Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method for small-grain A-type molecular sieve primary powder

A technology of molecular sieve and small crystal grains, which is applied in the direction of A-type crystalline aluminosilicate zeolite and crystalline aluminosilicate zeolite to achieve the effects of easy control, low cost and avoiding environmental pollution

Active Publication Date: 2015-05-06
LUOYANG JALON MICRO NANO NEW MATERIALS CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Molecular sieve dewaxing mainly relies on molecular sieves to adsorb n-alkanes, so synthesizing molecular sieves with high crystallinity and reducing internal skeleton defects is the main way to improve the adsorption capacity of molecular sieves; after the adsorption is completed, molecular sieves are purged with heated steam or other gases to remove adsorption Reducing the molecular sieve particles can increase the desorption rate and prevent organic alkanes from being removed slowly and causing carbon deposition or coking in the pores of the molecular sieve, which will cause trouble or failure in the post-processing of the molecular sieve product.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method for small-grain A-type molecular sieve primary powder
  • Preparation method for small-grain A-type molecular sieve primary powder

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] A method for preparing the former powder of small-grain A-type molecular sieve, specifically comprising the following steps:

[0031] 1), preparation of directing agent

[0032] molar ratio SiO 2 / A1 2 o 3 =15~20,Na 2 O / A1 2 o 3 =15~20,H 2 O / Na 2 The ratio of O=10~30 is fed, and a certain amount of silicon source, aluminum source, alkali source and water are respectively weighed, and the alkali source and aluminum source are added to the water to obtain high-basic sodium aluminate, and then the silicon source is quickly (2 Feed within ~3min) into high alkalinity sodium aluminate, after stirring at room temperature, aging at 2~10°C for 1~7d, the desired directing agent can be obtained;

[0033] 2) Synthesize small-grain A-type molecular sieve raw powder

[0034] a. Prepare materials

[0035] Mole ratio is Na 2 O: A1 2 o 3 : SiO 2 :H 2 O=2~3.5: 1:2~3:80~150 Ratio feeding, weigh a certain amount of silicon source, aluminum source, alkali source and water as ...

Embodiment 1

[0049] A method for preparing the former powder of small-grain A-type molecular sieve, specifically comprising the following steps:

[0050] 1), preparation of directing agent

[0051] Add 185ml of sodium hydroxide solution (Na 2 O content is 345g / L), 80ml sodium metaaluminate solution (Na 2 O content is 155g / L, Al 2 o 3 content is 130g / L), to obtain high alkalinity sodium aluminate, and then 280ml sodium hydroxide solution (Na2 O content is 110g / L, SiO 2 The content is 335g / L) quickly added to the high alkalinity sodium aluminate solution, and 65ml of water was added, stirred at room temperature for 45min, and aged at 5°C for 40h, then it became the guiding agent.

[0052] 2) Synthesize small-grain A-type molecular sieve raw powder

[0053] Add 213ml of water, 120ml of sodium hydroxide (Na 2 O content is 110g / L, SiO 2 content is 335g / L), 132ml sodium hydroxide solution (Na 2 O content is 44g / L), 285ml sodium metaaluminate solution (Na 2 O content is 145g / L, Al 2 o ...

Embodiment 2

[0055] A method for preparing the former powder of small-grain A-type molecular sieve, specifically comprising the following steps:

[0056] 1), preparation of directing agent

[0057] Add 160ml of sodium hydroxide solution (Na 2 O content is 345g / L), 60ml sodium metaaluminate solution (Na 2 O content is 155g / L, Al 2 o 3 content is 130g / L), to obtain high alkalinity sodium aluminate, and then 270ml sodium hydroxide solution (Na 2 O content is 110g / L, SiO 2 content is 335g / L) quickly added to the high alkalinity sodium aluminate solution, and 180ml of water was added, stirred at room temperature for 45min, left to age at 10°C for 2d, then it was used as a guiding agent.

[0058] 2) Synthesize small-grain A-type molecular sieve raw powder

[0059] Add 145ml of water, 115ml of sodium hydroxide (Na 2 O content is 110g / L, SiO 2 content is 335g / L), 30ml sodium hydroxide solution (Na 2 O content is 125g / L), 281ml sodium metaaluminate solution (Na 2 O content is 145g / L, Al ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
water absorptionaaaaaaaaaa
water absorptionaaaaaaaaaa
Login to View More

Abstract

A preparation method for a small-grain A-type molecular sieve primary powder comprises preparing a directing agent, stocking, gelating, aging, crystallizing, solid-liquid separating, washing and drying, when feeding, the mol ratio of SiO2 / Al2O3 is 1.7-2.1, the mol ratio of Na2O / Al2O3 is 2.3-4.2, and the mol ratio of H2O / Na2O is 20.0-40.0, the directing agent accounts for 0.01-0.1% by total volume of the raw materials, the gelating temperature is controlled at 15-40 DEG C, aging at 45-75 DEG C for 1-10 h, then standing and crystallizing at 85-100 DEG C for 1-10 h, separating the crystal, washing and drying, and then getting the product. The A-type molecular sieve primary powder has water-absorbing capacity of 26.5% or more, granularity of 500 nm-1000 nm in a uniform particle size distribution, is good in repeatability, and helps to realize cycle usage of the raw materials.

Description

technical field [0001] The invention relates to the technical field of molecular sieve preparation, in particular to a method for preparing a type A molecular sieve raw powder with particles smaller than 1 μm. Background technique [0002] Type A zeolite is the earliest synthesized artificial zeolite, which is often used for drying, adsorption separation, and ion modification. In recent years, it has been used in detergent additives to replace tripolyphosphate to meet the environmental protection requirements of no phosphating, with an annual output of more than one million tons. As a detergent builder, it is required to reduce the particle size of the product, and the exchange speed of small particles is faster. Calcium and magnesium ions in hard water can easily exchange with sodium ions to soften the water quality. As a commonly used adsorbent, type A molecular sieve has no higher adsorption capacity in nanoparticle molecular sieves. The main reasons are: 1. After reduc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/16
Inventor 刘利爽张帅
Owner LUOYANG JALON MICRO NANO NEW MATERIALS CO LTD