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Method for preparing propylene by using methanol

A technology for preparing propylene and methanol from methanol is applied in chemical instruments and methods, purification/separation of hydrocarbons, and hydrocarbon production from oxygen-containing organic compounds. Achieve increased selectivity and yield, extended operating cycle, and reduced alkyne and diolefin content

Active Publication Date: 2015-04-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that when the by-product hydrocarbon cycle is used to improve the selectivity of propylene in the prior art, the regeneration cycle of the methanol-to-propylene catalyst is short, and the hydrogenation of the by-product hydrocarbon cycle has the problems of difficult stable temperature control and large investment. , providing a new method for producing propylene from methanol

Method used

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  • Method for preparing propylene by using methanol
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Embodiment 1

[0032] according to figure 2 As shown, the reaction of methanol to propylene uses ZSM-5 catalyst, the reaction pressure is 0.1MPa(G), the reaction inlet temperature is 450°C, the mass flow ratio of dilution steam 08 and feed 01 is 0.9, and the obtained C 2 and the following logistics and C 4 ~C 5 85% of the flow is recycled back to the reactor; the tower pressure of the depropanizer 23 is 1.5MPa (G), and the reflux ratio is 1.0. The hydrogenation catalytic reaction zone adopts a nickel-based catalyst, and the reaction zone temperature is 55~65°C. Hydrogen 21 to ensure that the molar ratio of hydrogen to alkynes and dienes in feed 01 is 1.25, and the reaction weight space velocity is 15 hours -1 , Feed 01 contained 360ppm oxygenates and less than 1ppm water. Feed stream 01 composition (weight %) is: 20% methanol, 57.5% dimethyl ether, 22.5% water; 4 ~C 5 The composition of stream 26 (% by weight): 74.6% C 4 (excluding alkynes and dienes), 25.4% C 5 (excluding alkynes an...

Embodiment 2

[0034] according to figure 2 As shown, the reaction of methanol to propylene uses ZSM-5 catalyst, the reaction pressure is 0.1MPa(G), the reaction inlet temperature is 450°C, the mass flow ratio of dilution steam 08 to feed 01 is 0.9, and the obtained C 2 and the following logistics and C 4 and 85% of the above stream is recycled to the reactor; the tower pressure of the depropanizer 23 is 1.0MPa (G), the hydrogenation catalytic reaction zone adopts a nickel-based catalyst, the temperature of the reaction zone is 60~70°C, and hydrogen gas 21 is added. Ensure that the molar ratio of hydrogen to alkynes and dienes in feed 01 is 1.2, and the reaction weight space velocity is 12 hours -1, Feed 01 contained 360ppm oxygenates and less than 1ppm water. Feed stream 01 composition (weight %) is: 20% methanol, 57.5% dimethyl ether, 22.5% water; 4 ~C 5 The composition (% by weight) of stream 26 is: 74.6% C 4 (excluding alkynes and dienes), 25.4% C 5 (excluding alkynes and dienes),...

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Abstract

The invention relates to a method for preparing propylene by using methanol, mainly aiming at solving the problems that the regeneration cycle of catalyst for preparing the propylene by using the methanol is short, the hydrogenation reaction temperature is uneasy to control and the equipment investment is great in the prior art. The technical scheme is that the method comprises the following steps that: a) raw materials I containing the methanol enter a reactor to be in contact and react with the catalyst for preparing the propylene by using the methanol to produce a material flow II containing the propylene; b) the material flow II is chilled through a chilling system to obtain a gas material flow III, liquid heavy hydrocarbon and process water, the liquid heavy hydrocarbon is discharged outside and at least part of the process water is returned to the reactor; c) the material flow III enters the upper part of the hydrogenation reaction area of a depropanizing tower, a C3 and below-C3 material flow IV is obtained at the top of the tower, a C4 and above-C4 material flow V is obtained at the bottom of the tower, and at least part of the material flow V is returned to the reactor; and d) the material flow IV enters a C2 / C3 separation tower, a C2 and below-C2 material flow VI is obtained at the top of the tower, at least part of the material flow VI is returned to the reactor and C3 fractions are obtained at the bottom of the tower. By adopting the technical scheme, the problems are better solved and the method can be used for the industrial production of the propylene by using the methanol.

Description

technical field [0001] The invention relates to a method for preparing propylene from methanol, in particular to a catalytic distillation hydrogenation process for preparing propylene from methanol. Background technique [0002] Propylene is one of the basic raw materials of modern organic chemical industry. Due to the increasing demand for propylene derivatives such as polypropylene, acrylonitrile, cumene, and propylene oxide, the corresponding demand for propylene is also growing rapidly. At present, ethylene and propylene are mainly obtained through the process route using petroleum as raw material, while propylene mainly comes from the by-product of petroleum steam cracking process and catalytic cracking process. Since propylene is mainly obtained as a by-product, the output of propylene product is often limited by the output of the main product of its process. Since the demand for propylene has been higher than that of ethylene in recent years, in order to produce or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/06C07C1/20C07C7/163C07C7/167
CPCY02P20/584
Inventor 胡春胡帅李俊杰何志黄云群
Owner CHINA PETROLEUM & CHEM CORP