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Forum index » Science and Technology » Chem » Analytical
Titanium dioxide solvent
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crilenka@gmail.com
science forum beginner


Joined: 06 Jan 2006
Posts: 1

PostPosted: Fri Jan 06, 2006 10:56 pm    Post subject: Re: Titanium dioxide solvent Reply with quote

you may try to wash pipette at first 1M H2SO4, and then with distilled
water. Becouse most of titanium compounds easily hydrolised under pH>2.
HF is a good solvent for TiO2, bat if you use glass pipette it not
valid solvent.
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pakaque
science forum beginner


Joined: 27 Apr 2005
Posts: 9

PostPosted: Sat Dec 17, 2005 3:05 am    Post subject: Re: Titanium dioxide solvent Reply with quote

Thanks..
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Gregg
science forum beginner


Joined: 12 Jun 2005
Posts: 33

PostPosted: Fri Dec 16, 2005 10:40 pm    Post subject: Re: Titanium dioxide solvent Reply with quote

rentabau wrote:
Quote:
dear gregg,

thanks for your reply. i would try your solution. but how hot should i
heat the conc. sulfuric acid? what's the temperature? thank you in
advance

just boil the acid over a hot plate - under a hood - using a flask and

reflux column. It may take a couple hours.
dilute the sulfuric or add caustic and Ti(OH)4 will ppt out.

Our Chemist was out today - So I couldn't get the exact procedure from her.
Form more information on TiO2 manufacturing try:
http://www.huntsman.com/pigments/Media/Manufacture_and_Generals_Properties.pdf

Huntsman has a good site for general TiO2 information.

Gregg
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pakaque
science forum beginner


Joined: 27 Apr 2005
Posts: 9

PostPosted: Thu Dec 15, 2005 5:57 am    Post subject: Re: Titanium dioxide solvent Reply with quote

dear gregg,

thanks for your reply. i would try your solution. but how hot should i
heat the conc. sulfuric acid? what's the temperature? thank you in
advance
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pakaque
science forum beginner


Joined: 27 Apr 2005
Posts: 9

PostPosted: Thu Dec 15, 2005 5:54 am    Post subject: Re: Titanium dioxide solvent Reply with quote

Dear krishna,
thanks for your solution. would you mind explaining what is 'Nitration
Mixture'. can you give me an example.thanks in advance
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Gregg
science forum beginner


Joined: 12 Jun 2005
Posts: 33

PostPosted: Wed Dec 14, 2005 10:27 pm    Post subject: Re: Titanium dioxide solvent Reply with quote

rentabau wrote:
Quote:
Dear all,

I'm doing experiment dealing with titanium isopropoxide. whenever, i
pipetted an amount of titanium isopropoxide there's always a white
precipitate left inside the pipette. is the white precipitate titanium
dioxide? this white precipitate is making me annoyed as it is very hard
to remove. how can i dissolve this precipitate? Thank you for any help
given. Really appreciate it

Try Hot Conc. sulfuric - That's how they dissolve Ilmenite ore before

precipitating Ti(OH)4 to make TiO2 pigments (sulfate process)

Gregg
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rmk.krishna@gmail.com
science forum beginner


Joined: 14 Dec 2005
Posts: 2

PostPosted: Wed Dec 14, 2005 1:56 pm    Post subject: Re: Titanium dioxide solvent Reply with quote

I think using the disposable apparatus is not the solution as these
days people are working on cost effective methods.
Coming to the point of using HF as cleaning agent is also a wrong
prescription as it is well known to all the chemists that HF eats away
all the glass so this is also not advised.
I think Nitration Mixture may work effectively even in the case of
Cost.

Do Mail me if it works.
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rmk.krishna@gmail.com
science forum beginner


Joined: 14 Dec 2005
Posts: 2

PostPosted: Wed Dec 14, 2005 1:54 pm    Post subject: Re: Titanium dioxide solvent Reply with quote

I think using the disposable apparatus is not the solution as these
days people are working on cost effective methods.
Coming to the point of using HF as cleaning agent is also a wrong
prescription as it is well known to all the chemists that HF eats away
all the glass so this is also not advised.
I think Nitration Mixture may work effectively even in the case of
Cost.

Do Mail me if it works.
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pakaque
science forum beginner


Joined: 27 Apr 2005
Posts: 9

PostPosted: Tue Dec 13, 2005 2:37 pm    Post subject: Re: Titanium dioxide solvent Reply with quote

Thanks for your help. really appreciate it Smile
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rekuci@gmail.com
science forum addict


Joined: 22 Sep 2005
Posts: 98

PostPosted: Tue Dec 13, 2005 11:55 am    Post subject: Re: Titanium dioxide solvent Reply with quote

Titanium isopropoxide is rather easily hydrolyzed to titanium dioxide.
Avoid contamination of the isopropoxide solution with water, including
moisture in the air, which is probably the source of your problem.

To dissolve precipitated TiO2, try concentrated HClO4 and HCl. If that
doesn't work, add HF to the party. Fume at your own risk. Honestly,
you're probably better off treating your glass pipettes as disposable.
If you have the facility, work in a humidity controlled atmosphere.
Try rinsing your pipettes thoroughly immediately after use.
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pakaque
science forum beginner


Joined: 27 Apr 2005
Posts: 9

PostPosted: Tue Dec 13, 2005 3:15 am    Post subject: Titanium dioxide solvent Reply with quote

Dear all,

I'm doing experiment dealing with titanium isopropoxide. whenever, i
pipetted an amount of titanium isopropoxide there's always a white
precipitate left inside the pipette. is the white precipitate titanium
dioxide? this white precipitate is making me annoyed as it is very hard
to remove. how can i dissolve this precipitate? Thank you for any help
given. Really appreciate it
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