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Filtering separation method for nanometer molecular sieve slurry

A nano-molecular sieve, filtration and separation technology, applied in filtration and separation, separation methods, molecular sieve catalysts, etc., can solve the problems affecting the quality and properties of molecular sieves, and achieve the effects of promoting flocculation, cheap and easy-to-obtain raw materials, and improving solid phase purity.

Active Publication Date: 2014-04-30
大连龙缘化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is easy to introduce other heteroatoms in the separation and filtration, which affects the quality and properties of molecular sieves.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In a 5-liter stainless steel autoclave, put 2 kg of 23% silica sol, 0.1 kg of dimethylamine, and 0.05 kg of aluminum sulfate, and adjust the pH to 11-12 with aqueous sodium hydroxide solution. Raise the temperature, react at 150°C for 20 hours, cool down to a temperature of 80°C, the total amount of slurry is about 3.5 liters, of which the theoretical amount of nano ZSM-5 is 440±10 grams.

[0035]Add 600 ml of pure water into a 10-liter beaker, pour all the slurry in the stainless steel autoclave into the beaker under stirring, then add 30 grams of 98% concentrated sulfuric acid into the beaker, stir for half an hour, then add 20% sulfuric acid gradually Adjust the pH of the slurry to 8.5 (check the pH value of the slurry with precision test paper); add the above-mentioned material with a pH of 8.5 into the autoclave, close the autoclave, pressurize the pressure to 0.4 MPa with compressed air, and pressurize the slurry to Filter in a 1.5-square-meter plate-and-frame fil...

Embodiment 2

[0037] Add 4000 ml of pure water at 60°C to a 10-liter flask, add 450 grams of nano-beta molecular sieve powder under constant stirring, beat, then add 20 grams of citric acid to the beaker, keep the temperature of the slurry at 50°C, and add 20% citric acid The solution gradually adjusts the pH value of the slurry to 5 (use precision test paper to detect the pH value of the slurry), and after stirring for half an hour, add the above-mentioned material with a pH of 5 into the autoclave; close the autoclave, and pressurize the slurry to 1.5 with compressed air The square meter plate and frame filter is used for filtration. After all the slurry is hydraulically injected into the filter, the filter cake is continuously purged with compressed air until the filter drain valve no longer flows. Unloading, at this time, the nano-β molecular sieve has formed a dry filter cake with a thickness of about 2 mm. After opening the filter press, brush off the solid material attached to the pla...

Embodiment 3

[0039] Put 2 kg of 23% silica sol into a 5-liter autoclave, and adjust the pH to 11-12 with tetrabutylamine hydroxide aqueous solution. Add 0.07 kg of ethyl titanate, heat up to 160°C, react for 48 hours, cool down to 50°C, the total amount of slurry is about 3.5 liters, of which the theoretical amount of nano-titanium silicon molecular sieve is 440±10 grams; then use compressed air to crystallize All the slurry in the kettle is hydraulically injected into a filter press of 1.5 square meters, and then the filter cake is continuously purged with compressed air until the filter drain valve no longer flows. Unloading, at this time, the nano-titanium silicon molecular sieve has formed a dry filter cake with a thickness of about 2mm. After opening the filter press, brush off the solid material attached to the plate frame with a brush to obtain a total of 740 grams of wet material (including the filter cake. and solid material brushed off the frame). Add the obtained filter cake an...

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PUM

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Abstract

The invention relates to a filtering separation method for nanometer molecular sieve slurry, and belongs to the field of nanometer molecular sieve materials. The filtering separation method for the nanometer molecular sieve slurry is as follows: the pH value of the nanometer molecular sieve slurry is adjusted to be less than or equal to 5 by utilizing an acid material, and pressure filtering is carried out for at least one time. The nanometer molecular sieve filtered by the method provided by the invention has the equivalent catalytic reaction performance to that of the nanometer molecular sieve obtained by the common filtering process. The method has the advantages that the operation is simple; the used raw materials are low in price, and easy to obatin; the special equipment is not needed; the nanometer molecular sieve particles can be completely recovered by a common filtering machine; the method is suitable for the scaled production of the nanometer molecular sieve.

Description

technical field [0001] The invention relates to a method for filtering and separating nano molecular sieve slurry, which belongs to the field of nano molecular sieve materials. Background technique [0002] Due to their large specific surface area and high intracrystalline diffusion rate, nano-molecular sieves exhibit superior performance in improving catalyst utilization, enhancing macromolecular conversion capabilities, reducing deep reactions, increasing selectivity, and reducing coking deactivation. Thus making the nano molecular sieve a new material with unique catalytic properties. Especially with the advancement of science and technology in oil refining, chemical industry and other industries, the production and application of nano molecular sieves are becoming more and more extensive. At present, a major problem faced in the production of ultrafine molecular sieves is how to separate liquid and solid with high efficiency without affecting the performance of the prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D37/00B01J29/00
Inventor 王刃郑学胜孙业飞吴昊孙文龙王立新
Owner 大连龙缘化学有限公司
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