Method for producing propylene, ethylene light olefin hydrocarbon

A technology of light olefins and ethylene, which is applied in the field of preparation of propylene and ethylene light olefins, can solve the problems of poor catalyst reaction stability and low propylene/ethylene ratio, and achieve improved hydrothermal stability, increased propylene selectivity, and delayed shedding speed Effect

Active Publication Date: 2009-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] The technical problem to be solved by the present invention is that in the prior art, the ratio of propylene / ethylene is low and the reaction stability of the catalyst is poor when there is methanol / dimethyl ether alkylation reaction, and a new method for preparing propylene and ethylene light olefins is provided

Method used

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  • Method for producing propylene, ethylene light olefin hydrocarbon
  • Method for producing propylene, ethylene light olefin hydrocarbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 100 grams of Φ1.6 cylindrical binder-free NaZSM-5 molecular sieve (molar silicon-aluminum ratio 200) catalyst precursor was first roasted under nitrogen flow at 600 ° C for 4 hours to release templates and other volatiles, and then with 0.1M hydrochloric acid 1000 ml was exchanged at 80°C, and repeated four times, then washed with deionized water until no chlorine radicals were present, and dried at 120°C for later use.

[0041] 50 grams of the above catalyst and La 2 o 3 100 milliliters of lanthanum nitrate solution of 0.5 grams was heated and concentrated to dryness under stirring, then dried at 120° C. for 10 hours, then added to a solution made of 1.62 grams of 85% phosphoric acid and 50 grams of water, mixed evenly, and then evaporated to dryness. Dry at 120°C for 10 hours, and bake at 550°C for 2 hours. Obtain catalyst A, containing La in weight percent 2 o 3 1.0%, P 2 o 5 2.0%.

[0042] Install 3 grams of catalyst A in a fixed-bed reactor of Φ15 mm, add ...

Embodiment 2～11

[0044] With the catalyst of Example 1, the reaction conditions were changed to obtain the evaluation result list 1.

[0045] Table 1 Reactivity of catalysts under different reaction conditions

[0046]

Embodiment 12

[0048] Carry out catalyst service life test under embodiment 5 catalyst and reaction condition, its result is as follows:

[0049] Response time (hours) Raw material conversion rate / % Propylene yield / % Ethylene yield% 50 100.00 39.17 11.06 100 100.00 40.08 11.63 200 100.00 38.48 10.97 500 99.8 37.88 9.34

[0050] Catalyst deactivation is mainly caused by carbon formation, and the catalyst can be regenerated by simple air scorching the catalyst and its reactivity can be basically restored.

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Abstract

The invention relates to a method for producing propylene and ethane light olefin by using methanol and / or dimethyl ether as raw materials so as to mainly solve the problems of poor high temperature hydrothermal stability and quick inactivation of a catalyst in the prior reaction process. The method well solves the problems through adopting the technical proposal of using reaction conditions of a molecular sieve containing rare earth and phosphorous oxides as catalysts, at a temperature of between 350 and 650 DEG C, at a pressure of between minus 0.05 and 1.0MPa, according to the weight space velocity of the methanol and / or the dimethyl ether of between 0.2 and 20 hours<-1>, and the weight ratio of water and raw materials of between 0 to 1 and 5 to 1. The method can be used in industrial production of light olefin.

Description

technical field [0001] The invention relates to a method for preparing propylene and ethylene light olefins from methanol and / or dimethyl ether. Background technique [0002] Low-carbon olefins represented by ethylene and propylene are the most basic raw materials in the chemical industry. With the development of the world economy, the demand for low-carbon olefins is also increasing year by year, while the demand for propylene is growing more rapidly. At present, propylene mainly comes from naphtha steam cracking and catalytic cracking, and the main raw material is still petroleum hydrocarbons. Due to the increasingly scarce petroleum resources, the price is becoming more and more expensive, which directly affects the supply and demand of propylene and ethylene in various countries, especially my country. price. Therefore, developing an economically feasible non-petroleum route to increase the production of light olefins such as propylene and ethylene is urgently pursued by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20C07C11/02B01J29/48
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 金文清谢在库滕加伟赵国良杨为民
Owner CHINA PETROLEUM & CHEM CORP
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