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A kind of method for preparing propylene by extracting aluminum modified composite catalyst from phosphogypsum

A composite catalyst, aluminum modification technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of short life and low selectivity of ZSM-5, and achieve the purpose of alleviating the formation of carbon deposits, enhancing the The degree of adsorption and dissociation, the effect of improving selectivity

Active Publication Date: 2022-04-22
中建西部建设贵州有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 aluminum in the phosphogypsum impurities is extracted by acid-base precipitation method 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 problem of short lifetime and low selectivity of single ZSM-5 in MTP reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1.1: Acid leaching of waste gypsum: Add dilute hydrochloric acid to the dried waste gypsum powder according to the liquid-solid ratio of 20mL / g, stir and leaching for 1 hour at an acid leaching temperature of 80°C, centrifuge, take the supernatant, and obtain Sodium hydroxide solution was added to the supernatant of the solution for solid-liquid separation, and dilute hydrochloric acid was added to the supernatant until the white precipitate was completely dissolved to form an aluminum chloride solution, which was concentrated by evaporation, crystallized by cooling, and filtered to obtain AlCl 3 ·6H 2 O; wherein the dilute hydrochloric acid concentration is 1mol / L,

[0030] Step 1.2: γ-Al 2 o 3 Preparation: AlCl according to the molar ratio of raw materials 3 ·6H 2 O:CTAB=12.9-13.2:1-3, add cetyltrimethylammonium bromide CTAB to the AlCl prepared in step 1.1 3 ·6H 2 O solution, stir until dissolved, use a peristaltic pump at 5mL·min -1 The rate pumped into ...

Embodiment 2

[0036] Step 1.1: Acid leaching of waste gypsum: Add dilute hydrochloric acid to the dried waste gypsum powder according to the liquid-solid ratio of 20mL / g, stir and leaching for 1 hour at an acid leaching temperature of 80°C, centrifuge, take the supernatant, and obtain Sodium hydroxide solution was added to the supernatant of the solution for solid-liquid separation, and dilute hydrochloric acid was added to the supernatant until the white precipitate was completely dissolved to form an aluminum chloride solution, which was concentrated by evaporation, crystallized by cooling, and filtered to obtain AlCl 3 ·6H 2 O solution; wherein the dilute hydrochloric acid concentration is 1mol / L,

[0037] Step 1.2: γ-Al 2 o 3 Preparation: AlCl according to the molar ratio of raw materials 3 ·6H 2 O:CTAB=12.9-13.2:1-3, add cetyltrimethylammonium bromide CTAB to the AlCl prepared in step 1.1 3 ·6H 2 O solution, stir until dissolved, use a peristaltic pump at 5mL·min -1 The rate pum...

Embodiment 3

[0043] Step 1.1: Acid leaching of waste gypsum: Add dilute hydrochloric acid to the dried waste gypsum powder according to the liquid-solid ratio of 20mL / g, stir and leaching for 1 hour at an acid leaching temperature of 80°C, centrifuge, take the supernatant, and obtain Sodium hydroxide solution was added to the supernatant of the solution for solid-liquid separation, and dilute hydrochloric acid was added to the supernatant until the white precipitate was completely dissolved to form an aluminum chloride solution, which was concentrated by evaporation, crystallized by cooling, and filtered to obtain AlCl 3 ·6H 2 O solution; wherein the dilute hydrochloric acid concentration is 1mol / L,

[0044] Step 1.2: γ-Al 2 o 3 Preparation: AlCl according to the molar ratio of raw materials 3 ·6H 2 O:CTAB=12.9-13.2:1-3, add cetyltrimethylammonium bromide CTAB to the AlCl prepared in step 1.1 3 ·6H 2 O solution, stir until dissolved, use a peristaltic pump at 5mL·min -1 The rate pum...

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PUM

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Abstract

The invention discloses a method for extracting phosphogypsum from an aluminum-modified composite catalyst to prepare propylene, comprising the following steps: acid leaching waste gypsum, separating and purifying aluminum to prepare γ-Al 2 o 3 , with the prepared γ‑Al 2 o 3 The sample is modified on ZSM-5 to obtain a composite catalyst, and now the methanol liquid gasification is fully contacted with the catalyst to obtain the product propylene. On the one hand, this method removes some impurities in phosphogypsum, realizes the recycling of phosphogypsum solid waste, and at the same time utilizes the properties of the impurities themselves to prepare γ‑Al 2 o 3 The @ZSM‑5 composite catalyst has a long service life and a high selectivity to propylene.

Description

technical field [0001] The invention relates to a composite material prepared by extracting aluminum from phosphogypsum, which is applied to the research on the reaction of methanol to propylene, and belongs to the field of propylene preparation. Background technique [0002] In the field of catalytic cracking reactions of hydrocarbons, ZSM-5 catalyst has a relatively large pore structure and relatively low selectivity for low-carbon olefins. The carbon deposit formation rate increases exponentially with the reaction temperature, resulting in a short catalyst life. In the methanol olefination reaction, there are many factors affecting the formation of olefin products, among which the acid strength and pore structure of the catalyst are more critical aspects, and the product selectivity is low when using a single ZSM-5 catalyst. [0003] Phosphogypsum is the main solid waste in the wet-process phosphoric acid industry, producing 1t of wet-process phosphoric acid (in P 2 o ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40C07C1/20C07C11/06
CPCB01J29/40C07C1/20B01J2229/186C07C11/06Y02P20/52
Inventor 王乐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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