Multi-level and multi-direction Y-type impinging jet mixer

Abstract

The invention relates to a multi-level and multi-direction Y-type impinging jet mixer provided with multi-level impinging jet passages; an acute angle is formed between jet flows of each impinging jet passage at the same level, and the jet flows converge in a same impinging zone of the jet flows, mixed flow paths formed after each jet flow is impinged are positioned on a same straight line, and the impinging zone of the jet flows at different levels are alternatively, conterminously or overlappedly arranged on the straight line. Generally, the direction of the mixed flow at each level is vertically downward, the center of the impinging jet zone at the post level is positioned below the center of the impinging jet zone at the front level or is overlapped with the center of the impinging jet zone at the front level, the jet flow passages are two-level or three-level, the number of the jet flow passages at the same level is 2 or 3, and the jet flow passages at the same level are uniformly and symmetrically distributed. The mixer can realize momentary fall mixing of different materials with different flow rates and different temperatures, and the mixing process can be continuously and stably carried out mainly for polymerization process of aramid 1414, and the like.

Description

technical field [0001] The invention relates to the impingement mixing technology of two or more liquid materials, which is suitable for the continuous operation of the mixing process, especially for the purpose of uniform mixing in an instant, and is especially suitable for the flow difference of the two or more liquid materials to be mixed. A process that is large and prone to phase change when mixed, such as the polymerization process of aramid fiber (AramidFibers) 1414. Background technique [0002] Aramid 1414, also known as aramid II or Para-aramid Fibar (Para-aramid Fibar), the scientific name is poly-p-phenylene terephthalamide, which is composed of terephthaloyl chloride (TPC) and p-phenylenediamine (PPDA). This monomer is prepared by low temperature solution polymerization process. The polymerization process is as follows: PPDA is pre-mixed with a solvent to form a pre-mixture, and after the pre-mixture is cooled to 5-10°C, it is mixed with partially molten TPC (a...

AI Technical Summary

Problems solved by technology

[0004] (1) The traditional static mixer uses its special structure to mix the materials. The mixing degree depends on the special flow channel design and the mixing flow process, but it cannot guarantee that the two monomers are mixed evenly in an instant.

At the same time, the two streams of materials are in full contact, and the high-flow and low-temperature prepolymer solution reduces the temperature of the mixing chamber, causing the TPC inlet and the unmixed TPC in the device to solidify, resulting in blockage of the TPC inlet and the device, and the continuous mixing process cannot be guaranteed.

[0005] (2) The concentric jet mixer injects the first material into the high-speed flow of the second material mixing chamber, so that the materials can be mixed, but because the flow rate of the second material in the mixing chamber is low and the distance is short, the distance between the two materials There are not many parts that can reach the turbulent state at the same time, and there are a large number of laminar flow areas, so it is difficult to achieve instantaneous complete mixing

[0006] (3) The T-type jet mixer achieves material mixing by means of collision, which can meet the requirements of instantaneous and uniform mixing, but if the ratio of the flow rate of the two streams of material differs greatly during mixing (for example, the polymerization process of aramid fiber 1414 is 10-18:1 Left and right), after the impact, the flow tends to the side of the TPC melt with a small flow rate, and it is easy to flow to the wall of the mixer. At the same time, because the impact point is biased towards the TPC injection port, the high-flow low-temperature flow reduces the temperature near the TPC outlet, causing TPC to spray at the outlet. Freezing at the tube, which prevents the mixing process from continuing

The existence of reflux affects the stoichiometric ratio of the two monomers, which can easily cause uneven polymerization of the monomers, resulting in an excessively wide molecular weight distribution of the final product

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