Two-section preparation process of propylene

A preparation process, two-stage technology, applied in ethylene production, hydrocarbon cracking, hydrocarbon production, and hydrocarbon production from oxygen-containing organic compounds, etc., can solve unfavorable catalyst stability performance, catalyst carbon deposition deactivation, difficult to remove reaction heat, etc. problems, to achieve the effect of reducing equipment investment and operating costs, reducing consumption, and simplifying the process

Active Publication Date: 2012-09-19
CHAMBROAD CHEM IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of low-carbon olefins by methanol is a strong exothermic reaction. A large amount of heat of reaction is generated in the process of generating low-carbon olefins, and the heat of reaction is difficult to remove. A large amount of water is required as a diluent, resulting in high operating costs; Existence will lead to catalyst carbon deposition and deactivation too fast, which is not conducive to the stability of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A two-stage preparation process for propylene, using methanol and refinery carbon tetraolefins as raw materials, water as a diluent, prepared in a two-stage fixed-bed reactor; the catalyst in the first-stage fixed-bed reactor contains mass fraction It is a catalyst of 70% ZSM-5 molecular sieve, and the catalyst in the second fixed-bed reactor is a ZSM-5 molecular sieve catalyst modified by magnesium element, containing 70% ZSM-5 molecular sieve and 0.1% magnesium by mass fraction element, and the magnesium element is derived from magnesium oxide. Among them, the silicon-aluminum molar ratio of the ZSM-5 molecular sieve is 260, and the grain size is 1.5 μm.

[0026] Specific steps include:

[0027] (1) The mixture of methanol and water is reacted through the first fixed-bed reactor equipped with a catalyst to obtain a reaction mixture flow of dimethyl ether, methanol and water;

[0028] (2) The reaction mixture flow obtained in step (1) is mixed with carbon tetraolefin...

Embodiment 2

[0031] A two-stage preparation process for propylene. The catalyst in the second-stage fixed-bed reactor is a magnesium-modified ZSM-5 molecular sieve catalyst containing 2% magnesium by mass fraction. Other process parameters and steps are as described in the examples 1 described.

Embodiment 3

[0033] A two-stage preparation process for propylene. The catalyst in the second-stage fixed-bed reactor is a magnesium-modified ZSM-5 molecular sieve catalyst containing 4% magnesium by mass fraction. Other process parameters and steps are as described in the examples 1 described.

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PUM

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Abstract

The invention discloses two-section preparation process of propylene. Methanol and refinery carbon teterolefin are used as raw materials, water is used as a diluent, and a two-section fixed bed reactor is adopted for preparation. Catalyst in the first section of the fixed bed reactor contains 50%-85% ZSM-5 molecular sieve, and catalyst in the second section of the fixed bed reactor is magnesium element modified ZSM-5 molecular sieve catalyst. By means of the two-section preparation process of the propylene, water amount in the diluent is reduced, operation temperature is reduced, propylene selectivity and P/E ratio are effectively improved, conversion rate of the raw material methanol can reach as high as 100%, conversion rate of the refinery carbon teterolefin can reach above 85%, and one-way selectivity of propylene can reach as high as 50%.

Description

technical field [0001] The invention relates to a two-stage preparation process of propylene, in particular to a process for preparing propylene by coupling methanol with refinery C4-olefins. Background technique [0002] In the current prior art, there are mainly two processes for preparing propylene from methanol: MTO technology and MTP technology. Compared with MTO technology, MTP technology uses a fixed-bed reactor, which is easy to scale up, has low risk, and has great confidence in industrialization. At the same time, the by-product market is gasoline, liquefied petroleum gas and fuel gas with a large capacity, which has high economic benefits . However, the preparation of low-carbon olefins by methanol is a strong exothermic reaction, and a large amount of heat of reaction is generated in the process of generating low-carbon olefins. The heat of reaction is difficult to remove, and a large amount of water is required as a diluent, resulting in high operating costs; ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C11/04C07C1/20C07C4/06
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 牟庆平郭振莲张建林马韵升史庆苓栾波
Owner CHAMBROAD CHEM IND RES INST CO LTD
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