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New process and a dissolving pulp manufactured by the process

A dissolving pulp and process technology, applied in the field of pulp manufacturing, can solve the problems of high cost, low total yield of dissolving pulp, etc.

Active Publication Date: 2015-02-25
萨德拉森林业主复合经济公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disclosed method describes a step that is costly and has a low overall yield of dissolving pulp

Method used

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  • New process and a dissolving pulp manufactured by the process
  • New process and a dissolving pulp manufactured by the process
  • New process and a dissolving pulp manufactured by the process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0134] Silver birch wood containing 25% xylan was cooked to pulp with a kappa number of 17 in an industrial cooking system according to the rapid displacement heating (RHD) process. The cooking temperature was 160°C, the H-factor was 350, and the residual alkali was 10 g / l. After cooking, the slurry is sieved before oxygen delignification in a two-step industrial process. The temperature in the first reactor was 85°C and the temperature in the second reactor was 102°C. The total alkali dosage is 23kg / ADT, the total oxygen dosage is 15kg / ADT, and the magnesium sulfate dosage is 3kg / ADT. After oxygen delignification, the pulp samples are removed in the wash press and washed again for further processing of the pulp in the laboratory. After oxygen delignification, the pulp had a kappa number of 9.3, a brightness of 59.8% ISO and a viscosity of 1008 m / g.

[0135] The slurry was then treated with technical white liquor of high ionic strength at a consistency of 10% and an effecti...

Embodiment 2

[0142] Embodiment 2 pulp mill technology

[0143] In this example, 4 groups of cooking pots are used, and each group of cooking pots occupies an area of ​​325m 3 Kraft pulp mills are used. The raw material consists of 93% birch and 7% other hardwoods, mainly poplar. Chips were steamed to a P-factor of 100, and activation was terminated by adding white liquor to the bottom of the digester, followed by a mixture of white and black liquor until a cooking liquor:wood-based material ratio of 3.7:1 was reached. At 160° C., a cooking step was carried out with solution circulation until an H-factor of 400 was reached. Typical properties of the cooked pulp are: Viscosity: 1100 m / g, Brightness: 45% ISO, Kappa Number: 13.

[0144] Oxygen delignification was carried out in a two-step reactor using a total oxygen amount of 23 kg / ADT without any additional amount of alkali. 1kg MgSO 4 The amount of / ADT was used to minimize degradation reactions. In two steps, the temperature was 86°C...

Embodiment 3

[0152] Embodiment 3 and the comparison of commercialization dissolving pulp

[0153] Different commercial pulps (pulp and dissolving pulp) were collected and analyzed using L&W fiber tester and CP-MAS 13 C NMR spectroscopy [Wollboldt et al., 2010 (Wood Sci. Technol. 44:533-546)] for analysis. The unique properties of dissolving pulp produced using the methods defined herein are illustrated by the measured data shown in Tables 3 and 4 below.

[0154] Table 3 Data obtained from fiber size and WRV-measurement analysis by L&W fiber tester

[0155]

[0156]

[0157] 1 Birch Paper Kraft Pulp

[0158] 2 Eucalyptus kraft pulp

[0159] 3 Birch dissolving pulp made according to Example 2

[0160] 4 Commercial prehydrolyzed eucalyptus kraft dissolving pulp

[0161] 5 commercial beech sulfite dissolving pulp

[0162] Table 4 from using CP-MAS 13 The data obtained by C NMR spectroscopic analysis

[0163]

[0164] 1 Birch Paper Kraft Pulp

[0165] 2 Birch dissolving...

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Abstract

The present document relates to processes for manufacturing pulp and more specifically to improved processes for manufacturing dissolving pulp. The processes have primarily been developed to be used in connection with large scale kraft processes, i.e. they have been designed to be incorporated into a plant. A liquor derivable from the process and comprising xylan, lignin, alkali and water is also disclosed as well as a dissolving pulp produced by the process.

Description

technical field [0001] The present invention relates to a process for making pulp, and more particularly to an improved process for making dissolving pulp. Said processes have been developed for connection with large kraft pulping processes, that is, they have been designed to be incorporated into plants. A solution comprising xylan, lignin, alkali and water, as well as a slurry, a semi-purified slurry and possible uses of these slurries are also disclosed. Background technique [0002] Dissolving pulp, also known as dissolving cellulose, is a bleached wood pulp with a high cellulose Made by chemical processing. The kraft pulping process is a commonly used pulping process in which wood is treated with an aqueous solution of a mixture of sodium hydroxide and sodium sulfide. This treatment degrades and dissolves the lignin, resulting in defibrilization of the wood fibers. [0003] In addition, the traditional manufacture of dissolving pulp by kraft pulping process, for exa...

Claims

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Application Information

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IPC IPC(8): D21C3/02C08B9/00C13K13/00D21C11/00
CPCD21C3/02D21C3/045D21C3/022D21C11/0007C08B9/00C08H8/00Y02W30/64D21C9/004D21C9/02D21C9/18D21C11/0057D21H11/04
Inventor 约翰内斯·博哥恩吉姆·帕卡斯加布里尔·希尔德安德里亚·博加尔兹
Owner 萨德拉森林业主复合经济公司
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