Recycling glycol stirring and mixing tank

Abstract

The invention discloses a recycling glycol stirring and mixing tank. The recycling glycol stirring and mixing tank comprises a tank body, a liquid inlet is formed in the tank body, the liquid inlet isconnected with a polycondensation recycling glycol pipeline; and further comprises a sinking and inserting pipe, the top end of the sinking and inserting pipe is connected with high temperature glycol pipeline coming from a process tower, the lower end of the sinking and inserting pipe penetrates through the tank body and extends to the lower part of a liquid level, and the tank body is also provided with a mixing device and a jacket condenser. According to the recycling glycol stirring and mixing tank, the original static storage mode of recycling glycol is changed, the loss of glycol is reduced, the flash vaporization phenomenon caused by the direct top entry of high temperature glycol is avoided, material mixing is even, and discharge pipeline blocking under long-term working conditions is avoided.

Description

Technical field: [0001] The invention relates to the field of chemical industry, in particular to a stirring and mixing tank for recycled ethylene glycol. Background technique: [0002] In the PET polyester production process, most of the recycled ethylene glycol produced in the polycondensation section and the ethylene glycol extraction system in the process tower is recycled into the mixed ethylene glycol tank before being used for slurry preparation. With the continuous advancement of polyester technology, the popularization speed of the device with one head and two tails and one head and three tails is relatively fast. It has the characteristics of low energy consumption, product differentiation and diversification. It is precisely because of these characteristics that the differentiated poly In the ester plant, due to different products and different yields, the contents of diethylene glycol, unreacted small molecules or three monomers contained in recycled ethylene gly...

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Problems solved by technology

[0003] But at present, the internal structure of the recycling ethylene glycol tank of almost all polyester plants with one end and multiple tails is not specially designed, and its structure is as follows: figure 2 As shown, it is just a container such as a tank, the top of the tank is connected to the polycondensation glycol recycling pipeline, and there is an exhaust gas recovery outlet on the top of the tank, and the flow meter valve group and the regulating valve valve group are connected to the bottom of the tank , the slurry is transported to the slurry tank through the pipeline, without considering that the content of various entrained substances in the recycled ethylene glycol is not the same, it has the following disadvantages: 1. It is only a static container, and ethylene glycol is reused in each way Alcohol enters from the top of the tank without sufficient mixing and uneven distribution; 2. Recycled ethylene glycol contains more unreacted small molecule polymers, which are prone to sedimentation at the bottom of the tank. With the extension of the production cycle , the stock is accumulating more and more, once there is a disturbance, it is easy to block the pipeline and flowmeter, and in severe cases, it will also affect the stability of production and the dyeing of the product; 3. In order to avoid the mutual interference between the various lines, some devices are also designed In order to reuse the ethylene glycol refining device, this device not only consumes a lot of energy, but also produces a large amount of solid waste

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