In-vessel regeneration method of zsm-5 zeolite catalyst for ethanol dehydration

A ZSM-5, zeolite catalyst technology, applied in catalyst regeneration/reactivation, chemical instruments and methods, molecular sieve catalysts, etc., can solve the problem of reaction conversion rate and yield affecting catalyst life, long plant downtime, and poor regeneration effect. and other problems, to achieve the effect of preventing flying temperature, short regeneration time and easy operation

Inactive Publication Date: 2011-12-28
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the regeneration method in the prior art has poor regeneration effect, thereby affecting the prolongation of the catalyst life, the reaction conversion rate and the yield, and the problem that the catalyst replacement causes the device to stop for a long time and affects the output of the device. Provide a new in-vessel regeneration method for ethanol dehydration ZSM-5 zeolite catalyst

Method used

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  • In-vessel regeneration method of zsm-5 zeolite catalyst for ethanol dehydration
  • In-vessel regeneration method of zsm-5 zeolite catalyst for ethanol dehydration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A ZSM-5 zeolite catalyst for ethanol dehydration to ethylene, the reaction temperature reached 280°C, but the ethanol conversion rate was only 91%. Excluding other reasons, it was judged that the ZSM-5 zeolite ethanol dehydration catalyst was deactivated by coking, and then the catalyst was regenerated in the device.

Embodiment 2

[0029] The catalyst of [Example 1] was regenerated in the vessel.

[0030] a) Nitrogen is fed into the reactor until the tail gas does not contain reactants; the system pressure is 0.3 MPa, and the volume ratio of nitrogen to catalyst is 30.

[0031] b) Switch nitrogen to oxygen-containing nitrogen, and simultaneously control the reactor temperature to 210° C., and keep the temperature constant for 10 hours; control the initial oxygen volume content in oxygen-containing nitrogen to less than 0.01%, and increase it to 0.25% within 5 hours.

[0032]c) Gradually raise the temperature of the reactor to 300° C., keep the temperature constant for 8 hours, and increase the volume content of oxygen in the oxygen-containing nitrogen to 0.6% within 3 hours.

[0033] d) Gradually raise the temperature of the reactor to 410°C, keep the temperature constant for 10 hours, and reduce the volume content of oxygen in the oxygen-containing nitrogen to 0.1% within 3 hours.

[0034] e) Gradually...

Embodiment 3～5

[0039] The catalyst of [Example 1] was regenerated in the vessel. Steps a) and f) are the same as [Example 1], the conditions of steps b), c), d), and e) are shown in Table 1, the reaction conditions after regeneration are the same as [Example 1], and the reaction results are shown in Table 2.

[0040] Table 1

[0041]

[0042] Table 2

[0043]

[0044] Example 1 Reaction temperature 280°C

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Abstract

The invention relates to an in-device regeneration method for ethanol dehydration ZSM-5 zeolite catalyst, which mainly solves the problem of poor regeneration effect of the regeneration method in the prior art, thus affecting the life of the catalyst, reaction conversion rate and yield, and device shutdown caused by catalyst replacement It takes a long time to affect the output of the device. The present invention adopts the method for regeneration by burning carbon with oxygen-containing nitrogen in the device, including purging the whole system with nitrogen to remove the reaction mixture, stepwise combustion regeneration with oxygen-containing nitrogen, cooling the system and replacing the oxygen-containing gas with nitrogen. The problem is solved, and the method can be used in the industrial production of ethylene prepared by catalyzing ethanol dehydration with ZSM-5 zeolite catalyst.

Description

technical field [0001] The invention relates to an internal regeneration method of a ZSM-5 zeolite catalyst for ethanol dehydration. Background technique [0002] As a basic organic chemical raw material and a leading product in the petrochemical industry, ethylene is known as the "mother of petrochemical industry". It is mainly used in the production of polyethylene, ethylene oxide / ethylene glycol, dichloroethane, styrene, acetic acid Chemicals such as ethylene. With the rapid development of ethylene derivative industries such as chemical industry, energy and materials, the demand for ethylene is increasing. At present, ethylene mainly comes from naphtha cracking. As petroleum resources are non-renewable and are gradually becoming exhausted, the use of renewable biomass resources to develop bioenergy and biochemical industries has become an inevitable trend of current and future economic development. Ethanol can be obtained by fermentation of plant starch or wood fiber. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/90B01J29/40B01J38/14B01J38/20C07C11/04C07C1/24
CPCY02P20/52Y02P20/584
Inventor 李亚男金照生徐菁金萍黄祖娟
Owner CHINA PETROLEUM & CHEM CORP
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