Low Temperature Short Process Differential Pet Equipment And Technological Innovation Point

Core of "low temperature short process differential pet equipment and technology"

The esterification reaction temperature is greatly reduced by the double esterification reaction reactor. The high efficiency push flow, the by-product is less, the raw material consumption is small, and the comprehensive energy consumption is less than 70 kilogram standard oil / ton polyester.

The tower pre polycondensation reactor has no agitation, and the annular gas channel membrane structure is adopted internally, so that the oligomeric materials can be driven by ethylene glycol steam through a certain quantity of special materials.

The cage type film forming final polycondensation reactor has the characteristics of small unit production capacity, small volume and high efficiency of SkyDrive membrane pulling. The combination of SkyDrive and cage frame ensures that the material is spirally advancing in the reactor and achieves the effect of horizontal pushing flow.

The self-developed dynamic mixer and homogenizer are set up on the oligomer pipe to ensure that the modifier is mixed evenly with the main material.

The application of "low temperature short process differential pet equipment and technology" has reduced the comprehensive energy consumption of polyester production by more than 30% compared with the international average.

One of the important inventions of this project is that the heat medium used in the process requires liquid phase pportation, in-situ flash evaporation, gas phase heating and thermal energy cascade application. The invention and use of the technology provide a simple way for continuous polymerization device to use coal stove as heat source.

Heat medium liquid phase pfer, flash evaporation in the installation area, cascade utilization of thermal energy.

The gas phase heat medium produced by flash evaporation has uniform heat pfer, high efficiency, simple system and strong anti wave ability.

In situ flash technology has improved the utilization efficiency of heat energy.

The use of in situ flash technology has reduced fuel consumption by 13% compared with that of international similar technologies. In the process of popularization and application of equipment and technology, integrated innovation has been achieved. In the first time, the lithium bromide refrigerator has been used in China to recover the steam energy of by-products from esterification, and save about 12.5 kilograms of standard oil / ton products.

The recovered cooling capacity is used for circulating ethylene glycol system cooling and granulator circulating water system in the plant. Instead of the original technology, peripheral utilities need to provide chilled water process.

The energy recovery technology of the by-product water vapor of esterification makes the energy saving effect of the device more remarkable.

The perfect combination of technology and equipment makes the production process highly flexible, operable and flexible in variety.

Continuous polymerization of cationic product development process is based on nearly 20 years of research on modified polyester, developed a new continuous differential polyester engineering technology, and successfully developed on the basis of the construction of high-quality cationic dyeable dyeable polyester products, and direct spinning filament.

The addition of different modifiers in oligomeric pipes can produce modified polyester products with large gloss, full extinction, CDP, ECDP, flame retardant, anti pilling, raw liquor coloring (black polyester) and high shrinkage.

The direct spinning technology will further increase the market competitiveness of differential fiber products, make continuous production of differentiated polyester products, save investment, reduce production operation costs, product quality is stable, quality is excellent, and the full volume rate can reach more than 95%.

In order to solve the technical problem of uniform dispersion of modified polyester additives in polyester materials, the on-line addition technology of modifier in oligomer pipeline was developed, and a high quality and highly uniform modified polyester was produced.

The on-line addition technology of the modifier pipeline has realized the centralized esterification and dispersion polycondensation, that is, after the same esterifying kettle, the different condensation lines can be used to meet the requirements of producing different varieties of products, shorten the cycle of replacing the production varieties and reduce the pition materials for replacing the production varieties, so as to realize the flexibility of the device.