Pulp mill effluent color removal process

Details Pulp mill effluent color removal process Pulp mill effluent color removal process

1988-10-18

1989-10-17

Wyse, Tom

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210704, 210737, 210917, 210919, 210928, 162 29, C02F 152

Patent

active

048745219

ABSTRACT:
A method for removing color from the caustic effluent produced during kraft pulping and bleaching is characterized by heating the caustic effluent to a temperature and under a pressure sufficient to cause an alteration in the chemical structure of the lignin chromophores in the effluent. The cooked effluent is cooled and has its pressure reduced to near atmospheric pressure. An acid material, such as chlorine extract from the bleaching process, is added to the effluent to lower the pH of the effluent to between 2.6 and 3.8 to initiate flocculation of the altered chromophores of the effluent. During flocculation, the chromophores are continuously separated from the effluent in order to produce a relatively clean and color-free liquid which may be deposited in the sewer system of the pulp mill.

REFERENCES:
patent: 3652407 (1972-03-01), Paleous
patent: 4000033 (1976-12-01), Nicolle et al.
patent: 4155845 (1979-05-01), Ancelle et al.
patent: 4226673 (1980-10-01), Fremont
patent: 4420369 (1983-12-01), Eaton et al.
patent: 4724045 (1988-02-01), Ackel
patent: 4738750 (1988-04-01), Ackel

Affiliated with

Also associated with

Rating

Pulp mill effluent color removal process does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pulp mill effluent color removal process, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pulp mill effluent color removal process will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1742059