Global Patent Index - EP 1068373 A1

EP 1068373 A1 20010117 - AUTOMATED CHEMICAL PROCESS CONTROL SYSTEM

Title (en)

AUTOMATED CHEMICAL PROCESS CONTROL SYSTEM

Title (de)

AUTOMATISIERTES ANALYSESYSTEM FÜR CHEMISCHE PROZESSE

Title (fr)

SYSTEME AUTOMATISE DE COMMANDE DE PROCEDES CHIMIQUES

Publication

EP 1068373 A1 20010117 (EN)

Application

EP 99916615 A 19990409

Priority

  • US 9907918 W 19990409
  • US 8124098 P 19980409

Abstract (en)

[origin: WO9953121A1] A chemical delivery system for a liquid chemical having predetermined chemical constituents employs an analyser for determining the proportion of one of the predetermined chemical constituents in the liquid chemical to be delivered. Precise quanta of samples of the liquid chemical are delivered to the analyzer by a precision analyzer sample delivery arrangement in the form of an automated sample syringe. Information relative to the determination by the analyzer of the proportion of at least one of the predetermined chemical constituents in the liquid chemical to be delivered is stored in a controller, which may be implemented in a microcomputer. The controller then controls a replenisher that issues a precisely controlled quantity of the predetermined chemical constituent to the source of the liquid chemical. Analyses are repeated and subjected to checks on values and trends to ensure the result is accurate, reasonable, and repeatable. During titration analysis, multiple phases of operation are implemented to control the titration particularly near the end point to ensure accuracy. After each analysis, a cleanup procedure is implemented using a purge gas, such as air, and a rinse solvent, which forcibly clears out the prior sample. The sample syringe is repeatedly cycled until it too clears out the prior sample.

IPC 1-7

C23F 1/08; G01N 31/16; G05D 21/02

IPC 8 full level

B01F 3/12 (2006.01); B01F 15/04 (2006.01); B01J 4/02 (2006.01); B01L 3/00 (2006.01); B24B 37/04 (2012.01); B24B 57/02 (2006.01); C23F 1/08 (2006.01); G01N 1/00 (2006.01); G01N 31/16 (2006.01); G05D 11/13 (2006.01); G05D 21/00 (2006.01); G05D 21/02 (2006.01); H01L 21/304 (2006.01)

CPC (source: EP KR)

B01F 23/59 (2022.01 - EP); B01F 35/82 (2022.01 - EP); B01L 3/565 (2013.01 - EP); B24B 37/04 (2013.01 - EP); B24B 57/02 (2013.01 - EP); G01N 31/164 (2013.01 - EP); G01N 35/1097 (2013.01 - EP); G05D 11/138 (2013.01 - EP); G05D 21/00 (2013.01 - KR); G05D 21/02 (2013.01 - EP)

Designated contracting state (EPC)

BE DE GB NL

DOCDB simple family (publication)

WO 9953121 A1 19991021; AU 3489999 A 19991101; EP 1068373 A1 20010117; JP 2002511613 A 20020416; KR 20010072569 A 20010731

DOCDB simple family (application)

US 9907918 W 19990409; AU 3489999 A 19990409; EP 99916615 A 19990409; JP 2000543663 A 19990409; KR 20007011146 A 20001006