Polymerization tank temperature distribution estimation apparatus and polymerization tank temperature distribution estimation program

Abstract

This invention provides a polymerization tank temperature distribution estimation apparatus that can estimate the temperature distribution within a gas phase polymerization reaction tank with a single helical blade. The polymerization tank temperature distribution estimation apparatus comprises means for calculating the position and velocity of all of particles for each predetermined time in an agitation field by a discrete element method, means for calculating the average value of particle velocity for each time for each microelement in a reaction tank and calculating the time-mean particle velocity in each microelement, means for correcting the particle velocity for each microelement so as to satisfy a particle mass conservation formula, means for using the corrected particle velocity as an initial value of the gas-liquid velocity, means for correcting the initial value for each microelement so as to satisfy a gas-liquid mass conservation formula, means for calculating a particle enthalpy using the corrected particle velocity, the heat of reaction of particles for each microelement, and heat transfer coefficient between the particles and the gas and liquid and calculating the particle temperature corresponding to the particle enthalpy, means for calculating a gas-liquid enthalpy using the corrected gas-liquid velocity and the coefficient of heat transfer and calculating the gas-liquid temperature corresponding to the gas-liquid enthalpy, and means for outputting the calculated particle temperature and gas-liquid temperature for each predetermined time.

Description

technical field [0001] The invention relates to a polymerization tank temperature distribution calculation device and a polymerization tank temperature distribution calculation program for calculating the temperature distribution in a gas phase polymerization reaction tank of a single helix wing. Background technique [0002] In recent years, the production process of polypropylene has been simplified due to the high activation and high stereoregularity of the catalyst, and a gas phase polymerization process is generally used. Compared with the conventional slurry polymerization, since the gas phase polymerization reactor does not use a solvent, it is a very streamlined process that does not require a solvent recovery system and a drying system. [0003] However, since the heat capacity is low due to the gaseous phase state, the temperature change tends to become severe with respect to the reaction amount change, and this tendency becomes remarkable as the equipment becomes ...

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Problems solved by technology

[0007] However, Non-Patent Document 3 shows the study of simulating the particle flow in the stirred reactor using DEM, but it does not take the reaction into consideration, so the temperature distribution in the polymerization tank cannot be estimated from this.

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