摘要:
The present invention refers to a method and device for preparing propylene and C4 hydrocarbons from oxygen-containing compounds. The main characteristics of the method lie in that: returning 70 wt.% or more of the light fractions in the generated product to a dense phase zone of a fast fluidized-bed reactor from a reactor feed distributor at the bottom-most of the fast fluidized-bed reactor to react ethylene and the oxygen-containing compounds to perform an alkylation reaction in presence of a catalyst to produce products of propylene and the like, and circulating 80 wt.% or more of the hydrocarbons with 5 or more carbons into a catalytic cracking lift pipe to perform a cracking reaction to generate a product containing propylene and C4 hydrocarbons, which is subsequently fed into a dilute phase zone of the fast fluidized-bed reactor. The method and device of the present invention improve the reaction rate of ethylene alkylation, and the unit volume production capacity of reactor is high.
摘要:
Disclosed are a turbulent fluidized bed reactor, device and method for preparing para-xylene and co-producing light olefins from methanol and/or dimethyl ether and toluene, resolving or improving the competition problem between an MTO reaction and an alkylation reaction during the process of producing para-xylene and co-producing light olefins from methanol and/or dimethyl ether and toluene, and achieving a synergistic effect between the MTO reaction and the alkylation reaction. By controlling the mass transfer and reaction, competition between the MTO reaction and the alkylation reaction is coordinated and optimized to facilitate a synergistic effect of the two reactions, so that the conversion rate of toluene, the yield of para-xylene, and the selectivity of light olefins are increased. The turbulent fluidized bed reactor comprises a first reactor feed distributor and a plurality of second reactor feed distributors; the first reactor feed distributor and the plurality of second reactor feed distributions are sequentially arranged along the gas flow direction in a reaction zone of the turbulent fluidized bed reactor.
摘要:
The present invention refers to a turbulent fluidized-bed reactor, device and method for preparing propylene and C4 hydrocarbons from oxygen-containing compounds. The device comprises the turbulent fluidized-bed reactor and a fluidized-bed regenerator for regenerating a catalyst. The method includes: a) feeding a raw material containing the oxygen-containing compounds from n reactor feed distributors to a reaction zone of the turbulent fluidized-bed reactor, and contacting the raw material with a catalyst, to generate a stream containing target product and a spent catalyst containing carbon; b) sending the stream discharged from the turbulent fluidized-bed reactor containing target product into a product separation system, obtaining propylene, C4 hydrocarbons, light fractions and the like after separation, 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, and reacting ethylene and the oxygen-containing compounds to perform an alkylation reaction in presence of the catalyst, to produce products of propylene and the like. The method and device of the present invention improve the reaction rate of ethylene alkylation, and the unit volume production capacity of reactor is high.
摘要:
The present invention refers to a method and device for preparing propylene and C4 hydrocarbons from oxygen-containing compounds. By means of circulating 80 wt.% or more of the hydrocarbons with 5 or more carbons in the product into a catalytic cracking lift pipe to perform a cracking reaction to generate a product containing propylene and C4 hydrocarbons, the method improves the reaction rate of ethylene alkylation, and the unit volume production capacity of reactor is high.
摘要:
The present invention relates to a method for preparing a light olefin using an oxygen-containing compound, and a device for use thereof. More specifically, the present invention provides a method for preparing a light olefin using an oxygen-containing compound, taking methanol and/or dimethyl ether as main starting materials, using a multi-stage (n≥2) dense phase fluidized bed reactor and a multi-stage (m≥2) catalyst regenerator; the invention solves the problem in the prior art of the uniformity of catalyst carbon deposition and the carbon content being difficult to control and the light olefin selectivity being low.
摘要:
The present application discloses a molecular sieve-based catalyst modification apparatus. Said apparatus comprises a feeding unit 1, a modification unit 2 and a cooling unit 3 which are connected in sequence; the feeding unit comprises a catalyst feeding unit 11 and a modifier feeding unit 12, the catalyst feeding unit and the modifier feeding unit respectively introduce a catalyst and a modifier into the modification unit 2, and the catalyst and the modifier are discharged from the modification unit after sufficient reaction and enter the cooling unit 3 for cooling. The present application further discloses a use method for the molecular sieve-based catalyst modification apparatus. Said use method comprises: introducing, by means of the feeding unit 1, catalyst and modifier into the modification unit 2; after the catalyst is modified by the modifier in the modification unit 2, discharging the catalyst into the cooling unit 3; and after the temperature of the modified catalyst is lowered to a temperature of less than 50 °C in the cooling unit 3, outputting the cooled modified catalyst to an arbitrary material storage apparatus.
摘要:
Disclosed are a fast fluidized bed reactor, device and method for preparing para-xylene and co-producing light olefins from methanol and/or dimethyl ether and benzene, resolving or improving the competition problem between an MTO reaction and an alkylation reaction during the process of producing para-xylene and co-producing light olefins from methanol and/or dimethyl ether and benzene, and achieving a synergistic effect between the MTO reaction and the alkylation reaction. By controlling the mass transfer and reaction, competition between the MTO reaction and the alkylation reaction is coordinated and optimized to facilitate a synergistic effect of the two reactions, so that the conversion rate of benzene, the yield of para-xylene, and the selectivity of light olefins are increased. The fast fluidized bed reactor comprises a first reactor feed distributor and a plurality of second reactor feed distributors; the first reactor feed distributor and the plurality of second reactor feed distributions are sequentially arranged along the gas flow direction in a reaction zone of the fast fluidized bed reactor.