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A method for producing propylene from methanol

A technology for the production of propylene and methanol from methanol, which is applied in the direction of hydrocarbon production from oxygen-containing organic compounds, chemical recovery, organic chemistry, etc. It can solve the problems of difficult control of the reactor temperature, achieve high efficiency, reduce the risk of sintering, and reduce The effect of exothermic reaction

Active Publication Date: 2017-08-25
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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  • A method for producing propylene from methanol
  • A method for producing 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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Abstract

The invention discloses a method for producing propylene from methanol, which comprises: utilizing a first reactor to perform methanol-to-dimethyl ether reaction to obtain a first product stream; the first product stream includes dimethyl ether, water and unreacted Methanol; Utilize separation device to separate described first product flow, make separated methanol return to described first reactor, separated dimethyl ether and water send into second reactor; Utilize second reactor to carry out Dimethyl ether to propylene reaction to obtain a second product stream; the second product stream is separated to obtain a recycled hydrocarbon product stream comprising C2, C4, C5 and C6 components, and the recycled hydrocarbon product stream is returned to the Describe the second reactor. The invention returns the methanol in the first product flow to the first reactor, thereby making the catalyst bed easier to control and reducing the risk of catalyst sintering; meanwhile, reducing the types of reactions in the second reactor, which is more conducive to the high-efficiency effect of the 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 Patents(China)
IPC IPC(8): C07C1/20C07C11/06
CPCY02P20/582
Inventor 王峰雍晓静罗春桃
Owner CHNA ENERGY INVESTMENT CORP LTD
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