The invention relates to an improved technological method for preparing 2, 3, 4, 5-
tetrachloride phthalic anhydride. The improved technological method includes bonding 3, 4, 5, 6-tetrafluorophthalic acid and
calcium ions in water phases to generate 3, 4, 5, 6-
calcium tetrafluorophthalic acid; filtering out
solid, then removing single-molecule
calcium carbonate in water environments under the
catalytic effect of specific strong acid and strong alkali salts to generate 2, 3, 4, 5-
tetrachloride phthalic anhydride; continuing to carry out reaction on the generated 2, 3, 4, 5-
tetrachloride phthalicanhydride and
calcium carbonate to generate corresponding salt and releasing
carbon dioxide; regulating pH (potential of
hydrogen) values of water phases after the reaction is completely carried out;cooling and filtering the generated 2, 3, 4, 5-tetrachloride
phthalic anhydride to obtain final finished products. The 3, 4, 5, 6-tetrafluorophthalic acid is used as a starting material. The improvedtechnological method has the advantages that the improved technological method is high in
decarboxylation reaction yield and suitable for industrialization production, organic solvents can be omitted,
waste gas,
wastewater and industrial residues are easy to treat, and the like.