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Polyethylene terephthalate solid-state polycondensation technique

A polyethylene terephthalate and solid-phase polycondensation technology, which is applied in the field of polyester synthesis, can solve problems such as unreasonable energy utilization and unapplied solid-phase polycondensation technology, and achieve considerable economic benefits, remarkable energy-saving effects, and saving The effect of heating energy

Inactive Publication Date: 2008-07-30
SINOPEC OILFIELD SERVICE CORPORATION
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] There are several deficiencies in these existing solid-state polycondensation processes: one, energy utilization is unreasonable
As far as the applicant knows, this technology has been used to recycle waste polyester, but it has not been applied to solid-state polycondensation process

Method used

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  • Polyethylene terephthalate solid-state polycondensation technique

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Embodiment 1

[0020] PET melt 125000kg / hr (η=0.62dl / g) is cut into pellets in hot water, the temperature of hot water is 95°C, cut into cylindrical particles with a diameter of 3.6mm, and the particles are quickly transported to the separation dryer with the water flow, Separation and drying are carried out, the water velocity is 5m / s, the total residence time of the particles in the pelletizing chamber and the separation drier is 2 seconds, the nitrogen flow rate (m 3 / hr): slice flow rate (kg / hr)=0.3; the temperature of the slice at the outlet of the separation drier is 183°C, enters the fluidized bed crystallizer, and passes into the nitrogen flow rate of the crystallizer (m 3 / hr): slice flow rate (kg / hr)=2.4, nitrogen temperature is 200° C., 85% of the nitrogen from the fluidized bed crystallizer is recycled, and 13% enters the separation drier. The residence time in the crystallizer is 10min, the slice outlet crystallinity 43% (density method), 210 ℃ of temperatures; The residence tim...

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Abstract

The invention relates to a technique for further generating high viscosity polyester through solid phase polycondensation by using a PET polymer obtained through melt polycondensation. Firstly, medium viscosity polyester is used for granulation in warm water at 80 to 97 DEG C, the formed polyester granules and water are delivered to solid-liquid separation and drying equipment to ensure the granules to be separated from the water, the separated water flows into a water tank and is then delivered to a granule cutting room for periodic operation, the granules enter into crystallization equipment to be crystallized in inert gas atmosphere, the crystallized granules enter into a solid phase polycondensation reactor for reaction, the inherent viscosity is further improved, and the granules after the reaction enter into a cooler to be cooled down. The process of the technique is short, the chip bunker of a PET melt polymerization device, the raw material bin of a solid phase polycondensation device, and a delivery device can be saved, and crystallization is only required to be performed once during the solid phase polycondensation step; the energy saving effect is very remarkable, in each kilogram of polyester pellets, the energy can be saved by 69.1 kcal, the heating energy can be saved by 75.23 kcal, therefore, the economic efficiency is very remarkable.

Description

technical field [0001] The invention relates to a polyester production method, in particular to a polyester polymer obtained by melt polycondensation to further generate high-viscosity polyester through solid-state polycondensation, and belongs to the technical field of polyester synthesis. Background technique [0002] Polyethylene terephthalate (PET) occupies a very important position in polyester polymers. Therefore, when people talk about "polyester", they always refer to PET consciously or unconsciously. High-viscosity polyesters are widely used in polyester bottles, industrial yarns, sheets and other fields, and solid-state polycondensation is the main method for producing high-viscosity polyesters. At present, there are mainly three international patent providers in the production of high-viscosity polyester: Sinco, Buhler and Bepex. After several times of heating and crystallization, the solid-state polycondensation reaction is carried out, and the high-viscosity po...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/80
Inventor 沈希军张军
Owner SINOPEC OILFIELD SERVICE CORPORATION
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