Yes. We add some FeCl3 in the paper with sour water and observe if change the colour to blue. How long does it take to change the colour ? In our case is +/- 12 h. We try to keep the wash water +/- 8 % related with the feed. The water is from the SWS (retified sou water). We add 60 % wash water in the interestage gás compressor. We observe that the wash water limit is 6 %. If the spot test show a “positive” we increase the water from 6 to 8 %. How is it the water wash limit ? What Kind of water do you use ?
