Title: Coking of waste kraft pulping liquors at lowered pH

Abstract: The liquid phase coking of waste kraft pulping liquors can be effected with a shorter residence time in the coking means at lower temperature, and lower pressure by reducing the pH of such liquors by at least one pH unit before coking. Products are lower in malodorous organic sulfur components than those produced at a higher pH. The lowering of the pH is achieved by adding sulfur dioxide to the liquor either as free SO.sub.2 or as an aqueous solution of SO.sub.2.

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Inventors: Hess, Howard V. (Glenham, NY, US)
Cole, Edward L. (Fishkill, NY, US)
Franz, William F. (Gardiner, NY, US)

Application Number: 384672
Filing Date: 1973-08-01
Publication_date: 1976-03-16
Assignee: Texaco Inc. (New York, NY)
Primary Class(es): 162/31 423/207, 423/DIG3
Other Classes:
US Patent Ref:

2752243	Jun, 1956	Barton et al.	162/31.
3272739	Sep, 1966	Earle et al.	210/71.
3595806	Jul, 1971	Prahacs et al.	23/48.
3607619	Sep, 1971	Hess et al.	162/30.
3649534	Mar, 1972	Schotte	210/63.
3654071	Apr, 1972	Brannland et al.	23/48.
3717545	Feb, 1973	Hess et al.	162/36.
3836427	Sep, 1974	Cole et al.	162/31.

Other Refs:
Primary Examiner: Bashore, S. Leon
Assistant Examiner: Smith, William F.
Attorney: Whaley; T. H., Ries; C. G., Archer; Henry W.