Sulfate wood pulp short-sequence ECF bleaching process X/Z/D-EOP-D or X/D/Z-EOP-D

A short-program, sulfate-based technology, applied in pulp bleaching, pulping with inorganic alkali, etc., can solve environmental hazards and other problems, achieve the effects of reduced water consumption, reduced chlorine dioxide consumption, and easy promotion

Pending Publication Date: 2020-11-24
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ECF bleaching technology using ClO 2 Instead of traditional chlorine and hypochlorite, it significantly reduces environmental pollution, but ClO 2 Chlorine in bleach still a hazard to the environment

Method used

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  • Sulfate wood pulp short-sequence ECF bleaching process X/Z/D-EOP-D or X/D/Z-EOP-D
  • Sulfate wood pulp short-sequence ECF bleaching process X/Z/D-EOP-D or X/D/Z-EOP-D
  • Sulfate wood pulp short-sequence ECF bleaching process X/Z/D-EOP-D or X/D/Z-EOP-D

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Proceed as follows:

[0052] (1) ECF bleaching: X / Z / D-E was carried out on the eucalyptus kraft pulp after oxygen delignification (the specific preparation method was the same as steps 1) and 2) in Comparative Example 1). OP -D or X / D / Z-E OP -D three-stage bleaching program bleaching.

[0053] First, perform xylanase-assisted bleaching (X), and the process conditions are: the amount of xylanase is 10U / g 浆 , pulp concentration 15%, pH=5, bleaching temperature 55°C, bleaching time 60min; after bleaching, the pulp does not need to be washed directly for ozone bleaching (Z), bleaching temperature 55°C, pulp concentration 15%, pH=2, bleaching The time is 2min, the amount of ethylene glycol is 2%, and the amount of ozone is 0.3%; after the bleaching, the pulp does not need to be washed and directly subjected to chlorine dioxide bleaching (D), and the process conditions are: ClO 2 The dosage is 0.5%, the pulp concentration is 15%, pH=2, the bleaching temperature is 55℃, and...

Embodiment 2

[0061] Proceed as follows:

[0062] (1) ECF bleaching: X / Z / D-E was carried out on the eucalyptus kraft pulp after oxygen delignification (the specific preparation method was the same as steps 1) and 2) in Comparative Example 1). OP -D or X / D / Z-E OP -D three-stage bleaching program bleaching.

[0063] First, perform xylanase-assisted bleaching (X), and the process conditions are: pulp concentration 12%, xylanase dosage 10U / g 浆 , pH=5, bleaching temperature 60°C, bleaching time 60min; after bleaching, the pulp does not need to be washed directly for ozone bleaching (Z), bleaching temperature 60°C, pulp concentration 12%, pH=2, bleaching time 3min, ozone dosage 0.3%, the amount of ethylene glycol is 2%; after the bleaching, the pulp does not need to be washed directly for chlorine dioxide bleaching (D), and the process conditions are: ClO 2 The dosage is 1.0%, the pulp concentration is 12%, pH=2, the bleaching temperature is 60℃, and the bleaching time is 30min; OP Section tr...

Embodiment 3

[0070] Proceed as follows:

[0071] (1) ECF bleaching: X / Z / D-E was carried out on the eucalyptus kraft pulp after oxygen delignification (the specific preparation method was the same as steps 1) and 2) in Comparative Example 1). OP -D or X / D / Z-E OP -D three-stage bleaching program bleaching.

[0072] First, perform xylanase-assisted bleaching (X), and the process conditions are: pulp concentration 11%, xylanase dosage 10U / g 浆 , pH=8, bleaching temperature 70℃, bleaching time 60min; after bleaching, the pulp does not need to be washed directly for ozone bleaching (Z), bleaching temperature 70℃, pulp concentration 11%, pH=3, bleaching time 4min, ozone dosage 0.3%, the amount of ethylene glycol is 2%; after the bleaching, the pulp does not need to be washed directly for chlorine dioxide bleaching (D), and the process conditions are: ClO 2 The dosage is 0.5%, the pulp concentration is 11%, pH=3, the bleaching temperature is 70℃, and the bleaching time is 30min; OP Section trea...

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Abstract

The invention belongs to the technical field of papermaking, and relates to a sulfate wood pulp short-sequence ECF bleaching process X/Z/D-EOP-D or X/D/Z-EOP-D. The process comprises the following steps: (1) sequential bleaching (X/Z/D or X/D/Z): carrying out X/Z/D or X/D/Z sequential bleaching on sulfate wood pulp subjected to oxygen delignification to obtain semi-bleached paper pulp; (2) enhanced alkali extraction (EOP): carrying out hydrogen peroxide and oxygen enhanced alkali extraction treatment on the sequentially bleached paper pulp to further dissolve out residual lignin in the pulp; and (3) supplementary bleaching (D): carrying out chlorine dioxide supplementary bleaching on the paper pulp to obtain fully bleached paper pulp (88% ISO). Through the above bleaching treatment, the paper pulp with high whiteness and strength index is obtained. Compared with a traditional D-EO-D-D bleaching sequence, X/Z/D-EOP-D or X/D/Z-EOP-D bleaching sequence reduces one chlorine dioxide bleaching section, and under the condition that the final whiteness is the same, the chlorine dioxide consumption is reduced by 30% or above, and the water consumption is reduced by 20% or above.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a short-program ECF bleaching process X / Z / D-EOP-D or X / D / Z-EOP-D of kraft wood pulp. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The production and consumption level of paper and cardboard has become an important indicator to measure a country's economic development level and social progress. Although China has become the world's largest producer and consumer of paper products, the paper industry is faced with a shortage of fiber resources and a heavy load of environmental pollution. Therefore, low-carbon economy and green technology have become the themes of the development of the paper industry. Exploring clean and bleaching technology with low energy consumption and low pollution has always been a research hotspot of scientific a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C9/10
CPCD21C3/02D21C9/10
Inventor 陈嘉川杨桂花张凯田中建吉兴香吕高金高其超
Owner QILU UNIV OF TECH
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