Concentration of acetic acid in sulfite pulp evaporation drain by reverse osmosis

✍ Scribed by Hitoshi Masuda; Chiyoshi Kamizawa; Kunio Hata; Kingo Yokota; Tomoo Sakai; Mitsuhiro Sato

• Book ID: 104113018
• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 640 KB
• Volume: 25
• Category: Article
• ISSN: 0011-9164
• DOI: 10.1016/s0011-9164(00)82445-5

✦ Synopsis

The evaporation drain of sulfite pulp spent liquor contains few volatife fatty acids, most of which is acetic acid. The main objective of this study is to recover acetic acid as the concentrated solution (about 4%), which could be used as a culture medium of the yeast. As acetic acid can easily pass through the celIulose acetate membrane, SP drains neutralized by NaOH, NHaOH and Ca(OH), were used as the feed solutions. In all cases, concentration by reverse osmosis was successfully carried out provided the appropriate pretreatment was employed_ The recovery of acetic acid was 95.6,90.5 and 98.2% for Na-, NH,-, and Ca-drain, respectively. In addition, the recovered (permeated) water may be used as an industrial one.

INTRODUCTEON

Spent liquor produced in sufite pulp prucessing contains not only lignin and some kinds of sugar but also volatile fatty acids such its acetic acid and formic acid (I). Spent liquor is usually concentrated to such an extent that the solid content reaches SO"A by evaporation and then is subjected to combustion.