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A kind of reuse method of deactivated catalyst and composite catalyst

A technology for deactivating catalysts and catalysts, applied in catalysts, molecular sieve catalysts, carbon compound catalysts, etc., can solve the problems of inability to completely remove carbon deposits, irreversible deactivation of catalysts, etc., to reduce energy consumption, good catalytic performance, and service life. prolonged effect

Active Publication Date: 2021-04-23
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the carbon deposition cannot be completely removed when the calcination temperature is low, and the irreversible deactivation of the catalyst is easily caused by the sintering of the active components of the catalyst when the calcination temperature is high.

Method used

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  • A kind of reuse method of deactivated catalyst and composite catalyst
  • A kind of reuse method of deactivated catalyst and composite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Weigh 2.5g ammonium molybdate and 0.51g phosphoric acid to make 12ml solution, add 10g SiO 2 , aged at 25°C for 12h, dried at 90°C for 10h, and calcined at 500°C for 4h to obtain MoP / SiO 2 Catalyst (active component loading 20wt%);

[0048] (2) Take 2.0g MoP / SiO 2 It is used for the synthesis of isoprene by the gas phase method of alkenal. The reaction conditions are: a fixed bed under normal pressure, at 250 ° C, with nitrogen (10ml / min) as the internal standard, and the molar ratio of isobutene and formaldehyde is kept at 4:1. Catalyst The contact time is 1.3s, the reaction induction period is 1h, and after the reaction is carried out for 5h, when the yield of isoprene drops to 16%, the catalyst is recovered, and its carbon content is about 25wt%;

[0049] (3) Take 0.8g recovered MoP / SiO 2 Catalyst and 1.2 g fresh MoP / SiO 2 The catalyst is added to the agitator, and the binary composite catalyst is obtained after being uniformly mixed by mechanical stirring;

...

Embodiment 2

[0054] (1) Weigh 5.0g TiCl 4 Add it into 50ml of water, quickly add 3.6g of phosphoric acid under stirring, add ammonia water to adjust the pH to 4, age at 20°C for 24h, filter, dry at 90°C for 15h, and roast at 450°C for 8h to obtain a TiP catalyst;

[0055] (2) Take 2.0g TiP for the synthesis of isoprene by alkenal gas phase method, the reaction conditions are: fixed bed under normal pressure, at 280°C, with nitrogen (10ml / min) as internal standard, to keep isobutylene and formaldehyde molar The ratio is 9:1, the catalyst contact time is 0.4s, and the reaction induction period is 1h. After the reaction is carried out for 5h, when the yield of isoprene drops to 12%, the catalyst is recovered, and its carbon content is about 14wt%;

[0056] (3) Get the TiP catalyst that 0.8g reclaims and the fresh TiP catalyst of 1.2g and join in the stirrer, obtain binary composite catalyst after mixing by mechanical stirring;

[0057] (4) ZrO 2 0.1g adds (3) gained binary composite catalys...

Embodiment 3

[0061] (1) Weigh 2.5g CrO 3 Dissolve in 10ml of water, add 1.8g of phosphoric acid, stir well and add 10g of SiO 2 , aged at 30°C for 18h, dried at 110°C for 8h, and calcined at 500°C for 5h to obtain CrP / SiO 2 Catalyst (active component loading 28wt%);

[0062] (2) 2.0g CrP / SiO 2 It is used for the synthesis of isoprene by the gas phase method of alkenal. The reaction conditions are: a fixed bed under normal pressure, at 370 ° C, with nitrogen (10ml / min) as the internal standard, and the molar ratio of isobutene and formaldehyde is kept at 5:1. Catalyst The contact time is 1.4s, the reaction induction period is 0.5h, and after the reaction is carried out for 1h, when the yield of isoprene is 34%, the catalyst is recovered, and its carbon content is about 11wt%;

[0063] (3) Take 1.0g of recovered CrP / SiO 2 Catalyst and 1.0 g fresh CrP / SiO 2 The catalyst is added to the agitator, and the binary composite catalyst is obtained after being uniformly mixed by mechanical stirr...

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Abstract

The invention belongs to the field of catalysts, and in particular relates to a method for reusing a deactivated catalyst and a composite catalyst. The method provided by the invention comprises the following steps: a) providing a deactivated catalyst with carbon deposits on the surface of the deactivated catalyst; The active catalyst, the fresh solid acid catalyst and the active additive are mixed to obtain a multi-component composite catalyst; c) reacting isobutene and formaldehyde in the presence of the multi-component composite catalyst to obtain isoprene. The method provided by the invention uses deactivated catalysts, fresh catalysts and active additives to synthesize isoprene without high-temperature roasting of deactivated catalysts. The reaction induction period prolongs the service life of the catalyst.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a method for reusing a deactivated catalyst and a composite catalyst. Background technique [0002] Isoprene is an essential raw material for the synthesis of natural rubber, especially for the application of synthetic special rubber products, which is irreplaceable by other chemical raw materials. At present, the main methods for preparing isoprene are divided into physical separation method and chemical synthesis method. The physical separation method is to extract its carbon five fractions by cracking naphtha to produce ethylene. This method is limited by market fluctuations, and facing the continuous development of the rubber industry, the demand for high-performance synthetic natural rubber is increasing rapidly. This is a traditional method. Physical analysis poses a huge challenge, so the development of chemical synthesis to synthesize isoprene provides a new idea to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/19C07C2/86C07C11/18B01J27/14B01J27/188B01J27/198B01J29/40B01J31/18
CPCB01J27/14B01J27/188B01J27/19B01J27/198B01J29/405B01J2229/18C07C2/867C07C2527/14C07C2527/188C07C2527/19C07C2527/198C07C2529/40C07C2531/18C07C11/18Y02P20/584
Inventor 白晨曦祁彦龙代全权崔龙
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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