GB1291903A - Improvements in or relating to a recovery process - Google Patents

Improvements in or relating to a recovery process

Info

Publication number
GB1291903A
GB1291903A GB3767970A GB3767970A GB1291903A GB 1291903 A GB1291903 A GB 1291903A GB 3767970 A GB3767970 A GB 3767970A GB 3767970 A GB3767970 A GB 3767970A GB 1291903 A GB1291903 A GB 1291903A
Authority
GB
United Kingdom
Prior art keywords
sodium
furnace
inorganic material
flue
aug
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
GB3767970A
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of GB1291903A publication Critical patent/GB1291903A/en
Expired legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/06—Treatment of pulp gases; Recovery of the heat content of the gases; Treatment of gases arising from various sources in pulp and paper mills; Regeneration of gaseous SO2, e.g. arising from liquors containing sulfur compounds
    • D21C11/063—Treatment of gas streams comprising solid matter, e.g. the ashes resulting from the combustion of black liquor
    • D21C11/066—Separation of solid compounds from these gases; further treatment of recovered products
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/24—Halogens or compounds thereof
    • C25B1/26—Chlorine; Compounds thereof

Abstract

1291903 Treating black liquor MITSUBISHI JUKOGYO KK 4 Aug 1970 [7 Aug 1969 13 Aug 1969] 37679/70 Heading D2W In a recovery process for cooking agents used to digest wood pulp, e.g. in Kraft paper manufacture, inorganic material is collected in the flue of a recovery furnace, sodium chloride is removed from the inorganic material and the inorganic material is then returned to the furnace. In the recovery process, the black liquor from the digester is concentrated in a cascade evaporator, sodium sulphate is added and the liquor is heated in a furnace to burn off organic material. The molten residue undergoes further treatment, and it is stated that the greatest concentration of sodium chloride impurity is found in inorganic material carried up the flue of the furnace. The material in the form of dust is extracted from the flue by an electrostatic precipitator, and is dissolved in water and electrolysed, using an insoluble anode such as spiral platinum wire, or platinum-coated titanium or lead dioxide. The cathode may be an iron network, and the electrolyte acidified by sulphuric acid. The liquor also includes sodium sulphide, sodium carbonate, sodium sulphate, sodium sulphite and sodium thiosulphite. The electrolyte may be neutralized by mixing with it material from the economizer of the cascade evaporator, which is alkaline. The electrolyte may be electrolyzed batchwise or continuously.
GB3767970A 1969-08-07 1970-08-04 Improvements in or relating to a recovery process Expired GB1291903A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6247469 1969-08-07
JP6400569 1969-08-13

Publications (1)

Publication Number Publication Date
GB1291903A true GB1291903A (en) 1972-10-04

Family

ID=26403511

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3767970A Expired GB1291903A (en) 1969-08-07 1970-08-04 Improvements in or relating to a recovery process

Country Status (3)

Country Link
FI (1) FI53727C (en)
GB (1) GB1291903A (en)
SE (1) SE363518B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019073144A1 (en) * 2017-10-12 2019-04-18 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method for treating the ash from electrostatic filters of the recovery boiler in a kraft process

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019073144A1 (en) * 2017-10-12 2019-04-18 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method for treating the ash from electrostatic filters of the recovery boiler in a kraft process
FR3072396A1 (en) * 2017-10-12 2019-04-19 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude METHOD FOR TREATING ELECTROFILTER ASHES FROM THE RECOVERY BOILER IN A KRAFT PROCESS

Also Published As

Publication number Publication date
FI53727B (en) 1978-03-31
SE363518B (en) 1974-01-21
FI53727C (en) 1978-07-10

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee