EP 0655986 A1 19950607 - PROCESS AND APPARATUS FOR NEUTRALISATION OF ACID STREAMS.
Title (en)
PROCESS AND APPARATUS FOR NEUTRALISATION OF ACID STREAMS.
Title (de)
VERFAHREN UND VORRICHTUNG ZUR NEUTRALISATION VON SÄUREHALTIGEN STRÖMEN.
Title (fr)
PROCEDE ET APPAREIL DE NEUTRALISATION D'ECOULEMENT D'ACIDE.
Publication
Application
Priority
- GB 9301762 W 19930819
- GB 9217962 A 19920824
Abstract (en)
[origin: WO9404467A1] A process for the neutralisation of an acid stream by (a) feeding the acid stream and calcium hydroxide through a first reaction zone, preferably a plug flow reactor (1) to a second reaction zone, preferably a stirred tank reactor (12) so that the calcium hydroxide partially neutralises the acid stream during feed of the stream to the second reaction zone, the second reaction zone being provided with means for measuring the pH of the solution within the second reaction zone (14) and means for feeding aqueous base to the second reaction zone. The apparatus comprises a plug flow reactor (1) provided with means for feeding the acid stream (4) and calcium hydroxide stream (8) thereto under ratio feed-forward control (7), and a stirred tank reactor (12) provided with means for measuring the pH of the solution therein (14), an aqueous base feed (15) and feedback control means (17) for controlling the addition of aqueous base thereto.
IPC 1-7
IPC 8 full level
A62D 3/36 (2007.01); C02F 1/66 (2006.01); A62D 101/40 (2007.01)
CPC (source: EP)
A62D 3/36 (2013.01); C02F 1/66 (2013.01); A62D 2101/40 (2013.01)
Citation (search report)
See references of WO 9404467A1
Designated contracting state (EPC)
BE DE ES FR GB IE IT LU NL PT
DOCDB simple family (publication)
WO 9404467 A1 19940303; CA 2139441 A1 19940303; EP 0655986 A1 19950607; GB 9217962 D0 19921007; JP H08500523 A 19960123
DOCDB simple family (application)
GB 9301762 W 19930819; CA 2139441 A 19930819; EP 93918055 A 19930819; GB 9217962 A 19920824; JP 50605394 A 19930819