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Method for preparing propylene by cracking C4 olefin added with methanol and/or dimethyl ether

A technology for adding methanol and dimethyl ether, which is applied to hydrocarbon cracking to produce hydrocarbons, ethylene production, and hydrocarbon production from oxygen-containing organic compounds, etc. high yield effect

Inactive Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the defects existing in the prior art, the object of the present invention is to provide a method for producing propylene by cracking C4 olefins by adding methanol and / or dimethyl ether. The temperature drop problem of the reaction system

Method used

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  • Method for preparing propylene by cracking C4 olefin added with methanol and/or dimethyl ether
  • Method for preparing propylene by cracking C4 olefin added with methanol and/or dimethyl ether
  • Method for preparing propylene by cracking C4 olefin added with methanol and/or dimethyl ether

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Experimental program
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Effect test

Embodiment 1

[0063] The preparation of embodiment 1 catalyst

[0064] Get the water glass 156g that modulus is 3.6 and dissolve in 50g water. Another Al with a content of 99% 2 (SO 4 ) 3 .18H 2 O (aluminum sulfate octadecahydrate) 2g, then mix with the concentrated sulfuric acid of 98% and 75mL water with 13g content. The two solutions were mixed under vigorous stirring, and 50 g of 10% tetrapropylammonium hydroxide template was added, and the stirring was continued to make a uniform gel. Transfer the gel-like mixture into a stainless steel crystallizer, seal it, and crystallize at 180°C for 50 hours. After the crystallization is completed, the product is cooled rapidly, the mother liquor is poured out, the precipitate is separated by centrifugation, and washed several times with pure water until the pH value of the solution is 8-9, and then the obtained crystal is dried at 120°C for 12 hours, 550 The templating agent was removed by calcining at ℃ for 5 hours to obtain ZSM-5 molecula...

Embodiment 2

[0069] On the continuous flow fixed bed reactor, the catalyst A1g prepared in Example 1 was loaded. Under normal pressure, with air, the catalyst was calcined at 500 °C for 2 hours, and then switched to N 2 Purge for 0.5 hours. 1-butene and dimethyl ether are raw materials, the two are fed in a molar ratio of 5:1, and the weight space velocity is 3h -1 , with N 2 It is a diluent gas (acting as a carrier gas), the molar ratio of the diluent gas to the raw material is 3, and the reaction temperature is 500°C. Table 1 shows the results of the cracking reaction of 1-butene with dimethyl ether as part of the feed.

[0070] Compared with Comparative Example 1, when part of dimethyl ether was added as a co-feed, the temperature change of the reactor was reduced, which effectively alleviated the decrease in the reactor temperature caused by the endothermic reaction when C4 olefins were cracked alone. At the same time, the addition of dimethyl ether also has a certain promoting eff...

Embodiment 3

[0076] On the continuous flow fixed bed reactor, the catalyst A1g prepared in Example 1 was loaded. Under normal pressure, with air, the catalyst was calcined at 500 °C for 2 hours, and then switched to N 2 Purge for 0.5 hours. 1-butene and dimethyl ether are raw materials, the two are fed in a molar ratio of 5:1, and the weight space velocity is 3h -1 , with N 2 It is diluent gas, the molar ratio of diluent gas to raw material is 3, and the experimental results when the reaction temperature is 480°C and 520°C are shown in Table 2. Experimental result shows, compare with embodiment 1, reaction temperature drops to 480 ℃ or rises to 520 ℃, although the content of target product ethylene, propylene has certain change, and comparative example 1 all increases to some extent, shows that adding A certain amount of dimethyl ether as a co-feed is beneficial to promote the formation of ethylene and propylene.

[0077] Table 2 DME as co-feeding 1-butene reaction results

[0078] ...

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Abstract

The invention relates to a method for preparing propylene by cracking C4 olefin added with methanol and / or dimethyl ether. In a process of preparing the propylene by cracking the C4 olefin, methanol and / or dimethyl ether is added to be common feeding material, reaction thermal released by a methanol and / or dimethyl ether cracking process can be supplied to a C4 olefin cracking process absorbing heat, and the problem that heat supply of a system is insufficient as heat is absorbed in the C4 cracking process can be effectively solved. The method for preparing the propylene by cracking the C4 olefin added with methanol and / or dimethyl ether is beneficial to improving stability of a reaction system and can ensure a reaction to be easier to operate in a project.

Description

technical field [0001] The invention relates to a method for producing low-carbon olefins with propylene as the main product, in particular to a method for producing propylene by cracking C4 olefins by adding methanol and / or dimethyl ether. Background technique [0002] With the rapid development of my country's oil refining industry and the continuous expansion of the production capacity of the ethylene industry, C4 hydrocarbon resources as petrochemical by-products are also increasing. Facing the current shortage of oil resources in our country, how to use this part of C4 hydrocarbon resources and improve the utilization rate of resources has a huge impact on the economic benefits of petrochemical enterprises. [0003] Propylene is an important organic chemical raw material. With the rapid growth of demand for polypropylene and other derivatives, the demand for propylene is also increasing year by year. At present, 66% of the world's propylene comes from steam cracking to...

Claims

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Application Information

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IPC IPC(8): C07C11/06C07C4/06C07C1/20
CPCY02P30/20Y02P30/40
Inventor 张飞张明森张新元
Owner CHINA PETROLEUM & CHEM CORP
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