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A kind of catalyst for producing light olefin and its preparation method and application

A technology of low-carbon olefins and catalysts, which is applied in the field of catalysts for the production of low-carbon olefins and its preparation, and achieves the effects of long service life, less side reaction products, and high total yield of dienes

Active Publication Date: 2016-03-30
淄博齐创新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the application of IM-5 molecular sieve is still in the exploratory stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of modified IM-5 molecular sieve A:

[0023] SiO of IM-5 molecular sieve powder 2 / Al 2 O 3 The molar ratio is 20, and the following method is used to modify: the original IM-5 molecular sieve powder is first treated with a sodium carbonate aqueous solution with a concentration of 1.0 mol / L, the liquid-to-solid ratio of the sodium carbonate aqueous solution to the IM-5 molecular sieve raw material is 5, and the processing temperature Treated at 75℃ for 2h, and then treated with steam. The treatment conditions are temperature 460℃, pressure at normal pressure, treatment time 15h, and then treated with nitric acid solution. The concentration of nitric acid solution is 0.2mol / L, and the treatment temperature is 75℃. The liquid-solid ratio of nitric acid solution and IM-5 molecular sieve is 5:1, and the treatment time is 2h.

[0024] Preparation of modified IM-5 molecular sieve B:

[0025] SiO of IM-5 molecular sieve powder 2 / Al 2 O 3 The molar ratio is 25, and the f...

Embodiment 2

[0027] The modified IM-5 molecular sieve A, the ZSM-5 molecular sieve modified by lanthanum and gallium (SiO 2 / Al 2 O 3 The molar ratio is 150, the content of lanthanum as an element is 0.1wt%, and the content of gallium as an element is 0.2wt%), pseudo-boehmite, adding 1.0wt% of the weight of the above-mentioned molecular sieve and pseudo-boehmite dry basis Acetone, adding an appropriate amount of nitric acid solution, kneading, extruding, drying at 100°C for 5 hours, and calcining at 550°C for 4 hours to obtain catalyst A. Based on the weight of the catalyst, the content of IM-5 molecular sieve and modified ZSM-5 molecular sieve is 70% by weight, wherein the weight ratio of IM-5 molecular sieve and ZSM-5 molecular sieve is 1:6, and the balance is alumina.

[0028] The raw material used to produce low-carbon olefins is a mixture of dimethyl ether and water, and the reaction conditions used: catalyst sample 2 g , Loaded on the self-made pulse micro-reverse-chromatographic device ...

Embodiment 3

[0033] The modified IM-5 molecular sieve B, the ZSM-5 molecular sieve modified by lanthanum and gallium (SiO 2 / Al 2 O 3 The molar ratio is 180, the content of lanthanum as an element is 0.1wt%, the content of gallium is 0.2wt% as an element, pseudo-boehmite, and 1.0wt% of the weight of the above-mentioned molecular sieve and pseudo-boehmite is added. Propanol, adding an appropriate amount of nitric acid solution, kneading, extruding, drying at 100°C for 5 hours, and calcining at 550°C for 4 hours to obtain catalyst B. Based on the weight of the catalyst, the content of IM-5 molecular sieve and modified ZSM-5 molecular sieve is 75% by weight, wherein the weight ratio of IM-5 molecular sieve and ZSM-5 molecular sieve is 1:7, and the balance is alumina.

[0034] The reaction evaluation was carried out according to the reaction conditions described in Example 2, and the yield of the product after feeding 1400 g of dimethyl ether is shown in Table 2.

[0035] Table 2 Product yield of c...

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PUM

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Abstract

The invention discloses a catalyst for producing low-carbon olefin and a preparation method thereof, and application of the catalyst to a process of producing low-carbon olefin from methanol or dimethyl ether. The catalyst comprises the following raw materials by weight percent: 60%-90% of ZSM-5 molecular sieve and IM-5 molecular sieve and 10%-40% of binder, wherein the weight ratio of the IM-5 molecular sieve to the ZSM-5 molecular sieve is 1:(1.5-10). Compared with an existing catalyst with a ZSM-5 molecular sieve, the catalyst has the advantages of high propylene selectivity, high total recovery rate of ethylene and propylene, fewer side-reaction products, and good stability when being applied to the process of producing low-carbon olefin from methanol or dimethyl ether.

Description

Technical field [0001] The invention relates to a catalyst, in particular to a catalyst for producing low-carbon olefins and a preparation method and application thereof. Background technique [0002] Lower olefins generally refer to olefins with a carbon number of 4 or less, such as ethylene, propylene, and butene. Low-carbon olefins are the most basic raw materials for petrochemical production and can be used to produce organic compounds such as polyethylene, polypropylene, acrylonitrile, ethylene oxide or ethylene glycol. [0003] At present, the raw materials for producing low-carbon olefins are divided into petroleum raw materials and non-petroleum raw materials, of which the non-petroleum raw materials are mainly coal and natural gas. The main methods for producing low-carbon olefins from non-petroleum raw materials are: methanol-based low-carbon olefins, dimethyl ether-based low-carbon olefins, and synthesis gas-based low-carbon olefins. [0004] At present, there are two ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80C07C11/02C07C1/20C07C11/04C07C11/06
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 吉向飞赵娇娇
Owner 淄博齐创新材料科技有限公司