Method for preparing propylene from methanol

A technology for producing propylene and methanol from methanol, which is applied in chemical instruments and methods, hydrocarbon production from oxygen-containing organic compounds, chemical recovery, etc., can solve problems such as difficult control of reactor temperature, achieve high efficiency, reduce reaction types, The effect of reducing the exotherm of the reaction

Active Publication Date: 2016-04-27
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for producing propylene from methanol to solve the problem that the reactor temperature is not easy to control in the prior art

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 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 in the second reactor is A, which is evenly packed in the first to sixth catalyst beds of the second reactor. Wherein, the feed amount of fresh 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.

[0053] Fresh methanol is mixed with methanol from the top of the second distillation tower, wherein 50 wt% of the total amount of methanol is preheated to about 250 ° C, and enters from the top of the first reacto...

Embodiment 2

[0056] The difference from Example 1 is that the filling method of the catalyst in the second reactor is: the catalysts A and C with a mass ratio of 1:1 are evenly mixed and filled into the second reactor of the second reactor. One to sixth catalyst beds. The experimental results are shown in Table 1.

Embodiment 3

[0058] 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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PUM

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Abstract

The invention discloses a method for preparing propylene from methanol. The method comprises the steps: a reaction for preparing dimethyl ether from methanol is performed with a first reactor, to obtain a first product flow including dimethyl ether, water and unreacted methanol; the first product flow is separated with a separation device, the separated methanol returns to the first reactor, and the separated dimethyl ether and water are sent into a second reactor; a reaction for preparing propylene from dimethyl ether is performed with the second reactor, to obtain a second product flow; and the second product flow is separated to obtain a cyclic hydrocarbon product flow comprising C2, C4, C5 and C6 components, and the cyclic hydrocarbon product flow is anew sent back to the second reactor. The methanol in the first product flow returns to the first reactor, so that a catalyst bed layer is easier to control, and the risk of catalyst sintering is reduced; and at the same time, the reaction types in the second reactor are reduced, so as to be more conducive to high-efficiency effect of a catalyst.

Description

technical field [0001] The invention belongs to the field of producing propylene from methanol, and in particular relates to a method for producing propylene from methanol which can well control the temperature. Background technique [0002] Propylene is the most important basic organic raw material next to ethylene. With the year-by-year expansion of the application field of its derivatives, the demand is increasing day by day. According to the "Twelfth Five-Year Development Plan of Olefin Industry", it is predicted that by 2015, the demand for propylene equivalent in my country will be about 28 million tons per year, but the production capacity will only be 24 million. tons per year, the domestic propylene market will be in short supply for a long time. On the other hand, there is a lack of domestic petroleum resources, so it is urgent to develop a non-petroleum-based propylene production process. Propane dehydrogenation to propylene and ethylene and butene disproportiona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20C07C11/06
CPCY02P20/582C07C1/20C07C2529/40C07C2529/48
Inventor 王峰雍晓静罗春桃
Owner CHNA ENERGY INVESTMENT CORP LTD
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