公开(公告)号：US3749648A

公开(公告)日：1973-07-31

申请号：US3749648D

申请日：1971-05-19

Applicant: DU PONT

Inventor： BOETTLER A ,  CLARKE A ,  WHEATLEY R

IPC: B01D11/04 ,  C01B17/94 ,  C07C51/48 ,  C07C201/16 ,  B01D15/00 ,  B01D3/38

CPC classification number: B01D11/0488 ,  C01B17/94 ,  C07C51/43 ,  C07C51/44 ,  C07C51/47 ,  C07C51/48 ,  C07C201/16 ,  C07C63/70 ,  C07C205/12 ,  C07C205/58

Abstract: A WASTE SULFURIC ACID-WATER SOLUTION CONTAINING SMALL AMOUNT OF NITRIC ACID, NITROUS ACID, HYDROFLUORIC ACID AND CHLORINATED AND NITRATED ORGANICS OF THE BENZOIC AND BENZOTRIFLUORIDE TYPE CAN BE RECONSTITUTED BY A RECOVERY PROCESS. IN ONE EMBODIMENT THE FIRST STEP WILL BE SOLVENT EXTRACTION TO REMOVE THE ORGANICS FROM THE WASTE ACID. THE SECOND STEP WILL INVOLVE STEAM STRIPPING OF THE WASTE ACID TO REMOVE THE NITRIC ACID, NITROUS ACID, HYDROFLUORIC ACID, AND THE SMALL QUANTITY OF SOLVENT WHICH WAS DISSOLVED IN THE ACID IN THE FIRST STEP. AFTER THESE PROCESS STEPS, THE RECONSTITUTED ACID WILL BE SUITABLE FOR NORMAL INDUSTRIAL USE. IN ANOTHER EMBODIMENT, THE WASTE ACID IS FIRST STEAM DISTILLED TO REMOVE THE NITRIC ACID, NITROUS ACID, HYDROFLUORIC ACID AND THE CHLORINATED AND NITRATED BENZOTRIFLUORIDE COMPOUNDS. THE STILL BOTTOMS ARE THEN COOLED AND FILTERED TO REMOVE THE BENZOIC ACID COMPOUNDS. THE FILTRATE IS THE DESIRED RECONSTITUTED ACID.