Regeneration method of titanium-silicon molecular sieve catalyst

A titanium-silicon molecular sieve and catalyst technology, which is applied in the field of titanium-silicon molecular sieve catalyst regeneration, can solve the problems of low catalyst activity recovery rate and long operation time, and achieve the effects of improving the activity recovery rate, reducing material consumption and improving regeneration efficiency.

Inactive Publication Date: 2013-02-27
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention proposes a catalyst regeneration method for titanium-silicon molecular sieves, which overcomes the disadvantages of long operation time and low recovery rate of catalyst activity in existing solvent regeneration catalyst methods

Method used

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  • Regeneration method of titanium-silicon molecular sieve catalyst
  • Regeneration method of titanium-silicon molecular sieve catalyst
  • Regeneration method of titanium-silicon molecular sieve catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The formed titanium-silicon molecular sieve catalyst is loaded into a fixed-bed reactor. The raw materials for the reaction are cumene hydroperoxide and liquid polymer grade propylene. The weight space velocity of cumene hydroperoxide is 1.0h -1 , the reaction pressure is 4.0Mpa, and the initial reaction temperature is 70°C. At regular intervals, sample analysis is carried out from the sampling port, and sodium thiosulfate is used for titration analysis to calculate the conversion rate of cumene hydroperoxide. After the epoxidation reaction was carried out for 2000 hours, when the reaction temperature rose to 120° C., the epoxidation reaction test was stopped, and the cumene hydroperoxide raw material was stopped first, and then the propylene raw material was stopped. At this time, the catalyst solvent regeneration test was carried out again. In the fixed-bed reactor, the cumene solvent is passed, and the cumene is injected at a weight space velocity of 1h -1 It flo...

Embodiment 2

[0024] In the epoxidation reaction, the reaction raw materials are cumene hydroperoxide and butene-1, and the reaction generates butylene oxide. Other oxidation reactions and regeneration conditions are the same as in Example 1. The reaction results are shown in Table 1.

Embodiment 3

[0026] The epoxidation reaction conditions were the same as in Example 1. During the catalyst solvent regeneration test, the temperature of the catalyst bed was controlled to 140°C, and the cumene was -1 Flow through the catalyst layer from the top, nitrogen enters the catalyst layer from the bottom with a flow rate of 3 l / min, and the outlet nitrogen tail gas enters the condensing system to cool the cumene solvent obtained and can return to the fixed-bed reactor. After passing through the cumene solvent for regeneration for 72 hours, the materials were switched, and the epoxidation reaction was carried out again through cumene hydrogen oxide and propylene raw materials. The reaction results are shown in Table 1.

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Abstract

The invention relates to a regeneration method of a titanium-silicon molecular sieve catalyst. The catalyst is filled in a fixed bed reactor and applied to preparing an epoxy compound through epoxidation reaction of an organic peroxide and alkene. In the process of regeneration of a titanium-silicon molecular sieve, a liquid solvent enters the fixed bed reactor from top to bottom, at the same time, nitrogen enters the reactor in a reverse mode, and liquid solvent which is obtained through cooling and separating tail gas of the nitrogen from the top by a condensing system can return to a fixed bed to be recycled. According to the regeneration method, the period for regenerating the catalyst by the liquid solvent is shortened, the activity recovery rate of the catalyst is increased, and the regeneration method can be applied to industrial production.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a method for regenerating a titanium-silicon molecular sieve catalyst. Background technique [0002] Propylene oxide is second only to polypropylene and surpasses acrylonitrile in the production of propylene derivatives, becoming the second largest propylene derivative. Butylene oxide is a raw material for organic synthesis, which can be used to manufacture organic synthesis intermediates and polymers, such as the production of 1,2-butanediol and butanolamine. It can also be used as a reactive diluent for epoxy resins, an antioxidant for chlorine-containing compounds, and an anti-corrosion agent. It is widely used in fine chemicals and petrochemicals. [0003] Industrial propylene oxide production processes mainly include chlorohydrin method, co-oxidation method, cumene hydroperoxide method, and hydrogen peroxide oxidation method. The co-oxidation method has a large investmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/90B01J29/89B01J38/58C07D301/19C07D303/04
CPCY02P20/584
Inventor 吴美玲周灵杰李军马颖涛
Owner CHINA PETROLEUM & CHEM CORP
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