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Regeneration method of molecular sieve catalyst

A molecular sieve and catalyst technology, applied in the field of molecular sieve catalyst regeneration, can solve the problems of molecular sieve catalyst dealumination, permanent deactivation, overheating, etc.

Active Publication Date: 2012-12-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defect that when the existing technology is used to regenerate the molecular sieve catalyst, it is easy to cause overheating and cause its partial permanent deactivation; or when regeneration is carried out under the condition of water, it is easy to cause serious dealumination of the molecular sieve catalyst. To provide a method for regenerating a molecular sieve catalyst capable of effectively regenerating a molecular sieve catalyst without deactivating the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This example is used to illustrate the regeneration method of the molecular sieve catalyst provided by the present invention.

[0032] (1) The reaction process of preparing propylene from C4 hydrocarbons:

[0033] 20g of molecular sieve catalyst 1 was loaded into a fixed bed reaction tube, wherein the inner diameter of the fixed bed reaction tube was 18 mm, and the aspect ratio was 5. Control the reaction temperature to be 520°C and the reaction pressure to be 0.1MPa, and the mixture of water and C4 hydrocarbons with a weight ratio of 0.5 to be heated for 2.5h -1 The weight space velocity is passed into the reaction tube. A section of heating jacket for controlling the heating temperature is arranged outside the fixed bed reaction tube. The calculated propylene yield at the beginning of the reaction was 30.97%, and after 500 hours of operation, the calculated propylene yield was 28.14% before the catalyst was regenerated.

[0034] (2) Regeneration of molecular sieve ...

Embodiment 2

[0046] This example is used to illustrate the regeneration method of the molecular sieve catalyst provided by the present invention.

[0047] (1) The reaction process of preparing propylene from C4 hydrocarbons:

[0048] The catalytic reaction was carried out according to the method described in Example 1, except that the catalyst was molecular sieve catalyst 2. The calculated propylene yield at the beginning of the reaction was 30.66%, and after 1000 hours of operation, the calculated propylene yield was 27.56% before the catalyst was regenerated.

[0049] (2) Regeneration of molecular sieve catalyst:

[0050] Stop feeding the mixture of water and C4 hydrocarbons into the reactor, and lower the temperature in the fixed-bed reaction tube to 300°C. Feed nitrogen and air in described fixed-bed reaction tube, the flow of controlling nitrogen is 100 milliliters / minute, the flow of air is 70 milliliters / minute, promptly the oxygen content in the mixed gas of nitrogen and air is 8...

Embodiment 3

[0053]This example is used to illustrate the regeneration method of the molecular sieve catalyst provided by the present invention.

[0054] (1) The reaction process of preparing propylene from C4 hydrocarbons:

[0055] The catalytic reaction was carried out according to the method described in Example 2. The difference was that the operating reaction time was 500 h, the calculated propylene yield at the initial stage of the reaction was 31.04%, and the calculated propylene yield before the catalyst was regenerated was 28.75%.

[0056] (2) Regeneration of molecular sieve catalyst:

[0057] 1) Stop feeding the mixture of water and C4 hydrocarbons into the reactor, and lower the temperature in the fixed-bed reaction tube to 300°C. Feed nitrogen and air in described fixed-bed reaction tube, the flow of controlling nitrogen is 100 milliliters / minute, the flow of air is 70 milliliters / minute, promptly the oxygen content in the mixed gas of nitrogen and air is 8.6 volume %, at 300 ...

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Abstract

The invention provides a regeneration method of a molecular sieve catalyst, comprising the following steps: roasting a molecular sieve catalyst to be regenerated at 300-750 DEG C to decomposing the carbon deposit in the molecular sieve catalyst to be regenerated into CO2, wherein the roasting step is characterized in that: in the presence of oxygen-containing gas, the molecular sieve catalyst to be regenerated is subject to roasting of multiple stages at a constant temperature, the roasting of multiple stages comprises a first roasting stage and roasting stages after the first roasting stage, the roasting temperature of any one roasting stage after the first roasting stage is 5-70 DEG C higher than that of the adjacent former roasting stage, and the roasting time of each roasting stage is long enough to generate no CO2 when roasting is conducted under the roasting condition of the roasting stage. According to the invention, the performance of the regenerated molecular sieve catalyst is recovered and even better than the performance of a fresh catalyst, thus good regeneration effect can be achieved by using the method disclosed herein.

Description

technical field [0001] The invention relates to a regeneration method of a molecular sieve catalyst. Background technique [0002] In recent years, with the growth of my country's demand for propylene, the technologies or processes (such as FCC process and C 4 The production process of producing propylene from olefins as raw materials) is getting more and more attention. In these reaction processes, molecular sieve catalysts are generally used. Since the reaction process for producing propylene is generally carried out at a relatively high temperature, and because the molecular sieve is acidic, the catalyst is prone to decrease in catalytic activity due to the formation of carbon deposits and the continuous accumulation of carbon deposits during the reaction. [0003] Although the regeneration process of molecular sieve catalysts deactivated by the formation of carbon deposits is based on the principle of oxidative carbon deposits, that is, by burning carbon deposits (comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/90
Inventor 吉媛媛
Owner CHINA PETROLEUM & CHEM CORP
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