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Process for producing propylene by using alcohol-hydrocarbon co-refining technology

A technology of co-refining and propylene, applied in ethylene production, biological raw materials, hydrocarbon cracking to produce hydrocarbons, etc., can solve problems such as affecting product distribution, affecting the stability of reactor temperature, etc., to reduce the difficulty of heat exchange, improve added value, The effect of promoting generation

Inactive Publication Date: 2014-04-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strong thermal effect reaction puts forward higher requirements on the heat exchange of the device, and a large amount of exothermic or endothermic heat may affect the stability of the reactor temperature, thereby affecting the product distribution of the reaction

Method used

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  • Process for producing propylene by using alcohol-hydrocarbon co-refining technology
  • Process for producing propylene by using alcohol-hydrocarbon co-refining technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Choose phosphorus-modified ZSM-5 as a catalyst, and the preparation method is as follows:

[0035]The required raw materials are HZSM-5 molecular sieve (Si:Al=50) and phosphoric acid aqueous solution, and the ZSM-5 molecular sieve catalyst containing 2% phosphorus is obtained by spray drying, and additives can be added as appropriate during the preparation process. The above-mentioned raw materials and additives can be obtained by purchasing commercial products, and the HZSM-5 molecular sieve can also be prepared according to the method disclosed in the literature (Molecular Sieve and Porous Material Chemistry, Xu Ruren, Science Press).

[0036] The co-refining reaction zone is composed of two fluidized beds connected in series. The temperature inside the first reactor is 530°C, the pressure is 0.18Mpa, and the mass space velocity is 3h -1 ; The temperature in the second reactor is 470℃, the pressure is 0.16MPa, and the mass space velocity is 1h -1 . C 4 The distill...

Embodiment 2

[0039] Phosphorus-magnesium modified ZSM-5 is a catalyst, and the preparation method is as follows:

[0040] The required raw materials are HZSM-5 molecular sieve (Si:Al=50), binder, phosphoric acid, magnesium nitrate aqueous solution, mix HZSM-5 molecular sieve and binder at a ratio of 3:1, and obtain strips by extrusion molding method Shaped HZSM-5 molecular sieve, and the ZSM-5 catalyst containing 1% phosphorus and 2% magnesium was obtained by impregnation method, and additives can be added as appropriate during the preparation process.

[0041] The co-refining reaction zone is composed of two parallel fixed beds. The temperature in both reactors is 500°C, the pressure is 0.18Mpa, and the mass space velocity is 1.5h -1 . C 4 The distillates are mixed with methanol and water vapor in a mass ratio of 1:1:4 and then injected from the inlets of the two reactors respectively. The mass ratio of methanol injected from the inlet to the middle is 2:1. All the rest are carried o...

Embodiment 3

[0044] Select high-silicon HZSM-5 (Si:Al=200) as the catalyst, and the preparation method is as follows:

[0045] The required raw material is high-silicon HZSM-5 molecular sieve (Si:Al=200), and the spherical high-silicon HZSM-5 molecular sieve catalyst is obtained by rotational molding method, and additives can be added as appropriate during the preparation process. The above-mentioned raw materials and additives can be obtained by purchasing commercial products, and the HZSM-5 molecular sieve can also be prepared according to the method disclosed in the literature (Molecular Sieve and Porous Material Chemistry, Xu Ruren, Science Press).

[0046] A moving bed constitutes a co-refining reaction zone. The temperature in the reactor is 490°C, the pressure is 0.18Mpa, and the mass space velocity is 1h -1 . C 4 The distillate is mixed with methanol and steam at a mass ratio of 3:5:10 for heat exchange and then injected from the inlet of the reactor. All the rest are carried o...

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Abstract

The invention discloses a process for producing propylene by using an alcohol-hydrocarbon co-refining technology. The process comprises the steps of (1) introducing a raw gas consisting of methanol and / or dimethyl ether, and C4 or C4 / C5 cut fractions and diluent gas into a co-refining reaction zone to have a co-refining reaction in contact with a catalyst, thereby obtaining a co-refining reaction product; and (2) putting the co-refining reaction product obtained in the step (1) and a product of an oil refining device or ethylene unit into a separation zone, performing dehydration and oxide removal, and then separating to obtain a product namely propylene and other hydrocarbon byproducts, wherein the C4 and C5 cut fractions in the hydrocarbon byproducts are returned to the co-refining reaction zone after crude separation. According to the process disclosed by the invention, methanol and / or dimethyl ether and C4 or C4 / C5 cut fractions are subjected to co-refining, so that a strong thermal effect existing in separate reactions of the two components is effectively neutralized, and the heat exchange difficulty is reduced; the separation zone is shared by the process and the oil refining device or ethylene unit, so that integrated production is realized, the added values of the C4 or C4 / C5 cut fractions of the oil refining device or ethylene unit are improved.

Description

technical field [0001] The invention relates to the technical field of propylene production, in particular to a process for producing propylene by utilizing alcohol-hydrocarbon co-refining technology. Background technique [0002] With the rapid growth of market demand for propylene and the dwindling of cheap and easy-to-recover oil resources, countries around the world are actively developing new technologies for the production of low-carbon olefins and broadening the source of raw materials for the production of low-carbon olefins. At present, the starting materials of propylene are mainly concentrated in crude oil and its derivatives. The continued high international oil price will inevitably push up the production cost of propylene. The search for alternative raw materials to produce propylene has become a research hotspot. [0003] With the rise of coal chemical industry and natural gas chemical industry, methanol production capacity is sufficient and the price is low. ...

Claims

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Application Information

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IPC IPC(8): C07C11/06C07C1/20C07C4/06
CPCY02P30/20Y02P30/40
Inventor 蒋斌波王中仁廖祖维黄正梁王靖岱阳永荣季来军蒋云涛严丽霞陆飞鹏冯翔
Owner ZHEJIANG UNIV
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