Google Answers Logo
View Question
 
Q: chemistry ( Answered,   0 Comments )
Question  
Subject: chemistry
Category: Science > Chemistry
Asked by: adelaziz-ga
List Price: $10.00
Posted: 19 Jun 2005 22:02 PDT
Expires: 19 Jul 2005 22:02 PDT
Question ID: 534993
how can i use thermal decomposition to prepare so3 from "caso4 gypsum "?
Answer  
Subject: Re: chemistry
Answered By: till-ga on 20 Jun 2005 02:01 PDT
 
You will have to use rather high temperatures (sources state 700C -
1100C) to decompose CaSO4 gypsum.

"Thermal decomposition of gypsum into CaSO4 and H2O above approx: 140C (413 K)
into CaO and SO3 above approx: 700C (1273 K)"

from:
Transmix
( http://www.transmix.co.uk/safety.htm )

Other sources state even higher temperatures required:
"thermische Zersetzung ab ca. 1000C in Calciumoxid und Schwefeltrioxid."
thermal decomposition above appr. 1000 C into CaO and SO3
( http://www.chdb.de/anorganik/chemikalien/chemikalie_anorg_7778-18-9.htm )
(Translation by me)
Same temperture range (above 1000 C) is given in
( http://ceramic-materials.com/cermat/material/834.html )

I hope this helps to solve your question.

till-ga

Search strategy:
( ://www.google.de/search?sourceid=navclient&hl=de&ie=UTF-8&rls=DVXA,DVXA:2005-05,DVXA:de&q=thermal+decomposition+casO4+so3
)
Comments  
There are no comments at this time.

Important Disclaimer: Answers and comments provided on Google Answers are general information, and are not intended to substitute for informed professional medical, psychiatric, psychological, tax, legal, investment, accounting, or other professional advice. Google does not endorse, and expressly disclaims liability for any product, manufacturer, distributor, service or service provider mentioned or any opinion expressed in answers or comments. Please read carefully the Google Answers Terms of Service.

If you feel that you have found inappropriate content, please let us know by emailing us at answers-support@google.com with the question ID listed above. Thank you.
Search Google Answers for
Google Answers  


Google Home - Answers FAQ - Terms of Service - Privacy Policy