Testing and Manufacturing Molecular Sieves

Try our site for starters and then get hold of books on zeolites; at our site the post is at: www.gbanalysts.com/Reading20%Room/Situation20%Analysis/BiodieselTechs/washingpellets.html

This is merely a guide towards developing a manufacturing technology. Good luck

That URL doesn't work. Please try again.

Sorry, I had inadvertently added the HTML codes "20%", here try this:

www.gbanalysts.com/Reading Room/Situation Analysis/BiodieselTechs/washingpellets.html

Should you still have any problem then do this: go to the website www.gbanalysts.com click "Reading Room" menu and then the "Situation Analysis" menu and then select the "Technology Analysis" dropdown menu, you should find it entitled Developing Waterfree Washing [Biodiesel] Pellets.

Thanks...

will you please help me in getting more information regarding the subject.

Try Grace-Davidson in USA

http://www.grace.com/Search.aspx?s=ALLGRACE&q=molecular+sieves

Mitul,

I am not quite sure about the actual nature of the information you want, so I am answering as best I understand it: Information about aluminosilicates are in the literature on zeolites, clay and variety of other substances, and these are naturally occurring minerals in the form of Talc. However, if you are asking for information about manufacturing the minerals, then I am afraid you have to develop one on your own, because such information are proprietary and often classified under Trade Secrets.

Yet I will try to help you along some. First aluminosilicate as the name implies is a compound formed from alunimium and silica by some chemical reaction. The specifics of the reaction depends on the company that is manufacturing the mineral All the same here is guide: Because we know that the mineral is a compound of aluminium and silica, it is reasonable to assume that the process can be started with silica available as sand and gravel stones. So lets have the sand ground into fine powder and then dissolved in a chemical liquid that is a solvent for silica. Next into that solution we will introduce aluminium powder and [if needed then possibly a catalyst and] the task is done. Now we know that the minerals are in fact crystalline, so we should expect some kind of a gel forming as a result of the reaction, which means the gels have to be collected before the gel fully sets in the entire vessel; the dried gel will then be ground into powder of the size preferred.

I hope that this helps.

thanks for all,

manufacturing part understood,

Can please help me in testing of molecular sieve.

we are using it for refinery application in LPG gas dryer to adsorb water molecules from final gas outlet stream.

We are using grade 3A molecular sieve.

did you checke the ASTM homepage? Alternatively, a standard test method is described in ISO 15901-2. There you will find information on Standard UOP874 - 88 "Pore Size Distribution of Porous Substnces by Nitrogen Adsoprtion Using a Quantachrome Analyzer"

Alternatively you should also take a look at ISO 15901-2

Please refer to: http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=39386

nudnik

"So lets have the sand ground into fine powder and then dissolved in a chemical liquid that is a solvent for silica"

Hi,

fine powder: good idea, dissolve in liquid: not a good idea unless you can dissolve in very hot and pressurised water (as in synthetic quartz crystal growing).

There are existing a lot of natural zeolites (near 20?) but Talc is not a zeolite.

Talc has a three-layered crystalline structure, is one of the clay-minerals. Chemical formula is Mg₃.(OH)₂.(Si₄O₁₀), also known as steatite.

Zeolites have natural voids in their crystal-structure that act as absorbing centers.

These voids have dimensions of some nanometer to some 10nanometer.

Synthetic zeolites are produced as very fine crystalline precipitates from solutions of silicic acid and the other multiple reaction partners.

RHABE

However, as the original request stated, molecular sieve and such are defined: Often they consist of aluminosilicate minerals, clays, porous glasses, microporous charcoals, zeolites, active carbons, or synthetic compounds that have open structures through which small molecules, such as nitrogen and water can diffuse. with ref at:http://en.wikipedia.org/wiki/Molecular_sieve; I was simply guiding him with respect to a general family of molecular sieves.

Then as you have noted also: "Talc has a three-layered crystalline structure, is one of the clay-minerals" which is consistent with the definition of clays also underlined-above as a molecular sieve.

The object was to produce aluminosilicate molecular sieves, and not necessarily zeolites.

Also I am curious does hot pressured water still qualify as a "chemical liquid"?

BTW the dissolution of silica in a "chemical liquid" is a Soviet technology that is not under proprietary control and so I was guiding Mitul to it given that there would be no issue of Trade Secrets even if the process developed accidently converges accidentally on some other company's process.

Thank you, anyway.

Hi,

do you know more about this "chemical liquid"? I never did read anything about it.

Patented? Sold somewhere? Published?

In my knowledge there are molecular sieves related to zeolites and not to other may be absorbing substances - maybe I am wrong.

And all the zeolites I have found in a mineralogical book are alumosilicates. But not all alumosilicates are zeolithes.

RHABE

If you are looking for tests standards please refer to the astm homepage (www.astm.org) and use the search function. I remember a test method base on mercury adsorption but this may be a "historic procedure" which has been replaced by other tests.

Wit respect to manufacturing methods: Which type of molecular sieve do you want to manufacture and which specific properties should the sieve material have? If you are looking for hydrophobic molecular sieve you should "google" for carbon molecular sieves which are made by controlled pyrolysis of organic material or plasitc material.

nudnik