Gasifying black liquor with recycling of generated hydrogen sulp

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Including recovery of organic by-product

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

162 301, 162 31, 162 51, D21C 1112, D21C 1106

Patent

active

056606850

ABSTRACT:
A method of preparing a digesting liquor having high sulphidity from a spent liquor obtained from digesting cellulosic fiber material, optionally without a conventional causticizing step is provided. Thermal decomposition of the spent liquor is conducted under reducing conditions in a reactor at a pressure of from atmospheric pressure up to about 150 bar and at a temperature of about 500.degree. to 1600.degree. C. so that a combustible gas phase containing hydrogen sulphide is formed in the reactor and extracted therefrom, and a phase of solid or molten material of substantially sodium sulphide or potassium sulphide, or mixtures thereof. The solid or molten material is dissolved in an aqueous liquid to produce said digesting liquor. The invention hydrogen sulphide is recovered from the gas phase and returned to the reactor to be present during the thermal decomposition of the spent liquor.

REFERENCES:
patent: 3762989 (1973-10-01), Tinpe
patent: 4198388 (1980-04-01), Laslo et al.
patent: 4872950 (1989-10-01), Andersson et al.
patent: 4957515 (1990-09-01), Hagarty
patent: 5220782 (1993-06-01), Brown et al.
patent: 5277884 (1994-01-01), Shinnar et al.
patent: 5382322 (1995-01-01), Magnotta et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Gasifying black liquor with recycling of generated hydrogen sulp does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Gasifying black liquor with recycling of generated hydrogen sulp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gasifying black liquor with recycling of generated hydrogen sulp will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1985392

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.