Fluidized bed reactor and process for producing olefins from oxygenates

摘要

The present invention provides a fluidized bed reactor and its use for producing olefins from oxygenates, the fluidized bed reactor comprises: a reaction zone located in the lower portion of the fluidized bed reactor and comprising a lower dense phase zone and an upper riser, wherein the dense phase zone and the riser are connected with each other transitionally; a separation zone located in the upper portion of the fluidized bed reactor and comprising a settling chamber, a fast gas-solid separation means, a cyclone and a gas collecting chamber, wherein the riser extends upwardly into the separation zone and is connected at its outlet with the inlet of the fast gas-solid separation means, the fast gas-solid separation means is connected at its outlet with the inlet of the cyclone via a fast gas passage, the cyclone is connected at its outlet with the gas collecting chamber, and the gas collecting chamber is located below the reactor outlet and connected therewith; and a catalyst recycle line for recycling the catalyst from the settling chamber back to the dense phase zone, a catalyst withdrawl line for withdrawing the deactivated catalyst from the settling chamber and/or the dense phase zone to the catalyst regeneration means, and a catalyst return line for returning the regenerated catalyst from the catalyst regeneration means to the dense phase zone.

主权项

1. A fluidized bed reactor, comprising:
a reaction zone located in a lower portion of the fluidized bed reactor and comprising a lower dense phase zone and an upper riser, wherein the lower dense phase zone and the upper riser are connected with each other transitionally; a separation zone located in an upper portion of the fluidized bed reactor and comprising a settling chamber, a fast gas-solid separator, a cyclone and a gas collecting chamber, wherein the upper riser extends upwardly into the separation zone and an outlet of the upper riser is connected with an inlet of the fast gas-solid separator, an outlet of the fast gas-solid separator is connected with an inlet of the cyclone via a fast gas passage, an outlet of the cyclone is connected with the gas collecting chamber, and the gas collecting chamber is located below a reactor outlet and connected with the reactor outlet; and a catalyst recycle line configured to recycle a catalyst from the settling chamber back to the lower dense phase zone, a catalyst withdrawal line configured to withdraw a deactivated catalyst from at least one of the settling chamber and the lower dense phase zone to a catalyst regenerator, and a catalyst return line configured to return a regenerated catalyst from the catalyst regenerator to the lower dense phase zone, wherein the fluidized bed reactor is suitable for producing an olefin from an oxygenate, the lower dense phase zone has a height to diameter ratio of from 0.5 to 10, the upper riser has a height to diameter ratio of from 2 to 20, a diameter ratio of the lower dense phase zone to the upper riser is from 2 to 10, and the fast gas passage is configured such that a stream resides in the fast gas passage for not more than 5 seconds.