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Device for preparing methanol into propylene

A technology for producing propylene and methanol from methanol, applied in chemical instruments and methods, ether preparation, sustainable manufacturing/processing, etc., can solve the problems of increasing C4 cycle energy consumption and heater load, affecting propylene yield, and olefin waste, etc. Achieve the effects of efficient temperature control and stability, increase olefin content, and reduce fluctuations in propylene yield

Active Publication Date: 2019-07-26
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of high content of alkanes, the energy consumption of C4 cycle and the load of heater will be increased; on the other hand, it is sold as LPG mixture material, which also causes waste of olefins
In fact, the content of isobutane and n-butane in circulating C4 hydrocarbons does not participate in the reaction, so the content is too high, which seriously affects the yield of propylene

Method used

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  • Device for preparing methanol into propylene
  • Device for preparing methanol into propylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] use as figure 1 Experiments are carried out in the simulated device shown, wherein the catalyst in the first reactor 101 (i.e. DME reactor) is γ-Al 2 o 3 (Select the DME-1 catalyst of Clariant Co., Ltd.), and fill in two layers. The second reactor 102 is provided with five layers of catalyst beds 9, and the catalysts are evenly packed into the first to fifth catalyst beds of the second reactor 102, wherein the distance between the catalyst beds is from the upper right to The lower gradually increases (the distance between any intermediate catalyst bed and the adjacent catalyst bed below it is 1.1 times the distance between the adjacent catalyst bed above it).

[0061]Wherein, the feed amount of fresh methanol to the first reactor 101 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. After the fresh methanol accounting for 60wt% of the total amount is preheated to about 270°C, it enters from the top...

Embodiment 2

[0065] The difference from Example 1 is that in the first product stream obtained, the first product stream accounting for (10±1)wt% is transported through the second feed pipe 4, and the first product flow accounting for (57±1)wt% The first product stream is conveyed through the third conveying pipe 3 and the remainder is conveyed through the first conveying pipe 5 . The temperature of the liquid phase from the separation column 107 is further controlled at 55±2°C. At the same time, the distance between any intermediate catalyst bed in the second reactor 102 and the adjacent catalyst bed below it is 1.2 times the distance between the adjacent catalyst bed above it. The experimental results are shown in Table 1.

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Abstract

The invention discloses a device for preparing methanol into propylene. The device comprises a first reactor, a first material conveying pipe, a second material conveying pipe, a third material conveying pipe, a cooling unit, a dimethyl ether separation tower, a heating furnace, a second reactor, a separation unit, a C4 rectifying tower, a circulating hydrocarbon pipeline and a steam pipeline. Theinvention further discloses a corresponding method for preparing methanol into propylene. Isobutane is separated from circulating hydrocarbons, and a first product stream obtained by carrying out thereaction for preparing methanol into dimethyl ether in the first reactor is divided into three streams, so that the temperature flying phenomenon of the reactor can be reduced through dispersed feeding matched with different temperatures, and meanwhile, the high-efficiency temperature control of the reactor can be facilitated by adjusting the gas-liquid ratio fed from a side line.

Description

technical field [0001] The invention relates to the field of producing propylene from methanol, in particular to a device and method for producing propylene from methanol that can effectively increase the yield of propylene. Background technique [0002] Propylene is the most important basic organic raw material next to ethylene. With the expansion of the application field of its derivatives year by year, the demand is increasing day by day, but the petroleum resources are becoming increasingly scarce, so it is urgent to develop a non-petroleum-based propylene preparation process. At present, the production of methanol from coal / natural gas has entered large-scale production. MTO / MTP has the advantages of wide range of raw materials and low cost, and is suitable for my country's national conditions of rich coal and poor oil. [0003] The process of methanol to propylene (MTP) is that under the action of a catalyst, the mixed gas generated by the chemical reaction of the dim...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C11/06C07C9/12C07C11/08
CPCC07C1/20C07C41/09C07C2529/40C07C11/06C07C43/043C07C9/12C07C11/08Y02P20/10
Inventor 魏旭礼郭中山王峰杜正平梁吉宝
Owner CHNA ENERGY INVESTMENT CORP LTD
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