EP 3591091 B1 20210721 - METHOD FOR ZERO-DISCHARGE PHOSPHATIZATION AND SAPONIFICATION BASED ON HIGH-PRESSURE CLOSED CIRCULATION SYSTEM
Title (en)
METHOD FOR ZERO-DISCHARGE PHOSPHATIZATION AND SAPONIFICATION BASED ON HIGH-PRESSURE CLOSED CIRCULATION SYSTEM
Title (de)
VERFAHREN ZUR ENTLADUNGSFREIEN PHOSPHATIERUNG UND VERSEIFUNG AUF DER BASIS EINES GESCHLOSSENEN HOCHDRUCK-KREISLAUFSYSTEMS
Title (fr)
PROCÉDÉ DE PHOSPHATATION ET DE SAPONIFICATION À DÉCHARGE NULLE BASÉ SUR UN SYSTÈME DE CIRCULATION FERMÉE HAUTE PRESSION
Publication
Application
Priority
CN 201810709238 A 20180702
Abstract (en)
[origin: EP3591091A1] The invention discloses a method for zero-discharge phosphatization and saponification based on a high-pressure closed circulation system, which comprises an autoclave, a separation kettle, a buffer kettle and a hydraulic pump. The method comprises the following steps: step 1: a workpiece is fed into the autoclave and then sealed such that the pressure range of the autoclave is above 20 MPa; step 2: degreasing and derusting by CO<sub>2</sub>; step 3: cyclic separation; step 4: high-pressure phosphatization; step 5: cyclic separation II; step 6: high-pressure saponification; step 7: cyclic separation III; and step 8: the autoclave is opened for aeration drying. The technical solution of the present application can greatly reduce the amount of acids, bases and industrial water used, provides good working conditions, facilitates the collection and treatment of production residues, does not produce sewage, does not cause environmental pollution and achieves zero discharge.
IPC 8 full level
C23C 22/00 (2006.01); C23C 22/73 (2006.01); C23C 22/83 (2006.01); C23G 5/00 (2006.01)
CPC (source: CN EP)
C23C 22/00 (2013.01 - EP); C23C 22/73 (2013.01 - CN EP); C23C 22/83 (2013.01 - EP); C23G 5/00 (2013.01 - EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 3591091 A1 20200108; EP 3591091 B1 20210721; CN 108754479 A 20181106; CN 108754479 B 20200421; TW 202006185 A 20200201; TW I668328 B 20190811
DOCDB simple family (application)
EP 18187806 A 20180807; CN 201810709238 A 20180702; TW 107129772 A 20180827