Method and device for manufacturing propene and c4 hydrocarbon

A device for preparing propylene and C4 hydrocarbons from oxygen-containing compounds, comprising:

• a turbulent fluidized-bed reactor, the turbulent fluidized-bed reactor comprises a reactor shell, one or more reactor feed distributors, a first reactor gas-solid separator, a second reactor gas-solid separator, a reactor heat extractor, a product gas outlet and a reactor stripper, wherein the lower part of the turbulent fluidized-bed reactor is a reaction zone, the upper part of the turbulent fluidized-bed reactor is a settling zone, the one or more reactor feed distributors are disposed in the reaction zone, the reactor heat extractor is disposed in the reaction zone, the first reactor gas-solid separator and the second reactor gas-solid separator are placed in the settling zone or outside the reactor shell, the inlet of the first reactor gas-solid separator is connected to a regenerated catalyst lift pipe, the catalyst outlet of the first reactor gas-solid separator is located at the bottom of the reaction zone, the gas outlet of the first reactor gas-solid separator is located in the settling zone, the inlet of the second reactor gas-solid separator is located in the settling zone, the catalyst outlet of the second reactor gas-solid separator is placed in the reaction zone, the gas outlet of the second reactor gas-solid separator is connected to the product gas outlet, and the reactor stripper passes through the reactor shell from outside to inside at the bottom of the turbulent fluidized-bed reactor and is opened in the reaction zone of the turbulent fluidized-bed reactor;
• a catalytic cracking lift pipe, the bottom of the catalytic cracking lift pipe is connected to the outlet of a catalytic cracking inclined pipe and is provided with a hydrocarbons with 5 or more carbons inlet, and the outlet of the catalytic cracking lift pipe is connected to the settling zone of the turbulent fluidized-bed reactor;
• and
• a fluidized-bed regenerator, the fluidized-bed regenerator comprises a regenerator shell, a regenerator feed distributor, a regenerator gas-solid separator, a regenerator heat extractor, a flue gas outlet and a regenerator stripper, wherein the lower part of the fluidized-bed regenerator is a regeneration zone, the upper part of the fluidized-bed regenerator is a settling zone, the regenerator feed distributor is placed at the bottom of the regeneration zone, the regenerator heat extractor is placed in the regeneration zone, the regenerator gas-solid separator is placed in the settling zone or outside the regenerator shell, the inlet of the regenerator gas-solid separator is disposed in the settling zone, the catalyst outlet of the regenerator gas-solid separator is disposed in the regeneration zone, the gas outlet of the regenerator gas-solid separator is connected to the flue gas outlet, and the regenerator stripper is opened at the bottom of the regenerator shell;
• wherein, the bottom of the reactor stripper is provided with a reactor stripping gas inlet, the bottom of the reactor stripper is connected to the inlet of a inclined spent catalyst pipe, a spent catalyst sliding valve is arranged in the inclined spent catalyst pipe, the outlet of the inclined spent catalyst pipe is connected to the inlet of a spent catalyst lift pipe, the bottom of the spent catalyst lift pipe is provided with a spend catalyst lifting gas inlet, and the outlet of the spent catalyst lift pipe is connected to the settling section of the fluidized-bed regenerator;
• the bottom of the regenerator stripper is provided with a regenerator stripping gas inlet, the bottom of the regenerator stripper is connected to the inlet of a inclined regenerated catalyst pipe, a regenerated catalyst sliding valve is arranged in the inclined regenerated catalyst pipe, the outlet of the inclined regenerated catalyst pipe is connected to the inlet of the regenerated catalyst lift pipe, the bottom of the regenerated catalyst lift pipe is provided with a regenerated catalyst lifting gas inlet, and the outlet of the regenerated catalyst lift pipe is connected to the inlet of the first reactor gas-solid separator;
• the bottom of the regenerator stripper is further connected to the inlet of the catalytic cracking inclined pipe, and a catalytic cracking sliding valve is arranged in the catalytic cracking inclined pipe.

A method for preparing propylene and C4 hydrocarbons from oxygen-containing compounds, including:

• feeding a raw material containing an oxygen-containing compound from n reactor feed distributors to a reaction zone of a turbulent fluidized-bed reactor, and contacting the raw material with a catalyst, to generate a stream containing propylene and C4 hydrocarbons product and a spent catalyst containing carbon;
• regenerating the spent catalyst by a fluidized-bed regenerator to form a regenerated catalyst, wherein a part of the regenerated catalyst is fed to the bottom of the reaction zone of the turbulent fluidized-bed reactor after being gas-solid separated by a reactor gas-solid separator 1, and another part of the regenerated catalyst is fed to a catalytic cracking lift pipe via a catalytic cracking inclined pipe;
• sending the stream discharged from the turbulent fluidized-bed reactor containing propylene and C4 hydrocarbons product into a product separation system, obtaining propylene, C4 hydrocarbons, light fractions, propane and hydrocarbons with 5 or more carbons after separation, wherein the light fractions contain more than 90 wt % of ethylene and a small amount of methane, ethane, hydrogen, CO and CO2, returning 70 wt. % or more of the light fractions to the reaction zone of the turbulent fluidized-bed reactor from the reactor feed distributor at the bottom-most of the turbulent fluidized-bed reactor to react ethylene and the oxygen-containing compounds to perform an alkylation reaction in presence of the catalyst to produce a product containing propylene, and retrieving less than 30 wt. % of the light fractions as a by-product;
• feeding 80 wt. % or more of the hydrocarbons with 5 or more carbons coming from the product separation system into the catalytic cracking lift pipe via a hydrocarbons with 5 or more carbons inlet, to contact cocurrent with the regenerated catalyst coming from the catalytic cracking inclined pipe to perform a cracking reaction to generate a stream containing propylene and C4 hydrocarbons and a carbon-containing catalyst, subsequently, feeding the stream containing propylene and C4 hydrocarbons and the carbon-containing catalyst into a settling zone of the turbulent fluidized-bed reactor via the outlet of the catalytic cracking lift pipe, and retrieving less than 20 wt. % of the hydrocarbons with 5 or more carbons as a by-product.