公开(公告)号：DE2646804A1

公开(公告)日：1978-04-20

申请号：DE2646804

申请日：1976-10-16

Applicant: BASF AG

Inventor： GETTERT HANS DIPL CHEM DR ,  FROMM HERMANN DIETER DIPL CHEM ,  MOLZAHN MARTIN DIPL ING DR ,  SCHIER ERNST-JUERGEN DIPL CHEM ,  SCHNEEHAGE HANS HENNIG DIPL CH

IPC: B01D53/14 ,  C01C1/12

Abstract: To isolate ammonia from gas mixtures containing ammonia and carbon dioxide, the gas mixture is first partially absorbed in a solvent, with residence times of at most 0.1 second, and the non-absorbed gas is then separated from the solution obtained. The solution is then subjected to a first desorption stage, in which only the ammonia present in an excess over a molar ratio of 3 parts of ammonia to 1 part of carbon dioxide is expelled by heating, and the entrained carbon dioxide is washed out of the expelled ammonia by means of solutions containing free ammonia. The solution remaining after the first desorption stage is substantially freed from ammonia and carbon dioxide in a second desorption stage and the expelled gas, containing solvent, together with fresh gas mixture is fed to the adsorption stage, while the solvent obtained from the second desorption stage is employed for the absorption.

公开(公告)号：DE3128511A1

公开(公告)日：1983-02-03

申请号：DE3128511

申请日：1981-07-18

Applicant: BASF AG

Inventor： HAMMER HANS DIPL ING ,  HERTEL OTTO DIPL CHEM DR ,  IZI KAMURAN DIPL ING ,  JESCHEK GERHARD DIPL CHEM DR ,  MOLZAHN MARTIN DIPL ING DR

IPC: F28B1/02 ,  F28D7/16 ,  F28D7/00

Abstract: Shell-and-tube heat exchanger having an inlet opening for product vapour, inlet and and outlet openings for cooling agent which is conducted in the heat exchanger (transfer) tubes, a purge stub for removing inert gases, and a discharge stub for product condensate, in which a) the shell-and-tube heat exchanger (1) is arranged vertically, b) the arrangement of the heat exchanger tubes (2) in the region of the side where the product vapour flows at first has large spacings, which are increasingly reduced in the course of the path of the main flow, and c) a plurality of purge stubs for inert gases (5) are arranged one above another opposite the inlet opening for product vapour (4) in the region of the tightest packing of the heat exchanger tubes (2).