embodiment 3

[0161] The nylon salt solution was prepared as in Example 2, except that the on-line pH measurement was carried out under laboratory conditions: at about 25°C, at a concentration of about 9.5%.

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Abstract

Disclosed are nylon salt solution preparation processes including a trim diamine feed. The nylon salt solution is prepared by feeding a dicarboxylic acid monomer and a diamine monomer to a single continuous stirred tank reactor. The dicarboxylic acid is metered, based on weight, from a loss-in-weight feeder to the reactor. The nylon salt solution is formed continuously and has low variability from a target pH and / or a target salt solution concentration. The nylon salt solution is transferred directly to a storage tank, without further monomer addition, pH adjustment, or salt solution adjustment after exiting the continuous stirred tank reactor.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Application 61 / 818065, filed May 1, 2013, the entire content and disclosure of which is incorporated herein. technical field [0003] This invention relates to the preparation of nylon salt solutions, and more particularly to the preparation of nylon salt solutions using a supplemental diamine feed. Background technique [0004] Polyamides are commonly used in textiles, apparel, packaging, tire reinforcement, carpets, engineering thermoplastics for molded parts of automobiles, electronic equipment, sports equipment, and various industrial applications. Nylon is a high-performance material used in plastics and fibers that require excellent durability, heat resistance and toughness. Aliphatic polyamides known as nylons can be prepared from salt solutions of dicarboxylic acids and diamines. The salt solution is evaporated and then heated to polymerize it. A challenge in this prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/28
CPCC07C51/412C07C209/68C08G69/28B01J8/002B01J8/0045B01J19/006B01J19/0066B01J19/1881B01J2208/0061B01J2208/00619B01J2208/00752B01J2208/00787B01J2219/00083B01J2219/00094B01J2219/0011B01J2219/00114B01J2219/00162B01J2219/00164B01J2219/00166B01J2219/00177B01J2219/00186B01J2219/00202B01J2219/00211B01J2219/00231C07C55/02C07C211/12C07C55/14
Inventor 罗伯特·J·韦尔奇利恩·曼斯特保罗·诺米科斯康纳利斯·M·冯克
Owner INVISTA TEXTILES (U K) LTD
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