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Technology for improving polyester esterification reaction speed

A technology of esterification reaction and technology, which is applied in chemical fiber and chemical industry, can solve the problems of large energy consumption and achieve the effects of less equipment investment, lower energy consumption and cost savings

Inactive Publication Date: 2009-04-15
周向进
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that a large amount of vaporized ethylene glycol is cooled and refluxed in the fractionating tower, and then enters the reactor after being heated up by the reboiler (heat exchanger). This process of evaporation and condensation consumes a lot of energy

Method used

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  • Technology for improving polyester esterification reaction speed

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Experimental program
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Effect test

Embodiment 1

[0073] The reactor structure is as figure 1 As shown, among them: 1 is the vacuum valve, 2 is the inlet valve of the separation tower, 3 is the outlet valve of the separation tower, 4 is the three-way valve, 5 is the feeding port, 6 and 7 are the nitrogen interface and valve, 8 is the sampling valve , 9 is the discharge port.

[0074] According to the raw material ratio of PTA 5.0kg, EG 3.2kg, and antimony triacetate 2.5g, the materials are prepared and put into the reactor, the reactor is sealed, the gas phase air is replaced with nitrogen, and the temperature is raised. At the same time, feed nitrogen to maintain the internal pressure of the reactor at about 2.5kg / cm2 (gauge pressure). When the temperature of the reactor material reaches 230°C, the system pressure is about 2.5kg / cm2 (gauge pressure). Reaction conditions. Start to slowly open the water outlet valve of the separation tower (process tower), measure the water output, calculate the degree of completion of the e...

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Abstract

The invention discloses a technique for improving esterification reaction speed of polyester, which uses nitrogen as auxiliary raw materials; in the process of esterification reaction, nitrogen in gas phase or in liquid phase is sent into a reactor, which breaks the original balance of gas-phase and liquid-phase reaction system, so as to improve the desorption speed of byproduct water, and lead the esterification reaction balance to move toward the positive reaction, and therefore the esterification reaction speed can be improved. With the adoption of the invention, the production capacity of esterification device can be improved about 30 percent without changing the major structure of the polyester device. Owing to the recycling use of nitrogen, the producing cost of unit product is hardly improved, and equipment investment for improving technology is little and therefore, economic benefit is very obvious.

Description

technical field [0001] The invention belongs to the fields of chemical industry and chemical fiber, and is a part of the manufacturing technology of polyester polymer products. Background technique [0002] Polyester is a mature technology with over forty years of development. Over the years, there have been many studies on improving the production capacity of polyester plants, but there is no report on the research or application of increasing the rate of esterification reaction by feeding nitrogen into the polyester esterification reactor. Now the main polyester product is polyethylene terephthalate (PET). PET is the variety with the largest production capacity among synthetic fiber polymers. In addition to being used in the manufacture of polyester fibers, it is also widely used in the manufacture of bottles, films, plastics, etc. etc. In 2007, the production capacity of polyester in mainland China reached 23.06 million tons per year, and the output reached 16.5 million ...

Claims

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Application Information

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IPC IPC(8): C08G63/78
Inventor 周向进
Owner 周向进
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