PTT continuous polymerization pre-crystallization process

Abstract

The invention discloses a PTT continuous polymerization pre-crystallization process. The PTT continuous polymerization pre-crystallization process comprises the following steps that 1, PTT materials are sliced with a slicing machine, and then PTT slices are formed; 2, the PTT slices are sent to a water strainer of a granulator through a discharging hopper and a granulating pre-separator for preliminary solid-liquid separation, so that most moisture is filtered out; 3, the wet PTT slices are sent into a pre-crystallization device for pre-crystallization and drying treatment; 4, the dried PTT slices subjected to pre-crystallization and drying treatment are sieved through a vibrating screen so as to remove defective products; and 5, warehousing is conducted. The PTT continuous polymerizationpre-crystallization process has the beneficial effects that a compact structure advantage is achieved, the energy conversion and heat transfer processes can be greatly compressed, so that producing, packing, transporting and assembling are convenient to achieve. Valley-electricity phase-change energy storage devices with various types and specifications can be designed in a combined manner, and good promoting significance to phase-change energy storage industries is achieved.

Description

technical field [0001] The invention relates to the field of chemical fiber production technology, in particular to a PTT continuous polymerization pre-crystallization technology. Background technique [0002] Polytrimethylene terephthalate (PTT) is a new type of aromatic polyester material with excellent performance developed at the end of the 20th century. Compared with PET and PBT, its special "odd carbon effect" makes it have a unique spiral structure and very good elasticity. PTT has the softness of nylon, the bulkiness of acrylic fiber and the stain resistance of polyester. It is also easy to dye, antistatic, and is widely used in the fields of clothing, industry, decoration and engineering plastics due to its excellent PTT performance. The crystallization performance of PTT is between that of PBT and PET. Since the glass transition temperature of PTT is very low at 25-65°C, it is necessary to pre-crystallize PTT for industrial production and application to prevent ag...

AI Technical Summary

Problems solved by technology

[0006] Ebullating fluidized bed pre-crystallizer is not suitable for materials with high water content and easy to stick into agglomerates

However, the PTT slices from the pelletizer are easy to stick after being dried, and the water content is relatively high when directly entering the pre-crystallizer without drying.

At the same time, maintaining the fluidized state of slices requires a large amount of hot air circulation, high energy consumption, and high-speed collisions between slice particles

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