Urea sulfate and urea hydrochloride in paper and pulp...

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...

Reexamination Certificate

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Details

C162S045000, C162S158000, C162S181300, C162S189000, C210S725000, C210S928000

Reexamination Certificate

active

07029553

ABSTRACT:
The present invention relates to the use of urea sulfate or urea hydrochloride, or both, in process streams in the paper and pulping industries to control pH, to bring about flocculation or precipitation of various materials, and to replace all or part of the sulfuric acid, hydrochloric acid, and/or papermaking alum used in the paper and pulping industries.

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