Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Treatment with particular chemical
Patent
1986-09-05
1988-03-29
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Treatment with particular chemical
127 37, 162 86, C13K 102, C13K 1300, D21C 306
Patent
active
047341629
ABSTRACT:
Pulps having a tactile sense of softness which are made from hardwoods and processes for making such pulps. The process comprises the steps of: providing hardwood chips having specified sizes; introducing the chips into a digester; removing substantially all the free oxygen from the chips within the digester; providing a cooking liquor comprising from about 0.4% to about 3% ammonia and from about 9% to about 14% sulphur dioxide; completely submerging in cooking liquor all the chips within the digester; sulfonating the lignin within the chips at a temperature of less than about 110.degree. C.; rapidly increasing the temperature to an appropriate hydrolysis temperature; hydrolyzing the lignin sulfonation products at a temperature of from about 140.degree. to about 155.degree. C. at a pH from about 2 to about 3; and rapidly reducing the temperature of the system following the hydrolysis. Pulps made by this process were made into useful tissue paper webs having enhanced softness properties.
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Bulko; Abstract ABIPC, vol. 45, No. 6, Dec., 1974, #5925(u), p. 606.
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Alvo Steve
Braun Fredrick H.
Slone Thomas J.
The Procter & Gamble & Company
Witte Monte D.
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