The invention discloses a two-stage method industrial
continuous production process of a
pigment yellow 139 condensation section, relates to the technical field of
chemical engineering, and solves the problems that the existing production process is complicated, produced
waste gas is inconvenient to recycle, the environment is easily polluted, the safety influence is relatively great, and the product supply is severely insufficient. Dropwise adding part of the
phthalocyanine solution and the
barbituric acid solution into the R1 reactor at the same time, starting
nitrogen at the bottom of the R1 reactor, and generating
ammonia gas through gas stripping
discharge reaction of the
nitrogen; a second reaction stage: extracting the reaction liquid 1 from the reactor R1, continuously dropwise adding the reaction liquid 1 into the reactor R2, dropwise adding a dilute sulphuric acid solution and the remaining
phthalocyanine solution, and controlling the dropwise adding speed of the dilute sulphuric acid solution to keep the pH value of the
system acidic; and extracting the reaction liquid 2 in the R2 reactor, and treating to obtain the
pigment yellow 139. The use amount of
sulfuric acid is reduced by 30-60%, and the equipment
corrosion risk and the equipment investment are reduced.