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Technology for preparing ethylene and propylene by catalytically cracking byproduct C4 material in coal to olefine

A catalytic cracking and coal-to-olefins technology, which is applied in the direction of physical/chemical process catalysts, hydrocarbon cracking to hydrocarbons, molecular sieve catalysts, etc., can solve the problems of reversible deactivation, ZSM-5 molecular sieve coking deactivation, skeleton collapse, etc., to achieve saving Effects of resources, good economy and operability

Inactive Publication Date: 2013-04-17
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the organic oxygen-containing compounds in the material can easily cause the ZSM-5 molecular sieve to coke and deactivate, resulting in reversible deactivation, and the water in the material can easily cause the ZSM-5 molecular sieve skeleton to collapse, resulting in permanent inactivation

Method used

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  • Technology for preparing ethylene and propylene by catalytically cracking byproduct C4 material in coal to olefine
  • Technology for preparing ethylene and propylene by catalytically cracking byproduct C4 material in coal to olefine

Examples

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Embodiment 1

[0036] The technology of embodiment 1 MTO by-product C4 material catalytic cracking to produce ethylene and propylene

[0037] This embodiment provides a process for the production of ethylene and propylene by catalytic cracking of MTO by-product carbon four materials, and its process flow is as follows figure 1 shown.

[0038] The flow rate of the C4 material used in this embodiment is 10 tons / h, the n-butene concentration in the C4 material is 90%, the water content is about 300ppm, and the content of organic oxygen-containing compounds such as methanol and dimethyl ether is about is 800ppm, and the remainder is butane.

[0039]The technique provided in this embodiment comprises the following steps:

[0040] Step a: Make the MTO by-product carbon four material pass through a 20m 3 In the dehydration reactor of 3A molecular sieve, the water content in the C4 material drops from 300ppm to 50ppm, and the material A is obtained;

[0041] Step b: Make material A enter the rea...

Embodiment 2

[0045] The technology of embodiment 2 MTP by-product C4 material catalytic cracking to produce ethylene and propylene

[0046] This embodiment provides a process for the production of ethylene and propylene by catalytic cracking of MTP by-product C4 material, and its process flow is as follows figure 2 shown.

[0047] The flow rate of the C4 material used in this embodiment is 5 tons / h. After the MTP by-product C4 material is subjected to conventional distillation or extractive distillation, the concentration of n-butene in it is 95%, and the water content is about 150ppm. The content of organic oxygen-containing compounds such as methyl ether is about 500ppm, and the rest is butane.

[0048] The technique provided in this embodiment comprises the following steps:

[0049] Step a: make the MTP carbon four material pass through the 8m 3 13X type molecular sieve dehydration reactor, the water content in the material is reduced from 150ppm to 50ppm, and the material A is obta...

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Abstract

The invention relates to technology for preparing ethylene and propylene by catalytically cracking a byproduct C4 material in coal to olefine. The technology comprises the following steps for treating the byproduct C4 material in coal to olefine: a, making the material pass through a dehydration reactor filled with a molecular sieve; b, making the material pass through an organic oxygen-containing compound removal reactor which is filled with an organic oxygen-containing compound adsorbent; and c, making the material pass through a catalytic reactor which is filled with a catalyst for catalytically cracking the C4 material to produce the ethylene and propylene, wherein the step a and the step b can be interchanged. The technology provided by the invention has the advantages of effectivelycracking the byproduct C4 material in coal to olefine into the ethylene and propylene and well utilizing the byproduct C4 material in coal to olefine, saving resources and having higher economical efficiency and operability.

Description

technical field [0001] The invention relates to a technology for producing olefins by catalytic cracking of hydrocarbons, in particular to a process for producing ethylene and propylene by catalytic cracking of by-product C4 materials from coal to olefins. Background technique [0002] There are four main production methods of low-carbon olefins: one is catalytic cracking of hydrocarbons to produce ethylene and propylene; the other is catalytic cracking of refineries to produce propylene; MTO and methanol to propylene, Methanol to Propylene, MTP); the fourth is the catalytic cracking of low-carbon hydrocarbons to produce ethylene and propylene. [0003] With the continuous start-up of methanol-to-olefins plants in China, MTO and MTP plants will produce a large amount of C4 olefins by-products. For example, with MTO technology, the ethylene output is 300,000 tons / year and the propylene output is 300,000 tons / year. Produce nearly 90,000 tons / year of C4 materials. Among these ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/04C07C11/06C07C4/06B01J29/44
CPCY02P20/52
Inventor 周红军周广林吴全贵
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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