Catalyst for preparation of propylene and ethylene from mixed C4 alkenes and application thereof

A catalyst, ethylene technology, applied in molecular sieve catalysts, physical/chemical process catalysts, hydrocarbon cracking to produce hydrocarbons, etc., can solve the problem of not giving a low degree of hydrogen transfer reaction, and cannot have high propylene yield and low degree of hydrogen transfer reaction at the same time. And other issues

Active Publication Date: 2010-03-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the existing literature shows that the existing catalysts either cannot have high propylene yield and low hydrogen transfer reaction degree at the same time, or only give data on high propylene yield but not low hydrogen transfer reaction degree

Method used

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  • Catalyst for preparation of propylene and ethylene from mixed C4 alkenes and application thereof
  • Catalyst for preparation of propylene and ethylene from mixed C4 alkenes and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Catalyst preparation: HZSM-5 molecular sieve (purchased from the market, silicon-aluminum molar ratio of 200) and alumina (weight ratio of 3:1) are mixed uniformly, stirred and kneaded, and extruded. Drying at 100°C for 10 hours, and baking at 560°C for 4 hours. The strips were placed in an aqueous solution containing potassium nitrate, diammonium hydrogen phosphate and lanthanum nitrate for 2 hours, filtered, dried at 100°C for 10 hours, and calcined at 560°C for 4 hours. Based on the weight percentage of the catalyst, the catalyst contains 74.0% ZSM-5 molecular sieve, 23.8% alumina, 0.2% potassium oxide, 1.0% phosphorus oxide and 1.0% lanthanum oxide.

[0031] The catalyst evaluation conditions are: reaction temperature 520℃, pressure 0.1MPa, weight ratio of water in the feed to feed C4 is 0.5, and feed weight space velocity is 2.5h -1 . The results of the reaction are shown in Table 2.

Embodiment 2

[0033] Catalyst preparation: HZSM-5 molecular sieve (purchased from the market, silicon-aluminum molar ratio of 200) and alumina (weight ratio of 3:1) are mixed uniformly, stirred and kneaded, and extruded. Dry at 100°C for 10 hours, and calcinate at 560°C for 4 hours. The strips were placed in an aqueous solution containing potassium nitrate, diammonium hydrogen phosphate and cerium nitrate for 2 hours, filtered, dried at 100°C for 10 hours, and calcined at 560°C for 4 hours. The catalyst contains 74.0% ZSM-5 molecular sieve, 23.8% alumina, 0.2% potassium oxide, 1.0% phosphorus oxide and 1.0% cerium oxide based on the weight percentage content of the catalyst. The catalyst evaluation conditions were the same as in Example 1. The results of the reaction are shown in Table 2.

Embodiment 3

[0035] Catalyst preparation: HZSM-5 molecular sieve (purchased from the market, silicon-aluminum molar ratio of 200) and alumina (weight ratio of 3:1) are mixed uniformly, stirred and kneaded, and extruded. Dry at 100°C for 10 hours, and calcinate at 560°C for 4 hours. The strips were placed in an aqueous solution containing potassium nitrate and diammonium hydrogen phosphate for 2 hours, filtered, dried at 100°C for 10 hours, and calcined at 560°C for 4 hours. Based on the weight percentage of the catalyst, the catalyst contains 74.1% ZSM-5 molecular sieve, 24.75% alumina, 0.15% potassium oxide and 1.0% phosphorus oxide. The catalyst evaluation conditions were the same as in Example 1. The results of the reaction are shown in Table 2.

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Abstract

The invention discloses a catalyst for preparation of propylene and ethylene by transforming mixed C4 alkenes and application thereof. The modified components including lanthanide metal oxides, alkalimetal oxides and phosphorus oxides are introduced into the catalyst so that the catalyst has high propylene yield and low hydrogen transfer degree. The catalyst catalyzes the reactions of preparing the propylene and the ethylene by transforming the mixed C4 alkenes under the following reaction conditions that: the reaction temperature is between 460 and 600 DEG C, the pressure is between -0.05 and 0.3 MPa, the weight ratio of feed water to feed C4 is 0 to 1, and the weight space velocity is 1-20 h<-1>. By using the catalyst in the process of catalyzing the reaction of preparing the propyleneand the ethylene by transforming the mixed C4 alkenes, compared with an unmodified molecular sieve, the catalyst can obviously improve the yield of the propylene and the ethylene. Simultaneously, theyield of byproducts C1-C3 alkanes is obviously reduced.

Description

Technical field [0001] The present invention relates to a catalyst for preparing olefins and its application, more specifically, the present invention relates to 4 Catalysts and applications for olefins to produce propylene and ethylene. Background technique [0002] There is a considerable amount of mixed C in the petroleum refining process 4 generate. In recent years, with the growth of my country's demand for propylene, the process or technology that uses propylene as the target product has received attention. By C 4 The study of olefin conversion to propylene is one of the research contents. [0003] In catalytic mixing C 4 In the process of converting olefins to propylene, catalysts containing molecular sieves are generally used, and molecular sieves are mostly selected from ZSM type. Due to the nature of the molecular sieve and the reaction characteristics, it is difficult to avoid carbon deposition on the catalyst during the reaction process. At the same time, due to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C4/06C07C11/02
CPCY02P20/52
Inventor 吉媛媛郝雪松刘小波王超陈硕
Owner CHINA PETROLEUM & CHEM CORP
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