A kind of multi-stage porous ltl molecular sieve and its synthesis method and application

A multi-stage pore and molecular sieve technology, applied in the field of molecular sieves, can solve the problems of multi-acid and alkali waste liquid, limited application, troubles, etc., and achieve the effects of increased yield of aromatics, simple synthesis method, and excellent catalytic performance

Active Publication Date: 2020-04-28
SYNFUELS CHINA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of post-treatment is cumbersome and will produce more acid-base waste liquid, which limits its application in industrial production.

Method used

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  • A kind of multi-stage porous ltl molecular sieve and its synthesis method and application
  • A kind of multi-stage porous ltl molecular sieve and its synthesis method and application
  • A kind of multi-stage porous ltl molecular sieve and its synthesis method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Add 100.3g KOH and 45.3g aluminum hydroxide to 1300g deionized water, stir evenly, transfer to a three-necked flask, react at 90°C for 12h, cool to room temperature to obtain clear KAlO 2 solution, K in the aluminum source solution 2 O: Al 2 o 3 The molar ratio is 2.56:1. In this solution, slowly add 668g silica sol (SiO 2 Content 30wt%), the initial sol was obtained after vigorous stirring. Take 59.52g PEG200 and dissolve in 200g deionized water to make PEG solution. The PEG solution was slowly added dropwise into the sol and continued to stir vigorously, aged at 20°C for 1h, then transferred to a dynamic kettle, and reacted at 170°C for 48h. After crystallization, the reactant was cooled to room temperature, filtered, washed with deionized water until neutral, dried at 85°C for 11 hours, and calcined at 450°C for 10 hours to obtain a hierarchically porous LTL zeolite.

[0050] Among them, the amount of aluminum hydroxide is Al 2 o 3 In terms of KOH, the amount...

Embodiment 2

[0053] Add 100.3g KOH and 45.3g aluminum hydroxide to 1200g deionized water, stir evenly, transfer to a three-necked flask, react at 100°C for 12h, and get clear KAlO after cooling to room temperature 2 solution, K in the aluminum source solution 2 O: Al 2 o 3 The molar ratio is 2.56:1. In this solution, slowly add 668g silica sol (SiO 2 Content 30wt%), the initial sol was obtained after vigorous stirring. Take 357.12g PEG600 and dissolve in 300g deionized water to make PEG solution. The PEG solution was slowly added dropwise into the sol and continued to stir vigorously, aged at 20°C for 1h, then transferred to a dynamic kettle, and reacted at 180°C for 48h. After crystallization, the reactant was cooled to room temperature, filtered, washed with deionized water until neutral, dried at 130°C for 3 hours, and calcined at 450°C for 6 hours to obtain a hierarchically porous LTL zeolite.

[0054] Among them, the amount of aluminum hydroxide is Al 2 o 3 In terms of KOH, th...

Embodiment 3

[0057] Add 100.3g KOH and 45.3g aluminum hydroxide to 1100g deionized water, stir evenly, transfer to a three-necked flask, react at 90°C for 10h, and cool to room temperature to obtain clear KAlO 2 solution, K in the aluminum source solution 2 O: Al 2 o 3 The molar ratio is 2.56:1. In this solution, slowly add 668g silica sol (SiO 2 Content 30wt%), the initial sol was obtained after vigorous stirring. Take 476.16g PEG800 and dissolve in 400g deionized water to make PEG solution. The PEG solution was slowly added dropwise into the sol and continued to stir vigorously, aged at 20°C for 5h, then transferred to a dynamic kettle, and reacted at 160°C for 24h. After crystallization, the reactant was cooled to room temperature, filtered, washed with deionized water until neutral, dried at 110°C for 12 hours, and calcined at 600°C for 4 hours to obtain a hierarchically porous LTL zeolite.

[0058] Among them, the amount of aluminum hydroxide is Al 2 o 3 In terms of KOH, the a...

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Abstract

The invention discloses a hierarchical pore LTL molecular sieve as well as a synthetic method and application thereof. The preparation method of the LTL molecular sieve comprises the following steps:(1) preparing a mixed aqueous solution of an aluminum source and a potassium source; (2) sequentially adding a silicon source and aqueous solution of polyethylene glycol into the mixed aqueous solution, and aging to obtain an initial sieve sol mixture; and (3) sequentially performing constant temperature crystallization and calcination on the initial sieve sol mixture, thereby obtaining the product. The synthetic method of the hierarchical pore LTL molecular sieve disclosed by the invention is simple, and the synthetic process is non-toxic and harmless. The LTL molecular sieve has a hierarchical pore structure, and mesopores of the molecular sieve are concentrated at 2-7nm; and the hierarchical pore LTL molecular sieve disclosed by the invention has excellent catalytic performance in an N-octane aromatization reaction, and compared with the traditional micro-porous LTL catalyst, the hierarchical pore LTL molecular sieve is capable of improving the aromatic yield by 20% or higher and has excellent industrial application prospects.

Description

technical field [0001] The invention relates to a multi-level pore LTL molecular sieve and its synthesis method and application, belonging to the technical field of molecular sieves. Background technique [0002] As one of the basic raw materials in the chemical industry, aromatics play an extremely important role in the petrochemical system. LTL molecular sieve has unique shape selectivity, strong basic center and good hydrothermal stability, and exhibits excellent catalytic performance in the aromatization reaction of C6-C8 alkanes. However, the one-dimensional twelve-membered ring channel structure has a large diffusion limit, and the generated aromatic hydrocarbons with higher carbon number (such as xylene) will continue to undergo secondary side reactions such as hydrogenolysis because they cannot diffuse out of the channel in time, resulting in aromatic structure. The chemical products are mainly benzene and toluene, which reduces the yield and liquid yield of aromati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/32B01J35/10B01J37/02B01J29/62C07C5/41C07C15/02C07C15/04C07C15/06
CPCB01J29/62B01J35/1019B01J35/1038B01J35/1061B01J37/0201B01J2229/18C01B39/32C01P2002/72C01P2004/03C01P2004/30C01P2004/61C01P2006/12C01P2006/17C07C5/417C07C2529/62C07C15/02C07C15/04C07C15/06Y02P20/52
Inventor 杨勇赵春利吴宝山陶智超云一峰黄丽华杨永陈骁李永旺
Owner SYNFUELS CHINA TECH CO LTD
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