A method for converting an olefin or an alcohol has a pretreatment step of obtaining a conductive catalyst by a pretreatment for suppressing electrostatic charging of a non-conductive catalyst and a step of converting an olefin or an alcohol by a fluidized bed reaction using the conductive catalyst.

A regeneration device, a device for preparing low-carbon olefins, and a use thereof are provided. The regeneration device includes a first regenerator and a second regenerator; a first activation zone of the first regenerator is connected to the second regenerator through a pipeline, such that a catalyst in the first activation zone is able to be delivered to the second regenerator; and the second regenerator is connected to a gas-solid separation zone of the first regenerator through a pipeline, such that a catalyst in the second regenerator is able to be delivered to the gas-solid separation zone. The regeneration device can adjust the coke content, coke content distribution, and coke species in a dimethyl ether/methanol to olefins (DMTO) catalyst to control an operation window of the DMTO catalyst, which improves the selectivity for low-carbon olefins and the atomic economy of a methanol-to-olefins (MTO) technology.

A gas-phase process for producing a polypropylene random copolymer in a fluidized bed reactor is provided. The process comprises feeding a fluidizing medium into a reactor vessel containing a bed of catalytically active polyolefin particles. In one embodiment, the fluidizing medium comprises propylene gas, C2 and/or C4-C8 -olefin comonomers, hydrogen, and an inert gas. The momentum flux of the fluidizing medium, defined as is 7.0 N/m.sup.2 or greater and the condensing level of the reactor cycle gas when entering the reactor is less than 25 wt. %. In the above equation, .sub.g is the density of the fluidizing medium and SGV is the superficial gas velocity of the fluidizing medium.

[00001]${\left(\mathrm{SGV}\left[\frac{m}{s}\right]\right)}^2*{}_g\left[\frac{\mathrm{kg}}{m^3}\right]$