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Prepn process of hyperastable Y-type RE molecular sieve

A molecular sieve and rare earth technology, which is applied in the field of hydrocarbon cracking molecular sieve preparation, can solve problems not involving the formation of oxalic acid rare earth precipitation, etc.

Inactive Publication Date: 2003-08-20
PETROCHINA CO LTD
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AI Technical Summary

Problems solved by technology

Chinese patents CN 86107531A and CN86107598A reported a similar rare earth introduction method, that is, RE(OH) 3 Introducing rare earths to the precursors; the dealuminated complexing agents used in Chinese patents CN 1042523A and CN 1031500C include: oxalic acid, ammonium oxalate, ethylenediaminetetraacetic acid and edetate, but do not involve the formation of rare earth oxalate precipitates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1000g (dry basis) NaY(SiO 2 / Al 2 o 3 ≥4.5) Add 10 liters of about 5% ammonium chloride solution, make a pulp, add 230 grams of oxalic acid, add about 135 milliliters of concentrated ammonia water, stir and add dilute hydrochloric acid dropwise, the pH of the slurry is 3.2, after that, stir and react at 93°C for 1 hours, add RECl at the end of the reaction 3 The solution was 475 ml, fully stirred, filtered, washed with water, and the wet filter cake itself was treated with water vapor for 2 hours to obtain a novel rare earth-containing ultrastable Y molecular sieve A.

Embodiment 2

[0039] Same as in Example 1, except that 230 grams of oxalic acid was replaced by 150 grams of oxalic acid and 93 grams of ethylenediaminetetraacetic acid to obtain ultra-stable Y molecular sieve B containing rare earth. Example 3

Embodiment 3

[0040] With embodiment 1, just with RECl 3 The solution was changed to RE(NO 3 ) 3 Solution, the addition amount is 238 milliliters, makes ultrastable Y molecular sieve C containing rare earth. Comparative example 1

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PUM

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Abstract

The present invention relates to the preparation of hyperstable Y-type RE molecular sieve for the catalytic cracking of heavy oil and containnig vanadium resisting component. The preparation uses NaY-type molecular sieve as main material and chemical aluminum-eliminating complex containing oxalic acid and / or oxalate and its mixture and through introducing RE ion in the late stage of chemical aluminum elimination reaction to from RE precipitate and hydrothermal treatment to realize hyperstabilizing and introduce RE ion and independent phase Re oxide. The formed precipitate RE precursor includes RE oxalate. Compared with conventional REY, REHY and REUSY, the molecular sieve preparing process is simple and high in RE utilization, and has homogeneously distributed aluminum, more secondary pores high hydrothermal stability, high activity and high vanadium contamination resisting capacity.

Description

technical field [0001] The invention relates to a method for preparing hydrocarbon cracking molecular sieves. To be precise, it is a preparation method of rare earth ultra-stable Y-type molecular sieve suitable for heavy oil cracking, especially heavy oil cracking with high vanadium content. Background technique [0002] Looking at the changes in catalytic cracking feedstock oil at home and abroad, the feedstock for catalytic cracking has changed from traditional vacuum wide distillate oil to residual oil or residual oil, because residual oil contains more heavy metals (nickel, vanadium, etc.), Colloids and asphaltenes make cracking catalysts face problems such as how to improve coke selectivity and anti-heavy metal pollution performance. [0003] In the cracking reaction, due to the deposition of metals such as nickel and vanadium on the catalyst, the activity of the catalyst is reduced. Therefore, it is necessary to continuously unload and replenish new catalyst from the ...

Claims

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Application Information

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IPC IPC(8): B01J29/08C01B39/06C01B39/24
Inventor 庞新梅孙书红赵连鸿丁伟张永明
Owner PETROCHINA CO LTD
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