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Method for rapidly cooling reaction product of oxygen-containing compound produced alkene

A technology for producing olefins from reaction products, which is applied in the direction of producing hydrocarbons from oxygen-containing organic compounds, ethylene production, and biological raw materials. Scale, avoid equipment blockage, improve the effect of recycling

Active Publication Date: 2011-09-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that in the prior art, the quenched condensed water of the olefin reaction product produced by the oxygenated compound is likely to cause equipment blockage and corrosion during circulation and stripping, and it is difficult to recover the oxygenated compound and reuse the process water. To solve the problem, provide a new quenching method for the reaction products of oxygenates to olefins

Method used

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  • Method for rapidly cooling reaction product of oxygen-containing compound produced alkene
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  • Method for rapidly cooling reaction product of oxygen-containing compound produced alkene

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Embodiment 1

[0035] The reaction product feed composition (weight %) is: ethylene 15.0%, propylene 15.0%, water 60.5%, catalyst fine powder 2.0%, organic acid 200ppm, oxygen-containing compound 0.3%, other 7.2%, feed temperature 230 ℃. use figure 2 In the process flow shown, the number of spray layers in the lower section is 3, the installation angle α of the nozzles is 15°, and the arrangement of concentric circles is adopted. The theoretical number of towers for the middle packing is 2, and the theoretical number of towers for the upper packing is 5. The pressure of the quenching tower is 0.13MPag, and the lower section is quenched to 110°C (subcooling is about 10°C). After the tank liquid is withdrawn, 80% by weight of the catalyst is removed by liquid-solid separation equipment, and the ratio of circulating tank liquid volume / feed volume is 1 : 5; middle stage lye concentration is NaOH 8% by weight, and the ratio of circulating lye amount / feed amount is 1: 2, and the middle section te...

Embodiment 2

[0039] The reaction product feed composition (weight %) is: ethylene 15.0%, propylene 15.0%, water 60.5%, catalyst fine powder 2.0%, organic acid 200ppm, oxygen-containing compound 0.3%, other 7.2%, feed temperature 230 ℃. use image 3 In the process flow shown, the number of spraying layers in the lower section is 3, the installation angle α of the nozzles is 15°, and the arrangement of concentric circles is adopted. The pressure of the first quench tower is 0.14MPag, and the temperature at the top of the tower is 110°C (subcooling is about 10°C ), remove 80% by weight of the catalyst through liquid-solid separation equipment after the still liquid is extracted, and the ratio of circulating still liquid amount / feed amount is 1:5. The theoretical number of towers of the filler in the lower section of the second quenching tower is 2, the theoretical tower number of the filler in the upper section is 5, the concentration of the NaOH lye in the lower section is 8% by weight, and ...

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Abstract

The invention relates to a method for rapidly cooling a reaction product of an oxygen-containing compound produced alkene, which mainly solves problems that equipment blockage and corrosion are probably caused in the prior art, oxygen-containing compounds are difficult to recover and process water is difficult to reuse. The method comprises the following steps: a) providing a vapor-phase reactionproduct I of oxygen-containing compound produced alkene, which contains water, organic acid and fine catalyst powder; b) carrying out first-stage rapid cooling on the reaction product I to reach a temperature below the saturation temperature under operating pressure, wherein the supercooling temperature is no more than 25 DEG C; and removing the fine catalyst powder and the water contained in thereaction product I to obtain a primary rapid cooling alkene flow II, wherein the water accounts for no more than 35wt% of the reaction product I; c) washing with alkali to remove the organic acid in the alkene flow II, thus obtaining an alkene flow III with the organic acid removed; and d) carrying out second-stage rapid cooling on the alkene flow III to reach a temperature which is below the dewpoint of methanol and is no less than 30 DEG C, thus obtaining a secondary rapid cooling alkene flow IV, wherein the water content of the alkene flow IV is less than 5wt%. The technical scheme well solves the problems and can be used for the industrial production of oxygen-containing compound produced alkene.

Description

technical field [0001] The invention relates to a quenching method for producing olefin reaction products from oxygen-containing compounds, in particular to a quenching method for fluidized catalytic reaction products from methanol to olefins (MTO). Background technique [0002] At present, ethylene and propylene are mainly obtained through the process route using petroleum as raw material, ethylene is mainly produced through petroleum steam cracking process, and propylene is mainly produced from petroleum steam cracking process and catalytic cracking process. An alternative process route for the production of ethylene and propylene is to use coal or natural gas as feedstock with further conversion of oxygenates such as methanol. The use of molecular sieve catalysts to achieve this conversion is highly selective and suitable for use in fluidized bed reactors. During the catalytic production of ethylene and propylene, a large amount of by-product water and a small amount of o...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C11/06C07C1/20
CPCY02P30/20Y02P30/40
Inventor 谢在库胡春杨卫胜胡帅
Owner CHINA PETROLEUM & CHEM CORP
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