Gas-liquid contact apparatus

Claim 1

A GAS-LIQUID CONTACT UNIT FOR APPARATUS IN WHICH A GAS STREAM CONTACTS A FILM OF LIQUID FLOWING AS A FILM OVER THE SURFACES OF A CONTACT UNIT, SAID UNIT COMPRISING: ALTERNATE FLAT AND CORRUGATED SHEETS OF RIGID THERMOPLASTIC ORGANIC POLYMERIC MATERIAL STACKED IN CONTACT, THE CORRUGATIONS OF EACH CORRUGATED SHEET HAVING APICES FORMING LINES OF CONTACT WITH THE FLAT SHEETS; ALL THE CORRUGATED SHEETS DEFINING WITH ALL THE FLAT SHEETS A PLURALITY OF PASSAGES ALL OF WHICH EXTEND FROM ONE COMMON FACE OF THE STACK TO THE OPPOSITE FACE; THE CORRUGATIONS IN THE CORRUGATED SHEETS BEING STRAIGHT THROUGHOUT THEIR ENTIRE LENGTH SO THAT THE SAID LINES OF CONTACT AND THE PASSAGES ARE SIMILARLY STRAIGHT; THE SAID LINES OF CONTACT ON OPPOSITE SIDES OF EACH OF THE FLAT SHEETS CROSSING EACH OTHER SO AS TO BE COINCIDENT AT THE CROSS OVER POINTS; THE STACK BEING HELD TOGETHER BY ATTACHMENTS BETWEEN THE CORRUGATED SHEETS AND THE FLAT SHEETS AT LEAST SOME OF THE POSITIONS WHERE THE LINES OF CONTACT ON OPPOSITE SIDES OF THE FLAT SHEETS ARE COINCIDENT.