Aluminum phosphate sol and preparation method thereof

Abstract

The invention relates to aluminum phosphate sol and a preparation method thereof. The aluminum phosphate sol contains the following components in percentage by mass: 10%-50% of Al2O3, 0.5%-10% of soluble salt with an anion of C6H7O7<-> or CH2COO<-> or HCOO<-> and 1.5%-15% of P. The preparation method comprises the following steps: (1) stirring pseudo-boehmite, the soluble salt with the anion of C6H7O7<-> or CH2COO<-> or HCOO<-> and deionized water, and standing; and (2) uniformly stirring the slurry obtained in the step (1), and adding phosphoric acid or a mixture of phosphoric acid and phosphate. The aluminum phosphate sol is used for preparing a catalyst, so that the environmental pollution caused by chloride ions and nitrate ion is avoided; the aluminum phosphate sol can be directly used as a bonder of a catalytic cracking catalyst; and the heating is not required during the preparation, a preparation process is simple, high in phosphorus-aluminum ratio, the range is adjustable, and the industrial production is easily realized.

Description

technical field [0001] The invention relates to an aluminum sol and a preparation method thereof, in particular to a phosphorus-aluminum sol for a catalytic cracking catalyst and a preparation method thereof. Background technique [0002] Aluminum sol is one of the most important binders in the preparation of catalytic cracking catalysts, and the properties of aluminum sol directly affect the performance of catalytic cracking catalysts. Due to the high chlorine content in the commonly used aluminum sol, hydrochloric acid is generated during the catalyst spray drying molding process, which corrodes equipment and affects the environment. At the same time, the formed hydrochloric acid gas will also destroy the structure of molecular sieves in the catalyst, reducing the activity of the catalyst. [0003] In order to reduce the impact of chlorine in aluminum sol on the catalyst and the environment, the method of partially replacing aluminum sol with phosphorus-containing aluminum...

AI Technical Summary

Problems solved by technology

Although the phosphorus-containing aluminum sol provided by CN1417296A does not contain chlorine, it still inevitably contains a large amount of chlorine in the slurry before spray-drying and after spray-drying due to being mixed with the chlorine-containing aluminum sol during its preparation of catalyst, resulting in Equipment corrosion and environmental pollution problems still exist

Although this method can solve the problem of chloride ions, the decomposition of introduced nitrate in the catalyst roasting process will also cause serious environmental pollution.

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