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A kind of bleaching method of simao pine chemical pulp

A technology of Simao pine and chemical pulp is applied in the field of microwave-assisted low-pollution bleaching, which can solve the problems of less research and achieve the effects of less viscosity loss, convenient operation and strong process adaptability.

Active Publication Date: 2020-02-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some scholars in China are studying the impact of microwaves on pulping and papermaking, but most of the research is focused on rice straw and hardwoods such as poplar. Wood raw materials, relatively little research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: the bleaching method of this Simao Pine chemical pulp, specific content is as follows:

[0024] In this example, the Simao Pine chemical pulp is cooked by the conventional kraft method using Simao Pine wood chips as the raw material. After the obtained chemical pulp is screened, the fiber raw material for bleaching is extracted. The Simao Pine has a Kappa value of 30.8 and a viscosity of 1320 mL / g. Pulp enters the bleaching process, the steps are as follows:

[0025] (1) Microwave synergistic peracetic acid treatment: add 0.5% of diethyltriaminepentaacetic acid in dry mass of pulp raw material, and stabilizer Na in order of 0.2% dry mass of pulp raw material in Simao pine pulp 2 P 2 o 7 and 2.0% CH 3 COOOH (measured by active oxygen AO), add distilled water to make the pulp concentration 10%, then use NaOH to adjust the pulp pH value to 5, put it into the microwave oven, turn on the stirrer of the microwave reactor and stir for 3 minutes, then put it un...

Embodiment 2

[0033] Embodiment 2: the bleaching method of this Simao Pine chemical pulp, specific content is as follows:

[0034] In the example, the Simao Pine chemical pulp is cooked by the conventional caustic soda method-anthraquinone method using Simao Pine wood chips as raw material. After the obtained chemical pulp is screened, the fiber raw material for bleaching is extracted, with a Kappa value of 29.4 and a viscosity of 1362 mL / g. Simao pine pulp enters the bleaching process, the steps are as follows:

[0035] (1) Microwave synergistic peracetic acid treatment: add 0.5% ethylenediaminetetraacetic acid (EDTA) of the dry mass of the pulp raw material, and a stabilizer Na (Na 2 P 2 o 7 and 2.5% CH 3 COOOH (measured by active oxygen AO), add distilled water to make the pulp concentration 12%, then use NaOH to adjust the pulp pH value to 6, put it into the microwave oven, turn on the stirrer of the microwave reactor and stir for 3 minutes, then put it under the microwave power of 1...

Embodiment 3

[0043] Embodiment 3: the bleaching method of this Si Mao pine chemical pulp, specific content is as follows:

[0044] In the examples, the Simao pine chemical pulp is cooked with the conventional ammonium sulfite method using Simao pine wood chips as the raw material. After the obtained chemical pulp is screened, the fiber raw material for bleaching is extracted. The Simao pine wood chips have a Kappa value of 33.6 and a viscosity of 1386 mL / g. Loose pulp enters the bleaching process, the steps are as follows:

[0045] (1) Microwave synergistic peracetic acid treatment section: add 0.8% of diethyltriaminepentaacetic acid and 0.15% of stabilizer Na 2 P 2 o 7 and 1.5% CH 3 COOOH (measured by active oxygen AO), add distilled water to make the pulp concentration 8%, then use NaOH to adjust the pulp pH value to 7, put it in the microwave oven, turn on the stirrer of the microwave reactor and stir for 3 minutes, then put it under the microwave power of 800W Heat up to 80°C for 3...

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Abstract

The invention discloses a bleaching method of chemical pulp of pinus kesiya. The bleaching method comprises the steps of taking the chemical pulp of the Yunnan special pinus kesiya, and performing cleaning microwave associated four-section chloride-free bleaching, wherein a first section adopts microwave associated peroxyacetic acid treatment; a second section adopts microwave associated hydrogen peroxide reinforced alkali extraction; a third section adopts microwave associated peroxyacetic acid treatment; and a fourth section adopts microwave associated hydrogen peroxide bleaching. Pinus kesiya bleached pulp prepared by the method has the characteristics of high whiteness and good strength; the bleaching time is shorter; and wastewater pollution is low.

Description

technical field [0001] The invention belongs to the technical field of chemical pulp bleaching of wood raw materials, in particular to a microwave synergistic low-pollution bleaching method of Simao pine chemical pulp. Background technique [0002] Simao pine, scientific name Kaxi pine, is one of the main fast-growing timber tree species in Yunnan Province, and is the fastest-growing tree species among coniferous wood papermaking raw materials currently used in China. Pulp bleaching plays an important role in the production process of pulp and paper, and is closely related to the quality of pulp and paper, the consumption of materials and energy, and the impact on the environment. Chlorine-free bleaching is the development trend of the pulp bleaching industry. Most of its bleaching agents are non-environmentally harmful drugs. The degradation products after pulp bleaching are basically non-toxic, will not pollute the atmosphere, and are easy to biodegrade. [0003] Microwav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/16
CPCD21C9/1015D21C9/1057D21C9/163
Inventor 何洁高欣张恒陈克利
Owner KUNMING UNIV OF SCI & TECH
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