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Tubular reactor with improved design and method of using the same

A tubular reactor and pipeline technology, applied in chemical instruments and methods, chemical/physical/physicochemical fixed reactors, methods for chemically changing substances using atmospheric pressure, etc., can solve the problems of fire, efficiency loss, and Convenience and other issues to achieve the effect of low risk of combustion

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

[0007] In polyamide synthesis, there are safety risks associated with the use of large quantities of volatile materials as heat transfer media, including fire, combustion, and health risks, and there are issues such as those associated with the use of a single plant-wide heating circuit Issues such as loss of efficiency and inconvenience associated with multiple components for heating equipment

Method used

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  • Tubular reactor with improved design and method of using the same
  • Tubular reactor with improved design and method of using the same
  • Tubular reactor with improved design and method of using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1a

[0111] Example 1a. Comparative Example. Liquid Phase Heat Transfer Medium in Primary Heating Loop

[0112] Will 66 is heated to approximately 340°C and circulated through a primary heating loop in a nylon-6,6 manufacturing facility. The primary heating circuit will 66 at a suitable flow rate between the power chamber and the heat exchangers on the evaporator, reactor and finisher, after which the 66 is passed back to the powerhouse for reheating. Use about 10,000,000L in the primary heating circuit 66. 66 remains liquid throughout the process.

[0113] In the continuous nylon-6,6 manufacturing process, adipic acid and hexamethylenediamine are mixed in water in an approximately equimolar ratio to form an aqueous mixture containing nylon-6,6 salt, and the aqueous mixture has about 50 % by weight water. The brine solution was delivered to the evaporator at approximately 105 L / min. transfer heat from the primary heating circuit to the 66 is passed to the evaporato...

Embodiment 1b

[0116] Example 1b. Comparative Example. Vapor Phase Heat Transfer Medium in Primary Heating Loop

[0117] will DOWTHERM TM A is heated to a vapor at about 340°C and a pressure of about 400KPa and circulated through a primary heating loop between the powerhouse and the multiple unit operations in a nylon-6,6 manufacturing facility, where it transfers heat to the multiple unit operations, after which Transfer back to the powerhouse for reheating. Use approximately 10,000,000L of DOWTHERM in the primary heating circuit TM a. DOWTHERM TM A is maintained as a vapor throughout the process and is circulated at a rate sufficient so that the material does not drop below the saturation temperature in circulation.

[0118] The continuous nylon-6,6 manufacturing process was carried out as described in Example 1a, but using vapor DOWTHERM throughout the process TM a. DOWTHERM per Kg compared to other methods using heat transfer materials that undergo a phase change during heat t...

Embodiment 1c

[0119] Example 1c. Comparative Example. Volatile Heat Transfer Medium in Primary Heating Loop with Condensation

[0120] As in Example 1b, but using DOWTHERM with a certain cycle rate TM A so that during heat transfer to multiple unit operations from DOWTHERM TM A absorbs enough heat to cause DOWTHERM in the primary heating loop TM Part of A condenses. To recycle the liquid produced to the rest of the unit operations and back to the powerhouse, additional equipment is required, including a liquid knock out tank, additional piping and pumps to return the condensate to the powerhouse for reheating and regasification. Maintaining precise temperature for each unit operation such as a tubular reactor is difficult because the temperature of the heat transfer medium can only be adjusted as a whole and not for individual units.

[0121] Example 1d. Comparative Example. Volatile Heat Transfer Medium in Leaky Primary Heating Loop

[0122] As in Example 1b. There is a leak in...

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Abstract

The present invention relates to methods, systems, and apparatus for making polyamides having at least two heat-transfer media for transferring heat to a tubular reactor. The method includes heating a first flowable heat-transfer medium, to provide a heated first flowable heat-transfer medium. The method includes transferring heat from the heated first flowable heat-transfer medium to a second flowable heat-transfer medium, to provide a heated second flowable heat- transfer medium. The method also includes transferring heat from the heated second flowable heat-transfer medium to a tubular reactor of a polyamide synthesis system.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of priority to US Provisional Patent Application No. 61 / 818,320, filed May 1, 2013, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present application relates to tubular reactors of improved design and methods of use thereof. 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, a smooth thermoplastic, is also 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 stability. [0005] Polyamides are synthesized in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/00B01J19/24C08G69/28
CPCB01J2219/00074B01J19/0013B01J3/042C09K5/10F28F23/02C09K5/048C08G69/28B01J19/243B01J2219/00094B01J2219/00103F28D15/00F28D2021/0022
Inventor 查尔斯·R·克尔曼托马斯·A·米茨卡约翰·P·普安萨蒂加里·R·韦斯特
Owner INVISTA TEXTILES (U K) LTD
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