GB744465A - Improvements relating to the washing and cooling of gases containing sulphur dioxide - Google Patents

Improvements relating to the washing and cooling of gases containing sulphur dioxide

Info

Publication number
GB744465A
GB744465A GB9136/52A GB913652A GB744465A GB 744465 A GB744465 A GB 744465A GB 9136/52 A GB9136/52 A GB 9136/52A GB 913652 A GB913652 A GB 913652A GB 744465 A GB744465 A GB 744465A
Authority
GB
United Kingdom
Prior art keywords
cooling
cooled
stage
liquid
acid
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.)
Expired
Application number
GB9136/52A
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.)
Chemiebau Dr A Zieren GmbH and KG
Original Assignee
Chemiebau Dr A Zieren GmbH and KG
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 Chemiebau Dr A Zieren GmbH and KG filed Critical Chemiebau Dr A Zieren GmbH and KG
Publication of GB744465A publication Critical patent/GB744465A/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
    • C01B17/48—Sulfur dioxide; Sulfurous acid
    • C01B17/50—Preparation of sulfur dioxide
    • C01B17/56—Separation; Purification

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Treating Waste Gases (AREA)

Abstract

Roasting and combustion gases containing sulphur dioxide are washed and cooled in two or more stages by direct cooling with a liquid which is circulated in a separate cycle for each stage, the whole or a part of the cooling liquid from the first stage being subjected to a direct cooling operation by the evaporation of water therefrom and the cooling liquid in subsequent stages being cooled by cooling surfaces. Evaporation of water from the first stage cooling liquid may be effected exterior to the washing zone under vacuum or by passage therethrough of cold air in a tower or rotating tube, or by trickling the cooling liquid over acid-resistant material stacked in the open air. In each case the cooled liquid is passed through a settler to remove solid deposits, chiefly arsenic trioxide, before recirculation. The first stage cooling is effected at as high a temperature as possible to minimize sulphur dioxide losses. According to examples (1) gases containing 10 per cent by volume SO2 are cooled from 400 DEG to 78 DEG C. in a first stage cooling by means of 45 per cent sulphuric acid entering at 55 DEG C. A portion of the hot acid is then passed to vacuum vessel where by evaporation of water the temperature is lowered to 35 DEG C. The cooled acid passes to a settler where arsenic trioxide is removed and then to a mixing vessel where it is mixed with the remainder of the hot acid to adjust the temperature to 55 DEG C. and to form a mixture no longer saturated with arsenic trioxide, which is then recycled. The gas from the first stage is passed to a second stage where it is cooled to 30 DEG C. by spraying with a recirculated wash liquid from which the heat is removed by cooling surfaces. (2) In cooling a gas as in Example 1 from 400 DEG to 70 DEG C., the washing liquid entering at 60 DEG C., leaves at 90 DEG C. and part is cooled to 35 DEG C. by passing air at 20 DEG C. therethrough. Impurities are removed as before and the cooled liquid mixed with the remainder to re-form a mixture at 60 DEG C. which is recycled. The second stage cooling is as before. Specification 742,052 is referred to.
GB9136/52A 1951-04-23 1952-04-09 Improvements relating to the washing and cooling of gases containing sulphur dioxide Expired GB744465A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE744465X 1951-04-23

Publications (1)

Publication Number Publication Date
GB744465A true GB744465A (en) 1956-02-08

Family

ID=6648154

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9136/52A Expired GB744465A (en) 1951-04-23 1952-04-09 Improvements relating to the washing and cooling of gases containing sulphur dioxide

Country Status (1)

Country Link
GB (1) GB744465A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2347084A1 (en) * 1976-04-09 1977-11-04 Boliden Ab PROCESS FOR THE PURIFICATION, BY WET METHOD, OF GASES CONTAINING SULFUR DIOXIDE, HALOGENS AND ARSENIC
DE2905083A1 (en) * 1979-02-10 1980-08-28 Metallgesellschaft Ag METHOD FOR THE PRODUCTION OF SULFURIC ACID
EP0258744A2 (en) * 1986-09-02 1988-03-09 Bayer Ag Method for the purification and reheating of exhaust gases
EP0258743A2 (en) * 1986-09-02 1988-03-09 Bayer Ag Method for the purification of exhaust gases

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2347084A1 (en) * 1976-04-09 1977-11-04 Boliden Ab PROCESS FOR THE PURIFICATION, BY WET METHOD, OF GASES CONTAINING SULFUR DIOXIDE, HALOGENS AND ARSENIC
DE2905083A1 (en) * 1979-02-10 1980-08-28 Metallgesellschaft Ag METHOD FOR THE PRODUCTION OF SULFURIC ACID
EP0258744A2 (en) * 1986-09-02 1988-03-09 Bayer Ag Method for the purification and reheating of exhaust gases
EP0258743A2 (en) * 1986-09-02 1988-03-09 Bayer Ag Method for the purification of exhaust gases
EP0258743A3 (en) * 1986-09-02 1988-07-27 Bayer Ag Method for the purification of exhaust gases
EP0258744A3 (en) * 1986-09-02 1988-07-27 Bayer Ag Method for the purification and reheating of exhaust gases
US4931269A (en) * 1986-09-02 1990-06-05 Bayer Aktiengesellschaft Process for the purification and reheating of exhaust gases
US5122358A (en) * 1986-09-02 1992-06-16 Bayer Aktiengesellschaft Process for the purification of exhaust gases

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