Production process of adding diethylene glycol in polyester polymerization

Abstract

The invention relates to a manufacturing technique for adding diglycol in the process of polyester polymerization, which is characterized in that the diglycol is added into a second esterifying kettle, and the technology is quickly adjusted; the diglycol is added into a TiO2 pipe together with TiO2, so that the problem of easy evaporation of the diglycol can be solved; and simultaneously the diglycol content in the first esterifying kettle and various EG (ethylene glycol) tanks is analyzed, prejudged in advance, and adjusted in advance, so that the balance problem in a system is solved and fluctuation of the diglycol in the system is avoided. The manufacturing technique effectively avoids influence of raw materials such as PTA on dyeing of spinning filament and finished product threads, controls the content of DEG in fused masses, improves the spinnability of the spinning filament, makes dyeing of the finished product threads more uniform, and simultaneously optimizes the technological flow of polymerization of five kettles and makes the technological flow more reasonable.

Description

technical field [0001] The invention relates to a production process, in particular to a production process of adding diethylene glycol in polyester polymerization. Background technique [0002] The world's polyester technology is developing towards a larger economic scale. The production capacity of a single series has increased from 100 tons / day and 200 tons / day in the 1980s to 300 tons / day, 400 tons / day, 480 tons / day, and 600 tons / day in the 1990s. With the expansion of single-series capacity, the investment cost per 10,000 tons of polyester will decrease proportionally. For example, the average production capacity of the world's top 30 polyester manufacturers has reached 360,000 tons / year, and the largest DuPont company has reached 1.4 million tons / year. The single-line production capacity of the largest device in the world has reached 600t / d production line. [0003] my country's polyester production is developed on the basis of the combination of independent develop...

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Problems solved by technology

[0006] The company adopts the five-pot process polymerization device of China Textile Institute, but there is no step of adding diethylene glycol in the process flow of the device

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