METHOD OF DEGASSING AND IMPARTING INTERMEDIATE PROPERTIES TO POLYOLEFIN PARTICLES OBTAINED DURING POLYMERISATION OF OLEFINS Russian patent published in 2017 - IPC C08F6/00 C08F10/00 C08F10/02 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of degassing and imparting intermediate properties to polyolefin particles obtained during polymerisation of olefins. Method for production of olefin polymers involves formation of polyolefin particles by polymerisation in presence of catalyst in a polymerisation reactor. Method then includes unloading of polyolefin particles from reactor and degassing of polyolefin particles with a nitrogen stream in a degassing tank. Degassing tank is partially filled with polyolefin particles. At continuous transfer of polyolefin particles from degassing tank into melt mixing device and unloading polyolefin particles from polymerisation reactor with constant speed, free space inside degassing tank receives additional polyolefin particles during at least 3 hours.

EFFECT: providing operating flexibility for continuation of polymerisation process during a certain period of time during shutdown of melt mixing device without need to install storage containers between stages of degassing and granulation of polyolefin particles and minimisation of requirements in their pneumatic transportation.

12 cl, 1 dwg