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Aqueous solution of revival agent for mtp deactivated catalyst and revival method thereof

A technology for deactivating catalyst and reactivating agent, applied in the field of coal chemical industry, can solve the problems of low methanol conversion rate and propylene selectivity, inability to prolong the catalyst operation period, and the catalyst needs to be regenerated repeatedly, so as to prolong the online operation time and increase the operation period. , the effect of improving the selectivity of propylene

Active Publication Date: 2019-01-11
SHANDONG QILU KELI CHEMICAL RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot prolong the operating cycle of the catalyst. It can only be treated after the catalyst is almost completely deactivated, or it can be regenerated outside the device after shutdown and unloading, and then reinstalled for use. The operation is complicated and the implementation process is cumbersome.
[0010] However, the catalysts regenerated by these methods still have many problems and deficiencies, mainly the MTP operating cycle is short, frequent regeneration is required, methanol conversion and propylene selectivity are not high, etc.
For example, the MTP operation cycle is short, the general operation cycle is about 600h, and the total service life is about 8000h
In addition, the catalyst needs to be regenerated repeatedly, and the energy consumption of the MTP process is high

Method used

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  • Aqueous solution of revival agent for mtp deactivated catalyst and revival method thereof
  • Aqueous solution of revival agent for mtp deactivated catalyst and revival method thereof
  • Aqueous solution of revival agent for mtp deactivated catalyst and revival method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1 (resurrection 1 time)

[0047] The deactivated MTP catalyst in the above Comparative Example 1 was not regenerated by normal charcoal burning, but was revived with an aqueous solution containing a rejuvenating agent.

[0048] Next to the comparative example experiment, the feeding of the aqueous methanol solution was stopped, and the aqueous solution of the revitalizing agent and 100% methanol were simultaneously fed instead. Gradually adjust the feed preheating temperature of the second-stage MTP reactor, and control the MTP catalyst bed temperature to 470±5°C. The resurrection agent is composed of ethylenediamine (15v%), ethanolamine (25v%), propylamine (35v%), and isobutylamine (25v%). The concentration of the resurrection agent aqueous solution is 2wt%, and the space velocity is 0.1h -1 ;Methanol space velocity 0.5h -1 , Reaction 45h. Then return to the normal feed of methanol aqueous solution (hereinafter referred to as normal feed), while adjusting t...

Embodiment 2

[0051]Example 2 (resurrection 2 times)

[0052] In Example 1, the self-made KLM-01 catalyst was regenerated by conventional regeneration method for the first air charcoal regeneration, and then continued the second cycle reaction. The temperature of the first-stage MTD reactor is 340°C, and the temperature of the second-stage MTP reactor is 480±5°C. According to the conversion rate of methanol, adjust the space velocity of methanol sequentially according to the above method until the space velocity is 1.0h -1 The methanol conversion rate dropped to 93.42%. A total of 626 hours of operation, methanol processing capacity of 1197g / g·cat, average P / E mass ratio of 7.92, propylene selectivity of 40.33%.

[0053] Stop the normal feeding of methanol aqueous solution, and change the feeding of resurrection agent aqueous solution and 100% methanol at the same time to carry out the first resurrection treatment; at the same time, gradually adjust the feed preheating temperature of the ...

Embodiment 3

[0058] Example 3 (resurrection 2 times)

[0059] In Example 2, the self-made KLM-01 catalyst was regenerated by conventional regeneration methods for the second air charcoal regeneration, and then the third cycle of reaction was continued. The temperature of the first-stage MTD reactor is 360°C, and the temperature of the second-stage MTP reactor is 480±5°C. According to the conversion rate of methanol, adjust the space velocity of methanol sequentially according to the above method until the space velocity is 1.0h -1 The methanol conversion rate dropped to 93.25%. A total of 733 hours of operation, methanol processing capacity of 996g / g·cat, average P / E mass ratio of 8.06, propylene selectivity of 40.47%.

[0060] Stop the normal feeding of methanol aqueous solution, and change the feeding of resurrection agent aqueous solution and 100% methanol at the same time, and carry out the first resurrection treatment; at the same time, gradually adjust the feed preheating temperatu...

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Abstract

The present invention discloses a reactivation agent aqueous solution of a methanol-to-propylene MTP inactivation catalyst, wherein the reactivation agent is selected from water-soluble alkyl diamine, water-soluble alkylamine, water-soluble alkyl alcohol amine and a combination thereof. In addition, the invention further discloses the corresponding reactivation agent aqueous solution, a method for reactivating a methanol-to-propylene MTP inactivation catalyst, and uses of the reactivation agent aqueous solution. According to the present invention, with the application of the reactivation agent aqueous solution to perform the online treatment, in the case of no shutdown and no agent unloading, the methanol conversion rate can be restored to more than 99%, the propylene selectivity is increased by 1-5%, and the catalyst online running time is substantially prolonged; and with the combination of the method of the present invention and the conventional air regeneration method, the energy saving and the consumption reduction can be achieved, the production efficiency can be prolonged, and the service life of the catalyst can be effectively prolonged.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, and relates to an aqueous solution of a reactivating agent for methanol-to-propylene (MTP) inactivated catalysts and a method for reactivating them, in particular to an aqueous solution of a reactivating agent for an MTP catalyst deactivated by carbon deposits and an in-situ online reactivating method . technical background: [0002] Propylene is an important petrochemical basic raw material next to ethylene, mainly derived from catalytic cracking of petroleum, steam cracking of naphtha and dehydrogenation of propane (butane). In recent years, driven by the downstream industry of propylene, the global demand for propylene has grown rapidly, and the imbalance between supply and demand of propylene has intensified year by year. In order to produce or increase the production of propylene, people have developed a variety of process routes using non-petroleum resources as raw materials. For exa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/90B01J29/40B01J38/64C07C11/06C07C1/20
CPCY02P20/52Y02P20/584
Inventor 徐兴忠李明罡张正才罗一斌高步良舒兴田
Owner SHANDONG QILU KELI CHEMICAL RESEARCH INSTITUTE CO LTD