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  4. Sulfur-free mineral acids
 
patent

Sulfur-free mineral acids

Renken, Albert  
•
Heck, Guenter
•
Malow, Egon
Show more
1977

SO2 is removed from mineral acids, e.g., HCl, in an exchange column consisting of an absorption section with 5-10 plates, a cooling section, and a stripping section with 10-15 plates at the bottom. The choice of stripping gas is detd. by the subsequent treatment of the SO2. Thus, when a 50:50 gaseous mixt. of HCl and SO2 is fed into the absorption section (70-85 Deg) at 120 L/h with air (stripping gas) fed at 40 L/h into the stripping section (15 Deg) and water at a rate to give a 30 or 20% concn. of HCl, the purified acid contains SO2 <2 and SO42- <1 ppm for both concns. The waste gas contains <1 ppm HCl. [on SciFinder (R)]

  • Details
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Type
patent
EPO Family ID

5957058

Author(s)
Renken, Albert  
•
Heck, Guenter
•
Malow, Egon
•
Henke, Karl Heinz
Subjects

sulfur dioxide removal mineral acid

•

hydrochloric acid sulfur dioxide removal

Note

CAN 87:41299

49-2

Industrial Inorganic Chemicals

Patent

written in German.

19770331

7446-09-5 Role: REM (Removal or disposal), PROC (Process) (removal of, from hydrochloric acid, app. for); 7647-01-0P Role: PREP (Preparation) (sulfur dioxide removal from, app. for)

Alternative title(s) : (ol) Processo per la produzione di acid minerale privo di zolfo

EPFL units
LGRC  
DOICountry codeKind codeDate issued

DE2542127

DE

C2

1987-10-15

IT1068527

IT

B

1985-03-21

FR2324571

FR

B1

1980-03-21

GB1544517

GB

A

1979-04-19

FR2324571

FR

A1

1977-04-15

DE2542127

DE

A1

1977-03-31

BE846430

BE

A

1977-03-22

Available on Infoscience
April 18, 2006
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/229321
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