公开(公告)号：DE1667397A1

公开(公告)日：1971-06-09

申请号：DE1667397

申请日：1967-10-24

Applicant: BASF AG

Inventor： APPELT WALTER DR ,  WEITZ HANS-MARTIN DR ,  GOLSER LEOPOLD DR

IPC: B01J3/04 ,  C01B21/26

Abstract: 1,235,517. Removal of nitric acid. BADISCHE ANILIN- & SODA-FABRIK A.G. 23 Oct., 1968 [24 Oct., 1967], No. 50344/68. Heading C1A. Nitric acid is removed from aqueous solutions by reaction with carbon monoxide under pressure and at elevated temperatures. Temperatures between 100 and 300‹ C. may be used and pressures from 50-200 atmospheres. Treatment time is preferably at least 5 minutes. A stoichiometric excess of CO should be used and the CO need not be pure, provided that any other gases present are inert to the other components of the solution containing the nitric acid. Commerical CO + H 2 mixtures may be used. The product of the reaction is predominantly NO.

公开(公告)号：DE2211060A1

公开(公告)日：1973-09-20

申请号：DE2211060

申请日：1972-03-08

Applicant: BASF AG

Inventor： GOLSER LEOPOLD DR ,  SCHWARTZ ERICH DR ,  WEITZ HANS-MARTIN DR

IPC: C07C253/34 ,  C07C20060101 ,  C07C67/00 ,  C07C253/00 ,  C07C253/14 ,  C07C255/04 ,  C07C255/09 ,  C07C255/33 ,  C07C255/45 ,  C07C255/51 ,  C07C121/06

Abstract: Recovery of pure 1,4-dicyanobutenes from 1,4-dicyanobutenes containing halogen, particularly chlorine or bromine, by treatment with a hexamethylenediamine or with dihexamethylenetriamine in the liquid phase and separation of the 1,4-dicyanobutenes from the reaction products of the added hexamethylenediamine with the halogen compound.

公开(公告)号：DE1667396A1

公开(公告)日：1971-06-09

申请号：DEB0095106

申请日：1967-10-24

Applicant: BASF AG

Inventor： GOLSER LEOPOLD DR ,  WEITZ HANS-MARTIN DR ,  APPELT WALTER DR

IPC: C01B7/09 ,  C01B7/10

Abstract: 1,235,518. Bromine; nitric acid. BADISCHE ANILIN- & SODA-FABRIK A.G. 23 Oct., 1968 [24 Oct., 1967], No. 50346/68. Heading C1A. Bromine is separated from gaseous mixtures containing bromine and oxides of nitrogen (the nitrogen being in a lower valency state than five) with or without nitrosyl bromide, by adding at least such an amount of oxygen to the mixtures as is necessary for the conversion of the nitrogen of the oxides and any nitrosyl bromide to the pentavalent state, and these mixtures are then treated with water or aqueous nitric acid. Preferably the process is carried out at atmospheric pressure or up to 5 atmospheres gauge. Temperatures are used which are above the dew point of bromine but below the boiling point of the absorption liquid e.g. 65-70‹ C. at 1 atmosphere, 130-135‹ C. at 5 atmospheres. The contacting with water (or aqueous acid) may take place in a distillation type column to which the gases mixed with oxygen are admitted at the bottom and the liquid at the top. Bromine is removed at the top and nitric acid (or more concentrated nitric acid), from which bromine may be removed by boiling, is removed from the bottom of the column.