Method for producing bleached pulp for viscose fibers from bamboo

A viscose fiber and bamboo technology, which is applied in pulp beating/refining method, pulp bleaching, fiber raw materials, etc., can solve the problems such as failure to achieve expected results, short supply of long fiber resources, and increased cost of chemical fiber pulp, etc. Flexible and versatile production, simple and applicable bleaching process, reduced water and energy consumption

Inactive Publication Date: 2010-05-05
CHINA NAT PULP & PAPER RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above factors have led to a significant increase in the cost of producing pulp for chemical fiber using the above-mentioned raw materials. In addition, the rapid expansion of the chemical fiber industry has resulted in a shortage of long fiber resources such as cotton linters and hemp husks in the world.
On the other hand, with the improvement of people's life taste and attention to health, consumers have higher and higher requirements for clothing. Due to the po...

Method used

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  • Method for producing bleached pulp for viscose fibers from bamboo
  • Method for producing bleached pulp for viscose fibers from bamboo
  • Method for producing bleached pulp for viscose fibers from bamboo

Examples

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Embodiment 1

[0032] The raw material used in this embodiment is the bamboo wood. Raw materials are cut by a bamboo cutter, with a size of 2-4cm; qualified raw materials are soaked at normal pressure at 95°C for 180 minutes; cooking conditions: total alkali 22%, sulfide degree 25%, AQ0.05%, temperature 170°C, time 120min. After cooking into pulp, wash and sieve. The good pulp is concentrated and bleached. The bleaching process is HEpPA four-stage bleaching. The conditions of the H stage are: 4% hypochlorite (calculated as available chlorine), the temperature is 45°C, the concentration is 10%, and the time is 90min; the conditions of the Ep stage are: sodium hydroxide 2% (Na 2 O meter), hydrogen peroxide 1%, temperature 85 ℃, concentration 15%, time 60min; P section condition is: hydrogen peroxide 2%, sodium hydroxide 1% (NaOH 2 O gauge), temperature 85°C, concentration 20%, time 60min; Section A: hydrochloric acid 2%, time 60min, temperature 30°C, concentration 5%. The whiteness of the o...

Embodiment 2

[0034] The present embodiment adopts red bamboo as a raw material, and the raw material is chipped by a bamboo cutting machine with a size of 2 to 4 cm. Qualified raw materials are pre-hydrolyzed, the liquid ratio is 1:6, the temperature is 170°C, and the time is 90 minutes. The cooking conditions are: temperature 170°C, time 120min, total alkali 17.5%, degree of sulfide 25%, green oxygen 0.05%. The good pulp bleaching process is HPA, the conditions of the H section are: hypochlorite 5% (calculated as available chlorine), the temperature is 45°C, the concentration is 10%, and the time is 90min; the conditions of the P section are: hydrogen peroxide 3%, sodium hydroxide 1.5 % (Na 2 O meter), temperature 85°C, concentration 20%, time 60min; Section A: hydrochloric acid 3%, time 60min, temperature 30°C, concentration 5%. The whiteness of the obtained pulp is ≥83% ISO, the content of Type A cellulose is ≥91%, the ash content is ≤0.15%, and the dynamic viscosity is 8.6mPa.S, meet...

Embodiment 3

[0036] The present embodiment adopts red bamboo as raw material, and wherein except pulp bleaching, other steps are the same as embodiment 2. The good pulp bleaching process is HA, and the conditions of the H section are: hypochlorite 6% (calculated as available chlorine), temperature 45°C, concentration 10%, time 150min; A section: hydrochloric acid 2%, time 60min, temperature 30°C, concentration 5%. The whiteness of the obtained pulp is ≥77% ISO, the content of cellulose A is ≥92%, the ash content is ≤0.18%, and the dynamic viscosity is 9.7mPa.S, meeting the requirements of bamboo pulp products for viscose staple fiber in the national textile industry standard.

[0037] From Example 1, Example 2 and Example 3, it can be seen that the performance of the pulp is superior, and can meet the requirements of the bamboo pulp product for viscose staple fiber in the national textile industry standard; Methods The bamboo pulp pulping process saves energy consumption, makes full use o...

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Abstract

The invention discloses a method for producing bleached pulp from bamboo, which relates to the fields of pulping and textile and comprises the following steps: (1) cutting bamboo into bamboo pieces which are 1-5cm long and 1-3cm wide; (2) carry out prehydrolysis by soaking the bamboo pieces with water under 10-100 DEG C for 1-10 hours or stewing the bamboo pieces under at least 100 DEG C for 2-300 minutes, wherein the ratio of the bamboo pieces to the liquid for water soaking is 1:1-1:10, and the liquor-to-wood ratio is 1:2-1:10; (3) stewing by a sulfate method at 100-200 DEG C for 60-180 minutes, wherein the solution used for stewing comprises 1-30% of sodium hydroxide, 0-1% of anthraquinone, 0-2% of green oxygen and 1-30% of sodium sulfide, and the liquor-to-wood ratio is 1:1-1:10; (4) processing the product through HEpPA or HPA or HA procedure, wherein the HEpPA procedure comprises the steps of bleaching the cleaned pulp with hypochlorite (H), performing alkali extraction reinforced by hydrogen peroxide (Ep), bleaching with hydrogen peroxide (P) and performing acid-treating (A); and (5) washing the bleached pulp, and drying to obtain the bleached bamboo pulp. The method is suitable for various bamboo materials, and the obtained pulp has superior performance and conforms to the requirements of bamboo pulp products specified in national textile industry standard.

Description

technical field [0001] The invention relates to a method for producing bleached bamboo pulp for viscose fiber from bamboo, and the technology spans the fields of pulping and textiles. Background technique [0002] As we all know, the current pulp production mostly uses wood, or cotton linters, or hemp husks as the main raw materials, and undergoes a series of processes to obtain the raw material used in the chemical fiber industry-pulp. Due to the high content of Type A cellulose in cotton linters, hemp husks and wood raw materials, it is used to produce pulp for chemical fiber with high yield, low production cost, easy production, and good quality pulp. It is also the world's leading pulp producer. main ingreadient. Due to the prosperity of my country's textile industry in recent years, the prices of long-fiber raw materials such as cotton linters and hemp husks have gradually increased; and due to the prosperity of the paper industry, timber resources are extremely tight,...

Claims

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Application Information

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IPC IPC(8): D21H11/12D21B1/00D21B1/04D21C1/02D21C3/02D21C9/18D21D1/00D21D5/00D21C9/12D21H17/64D21H17/66D21H17/05
Inventor 陈彬薛崇昀戴锦亮聂怡穆军田超张凯贺文明
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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