GB2004469A - Sulphuric acid concentration - Google Patents

Sulphuric acid concentration

Info

Publication number
GB2004469A
GB2004469A GB7837625A GB7837625A GB2004469A GB 2004469 A GB2004469 A GB 2004469A GB 7837625 A GB7837625 A GB 7837625A GB 7837625 A GB7837625 A GB 7837625A GB 2004469 A GB2004469 A GB 2004469A
Authority
GB
United Kingdom
Prior art keywords
calcium
scale
acid
sulphuric acid
concentrated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB7837625A
Other versions
GB2004469B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sulzer Escher Wyss AG
Montedison SpA
Original Assignee
Escher Wyss AG
Montedison SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Escher Wyss AG, Montedison SpA filed Critical Escher Wyss AG
Publication of GB2004469A publication Critical patent/GB2004469A/en
Application granted granted Critical
Publication of GB2004469B publication Critical patent/GB2004469B/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/69—Sulfur trioxide; Sulfuric acid
    • C01B17/88—Concentration of sulfuric acid

Abstract

An aqueous sulphuric acid containing calcium and possibly iron, titanium and/or other impurities is concentrated by evaporation in the presence of generally some 2-5% by weight of a microcrystalline material serving to hinder the deposition of calcium-containing scale. Particularly suitable is the monohydrate of ferrous sulphate precipitated from the acid (when the latter contains iron impurity) at concentrations higher than that at which calcium scale is normally encountered. The process can be operated by adding this precipitate as retrieved from the filter of a subsequent evaporation stage, or by contriving its formation in situ by taking the evaporation stage in which the calcium precipitates to a much higher concentration, say at least 38% by weight. Acid from the production of titanium dioxide by way of the sulphate can readily be concentrated in this way without scale deposition.
GB7837625A 1977-09-21 1978-09-21 Sulphuric acid concentration Expired GB2004469B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2779777A IT1086096B (en) 1977-09-21 1977-09-21 PROCEDURE FOR THE CONCENTRATION OF AQUEOUS SOLUTIONS OF SULFURIC ACID

Publications (2)

Publication Number Publication Date
GB2004469A true GB2004469A (en) 1979-04-04
GB2004469B GB2004469B (en) 1982-07-14

Family

ID=11222349

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7837625A Expired GB2004469B (en) 1977-09-21 1978-09-21 Sulphuric acid concentration

Country Status (8)

Country Link
JP (1) JPS5461094A (en)
CH (1) CH638465A5 (en)
DE (1) DE2807380A1 (en)
FR (1) FR2403973A1 (en)
GB (1) GB2004469B (en)
IT (1) IT1086096B (en)
NL (1) NL7809474A (en)
RO (1) RO76235A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5068093A (en) * 1987-11-23 1991-11-26 Sulzer-Escher Wyss Ag Method for producing titanium dioxide
WO2008003297A2 (en) * 2006-07-03 2008-01-10 Lailach Guenter Method and system for concentrating metal sulfate-containing sulfuric acid

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4403841C2 (en) * 1994-02-08 1997-12-04 Bayer Ag Process for evaporating used sulfuric acid
DE4403840C2 (en) * 1994-02-08 1997-12-04 Bayer Ag Process for the recovery of sulfuric acid from used sulfates containing metal sulfate
AU709404B2 (en) * 1995-07-24 1999-08-26 Kerr-Mcgee Pigments Gmbh & Co. Kg Process for the recovery of sulphuric acid from spent acids containing metal sulphates
JP4737670B2 (en) * 2005-03-30 2011-08-03 株式会社ササクラ Method and apparatus for treating wastewater containing calcium and sulfuric acid
CN110104617A (en) * 2019-04-24 2019-08-09 成都先进金属材料产业技术研究院有限公司 Utilize the method for alum concentration titanium white waste acid

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2078088A (en) * 1935-11-22 1937-04-20 Mantius Process of recovering sulphuric acid from sulphuric acid solutions of sulphates
FR1076258A (en) * 1952-03-25 1954-10-25 C D Patents Ltd Process for the recovery of sulfuric acid and inorganic sulphates from dilute waste liquors
DE957473C (en) * 1953-06-02 1957-02-07 Bayer Ag Process for the crystallization of substances, which can crystallize with different amounts of water of crystallization, in a form which is free of water of crystallization or has a low concentration of water of crystallization
DE1131193B (en) * 1960-10-14 1962-06-14 Bayer Ag Process for concentrating and desalting dilute, salty sulfuric acid
JPS5314429B2 (en) * 1973-05-11 1978-05-17
FR2328658A1 (en) * 1975-10-20 1977-05-20 Pechiney Aluminium IMPROVEMENTS IN THE PURIFICATION OF DILUTED SULFURIC SOLUTIONS

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5068093A (en) * 1987-11-23 1991-11-26 Sulzer-Escher Wyss Ag Method for producing titanium dioxide
WO2008003297A2 (en) * 2006-07-03 2008-01-10 Lailach Guenter Method and system for concentrating metal sulfate-containing sulfuric acid
WO2008003297A3 (en) * 2006-07-03 2008-04-03 Guenter Lailach Method and system for concentrating metal sulfate-containing sulfuric acid

Also Published As

Publication number Publication date
RO76235A (en) 1981-04-30
JPS6335320B2 (en) 1988-07-14
DE2807380C2 (en) 1990-08-09
FR2403973B1 (en) 1983-01-28
DE2807380A1 (en) 1979-03-29
IT1086096B (en) 1985-05-28
JPS5461094A (en) 1979-05-17
CH638465A5 (en) 1983-09-30
GB2004469B (en) 1982-07-14
FR2403973A1 (en) 1979-04-20
NL7809474A (en) 1979-03-23

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19920921