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Method for preparing propylene from methanol

A technology for producing propylene and dimethyl ether from methanol is applied in the directions of producing hydrocarbons from oxygen-containing organic compounds, organic chemistry, etc., and can solve the problems of low reaction efficiency, complicated conversion reaction, easy coking and deactivation of catalysts, etc. The effect of improving the yield of propylene and reducing the generation of carbon deposits

Active Publication Date: 2014-08-13
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to increase the total yield of the target product propylene, it is necessary to recycle the hydrocarbons after the separation of ethylene and propylene back to the second-stage MTP reactor for further conversion, but the conversion reaction is very complicated, resulting in the ZSM-5 base in the second-stage adiabatic fixed-bed reactor. The catalyst is prone to coking and deactivation, requiring in-situ intermittent regeneration, resulting in low reaction efficiency

Method used

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  • Method for preparing propylene from methanol
  • Method for preparing propylene from methanol

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Experimental program
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specific Embodiment approach

[0041] The present invention will be described in detail below in conjunction with the accompanying drawings, but the present invention is not limited thereto.

[0042] Such as figure 1 As shown, the reaction unit comprises a first reactor 1 (i.e. a DME reactor) and a second reactor 4 (i.e. an MTP reactor), and the first reactor 1 is vertically provided with 2 catalyst beds, The second reactor 4 is provided with 6 catalyst beds 5, wherein, the methanol feed of the first reactor 1 is divided into two streams: after the first feed is preheated, from the first reaction The top of device 1 enters to carry out the strong exothermic reaction of methanol dehydration to dimethyl ether; the second feed is sent to the Between the two catalyst beds in the first reactor 1, it is mixed with the reaction product of the first feed, absorbs the heat released by the strong exothermic reaction, and continues the reaction of synthesizing methanol from dimethyl ether.

[0043] The first product...

Embodiment 1

[0049] In order to evaluate the rationality of the new process based on methanol to propylene, such as figure 1 The shown model test device simulates the process conditions of industrial devices for experiments, wherein the catalyst in the first reactor (ie DME reactor) is γ-Al 2 o 3 (Select the DME-1 catalyst of Clariant Co., Ltd.), and fill in two layers. The catalyst filling method in the second reactor is as follows: uniformly mix catalysts A and C with a mass ratio of 1:1 and then fill them into the first to sixth catalyst beds of the second reactor.

[0050] Wherein, the feed amount of methanol to the first reactor is 2.5kg / h, and the total amount of catalyst loaded in the first reactor is 1.8kg, and the reaction pressure is 0.8MPa. The total amount of catalyst loaded in the second reactor is 2.5kg, and the reaction pressure is 0.09MPa.

[0051] After preheating 75wt% methanol raw material to about 280°C, it enters from the top of the first reactor, and the remaining ...

Embodiment 2

[0054] The difference from Example 1 is that the filling method of the catalyst in the second reactor is: the catalyst A is filled from the uppermost layer in the catalyst bed of the second reactor to the lower interlayer to the corresponding Catalyst bed, catalyst C is packed into the rest of the catalyst bed, and the mass ratio of catalysts A and C is 1:1. The experimental results are shown in Table 1.

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Abstract

The invention discloses a method for preparing propylene from methanol. The method comprises the step of utilizing a first reactor and a second reactor to carry out reaction for preparing propylene from methanol, wherein the first reactor is used for carrying out reaction for synthesizing dimethyl ether with methanol so as to obtain a first product flow; the second reactor is used for carrying out reaction for preparing propylene with the first product flow so as to obtain a second product flow; a plurality of catalyst bed layers are longitudinally arranged in the second reactor and are filled with first catalysts and second catalysts; the second product flow is separated to obtain circulating hydrocarbon product flows containing C2, C4, C5 and C6; and the circulating hydrocarbon product flows are sent into the second reactor again. By adopting the method, by filling two kinds of catalysts with different acidity in the reactors, the circulating hydrocarbon is partially subjected to catalytic pyrolysis on the catalyst bed layer with stronger acidity, meanwhile, secondary reactions undergone by olefin molecules, such as hydrogen transfer, aromatization and the like to generate alkane and macromolecular aromatic hydrocarbon are reduced and the yield of propylene is increased.

Description

technical field [0001] The invention belongs to the field of methanol-to-propylene, in particular to a method for catalyst filling and reactor feeding in methanol-to-propylene. Background technique [0002] Ethylene and propylene are important petrochemical basic raw materials, and the annual demand is huge. In particular, propylene is currently the second largest chemical in the world, and its consumption has increased significantly, even surpassing ethylene. So far, propylene still mainly comes from the light oil cracking / cracking process in petroleum processing, and is obtained as co-products or by-products. are greatly restricted. In view of my country's energy structure rich in coal, poor in oil, and low in gas, the catalytic conversion of methanol to propylene technology has good application prospects and far-reaching strategic significance. [0003] At present, there are many reports on the process of producing low-carbon olefins from methanol, mainly including the ...

Claims

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Application Information

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IPC IPC(8): C07C11/06C07C1/20
Inventor 张伟罗春桃雍晓静张堃王峰关翀李云齐静
Owner CHNA ENERGY INVESTMENT CORP LTD
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