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Poplar rod core sulfate pulping process

A sulfate and rod core technology, which is applied in the fields of pulping with inorganic alkali, pulping of cellulose raw materials, pulp bleaching, etc., can solve the problem of particularly serious corrosion of poplar rod cores, affecting pulping quality, pulping and bleaching. and other problems, to achieve the effect of accelerating delignification speed, low pulping cost and reducing lignin content

Inactive Publication Date: 2020-10-27
YUEYANG FOREST & PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It has been proved by experiments that the remaining rod core after processing this kind of poplar wood into board skin is still a good raw material for pulping. After pulping, the average fiber length is about 0.72 mm, the fiber width is about 22 microns, and the fiber aspect ratio is about 33. , after beating, the strength of the sheets increases rapidly. Under the percussion degree of 40°SR, the fracture length is about 6.8Km, and the tear index is 7.0mN.m 2 About / g, which can meet the company's production needs, but poplar wood has a white rot fungus called polypores that corrodes wood from the inside out during the growth period, and can decompose cellulose, the main component of wood, for pulping and bleaching Caused impact, especially poplar rod core corrosion is particularly serious, the existing decayed wood can be removed during conventional wood chip screening and chipping, but this removal method is a physical method and cannot be removed completely, and the screened wood chips will still have residual white Rot fungi still have an impact on the quality of pulping. Therefore, our company independently designed the pulping process for this poplar core, which can relieve the tension of wood raw materials to a certain extent, fully save limited wood resources, and solve the problem of poplar wood. There is no patented technology disclosure in this regard for the problem that the rod core affects the quality of the slurry

Method used

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  • Poplar rod core sulfate pulping process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A poplar core kraft pulping process, which comprises the following preparation steps:

[0028] Step A: Take the poplar stick core for chipping and pre-screening. After screening, the length of the wood chips is controlled to be 10-50mm; 12.2%;

[0029] Step B: Put the poplar stick core wood chips prepared in step A into the cooking pot, then add the Chinese medicine mixture, the cooking solid-liquid ratio is controlled to 1:3.7, and the weight of the Chinese medicine extraction mixture accounts for 3% of the wood chip mass; use NaOH Calculated, the mass of alkali used accounted for 21% of the mass of dry wood chips, and the heating rate was controlled during the cooking process. The heating process was divided into two times, the first indirect heating, the second direct heating, and the first heating to 130 ° C. The heating time is controlled at 40 minutes, and when the highest temperature is reached, it is kept for 30 minutes, and then the operation of discharging no...

Embodiment 2

[0035] A poplar core kraft pulping process, which comprises the following preparation steps:

[0036] Step A: Take the poplar stick core for chipping and pre-screening. After screening, the length of the chips is controlled to be 15-45mm; 10%;

[0037] Step B: Put the poplar stick core wood chips prepared in step A into the cooking pot, then add the Chinese medicine mixture, the cooking solid-liquid ratio is controlled to 1:3.5, and the weight of the Chinese medicine extraction mixture accounts for 5% of the wood chip mass; use NaOH Calculated, the mass of alkali used accounts for 18% of the mass of dry wood chips, and the heating rate is controlled during the cooking process. The heating process is divided into two times, the first indirect heating, the second direct heating, and the first heating to 135 ° C. The heating time is controlled at 30 minutes, and when the highest temperature is reached, it is kept for 20 minutes, and then the operation of discharging the non-conden...

Embodiment 3

[0043] A poplar core kraft pulping process, which comprises the following preparation steps:

[0044] Step A: Take the poplar stick core for chipping and pre-screening. After screening, the length of the chips is controlled to be 20-55mm; 50%;

[0045] Step B: Put the poplar stick core wood chips prepared in step A into the cooking pot, then add the Chinese medicine mixture, the cooking solid-liquid ratio is controlled to 1:4.0, and the weight of the Chinese medicine extraction mixture accounts for 4% of the wood chip mass; Calculated, the mass of alkali used accounts for 22% of the mass of dry wood chips, and the heating rate is controlled during the cooking process. The heating process is divided into two times, the first indirect heating, the second direct heating, and the first heating to 140 °C. The heating time is controlled at 50 minutes, and when the highest temperature is reached, it is kept for 25 minutes, and then the non-condensable gas in the cooking pot is disch...

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Abstract

The invention discloses a poplar rod core sulfate pulping process, and relates to the technical field of pulping. The preparation method comprises the following steps of: chipping and screening the remaining rod cores of poplar rotary-cut slabs; then performing feeding into a cooking pot for cooking operation, conducting washing operation in washing equipment, then feeding the product into a pressurized screen for screening operation, adopting hydrogen peroxide for bleaching and other operations, sending the treated product into a pulp storage tower for storage, reutilizing the poplar rod cores left after slab processing, and formulating a technological process according to material characteristics of poplar. The pulping cost is low, the pulp quality is good, and the requirements of high-grade paper production can be completely met.

Description

technical field [0001] The invention relates to the technical field of pulping, in particular to a poplar core kraft pulping process. Background technique [0002] 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. Therefore, China needs to consume a large amount of wood pulp fiber every year. Because domestic forest resources cannot support the huge demand, a large amount of wood pulp and wood chips are imported every year. How to improve the self-sufficiency rate of wood pulp and reduce the dependence on imported wood pulp is a major issue facing my country's paper industry. On the other hand, wood fiber raw materials, especially softwood or coniferous trees, are generally more than 15 years old due to their long growth cycle. Typically, virgin chemical wood pulp is sought to be produced from hardwoods, ie hardwoods, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C3/00D21B1/02D21C7/00D21C9/16D21C9/02D21C9/18D21D5/02
CPCD21C3/02D21C3/006D21B1/02D21C7/00D21C9/163D21C9/02D21C9/18D21D5/02
Inventor 刘永丰朱宏伟史梦华吴恒洪嘉远邓凤伟余政
Owner YUEYANG FOREST & PAPER CO LTD
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