The present invention relates to the field of pharmaceutical chemicals, in particular to the synthetic method of
acetylcysteine injection, comprising the steps of: 1) adding water for injection into a stainless steel preparation tank, continuing to pass through
nitrogen to displace the air in the preparation tank, then adding
disodium edetate at 50 55 DEG C, stirring, and obtaining a
disodium edetate aqueous solution; 2) adding water for injection into another stainless steel preparation tank, continuing to pass through
nitrogen to displace the air in the preparation tank, adding
acetylcysteine, stirring and dissolving, using basic
amino acid to adjust pH to 7.0 7.3, obtaining the
acetylcysteine aqueous solution; 3) continuing to pass through
nitrogen into the stainless steel preparation tank equipped with
disodium edetate, the acetylcysteine
aqueous solution obtained is added into the disodium edetate aqueous solution, stirring and dissolving, using basic
amino acid to adjust pH to 7.0 7.3, filtering, sterilizing after canning, obtaining acetylcysteine injection. The present invention uses basic
amino acid to adjust pH so that the impurities such as
hydrogen sulfide in the
system are significantly reduced.