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Use of a catalyst based on zeolites in the conversion of oxygenates to lower olefins, and associated method

A compound and catalyst technology, applied to the use of zeolite-based catalysts in converting oxygenated compounds into lower olefins and the corresponding fields, can solve the problems of shortened cycle and poor catalyst effectiveness.

Inactive Publication Date: 2009-08-05
SUD CHEM IP GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the cycle is shortened by repeated regeneration processes and thus the effectiveness of the catalyst is reduced

Method used

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  • Use of a catalyst based on zeolites in the conversion of oxygenates to lower olefins, and associated method
  • Use of a catalyst based on zeolites in the conversion of oxygenates to lower olefins, and associated method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Example 1: Modification process of zeolite with iron or iron and cerium

[0066] As pentasil type starting zeolite used was Ammon-MFI type T 4480 from Süd Chemie, Germany.

[0067] Modified with iron:

[0068] Mix 1 kg of initial zeolite with 25 g of FeCl in a ball mill at room temperature 2 *4H 2 O grind together for an hour. The mixture was heated in a chamber furnace in air from room temperature to 550° C. within 3 hours and kept there for 6 hours. After cooling the mixture obtained with 1 wt% Fe content (as Fe 2 o 3 Calculated) modified zeolite.

[0069] Modified with iron and cerium:

[0070] Mix 1 kg of initial zeolite with 25 g of FeCl in a ball mill at room temperature 2 *4H 2 O and 11.4 g CeCl 3 *7H 2 O grind together for an hour. The mixture was heated in a chamber furnace in air from room temperature to 550° C. within 3 hours and kept there for 6 hours. After cooling the mixture obtained with 1 wt% Fe content (as Fe 2 o 3 Calculation) and 0.5...

Embodiment 2

[0071] Example 2: Detection of the improved zeolite obtained from Example 1 within the scope of the invention Hydrothermal stability (compared to zeolites not modified with metals)

[0072] Depend on figure 1 It can clearly be seen that better results are achieved with the Fe-modified zeolite than with the same zeolite in its H-form, ie there is a better hydrothermal stability. Especially in the case of Fe-modified zeolites there is an adsorption band in the range of approximately 380 to 400° C. (indicated by arrows), whereas it is absent in the case of H-zeolites. However, the band at the higher temperature is a measure for the hydrothermal stability of the zeolite, since the zeolite is apparently still capable of adsorbing NH at the elevated temperature 3 .

[0073] Even better are the results in the case of using zeolites modified not only with Fe but also with Ce. Here, already at approximately 280° C., a distinct (indicated by an arrow) adsorption band can be seen....

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Abstract

The invention relates to the use of a catalyst based on crystalline aluminosilicates for the conversion of oxygenates to lower olefins, the catalyst having an SiO2 / Al2O3 molar ratio of 20 to 200 and being modified with 0.1% to 10% by weight of readily oxidant metal (calculated as the corresponding metal oxide) and / or with 0.05% to 5% by weight of cerium (calculated as Ce2O3), and also to an associated method.

Description

technical field [0001] The present invention relates to the use of catalysts based on crystalline aluminosilicates with Metal and / or cerium modification with slight oxidation, and corresponding methods. Background technique [0002] A typical transformation reaction for use in the present invention and the process of the present invention is described by the following equation: [0003] [0004] For the first step (equilibrium reaction), customary dehydration catalysts, such as gamma-alumina, or also the catalysts described within the scope of the present invention, are used as so-called upstream catalysts. In principle, the conversion of a reaction mixture containing methanol vapor and / or dimethyl ether vapor and water vapor can take place in a tubular reactor over an indirectly cooled catalyst, as described for example in EP 0 448 000 A1, should the This document is included in the disclosure content of the present invention by reference thereto. In particular, withi...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C11/02
CPCC07C1/20Y02P30/20Y02P30/40C07C11/02
Inventor A·迪斯勒R·A·拉科兹R·阿尔特霍夫
Owner SUD CHEM IP GMBH & CO KG
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