Regeneration method of toluene disproportionation catalyst

A toluene disproportionation and catalyst technology, which is applied in the direction of catalyst regeneration/reactivation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of inability to realize automatic operation of the device, long analysis time, complicated operation, etc., and achieves easy operation. , good technical effect, the effect of improving work efficiency

CN103657743AActive Publication Date: 2014-03-26CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2014-03-26

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Abstract

The invention relates to a regeneration method of a toluene disproportionation catalyst, which mainly aims to solve the problems in the prior art that the regeneration degree of the toluene disproportionation catalyst is judged only from experiences or by analyzing the carbon deposition amount through TGA (Thermal Gravity Analysis) for further judging whether the generation of catalyst is completed, and the process is complex in operation, high in error and long in analysis time, and the regeneration degree of the catalyst cannot be judged timely. According to the technical scheme of the invention, the catalyst regeneration atmosphere is divided into two parts, and the concentrations of carbon oxide and carbon dioxide in the regeneration atmosphere are respectively detected, so that the regeneration degree of the toluene disproportionation catalyst can be judged timely, the problems are solved well, and the regeneration method of the toluene disproportionation catalyst can be applied to the regeneration industrial production of the toluene disproportionation catalyst.
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Description

technical field

[0001] The invention relates to a regeneration method of a toluene disproportionation catalyst. Background technique

[0002] Para-xylene in xylene is one of the main basic organic raw materials in the petrochemical industry. It is widely used in chemical fiber, synthetic resin, pesticide, medicine, plastic and many other chemical production fields. In 1989, the toluene disproportionation catalyst developed by Shanghai Petrochemical Research Institute of China Petroleum and Chemical Corporation was industrialized, that is, toluene and C9 aromatics were used as raw materials, catalyzed by the toluene disproportionation catalyst in a fixed bed reactor, and disproportionation and transalkylation reactions occurred , producing benzene and xylene.

[0003] U.S. Patent USP5030787 has reported a kind of improved toluene disproportionation / C 9 Aromatic hydrocarbon transalkylation process, the patent uses a zeolite catalyst that has been protonated and ion-exchanged...

Examples

Embodiment 1

[0026] Refer to attached figure 1 , the gas chromatograph used is Agilent 6890, equipped with double valves, double TCD and two capillary column injection ports to provide two paths of carrier gas, the carrier gas is high-purity helium. Column 1 is HP-Molesieve 30mx0.53mmx40μm, column 2 is HP-PLOT Q 30mx0.53mmx20μm. The chromatographic conditions are as follows:

[0027] Column 13: 5? molecular sieve column, carrier gas, helium, 4ml / min;

[0028] Column 14: PLOT-Q column, carrier gas, helium, 4ml / min;

[0029] TCD temperature is 180°C;

[0030] Injector temperature is 140 DEG C; split ratio, 50:1;

[0031] Injection volume: 250 microliters;

[0032] When preparing for sample injection, the six-way valves 10 and 11 are in the OFF state. Open the ball valve 4, and the sample gas, that is, the regenerated product of the toluene disproportionation catalyst, flows through the tee 5, and then passes through the quantitative tubes 6, 7 of the six-way valves 10, 11 to the vent o...