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Dechlorinating method for catalystic reforming reaction product

A reaction product and reforming reaction technology, which is applied in the fields of metal oxide refining, petroleum industry, and metal refining, can solve the problems of frequent replacement of dechlorination agents, low chlorine capacity of dechlorination agents, and many dechlorination processes. Achieve the effects of simplifying the reforming dechlorination process, avoiding corrosion, and improving dechlorination efficiency

Active Publication Date: 2012-09-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0008] In summary, for the reforming unit, the removal of hydrogen chloride in the reformed product requires at least three dechlorination processes, that is, the liquid phase dechlorination of pentane oil, the extraction of aromatics raw materials (the The liquid-phase dechlorination of the reformed product) and the gas-phase dechlorination of the reformed hydrogen used in the downstream hydrogenation unit, due to the harsh process conditions (low temperature, liquid phase), there are many dechlorination processes and the chlorine capacity of the dechlorination agent is low , Frequent replacement of dechlorination agent

Method used

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  • Dechlorinating method for catalystic reforming reaction product

Examples

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preparation example Construction

[0017] The preparation method of the above-mentioned dechlorination agent comprises mixing evenly the alkaline earth metal hydroxide and the precursor of the binder, adding an aqueous solution containing a peptizer, kneading evenly, extruding, drying, and roasting to obtain the dechlorination agent. The peptizer is preferably nitric acid, acetic acid or citric acid, the precursor of the binder is preferably hydrated alumina, aluminum sol or silica sol, the drying temperature is preferably 100-130°C, the time is preferably 1-4 hours, and the calcination temperature is preferably 300-600°C. °C, the time is preferably 2 to 6 hours.

[0018] The method of the present invention is suitable for semi-regenerative reforming and continuous reforming devices, after the last reactor of the reforming reactor, the dechlorination tank is connected in series, and the waste heat of the reforming reaction product (reforming to generate oil and reforming hydrogen) is utilized, the temperature I...

example 1

[0023] Preparation of the dechlorination agent used in the method of the present invention.

[0024] Take Ca(OH) 2 Mix evenly with pseudo-boehmite in a mass ratio of 73:40, add nitric acid that accounts for 3 mass% of the total material and be 30 mass% nitric acid as a peptizer after kneading in a kneader, and use a diameter of 2mm orifice plate to extrude Extrude strips on a strip machine, and the extruded strips are pelletized, dried at 110°C for 3 hours, and roasted at 600°C for 4 hours to obtain dechlorination agent A, which contains 70% by mass of calcium oxide and 30% by mass of aluminum oxide.

example 2

[0026] This example illustrates the dechlorination effect of the present invention on a semi-regenerative reformer.

[0027] The reformed reaction product with a chlorine content of 5 μg / L flowing out from the final reactor of the semi-regenerative reforming reactor is passed into a dechlorination tank filled with dechlorination agent A, and is heated at 480 ° C, 1.2 MPa, and the feed volume is empty. Speed ​​is 1000 hours -1Dechlorination is carried out under certain conditions, and the change of chlorine content in the outlet material of the dechlorination tank is monitored. When the chlorine content in the outlet material of the dechlorination tank is greater than 0.5 μg / L, the dechlorination agent is replaced to ensure the continuous and stable operation of the reforming unit. The breakthrough chlorine capacity of the dechlorination agent was 35% by mass. The breakthrough chlorine capacity is the chlorine content contained in the dechlorination agent when the chlorine con...

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Abstract

A dechlorinating method for a catalystic reforming reaction product comprises the steps: directly leading the reforming reaction product flowing from a reforming reactor to a dechlorinating agent bed layer; and removing chlorine in the product at the temperature of 480-520 DEG C, the pressure of 0.35-2.0 Mpa, and feed space velocity of 20-4000 hours <-1>. The method can be used for removing the chlorine in the reforming product, and the dechlorinating efficiency of the dechlorinating agent can also be improved.

Description

technical field [0001] The invention relates to a method for gas phase removal of hydrogen chloride in hydrocarbon raw materials, in particular to a method for dechlorination of catalytic reforming reaction products. Background technique [0002] Continuous reforming is the main process technology for the production of aromatics and high-octane gasoline components. [0003] During the reforming reaction process, the chlorine on the reforming catalyst will be continuously lost. In order to maintain the reforming catalyst with a certain acidity and high reactivity, it is necessary to continuously inject water and organic chlorine during operation. Chemicals, water chlorine balance control. During the reaction process, except for a certain amount of chlorine retained by the reforming catalyst, other chlorine entering the reaction system will be dissolved in the reformed oil and reformed circulating hydrogen. [0004] Generally, the chlorine content of the reformed oil is 2-4 ...

Claims

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Application Information

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IPC IPC(8): C10G29/00C10G29/16C10G29/04
Inventor 张秋平王京红
Owner CHINA PETROLEUM & CHEM CORP
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