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Method for preparing composite catalyst by extracting aluminum from phosphogypsum

A composite catalyst and phosphogypsum technology, which is applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low selectivity, short life of ZSM-5, high reaction temperature, etc., and achieve high reactivity, The effect of weakening the diffusion of molecules and reducing the temperature of catalytic reaction

Pending Publication Date: 2019-07-12
中建西部建设贵州有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the above problems, based on the fact that phosphogypsum also contains impurities such as phosphoric acid, aluminum, silicon, and iron in addition to the main component calcium sulfate, and the acid-base precipitation method is now used to extract the aluminum in the phosphogypsum impurities to obtain AlCl 3 ·6H 2 O, synthesize γ-Al with template 2 o 3 Composite with ZSM-5 catalyst to form γ-Al 2 o 3 @ZSM-5 composite catalyst to solve the problems of short life, high reaction temperature and low selectivity of single ZSM-5 in the reaction of preparing other chemical products from methanol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing composite catalyst by extracting aluminum from phosphogypsum, comprising the following steps:

[0038] Step 1: Acid leaching waste gypsum: according to the liquid-solid ratio of 20mL / g, add dilute hydrochloric acid with a concentration of 1mol / L to the dried waste gypsum powder, stir and leaching at an acid leaching temperature of 80°C for 1h, centrifuge, and take supernatant;

[0039] Step 2: Separation and purification of aluminum: add sodium hydroxide solution to the supernatant obtained in step 1 for solid-liquid separation, take the supernatant and add dilute hydrochloric acid with a concentration of 1 mol / L until the white precipitate is completely dissolved to generate chlorine Aluminum solution, concentrated by evaporation, cooled and crystallized, filtered to obtain AlCl 3 ·6H 2 o

[0040] Step 3: preparation of composite catalyst:

[0041] Step 3.1: γ-Al 2 o 3 Preparation: AlCl according to the molar ratio of raw materials 3 ·6H ...

Embodiment 2

[0045] A method for preparing composite catalyst by extracting aluminum from phosphogypsum, comprising the following steps:

[0046] Step 1: Acid leaching waste gypsum: according to the liquid-solid ratio of 20mL / g, add dilute hydrochloric acid with a concentration of 1mol / L to the dried waste gypsum powder, stir and leaching at an acid leaching temperature of 80°C for 1h, centrifuge, and take supernatant;

[0047] Step 2: Separation and purification of aluminum: add sodium hydroxide solution to the supernatant obtained in step 1 for solid-liquid separation, take the supernatant and add dilute hydrochloric acid with a concentration of 1 mol / L until the white precipitate is completely dissolved to generate chlorine Aluminum solution, concentrated by evaporation, cooled and crystallized, filtered to obtain AlCl 3 ·6H 2 O solution.

[0048] Step 3: preparation of composite catalyst:

[0049] Step 3.1: γ-Al 2 o 3 Preparation: AlCl according to the molar ratio of raw material...

Embodiment 3

[0053] A method for preparing composite catalyst by extracting aluminum from phosphogypsum, comprising the following steps:

[0054] Step 1: Acid leaching waste gypsum: according to the liquid-solid ratio of 20mL / g, add dilute hydrochloric acid with a concentration of 1mol / L to the dried waste gypsum powder, stir and leaching at an acid leaching temperature of 80°C for 1h, centrifuge, and take supernatant;

[0055] Step 2: Separation and purification of aluminum: add sodium hydroxide solution to the supernatant obtained in step 1 for solid-liquid separation, take the supernatant and add dilute hydrochloric acid with a concentration of 1 mol / L until the white precipitate is completely dissolved to generate chlorine Aluminum solution, concentrated by evaporation, cooled and crystallized, filtered to obtain AlCl 3 ·6H 2 O solution.

[0056] Step 3: preparation of composite catalyst:

[0057] Step 3.1: γ-Al 2 o 3 Preparation: AlCl according to the molar ratio of raw material...

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Abstract

The invention discloses a method for preparing a composite catalyst by extracting aluminum from phosphogypsum, comprising the following steps: carrying out acid leaching of waste gypsum, separating and purifying aluminum to prepare gamma-Al2O3, and modifying ZSM-5 by using the prepared gamma-Al2O3 sample to obtain the composite catalyst. By the method, part of impurities in phosphogypsum are removed to realize recycling of the phosphogypsum solid waste; and by the utilization of properties of impurities, the prepared gamma-Al2O3(at)ZSM-5 composite catalyst has long life, product selectivity ishigh, and reaction temperature is reduced.

Description

technical field [0001] The invention relates to a method for preparing a composite catalyst by extracting aluminum from phosphogypsum, which belongs to the field of catalyst preparation. Background technique [0002] ZSM-5 catalyst is used in the field of preparing other chemical products from methanol. It has a relatively large pore structure and relatively low product selectivity. Usually, ZSM-5 is modified by modifying to prepare hierarchically porous molecular sieves to narrow the pores and enhance the shape-selective function, thereby improving product selectivity. In addition, in the reaction process of preparing other chemical products with methanol, the temperature is mostly above 400 °C, and the carbon deposit formation rate has an exponential growth relationship with the reaction temperature, which makes the catalyst life short. Therefore, the modified composite catalyst can reduce the reaction temperature of the system, effectively alleviate the formation rate of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40
CPCB01J29/40
Inventor 王乐王军林喜华袁义进李小涛赵士豪路东义何凯
Owner 中建西部建设贵州有限公司
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