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Method of reducing ammonia and nitrogen pollution in process of zeolite modification

A zeolite and modification technology, which is applied in the field of reducing ammonia nitrogen pollution in the process of zeolite modification, and achieves the effects of reducing the usage of ammonium salt, lowering the sodium content and reducing the ammonium salt content

Active Publication Date: 2008-07-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although the prior art introduces potassium metal elements into zeolites or catalysts, they all exist in zeolites or catalysts as modifying elements, and do not involve reducing the ammonia nitrogen pollution in the modification or preparation process of zeolites or catalysts

Method used

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  • Method of reducing ammonia and nitrogen pollution in process of zeolite modification

Examples

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Effect test

Embodiment 1

[0030] Under stirring, add 50g (dry basis) NaY to 400ml of water, add 10g of potassium chloride, 6ml of rare earth chloride, add 30ml of hydrochloric acid with a concentration of 18%, heat up to 85°C, keep warm for 1 hour, filter to form filter cake A , the thickness of the filter cake is about 5mm; add 15g of ammonium chloride to 250ml of water to form a solution, raise the temperature to 85°C, add it to the filter cake A, filter, and keep the filter vacuum at 0.06MPa to form the filter cake B. In a muffle furnace, the filter cake was calcined at a temperature of 600° C. for 1.5 h to obtain the zeolite A of the present invention.

Embodiment 2

[0032]Under stirring, add 50g (dry basis) of rare earth super stable Y to 400ml of water, add 5g of potassium carbonate, 2g of ammonium sulfate, add 10ml of 3M sulfuric acid, heat up to 85°C, keep warm for 0.5 hours, filter to form filter cake C, filter cake The thickness is about 5mm; add 10g of ammonium sulfate into 250ml of water to form a solution, raise the temperature to 60°C, add it to the filter cake C, filter, and keep the filter vacuum at 0.06MPa to form the filter cake D. In a muffle furnace, the filter cake was calcined at a temperature of 650° C. for 2 hours to obtain zeolite B of the present invention.

Embodiment 3

[0034] Under stirring, add 400ml of water to 50g (dry basis) Na / ZSM-5, add 3g of potassium nitrate, add 25ml of hydrochloric acid with a concentration of 18%, stir for 4 hours at a temperature of 15°C, filter to form filter cake E, filter The thickness of the cake is about 5mm; add 8g of ammonium nitrate to 250ml of water to form a solution, add it to the filter cake E, filter, and keep the filter vacuum at 0.04MPa to form the filter cake F. In a muffle furnace, the filter cake was calcined at a temperature of 700° C. for 1.5 h to obtain zeolite C of the present invention.

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Abstract

This invention relates to a method to reduce ammonia nitrogen pollution during the modification process of zeolite. The method comprises, in the process, exchanging sodium in the zeolite with potassium compounds, and then exchanging zeolite with ammonium salts. The ratio of potassium compounds to zeolite is 0.01~0.5, reaction temperature is 5-100DEG C, and the reaction time is 0.1-6 hours. The method will not increase the modification cost and can reduce ammonium salt use by 50%, therefore reducing ammonia nitrogen pollution and the burden of ammonia nitrogen wastewater treatment process and investment. It is an environmental technology for zeolite modification. The prepared zeolite catalyst has lower sodium content with catalytic activity basically unchanged or increased.

Description

technical field [0001] The invention relates to a method for reducing ammonia nitrogen pollution in the zeolite modification process. The method can greatly reduce the amount of ammonium salt used in the zeolite modification process, thereby reducing the ammonia nitrogen pollution. Background technique [0002] In the production of catalytic cracking catalysts, the traditional process uses ammonium salts to reduce the content of alkali metal sodium. Due to the different positions and steric hindrances of the sodium in the catalyst, especially its active components, it is necessary to make the sodium of the molecular sieve and the catalyst If the content meets the index requirements, it is often necessary to use excessive ammonium salts, which will inevitably produce high-concentration ammonia nitrogen sewage and cause environmental pollution. Ammonia nitrogen wastewater discharged into water bodies, especially in slow-flowing lakes and bays, is likely to cause a large number...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/42C02F1/28
CPCY02W10/37
Inventor 高雄厚孙书红张海涛赵旭涛张忠东汪毅
Owner PETROCHINA CO LTD
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