Particular issues associated with underwater low density polyethylene pelletizing in tubular reactor processes
The urgency of the discussed issue is caused by the periodic underwater pelletizing unit performance degradation in the form of spontaneous increase of number of polyethylene pellets stuck together as well as practical non*controllability of this phenomenon. The main aim of the study: definition of...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | Russian |
| Published: |
Tomsk Polytechnic University
2019-05-01
|
| Series: | Известия Томского политехнического университета: Инжиниринг георесурсов |
| Subjects: | |
| Online Access: | http://izvestiya-tpu.ru/archive/article/view/1325 |
| Summary: | The urgency of the discussed issue is caused by the periodic underwater pelletizing unit performance degradation in the form of spontaneous increase of number of polyethylene pellets stuck together as well as practical non*controllability of this phenomenon. The main aim of the study: definition of polyethylene fractions in both high and low pressure recycling systems being able by physical and chemical properties to initiate pellet sticking process and determination of the structure of these polymers for predicting synthesis conditions for the purpose of the further minimization. The methods used in the study: IR-Fourier and NMR 13С-spectroscopy, differential scanning calorimetry, X-ray phase analysis, selective extraction, flotation density determination. The results: based on the data of physical and chemical polyethylene deposit analysis in high pressure systems the authors have made an assumption that the reason of pellet sticking is uncontrolled penetration of the polymer with such characteristics into the melt. Mixing of amorphized polymer deposit with low melting and crystallization temperatures with polyethylene of basic grade 153 was simulated; the comparison with stuck together pellets material in a contact point was made. Using the differential scanning calorimetry and X-ray phase analysis methods the material characteristic similarity was demonstrated. |
|---|---|
| ISSN: | 2500-1019 2413-1830 |