A kind of synthetic method of low silicon aluminum ratio zsm-48 molecular sieve

A technology with a low silicon-aluminum ratio and a synthetic method, which is applied in the field of ZSM-48 molecular sieve preparation, can solve the problems of increasing the production cost of zeolite beta, not being able to recycle zeolite, and not having a regular pore structure of zeolite, achieving high crystallinity and reducing Pressure, the effect of reducing production costs

Inactive Publication Date: 2018-06-08
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the industrial production of zeolite beta, a large amount of synthetic waste liquid of zeolite beta will be produced at the same time. Since the waste liquid of zeolite beta synthesis contains alkali, silicon and organic templates and other species, it must be treated before it can be discharged, which increases the production of zeolite beta. Cost of production
At the same time, the silica-alumina species in these β zeolite synthesis waste liquids usually exist as primary or secondary structural units of zeolites, which do not have the regular pore structure of zeolites and cannot be recycled as zeolites.

Method used

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  • A kind of synthetic method of low silicon aluminum ratio zsm-48 molecular sieve
  • A kind of synthetic method of low silicon aluminum ratio zsm-48 molecular sieve
  • A kind of synthetic method of low silicon aluminum ratio zsm-48 molecular sieve

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 2.35g of sodium aluminate (containing 41wt% Al 2 o 3 and 35wt%Na 2 (2) and 50 mL of water to form a uniform solution, add 21.4 g of white carbon black and stir vigorously, crystallize at 140° C. for 10 days, separate the solid and liquid, and collect the synthetic waste liquid of zeolite beta.

[0025] The above waste liquid contains 3.0wt% SiO 2 , 0.2wt% Na 2 O, 0.01wt% Al 2 o 3 . Take a small amount of waste liquid, evaporate the solvent to dryness, and roast to remove the implicit template agent. The infrared spectroscopic characterization of the calcined solid and β zeolite was compared, and the results were as follows: figure 1 , the 525, 570 cm of β zeolite was not found in the infrared spectrum of the solid obtained by roasting the waste liquid -1 The characteristic peaks indicate that in the collected synthetic waste liquid of zeolite β, the silicon-aluminum elements are not in the form of zeolite β, but in other forms such as primary or secondary st...

Embodiment 2

[0028] 2.68g sodium aluminate (containing 41wt%Al 2 o 3 and 35wt%Na 2O), 22.63g of tetraethylammonium bromide and 1.46g of sodium hydroxide (98wt%) were added to 60mL of water to form a homogeneous solution, and then 23mL of ammonia (27wt%) and 43mL of silica sol (40wt%, pH9) were added under vigorous stirring , 140 ° C crystallization reaction for 8 days, the solid and liquid were separated, and the β zeolite synthesis waste liquid was collected. Waste liquid contains 2.9wt% SiO 2 , 0.2wt% Na 2 O, 0.01wt% Al 2 o 3 .

[0029] Get above-mentioned β zeolite synthetic waste liquid 48g and mix with 15mL water, add 1.2g hexamethylammonium bromide, 0.37g sodium metaaluminate (containing 45wt% Al 2 o 3 and 42.6wt%Na 2 O), 0.63g sodium hydroxide are made into solution, then add 8.8g gas phase SiO 2 , stirred evenly, put into a reaction kettle lined with polytetrafluoroethylene, and crystallized at 160°C for 48 hours. After the crystallization was complete, it was rapidly co...

Embodiment 3

[0031] 2.48g sodium aluminate (containing 41wt%Al 2 o 3 and 35wt%Na 2 O), 20.16g of tetraethylammonium bromide and 1.6g of sodium hydroxide were added into 92mL of water to form a homogeneous solution, and then 20.16g of white carbon black was added, stirred evenly and then crystallized at 140°C for 10 days, separated from solid and liquid, and collected to obtain β Zeolite synthesis waste liquid.

[0032] Take 48g of the above-mentioned synthetic waste liquid of zeolite beta, mix it with 12mL of water, add 1.02g of hexamethylammonium bromide, 0.39g of sodium metaaluminate (containing 45wt% Al 2 o 3 and 42.6wt%Na 2 O), 0.78g sodium hydroxide are made into solution, then add 9g gas phase SiO 2 , stirred evenly, put into a reaction kettle lined with polytetrafluoroethylene, and crystallized at 160°C for 72 hours. After the crystallization was complete, it was rapidly cooled to room temperature, centrifuged and washed to obtain a solid product. It is a pure phase ZSM-48 mo...

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Abstract

The invention discloses a synthetic method of a ZSM-48 molecular sieve with a low silica-alumina ratio. The ZSM-48 molecular sieve with the low silica-alumina ratio is prepared by the following steps: beta-zeolite synthesis waste liquid is used as a raw material part; the raw material, an organic template, a silicon source, an aluminium source, an alkali source and water are mixed into a gel mixture; a hydrothermal crystallization reaction is carried out, in order to obtain the ZSM-48 molecular sieve with the low silica-alumina ratio (SiO2 / Al2O3) which is lower than 100. In a condition without addition of crystal seed, silicon and aluminium substances existed in the heterogeneous molecular sieve waste liquid in primary and secondary constitutional unit forms are used for inducing synthesis of ZSM-48, and a novel and convenient synthesis approach with low cost is provided for preparing the ZSM-48 molecular sieve with the low silica-alumina ratio.

Description

technical field [0001] The invention relates to a preparation method of ZSM-48 molecular sieve, in particular to a method for preparing ZSM-48 molecular sieve with low silicon-aluminum ratio by using waste liquid synthesized by beta zeolite molecular sieve as nutrient components. Background technique [0002] With the rapid growth of the demand for petroleum products in industrial and agricultural production and daily life and the continuous enhancement of people's awareness of environmental protection, environmentally friendly high-octane number alkylated gasoline, high cetane number diesel oil and high viscosity index, low freezing point The demand for high-grade lubricants is increasing day by day. Isomerization dewaxing technology based on catalytic isomerization reaction is the most effective method to produce environmentally friendly new fuel oil rich in branched alkanes, and has broad application prospects. ZSM-48 zeolite molecular sieve has one-dimensional straight ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/04
CPCC01B39/04C01P2002/72C01P2002/82
Inventor 李瑞丰杜艳泽唐静思陈晓芳秦波郑家军孙晓勃潘梦李鹏高禾鑫张鸿雁
Owner TAIYUAN UNIV OF TECH
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