Catalyst adding device and method for continuous production of polypropylene

Abstract

The invention discloses a catalyst adding device and method for continuous production of polypropylene, and belongs to the technical field of polypropylene production. The device includes a stirring tank, the top of the stirring tank is connected to a charging barrel through a charging pipeline, an outlet end of the charging pipeline is connected to the charging barrel, an inlet end of the charging pipeline is connected to the stirring tank, a mixture of a catalyst and white oil is contained in the charging barrel, a discharge port is formed at the bottom of the stirring tank, the discharge port is connected to a screw pump through a pipeline, the screw pump is connected to a propylene pipeline through a discharge pipeline, the discharge pipeline is further connected to a propylene flushing pipeline, and the charging barrel is connected to a nitrogen cylinder through a nitrogen pipeline. The powdery catalyst is uniformly dispersed in the white oil, so that the concentration stability of the catalyst is improved when the catalyst is added into a production system, the mixture of the catalyst and the white oil is quantitatively and uniformly added into the system at a constant speedby using a screw pump, and the purposes of stabilizing the reaction rate and stabilizing the production are achieved.

Description

technical field [0001] The invention relates to the technical field of polypropylene production, in particular to a catalyst adding device and method for continuous production of polypropylene. Background technique [0002] In the production process of polypropylene, the method of adding solid powder catalyst is used. During continuous production, due to the uneven distribution of powder catalyst in the catalyst storage tank, the amount of catalyst added is unstable, thereby affecting the stability of the reaction. During the entire reaction process, there will be a reaction fluctuation every 2 days, resulting in an increase in recycled materials and a decrease in conversion rate. In severe cases, it may even cause shutdowns (about 2-3 times of abnormal shutdowns per year due to excessive and uneven powdered catalysts), which greatly affects the normal production of polypropylene. Contents of the invention [0003] In view of the above technical problems, the present inve...

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Problems solved by technology

[0002] In the production process of polypropylene, the method of adding solid powder catalyst is used. During continuous production, due to the uneven distribution of powder catalyst in the catalyst storage tank, the amount of catalyst added is unstable, which affects the stability of the reaction.

During the entire reaction process, there will be a reaction fluctuation every 2 days, resulting in an increase in recycled materials and a decrease in conversion rate

In severe cases, it may even cause shutdown (the number of abnormal shutdowns is about 2-3 times a year due to excessive and uneven powder catalyst), which greatly affects the normal production of polypropylene

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