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Regeneration method of catalyst for preparing isobutene through deactivated n-butene skeletal isomerization

A technology for n-butene and isomerization, which is applied in the field of regeneration of catalysts for preparing isobutene by skeletal isomerization of deactivated n-butene, can solve the problems of cumbersome operation, long regeneration period, destruction of catalyst structure and the like, and achieves a simple regeneration process. , The effect of low regeneration temperature and short regeneration time

Pending Publication Date: 2021-02-23
茂名实华东油化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this technology is that the carbon removal is relatively complete, but the disadvantages are: cumbersome operation, long regeneration cycle of more than 48 hours, which is not conducive to industrial production, and generally requires a high temperature of about 650 ° C, which may damage the structure of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The sodium ZSM-35 molecular sieve (SiO 2 、Al 2 o 3 The molar ratio is 15:1) and sodium aluminate, silica sol with a mass fraction of 40%, scallion powder and deionized water (mass ratio is 40:4:51:2:3) are fully kneaded to form a viscous paste , and then extruded from a molded plate with 2.5mm holes, the catalyst was naturally dried for 24 hours, then dried at 110°C for 12 hours, and finally calcined at 550°C for 12 hours in an air atmosphere, and the final catalyst was obtained after ammonium exchange and dry roasting, denoted as ISO -1. The catalyst is crushed and sieved before use, and the particles of 20-40 mesh are selected.

[0025] Catalyst performance was evaluated by n-butene skeletal isomerization reaction: the catalyst was filled in a 20 mL fixed-bed reactor, and then high-purity nitrogen gas was introduced at a rate of 50 mL / min, the temperature was raised to 400 ° C, the catalyst was pretreated for 3 h, and then the temperature was lowered to temperature...

Embodiment 2

[0027] The regeneration method of the catalyst for preparing isobutene by deactivated n-butene skeletal isomerization comprises the following steps:

[0028] (1) Pack the deactivated catalyst Cat-D obtained in Example 1 into a 20mL fixed-bed reactor, and in 20h -1 Benzene is passed into the fixed-bed reactor at the weight hourly space velocity;

[0029] (2) Pressure-holding and regeneration at 100°C and 0.5MPa for 10h;

[0030] (3) Reduce the pressure in the fixed-bed reactor to normal pressure, pass nitrogen gas into the fixed-bed reactor at a flow rate of 50mL / min and purge at 120°C for 3h. After purging, take out the regenerated catalyst and record it as ISO-2. See Table 1 for the analysis of the amount of carbon deposited on the regenerated catalyst.

Embodiment 3

[0032] The regeneration method of the catalyst for preparing isobutene by deactivated n-butene skeletal isomerization comprises the following steps:

[0033] (1) Pack the deactivated catalyst Cat-D obtained in Example 1 into a 20mL fixed-bed reactor, and in 20h -1 The weight hourly space velocity passes toluene into the fixed-bed reactor;

[0034] (2) Pressure-holding and regeneration at 130°C and 0.5MPa for 10h;

[0035] (3) Reduce the pressure in the fixed-bed reactor to normal pressure, pass nitrogen gas into the fixed-bed reactor at a flow rate of 50mL / min and purge at 150°C for 3h. After purging, take out the regenerated catalyst and record it as ISO-3. See Table 1 for the analysis of the amount of carbon deposited on the regenerated catalyst.

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Abstract

The invention provides a regeneration method of a catalyst for preparing isobutene by deactivated n-butene skeletal isomerization, which comprises the following steps: (1) putting the catalyst for preparing isobutene by deactivated n-butene skeletal isomerization into a fixed bed reactor, and introducing an organic solvent into the fixed bed reactor; (2) carrying out pressure maintaining regeneration for 5-20 hours at the temperature of 80-200 DEG C; and (3) reducing the pressure in the fixed bed reactor to normal pressure, introducing inert gas into the fixed bed reactor, and conducting purging for 3-6 hours. The method has the advantages that the regeneration process is simple, the regeneration temperature is low, the regeneration time is short, and the performance of the regenerated catalyst can be close to or reach the level of a fresh catalyst.

Description

technical field [0001] The invention relates to a regeneration method for a catalyst used for preparing isobutene by deactivated n-butene skeleton isomerization. Background technique [0002] With the increasingly stringent environmental protection requirements, my country has accelerated the pace of gasoline quality upgrading. From January 1, 2017, the country has fully supplied National V standard gasoline. The main content of my country's gasoline standard upgrade is to meet the requirements of gasoline "desulfurization, manganese reduction, and olefin reduction" while ensuring the octane number. The reduction of olefins and aromatics will make it difficult to meet the octane number of gasoline, so it is very important to develop clean components with high octane number to blend gasoline. Methyl tert-butyl ether (MTBE) is an ideal octane number enhancement agent, which can meet the requirements of oil upgrade. In 2018, my country's gasoline production reached 138.877 mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/56B01J38/04B01J29/90B01J29/65C07C5/27C07C11/09
CPCB01J38/04B01J38/56B01J29/90B01J29/65C07C5/2775C07C11/09Y02P20/584
Inventor 刘志军
Owner 茂名实华东油化工有限公司
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