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Catalyst for synthesis of isoprene and preparation method thereof

A technology of isoprene and catalyst, applied in the field of catalyst for synthesizing isoprene and its preparation, can solve the problem of isobutene selectivity not being given, and achieve the effect of high conversion rate and selectivity

Active Publication Date: 2017-03-29
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

Another example is that the Chinese patent with publication number CN85102885 has reported that adopting a ZSM-5 molecular sieve with a silicon-aluminum ratio of 10 to 40, and introducing a small amount of metal elements into a solid acid catalyst, the selectivity in terms of formaldehyde can be higher than 80%, but for Isobutene selectivity not given

Method used

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preparation example Construction

[0032] The present invention also provides a method for preparing the catalyst described in the above technical solution, comprising the following steps:

[0033] a) mixing a chromium source, a molybdenum source, a phosphorus source, a rare earth element compound, an alkali metal / alkaline earth metal compound and a carrier in a solvent to obtain a catalyst intermediate;

[0034] b) The catalyst intermediate is left standing, dried, aged and calcined in sequence to obtain a catalyst for synthesizing isoprene.

[0035] In the invention, firstly, chromium source, molybdenum source, phosphorus source, rare earth element compound, alkali metal / alkaline earth metal compound and carrier are mixed in a solvent to obtain a catalyst intermediate. In the present invention, the chromium source is preferably selected from CrO 3 、Cr 2 o 3 and Cr(NO 3 ) 3 One or more of, more preferably CrO 3. In the present invention, the molybdenum source is preferably selected from MoO 3 And / or am...

Embodiment 1

[0054] (1) 3.0g CrO 3 , 15mL H 3 PO 4 , 1.75g ​​(NH 4 ) 2 Ce(NO 3 ) 6 , 0.41g ammonium molybdate and 0.01g KNO 3 Dissolve in 50mL deionized water to obtain a mixed solution; add the mixed solution dropwise to 20g SiO 2 Mix well and evenly in the microspheres to obtain a catalyst intermediate.

[0055] (2) Put the catalyst intermediate at 25°C for 12h, then dry at 110°C to remove water, continue to age at the above temperature for 12h, and finally heat up to 580°C at 15°C / min and roast for 6h to obtain Catalyst for the synthesis of isoprene.

[0056] On the fixed-bed reaction system, the catalyst provided in Example 1 was subjected to the gas-phase one-step synthesis of isoprene from isobutene / formaldehyde. The reaction conditions were: the enaldehyde ratio was 3.5:1, the reaction temperature was 250°C, and the contact time was 0.6 s. Experimental results show that the catalyst provided by Example 1 has a selectivity of isobutene of 90.57%, a conversion rate of formal...

Embodiment 2

[0058] (1) 2.0g CrO 3 , 0.4mL H 3 PO 4 , 0.25g (NH 4 ) 2 Ce(NO 3 ) 6 , 0.205g ammonium molybdate and 0.005g KNO 3 Dissolve in 50mL deionized water to obtain a mixed solution; add the mixed solution dropwise to 20g SiO 2 Mix well and evenly in the microspheres to obtain a catalyst intermediate.

[0059] (2) Put the catalyst intermediate at 25°C for 12h, then dry at 110°C to remove water, continue to age at the above temperature for 12h, and finally heat up to 580°C at 20°C / min and roast for 6h to obtain Catalyst for the synthesis of isoprene.

[0060] The catalyst provided in Example 2 was used to synthesize isoprene in the gas phase of isobutylene / formaldehyde in a fixed-bed reaction system. The reaction conditions were: the enaldehyde ratio was 2.0:1, the reaction temperature was 300°C, and the contact time was 0.3 s. Experimental results show that the catalyst provided by Example 2 has a selectivity of isobutene of 83.47%, a conversion rate of formaldehyde of 86.5%...

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Abstract

The invention provides a catalyst for synthesis of isoprene. The catalyst comprises active components and a carrier. The active components comprise a Cr element, a Mo element, a P element, a rare earth element and an alkali metal / alkaline earth metal element. The rare earth element comprises one or more of La, Ce, Nd, Sm, Gd and Lu. Compared with the existing catalyst, the catalyst provided by the invention is based on the Cr-Mo-P bimetallic active center, contains the rare earth element and the alkali metal / alkaline earth metal element for forming a five-membered active component having synergistic effects so that the catalyst has a higher conversion rate and selectivity in the gas phase one-step synthesis of isoprene. The experimental result shows that the selectivity of isobutylene is 80% or more in the process of synthesis of isoprene by a gas phase one-step method, the conversion rate of formaldehyde is 80% or more and the selectivity of formaldehyde is 79% or more.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a catalyst for synthesizing isoprene and a preparation method thereof. Background technique [0002] Isoprene is an important monomer of synthetic rubber, and is also widely used in fine chemical products, such as medicine, pesticides and spices. At present, in order to further improve the utilization rate of excess C4 resources, the preparation of isoprene from isobutylene (MTBE) and formaldehyde has broad market prospects and considerable social and economic benefits. [0003] So far, the processes for preparing isoprene from isobutylene and formaldehyde include liquid-phase two-step method, liquid-phase one-step method and gas-phase one-step method. Among them, the gas-phase one-step method has the advantages of simple process and small equipment investment, and has become a widely used method. craft technology. High-efficiency catalysts are the key to the one-step...

Claims

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Application Information

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IPC IPC(8): B01J27/19C07C2/86C07C11/18
CPCB01J27/19C07C2/867C07C2523/02C07C2523/04C07C2523/10C07C2523/26C07C2523/28C07C2527/19C07C11/18
Inventor 张春雨白晨曦张学全
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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