Title:
【発明の名称】希薄硫酸溶液の濃縮方法
Document Type and Number:
Japanese Patent JP2002521301
Kind Code:
A
Abstract:
A process is provided for increasing the concentration of sulfuric acid in a waste solution of sulfuric acid previously used to produce titanium dioxide. The waste solution of sulfuric acid is fed into a first heat exchanger/evaporator stage that operates at a sulfuric acid concentration of less than 30%. A portion of the solution discharged from the first heat exchanger/evaporator is fed into a heat exchanger/evaporator that uses waste heat and operates at a sulfuric acid concentration that is greater than 40%, while the remainder of the solution discharged from the first heat exchanger/evaporator and the solution discharged from the heat exchanger/evaporator using waste heat is fed into a second heat exchanger/evaporator that operates at a sulfuric acid concentration that is greater than 50%.
Inventors:
Butsuyu, Ames Henry
Application Number:
JP2000562299A
Publication Date:
July 16, 2002
Filing Date:
July 29, 1999
Export Citation:
Assignee:
Theoxide Group Services Limited
International Classes:
C01B17/88; (IPC1-7): C01B17/88
Attorney, Agent or Firm:
Heiyoshi Odashima