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Method for preparing ethene and propylene

An ethylene and propylene technology, applied in the field of preparation of low-carbon olefins, can solve the problems of difficulty in separation, uneconomical and the like, and achieve the effects of long service life, simple preparation method and simple process

Inactive Publication Date: 2004-04-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If mixed C4 or C5 olefins are used as raw materials, besides ethylene and propylene, there are many by-products in the product, which are difficult to separate
with C 4 and C 5 The disproportionation reaction of olefinic hydrocarbon raw materials to produce ethylene and propylene has the following disadvantages: (1) the raw materials must be pretreated before the reaction; (2) ethylene must be used during the reaction to reduce the generation of by-products and reduce product separation (3) Downgrading high-value ethylene into lower-value propylene is uneconomical

Method used

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  • Method for preparing ethene and propylene
  • Method for preparing ethene and propylene

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Example 1 Preparation of catalyst A

[0037] 150g ZRP molecular sieve (provided by Beijing Wanshuyuan Economic and Technological Trade Center, SiO 2 / Al 2 O 3 >200), 75g alumina (provided by Beijing Green Star Special Catalytic Technology Co., Ltd.), and 8g succulent powder; add 120ml of 5% nitric acid after mixing, extrude into 2mm cylindrical shape after mixing, and cut into 2- 3mm; dried at 80°C and 120°C for 10 hours respectively, then calcined at 580°C for 6 hours, taken out and cooled to room temperature; then take 50g of the shaped catalyst with 30ml of 0.3M ammonium molybdate, 0.1M lanthanum nitrate and 0.6M phosphoric acid respectively Immersion in ammonium solution, drying at 80°C and 120°C for 10 hours, calcining at 580°C for 6 hours, and then put into a desiccator for use.

[0038] The catalyst prepared in this way, designated catalyst A, has the following composition: Al 2 O 3 29.2%, ZRP zeolite 58.4%, MoO 3 8.1%, P 2 O 5 3.2%, La 2 O 3 is 1.1%.

Embodiment 2

[0039] Example 2 Preparation of catalyst B

[0040] Example 1 was repeated, changing the amount of alumina to 150 g and the amount of nitric acid to 150 ml. Other operation methods are the same as in Example 1.

[0041] The catalyst prepared in this way, designated catalyst B, has the following composition: Al 2 O 3 43.8%, ZRP zeolite 43.8%, MoO 3 8.1%, P 2 O 5 3.2%, La 2 O 3 is 1.1%.

Embodiment 3

[0042] Example 3 Preparation of catalyst C

[0043] Example 1 was repeated, and 150g of ZRP molecular sieve, 75g of alumina, 10g of calcium carbonate, and 8g of succulent powder were mixed;

[0044] The catalyst prepared in this way, designated Catalyst C, has the following composition: Al 2 O 3 28.5%, ZRP zeolite 57.0%, MoO 3 8.0%, P 2 O 5 3.2%, La 2 O 3 It is 1.2%, and CaO is 2.1%.

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Abstract

A process for preparing ethylene and propylene from the hydrocarbon mixture containing C4 (or C5) olefine includes such steps as contacting the zeolite contained catalyst in fixed-bed reactor, reacting at 350-500 deg.C and 1-10 / hr of space speed under 0.6-1.0 MPa to obtain the mixture of ethylene and propylene, and cooling separating. Said catalyst contains Al2O3 or SiO2, high-Si zeolite and modifier.

Description

technical field [0001] The present invention relates to the preparation method of low-carbon olefins, in particular, the present invention relates to the preparation method of ethylene and propylene from the hydrocarbon feedstock containing carbon four or carbon five monoolefins in the presence of zeolite catalyst. Background technique [0002] As we all know, ethylene and propylene are important basic raw materials of organic chemistry and petrochemical industry, and are the basis for the production of various important organic chemical products. They are mainly produced by dehydrogenation of ethane and propane, catalytic cracking or catalytic cracking of petroleum hydrocarbons. [0003] With the continuous development of the ethylene industry and oil refining industry, the output of by-product C4 and C5 fractions is increasing. In order to make full use of resources and reduce the cost of ethylene production, the comprehensive utilization of this huge resource has become a...

Claims

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Application Information

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IPC IPC(8): C07C4/06C07C11/04C07C11/06
Inventor 王定博马志元李普阳
Owner CHINA PETROLEUM & CHEM CORP
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