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Regeneration method for catalyst containing precious metal and molecular sieve

A catalyst and noble metal technology, applied in the field of deactivated catalyst regeneration, can solve the problems of difficult separation of macromolecular by-products, molecular sieve structure damage, metal platinum aggregation, etc., to improve hydrogenation/dehydrogenation reaction activity, improve dispersion, good Dispersion effect

Active Publication Date: 2015-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of solvent used in this method is too large, and the macromolecular by-products in the detergent are also difficult to separate.
Moreover, this method first uses an organic solvent to remove part of the easy-to-remove coke to reduce the heat released during charcoal regeneration, but ultimately still requires a high-temperature charcoal burning process, and there are still problems encountered by isomerization dewaxing catalysts during high-temperature regeneration. , especially the aggregation of metal platinum and the destruction of the molecular sieve structure

Method used

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  • Regeneration method for catalyst containing precious metal and molecular sieve
  • Regeneration method for catalyst containing precious metal and molecular sieve
  • Regeneration method for catalyst containing precious metal and molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Preparation of Catalyst E-1 of the Invention.

[0033] Add 1450ml of organic solvent (the volume ratio of ethanol and benzene is 2:1) into a 2000ml flask, and carry out deactivation of the catalyst (FD-1, Pt content 0.45 wt%, carbon content 7.24wt% the same below) after industrial operation. After processing, the catalyst number after 2 hours of distillation was Ca-1.

[0034] Take 120g of Ca-1 catalyst, add 14.4g of zinc nitrate (Zn content 5.0wt%) solution for impregnation, and prepare a Zn-containing sample with an atomic ratio of Zn to Pt of 4:1, and then at a heating rate of 3°C / min, Raise the temperature to 250°C for 10 hours, and then continue to raise the temperature to 410°C for 3 hours at a rate of 3°C / min. The obtained catalyst is numbered Ea-1.

[0035] Add 8.5wt% (as HNO 3 Add 100 g of the above-mentioned catalyst Ea-1 to 300 g of nitric acid aqueous solution, soak at room temperature for 10 hours, and then dry at 120° C. for 10 h to obtain catalyst E-1 o...

Embodiment 2

[0037] The preparation of catalyst E-2 of the present invention

[0038] Take 120g of Ca-1 catalyst, add 15g of zinc acetate (Zn content 10.0wt%) solution for impregnation to prepare a Zn-containing sample, wherein the atomic ratio of Zn to Pt is 5:1, and then heat up at a rate of 3°C / min , heated to 230° C. for 10 hours, and then continued to heat up to 420° C. for 3 hours at a rate of 3° C. / min. The obtained catalyst was numbered Eb-1.

[0039] Add 7.5wt% (as HNO 3 Add 100 g of the above-mentioned catalyst Eb-1 to 300 g of nitric acid aqueous solution, soak at room temperature for 5 hours and then dry at 110° C. for 8 hours to obtain catalyst E-2 of the present invention.

Embodiment 3

[0041] The preparation of catalyst E-3 of the present invention

[0042] Add 1450ml of organic solvent (the volume ratio of gasoline and kerosene is 1:1) into a 2000ml flask to treat the deactivated catalyst FD-1 after industrial operation, and the catalyst number after 2 hours of distillation is Cb-1.

[0043] Take 120g of Cb-1 catalyst, add 72g of zinc nitrate (Zn content 2.0wt%) solution for impregnation to prepare a Zn-containing sample, wherein the atomic ratio of Zn to Pt is 8:1, and then heat up at a rate of 3°C / min , heated to 280°C for 8 hours, and then continued to heat up to 350°C for 5 hours at a rate of 3°C / min. The obtained catalyst was numbered Ec-1.

[0044] Add 15% (as HNO 3 Add 100 g of the above-mentioned catalyst Ec-1 to 300 g of nitric acid aqueous solution, soak at room temperature for 10 hours, and then dry at 120° C. for 10 hours to obtain the catalyst E-3 of the present invention. Its physical and chemical properties are shown in Table 3, and the rea...

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Abstract

The invention discloses a regeneration method for a catalyst containing a precious metal and a molecular sieve. The catalyst comprises a TON type molecular sieve and a group-VIII precious metal component. The regeneration method comprises the following steps: treating the deactivated catalyst with an organic solvent at first; then loading zinc on the treated catalyst, wherein the atomic ratio of zinc to platinum is 10:1 to 1:1; carrying out programmed charking under the action of oxygen-containing gas, wherein the highest temperature in the process of charking is lower than 450 DEG C; carrying out washing with nitric acid; and then carrying out drying so as to obtain a regenerated catalyst. The regeneration method provided by the invention has the following advantages: carbon deposit can be effectively removed at a low temperature, the pore structure of the catalyst can be protected from destroy, accumulation of the precious metal is avoided, and the precious metal is well dispersed, so the reactive performance of the regenerated catalyst can be restored to the reactive performance level of a fresh catalyst. The method is particularly applicable to regeneration of deactivated hydroisomerization dewaxing catalysts.

Description

technical field [0001] The invention relates to a regeneration method of a deactivated catalyst. More specifically, it relates to a regeneration method of a hydroisomerization catalyst containing noble metals and TON molecular sieves, especially a regeneration method of a paraffin hydrocarbon hydroisomerization catalyst, which is especially suitable for the hydroisomerization deactivation of lubricating oil. Catalyst regeneration method used in wax process. Background technique [0002] Isomerization dewaxing technology is mainly used in the hydrogenation treatment of diesel oil, wax oil and other special oil products to achieve the purpose of reducing the content of normal paraffins and improving the quality of oil products. This technology is also of great significance for improving the low-temperature fluidity of diesel oil. Generally speaking, the wax content in straight-run diesel oil or secondary processed diesel oil is high, so its freezing point or cold filter poin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J29/90B01J38/02B01J38/56B01J38/64
Inventor 徐会青贾立明王伟刘全杰
Owner CHINA PETROLEUM & CHEM CORP
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