Kraft pulping process of camphorwood

A technology of kraft method and camphor wood, applied in the direction of pulping with inorganic alkali, chemical/chemical mechanical pulping, textile and papermaking, etc. The effect of improving cooking uniformity

Active Publication Date: 2019-11-12
YUEYANG FOREST & PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It has been proved by experiments that this kind of camphor wood chips for cooking camphor and camphor oil is still a good raw material for pulping. After pulping, the average fiber length is about 0.85 mm, the fiber width is about 22 microns, and the fiber aspect ratio is about 40. After beating, the strength of the sheets increases rapidly. Under the percussion degree of 400SR, the fracture length is about 7.5㎞, and the tear index is about 7.5, which can meet the company's production needs. Therefore, our company aims at this kind of boiled camphor and camphor oil. The camphor wood chips have independently designed the pulping process, which can relieve the tension of wood raw materials to a certain extent and save limited wood resources. It is far more beneficial than other processing methods for this kind of wood chips. At present, there is no patent technology disclosure in this regard.

Method used

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  • Kraft pulping process of camphorwood

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The kraft pulping process of camphor wood comprises the following preparation steps:

[0027] Step A, get 100% camphor wood chips and carry out peeling, chipping and screening operations. After screening, the length of Eucalyptus urophylla wood chips is controlled to be 10mm; Moisture content of camphor wood chips is 10%;

[0028] Step B. Put the camphor wood chips produced in step A into the cooking pot, control the cooking liquid ratio to 1:3.6, control the amount of alkali used to 16.0% (calculated as NaOH, for absolute dry wood chips), control the degree of sulfide to 16%, and cook The pressure inside the pot is controlled at 0.70Mpa. During the cooking process, the heating rate is controlled. The heating process is divided into 2 times. The first temperature rise is controlled at 125.0°C, and the non-condensable gas in the cooking pot is discharged 2-3 times. The heating time The control is 70.0 minutes. When the highest temperature is reached, the holding time is...

Embodiment 2

[0034] The kraft pulping process of camphor wood comprises the following preparation steps:

[0035] Step A, get 100% camphor wood chips and carry out peeling, chipping and screening operations. After screening, the length of Eucalyptus urophylla wood chips is controlled to be 30mm; Moisture content of camphor wood chips is 45%;

[0036] Step B. Put the camphor wood chips produced in step A into the cooking pot, control the cooking liquid ratio to 1:4.0, control the amount of alkali used to 21% (calculated as NaOH, for absolute dry wood chips), control the degree of sulfide to 20%, and cook The pressure inside the pot is controlled at 0.80Mpa. During the cooking process, the heating rate is controlled. The heating process is divided into 2 times. The first temperature rise is controlled at 130°C, and the non-condensable gas in the cooking pot is discharged 2-3 times. The heating time The control is 90 minutes. When the highest temperature is reached, the holding time is contr...

Embodiment 3

[0042] The kraft pulping process of camphor wood comprises the following preparation steps:

[0043] Step A, get 100% camphor wood chips and carry out peeling, chipping and screening operations. After screening, the length of Eucalyptus urophylla wood chips is controlled to be 35mm; Moisture content of camphor wood chips is 50%;

[0044] Step B, put the camphor wood chips produced in step A into the cooking pot, control the cooking liquid ratio to 1:4.0, control the amount of alkali used to 22% (calculated as NaOH, for absolute dry wood chips), control the degree of sulfide to 22%, and cook The pressure inside the pot is controlled at 0.90Mpa. During the cooking process, the heating rate is controlled. The heating process is divided into 2 times. The first temperature rise is controlled at 135°C, and the non-condensable gas in the cooking pot is discharged 2-3 times. The heating time The control is 120 minutes. When the highest temperature is reached, the holding time is cont...

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Abstract

The invention discloses a kraft pulping process of camphorwood. The kraft pulping process comprises the following preparation steps that 100% camphorwood pieces are taken out for peeling, chipping andscreening operations, sent into a cooking pot for cooking operation, put into a scrubber for washing operation, sent into a pressure screen for screening operation, carried out bleaching operation byusing hydrogen peroxide, and sent into a slurry tower for storage operation. According to the kraft pulping process of the camphorwood, the purpose is that the camphorwood pieces after stewed camphorand camphor oil can be reused, process flow and process parameters can be made according to the material characteristics of camphorwood, the pulping cost is low, the pulp quality is good, and needs of high-grade paper production can be fully met.

Description

technical field [0001] The invention relates to the technical field of kraft pulping, in particular to a camphor wood kraft pulping process. Background technique [0002] The paper industry is an industry closely related to the development of the national economy and social undertakings. It involves many fields such as cultural communication and civil life. The consumption level of paper and cardboard is a symbol to measure the level of modernization and civilization of a country. [0003] my country is a country with a serious shortage of wood resources. Virgin wood pulp is significantly better than non-wood fiber in terms of water filtration performance, tensile strength and tear index. China needs to consume a large amount of wood pulp fiber every year. Domestic forest resources cannot support the huge demand, so a large amount of wood pulp is imported every year. How to improve the self-sufficiency rate of wood pulp and reduce the dependence on imported wood pulp is a ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C5/00D21H11/04
CPCD21C3/02D21C5/00D21H11/04
Inventor 吴恒刘永丰肖友年林本平邓凤伟姜云周训富吴健
Owner YUEYANG FOREST & PAPER CO LTD
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