Continuous-processing caprolactam polymerization kettle

A technology of caprolactam and polymerization kettle, applied in the field of polymerization kettle, can solve the problems of unfavorable reaction system material flow and mixing, inability to meet the needs of large-scale production, difference in quality of polymer products, etc., to achieve temperature uniformity in the kettle, and quality Uniformity, consistent response time

Active Publication Date: 2014-02-19
FUJIAN JINJIANG TECH
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Problems solved by technology

[0011] The existing traditional reactor structure can no longer meet the needs of large-scale production, as well as the new requirements for reactor efficiency and product quality
In traditional reactors, gear pumps are usually used to transport materials. If this method is still used in large-capacity reactors, it will inevitably lead to uneven mixing, and due to the influence of wall effects in the diameter dir

Method used

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  • Continuous-processing caprolactam polymerization kettle

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Embodiment

[0043] Such as figure 1 As shown, the present invention includes a polymerization kettle composed of a two-stage kettle body, the first section is a pressurized kettle body (2), and the second section is an atmospheric pressure kettle body (4). As its supporting device, it also includes a raw material preheater (1), a gear melt pump (3), a circulating oil pump (5) for the heat medium of the preheater, a high level tank (6), and a pressurized kettle body (2) Fractionation towers (7 and 10), impregnation tanks (8 and 11) and condensers (9 and 12) matched with the normal pressure still body (4).

[0044] Raw material preheater (1) The heat generated during the polymerization process is used as the raw material preheater, and the shell and tube heat exchanger is used to reduce resistance and facilitate the flow of raw materials; according to the scale of the subsequent polymerization tank, its capacity and heat transfer area.

[0045] The feed port (23) at the top of the first s...

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Abstract

A continuous-processing caprolactam polymerization kettle is characterized by comprising two kettle bodies, wherein the first segment is a pressure kettle body and the second segment is a normal-pressure kettle body. The first pressure kettle body is a reactor with a taper outlet, a feed inlet and a reflux mouth are arranged at a kettle cover head, a tubular heat exchanger is arranged below the kettle cover head in the kettle, and the taper outlet is connected with the second normal-pressure kettle body via a gear melt pump. The second normal-pressure kettle body is a reactor with a taper outlet, a feed inlet and a reflux mouth are arranged at a kettle cover head, the feed inlet in connected with the first pressure kettle body via a gear melt pump, a taper slit pressure-releasing device is arranged at the inlet end in the kettle, a tubular heat exchanger and a coaxial multilayer convex perforated plate are successively arranged below the pressure-releasing device, and a inverse-taper baffle plate is arranged in the taper outlet. By employing the above structure design, the flow and the mixing of material fluid in the polymerization kettle are effectively improved, and the problems are solved that the reaction is not uniform and the synthesized product is not uniform in molecular weight and molecular weight distribution.

Description

technical field [0001] [0002] The invention relates to a polymerization kettle, in particular to a polymerization kettle for continuous caprolactam polymerization. [0003] Background technique [0004] [0005] At present, most of the polymerization kettles used in the field of polyamide industrial production are tubular polymerization kettles, which are heated in sections with heat transfer oil as the heat carrier, and the moisture generated during the reaction process is continuously discharged from the top of the reactor. With the continuous expansion of the polyamide fiber market in my country, higher requirements are put forward for the production capacity and product quality of polyamide, especially the molecular weight and distribution of polyamide, and then the capacity, heat transfer efficiency and pressure rating of the reactor And the multi-applicability of stirring and mixing puts forward higher requirements. [0006] Chinese invention patent ZL200610016937...

Claims

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Application Information

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IPC IPC(8): C08G69/16
Inventor 陈飞陈万钟
Owner FUJIAN JINJIANG TECH
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