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Synthetic method for ZSM-5 zeolite

A synthesis method, the technology of ZSM-5, applied in chemical instruments and methods, crystalline aluminosilicate zeolite, borocarbonane silicone crystalline aluminosilicate zeolite, etc., can solve the problems of high price, complicated process, waste of resources, etc. , to achieve the effect of reducing the cost of synthesis

Inactive Publication Date: 2004-09-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

What CN1082510A and USP5,240,892 adopted is that silica-alumina gel is made raw material, and silica-alumina gel is then prepared with water glass as raw material, and process is more complicated
The silicon source adopted in CN1194942A and CN1235875A is solid silica gel, and its price is comparatively expensive
The slag has been treated as waste for a long time because it has not been able to find a suitable use, which not only causes a waste of resources, but also causes environmental pollution

Method used

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  • Synthetic method for ZSM-5 zeolite

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preparation example Construction

[0014] Standard sample preparation

[0015] Dissolve 0.56 g of NaOH (chemically pure, test reagent, the same below) in 28 g of deionized water, add 1.34 g of Al under stirring 2 (SO 4 ) 3 18H 2 0 and 1.46 grams of n-butylamine (chemically pure, commercially available, the same below), then add 12 grams of 40-120 purpose silica gel (Qingdao Ocean Chemical Factory product), the reaction mixture molar ratio obtained is: SiO 2 / Al 2 o 3 =100,H 2 O / SiO 2 =7.8, Na 2 O / SiO 2 =0.05, n-butylamine / SiO 2 = 0.1. The mixture was placed in a sealed stainless steel reaction vessel, and crystallized at 170°C for 24 hours. After cooling, the product was filtered, washed and dried. The XRD analysis shows that the product SiO 2 / Al 2 o 3 =80, its crystal phase structure is ZSM-5 zeolite, see attached drawing. The crystallinity of this standard was defined as 100%.

Embodiment 1

[0017] This example illustrates the treatment of steel mill blast furnace slag used as raw material for zeolite synthesis.

[0018] Blast furnace slag (taken from Shougang) was beaten with 5 times of 60°C water for 10 minutes, filtered, rinsed with 5 times of room temperature water, and the filter cake was dried at 120°C for 5 hours to obtain ZSM-5 zeolite. raw material. Analysis showed that its SiO 2 The content is 94% by weight.

Embodiment 2

[0020] This example illustrates the process of synthesizing ZSM-5 zeolite using steel plant blast furnace slag as a silicon source.

[0021] Dissolve 0.56 g of NaOH in 28 g of deionized water and add 1.34 g of Al with stirring 2 (SO 4 ) 3 18H 2 0 and 1.46 gram n-butylamine, add the blast furnace slag that 11.5 gram embodiment 1 handles again, the reaction mixture molar ratio that obtains is: SiO 2 / Al 2 o 3 =100,H 2 O / SiO 2 =7.8, Na 2 O / SiO 2 =0.05, n-butylamine / SiO 2 = 0.1. The mixture was placed in a sealed stainless steel reaction vessel, and crystallized at 170°C for 24 hours. After cooling, the product was filtered, washed and dried. The XRD phase diagram of the gained zeolite sample is the same as the accompanying drawing, and its relative crystallinity is 84%, and the sample SiO 2 / Al 2 o 3 =80.

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Abstract

A process for synthesizing ZSM-5 zeolite includes such steps as proportionally mixing Si source, Al source, alkali, organic template agent and water, and hydrothermal crystallizing. Said Si source is the blast furnace's slag whose main component is SiO2, so decreasing its cost.

Description

technical field [0001] The present invention relates to a method for synthesizing ZSM-5 zeolite, more specifically, relates to a method for synthesizing ZSM-5 zeolite by using the blast furnace slag whose main component is silicon dioxide produced in the ironmaking process of iron and steel plant as raw material . Background technique [0002] Since ZSM-5 zeolite was synthesized by MOBIL company in 1972, it has been widely used in many fields of petrochemical industry, and its preparation technology has also become the focus of research. What the silicon source that is used for synthesizing this zeolite early prior art adopts water glass or silica sol, as the silicon source that adopts in CN1072654A is water glass or silica sol; The silicon source that adopts in USP4,061,724 is silica sol etc. In the conventional hydrothermal synthesis method using water glass or silica sol as a silicon source, the original feed water silicon is relatively large, and the single-pot yield is...

Claims

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Application Information

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IPC IPC(8): B01J29/40C01B39/38
Inventor 王殿中宗保宁罗一斌舒兴田何鸣元
Owner CHINA PETROLEUM & CHEM CORP
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