Abstract

The APPARATUSES, METHODS AND SYSTEMS FOR APPARATUSES, METHODS AND SYSTEMS FOR YIELD INCREASE IN A KRAFT COOKING PLANT present synergies for at least two parallel cooking plants, e.g., one producing dissolving pulp in a prehydrolysis kraft process, and the other producing kraft pulp by kraft pulping process, which may facilitate increased cooking yield in the kraft cooking plant producing kraft pulp by recovering the hemicelluloses solubilized in the acidic hydrolysate of the prehydrolysis kraft process. In some implementations, there may be no cold caustic extraction step on the dissolving pulp line as the target pulp purity can be achieved by performing just a prehydrolysis step, with reutilization of an acidic hydrolysate stream in a kraft pulp line.

IPC Classes  ?

• D21C 1/04 - Pretreatment of the finely-divided materials before digesting with acid reacting compounds
• D21C 1/02 - Pretreatment of the finely-divided materials before digesting with water or steam
• D21C 3/02 - Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
• D21C 7/06 - Feeding devices

Abstract

The apparatuses, methods and systems for yield increase in a kraft cooking plant present synergies for at least two parallel cooking plants, e.g., one producing dissolving pulp in a prehydrolysis kraft process, and the other producing kraft pulp by kraft pulping process, which may facilitate increased cooking yield in the kraft cooking plant producing kraft pulp by recovering the hemicelluloses solubilized in the acidic hydrolysate of the prehydrolysis kraft process. In some implementations, there may be no cold caustic extraction step on the dissolving pulp line as the target pulp purity can be achieved by performing just a prehydrolysis step, with reutilization of an acidic hydrolysate stream in a kraft pulp line.

IPC Classes  ?

• D21C 3/04 - Pulping cellulose-containing materials with acids, acid salts, or acid anhydrides
• D21C 9/00 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
• D21H 17/24 - Polysaccharides

Abstract

The present synergies for at least two parallel cooking plants, e.g., one producing dissolving pulp in a prehydrolysis kraft process, and the other producing kraft pulp by kraft pulping process, which may facilitate increased cooking yield in the kraft cooking plant producing kraft pulp by recovering the hemicelluloses solubilized in the acidic hydrolysate of the prehydrolysis kraft process. In some implementations, there may be no cold caustic extraction step on the dissolving pulp line as the target pulp purity can be achieved by performing just a prehydrolysis step, with reutilization of an acidic hydrolysate stream in a kraft pulp line.

IPC Classes  ?

• D21C 1/04 - Pretreatment of the finely-divided materials before digesting with acid reacting compounds
• D21C 1/02 - Pretreatment of the finely-divided materials before digesting with water or steam
• D21C 3/02 - Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
• D21C 7/06 - Feeding devices

Abstract

The high alpha and high Intrinsic Viscosity pulp production apparatuses, methods and systems (hereinafter "high-A high-IV pulp production") disclosed herein provide for pulp processing used in connection with Kraft Processes (KP) or Pre Hydrolysis Kraft Processes (PHKP), embodiments employing a Cold Caustic Extraction (CCE) stage and/or appropriate washing and bleaching stages, resulting in pulp with high Intrinsic Viscosity (IV) and high purity, such as may be as determined by alpha cellulose content, and adequate brightness for use downstream in applications such as high tensile regenerated cellulose and ether applications, or other applications employing high IV pulp with significant purity (e.g., alpha cellulose > 92%).

IPC Classes  ?

• D21C 1/06 - Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
• D21C 3/02 - Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
• D21C 9/18 - De-watering

Abstract

The HIGH ALPHA AND HIGH INTRINSIC VISCOSITY PULP PRODUCTION APPARATUSES, METHODS AND SYSTEMS (hereinafter “HIGH-A HIGH-IV PULP PRODUCTION”) disclosed herein provide for pulp processing used in connection with Kraft Processes (KP) or Pre Hydrolysis Kraft Processes (PHKP), embodiments employing a Cold Caustic Extraction (CCE) stage and/or appropriate washing and bleaching stages, resulting in pulp with high Intrinsic Viscosity (IV) and high purity, such as may be as determined by alpha cellulose content, and adequate brightness for use downstream in applications such as high tensile regenerated cellulose and ether applications, or other applications employing high IV pulp with significant purity (e.g., alpha cellulose>92%).

IPC Classes  ?

• D21C 9/10 - Bleaching
• C08B 11/193 - Mixed ethers, i.e. ethers with two or more different etherifying groups
• C08B 1/08 - Alkali cellulose
• C08B 11/08 - Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals with hydroxylated hydrocarbon radicalsEsters, ethers, or acetals thereof
• D21C 9/00 - After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters
• D21H 21/18 - Reinforcing agents
• D21H 11/16 - Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
• D21H 13/04 - Cellulose ethers
• D21H 13/08 - Synthetic cellulose fibres from regenerated cellulose
• D21H 17/26 - Ethers thereof
• D21H 17/27 - Esters thereof