Phosphorus-containing aluminium sol adhesive for catalyst and its prepn

Abstract

The present invention relates to a phosphorus and aluminum containing sol for petroleum hydrocarbon cracking catalyst and its features are containing Al 2-10 wt%, P 5-20 wt% and no Cl, with its P / Al ratio being 1.2-6 and pH value being 1.0-2.5. The preparation process includes beating aluminium hydroxide or alumina capable of being peptized and deionized water to obtain a slurry with solid content of 15-35 wt%, adding concentrated phosphoric acid according to the required P / Al ratio while stirring, heating to 65-95 deg. and reaction for 15-90 min until becoming transparent colloid. The said phosphorus and aluminum containing sol without C1 may be used together with conventional chlorine-containing aluminum sol.

Description

technical field [0001] The invention relates to a phosphorus-containing aluminum sol binder which can be used for petroleum hydrocarbon cracking catalysts and a preparation method thereof. Background technique [0002] Abrasion resistance is one of the important indicators to measure the performance of cracking catalysts. For this reason, in cracking catalysts of molecular sieve type, especially with high molecular sieve content, aluminum sol with better bonding performance is often used as a binder. However, the use of aluminum sol also brings some problems. When it is used as a binder for hydrocarbon cracking catalysts, due to the high chlorine content, a large amount of hydrochloric acid gas will escape during the catalyst spray drying molding process, thereby corroding equipment and Cause environmental pollution; if the dechlorination step is not carried out to the catalyst after spray drying, the hydrochloric acid gas formed will destroy the crystal lattice of the mole...

AI Technical Summary

Problems solved by technology

However, there are also many shortcomings in using this phosphorus-containing aluminum sol as a binder.

One is that the preparation process of this binder requires steps such as high-temperature depolymerization and concentration, and the preparation method is relatively complicated; the other is that in order to ensure the stability and fluidity of the phosphorus-containing aluminum sol, the phosphorus content in the sol is limited. The P / Al (weight) ratio is lower than 0.25; the third is that compared with the aluminum sol, the chlorine content of this phosphorus-containing aluminum sol is reduced very little, and mainly relies on the use of chlorine-containing aluminum with a high Al / Cl (weight) ratio. Sol raw materials to improve its Al / Cl (weight) ratio, which is difficult to achieve industrially

As far as the present inventors know, there is no report of using chlorine-free phosphorus-containing aluminum sol in the preparation of molecular sieve type hydrocarbon cracking catalysts