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
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[0040] figure 1 It is a schematic diagram of an embodiment of the reaction device used in the method of the present invention. detailed description
[0041] The present invention will be described in detail below in conjunction with the drawings, but the present invention is not limited to this.
[0042] Such as figure 1 As shown, the reaction device includes a first reactor 1 (ie, a DME reactor) and a second reactor 4 (ie, an MTP reactor). The first reactor 1 is provided with two catalyst beds in the longitudinal direction, The second reactor 4 is provided with six catalyst beds 5, wherein the methanol feed of the first reactor 1 is divided into two streams: after the first feed is preheated, the feed from the first reactor The top of the vessel 1 enters to carry out the strong exothermic reaction of methanol dehydration to synthesize dimethyl ether; the second feed is not preheated (for example, the second feed is kept at a temperature of 20°C to 40°C) and is sent to the The ...
Example Embodiment
[0048] Example 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 an industrial device for experiments, and the catalyst in the first reactor (ie DME reactor) is γ-Al 2 O 3 (Use Clariant Co., Ltd. DME-1 type catalyst), packed in two layers. The filling method of the catalyst in the second reactor is: uniformly mixing catalysts A and C with a mass ratio of 1:1 and filling them into the first to sixth catalyst beds of the second reactor.
[0050] Wherein, the methanol feed amount of the first reactor is 2.5 kg / h, and the total amount of the catalyst in the first reactor is 1.8 kg, and the reaction pressure is 0.8 MPa. The total filling amount of the catalyst in the second reactor is 2.5 kg, and the reaction pressure is 0.09 MPa.
[0051] After preheating 75 wt% of methanol feedstock to about 280°C, it enters from the top of the first reactor, and the remain...
Example Embodiment
[0053] Example 2
[0054] The difference from Example 1 is that the filling method of the catalyst in the second reactor is: catalyst A is filled from the uppermost layer of the catalyst bed of the second reactor to the lower barrier layer to the corresponding In the catalyst bed, the catalyst C is filled into the rest of the catalyst bed, and the mass ratio of catalyst A and C is 1:1. The experimental results are shown in Table 1.
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