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Process for integrating pulping and bleaching by using ultrasonic wave

An ultrasonic and pulping technology, applied in the field of bleached pulp, can solve the problems of adding a large amount of high-temperature cooking, and the application of ultrasonic technology has not yet been seen, and achieve the effect of reducing the number of equipment and energy consumption, increasing the number of reactive centers, and increasing the specific surface area.

Active Publication Date: 2011-02-23
FUJIAN QINGSHAN PAPER INDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The problems in this process route are: 1. A large amount of chemical agents need to be added in the cooking stage to carry out high-temperature cooking
There are no reports on the application of ultrasonic technology in the industrial continuous production of papermaking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Put qualified wheat straw processed by the material preparation workshop in the ultrasonic reactor of the workshop, add water to form a raw material solution with a forage concentration of 10%-25%; The reinforcing additive is ethylenediaminetetraacetic acid. Turn on the reactor jacket oil heating device. When the temperature of the forage rises to 70°C-160°C, turn on the ultrasonic generator. The power of the ultrasonic wave is 0.35-0.85 kW / cubic material, and the frequency is 15 -80KHZ, ultrasonic waves act on wheat straw intermittently, and react for 2-4.5 hours; the fiber and lignin of the forage are separated under the action of ultrasonic waves, and the pressure in the reactor is used to open the spray valve to make the slurry quickly; Squeeze out the water and leached matter in the slurry, and then clean the slurry; finely grind the slurry through a high-consistency refiner, and then remove the non-dissociated grass knots and forage through a screening system, and ...

Embodiment 2

[0028] Put the qualified straw processed by the material preparation workshop into the ultrasonic reactor in the workshop, add water to form a raw material solution with a forage concentration of 15%-20%; add ultrasonic-assisted reinforcing additives with a raw material solution weight of 0.1%-1.0% Auxiliary reinforcement additives are mixed with dimethyl sulfoxide and polyethylene oxide in a weight ratio of 1:3-10. Turn on the reactor jacket oil heating device, and turn on the ultrasonic wave when the temperature of the forage rises to 90°C-140°C. Generator, the power of ultrasonic wave is 0.45-0.75 kW / cubic material, the frequency is 15-80KHZ, the ultrasonic wave acts on the wheat straw intermittently, and the reaction takes 2.5-4 hours; Open the discharge valve to make the slurry into a slurry quickly; after that, squeeze out the water and dissolved matter in the slurry through a squeezer, and then clean the slurry; finely grind the slurry through a high-consistency refiner,...

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Abstract

The invention discloses a process for integrating pulping and bleaching by using ultrasonic wave, which relates to the technical field of papermaking and pulping. The process comprises the following steps: adding water to raw materials to obtain a raw material liquid which has a concentration of 3%-30%, and adding an ultrasonic wave assistant enhanced additive which is 0.1%-1.0% of the raw material liquid weight; then heating the raw material liquid to 50 DEG C-180 DEG C and turning on an ultrasonic generator, wherein the ultrasonic power is 0.25-1 kilowatt per cubic meter of the raw materialliquid; the frequency is 15-80KHz; and the ultrasonic wave acts on the raw material liquid intermittently for 1-5 hours. With the action of ultrasonic wave, fiber and lignin in the raw material are separated to form bleached slurry; and carrying out processes such as selecting, purifying, solvent extracting and the like after discharging. The invention has the beneficial effects that: carrying out pulping and bleaching simultaneously; greatly decreasing the number of equipment and the energy consumption, saving investment and having lower production cost; obtaining high yield of paper pulp and bleaching efficiency and having good product quality; having less working sections of pulp washing and using less water; discharging less waste water and having lower chemical oxygen demand (COD) and chroma; not containing persistent toxic pollutants such as AOX and the like; and having smaller pollution load and being friendly to the environment.

Description

Technical field: [0001] The present invention relates to the technical field of papermaking and pulping, and further utilizes ultrasonic technology for pulping and bleaching, especially for making bleached pulp from non-wood materials such as wheat straw, rice straw, reed, sugar bagasse, corn stalks, bamboo, and cotton linters by using ultrasonic technology Methods. Background technique: [0002] In my country, the use of wheat straw, rice straw and other grasses to make paper still occupies an important position in the field of papermaking, which is conducive to making full use of straw resources and increasing farmers' income. The current traditional caustic soda or kraft pulping process route using straw as raw material consists of material preparation, cooking, pulp washing, bleaching, and pulp washing sections. That is: after a series of material preparation processes, the grass is put into the steamer, and alkaline drugs and other additives are added, reacted for a lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H17/55D21C9/10D21C3/22D21H17/14D21C9/00D21H17/66D21D5/02D21H17/53D21H11/12D21C9/02D21H17/09
Inventor 刘洁翟华敏孙剑辉
Owner FUJIAN QINGSHAN PAPER INDUSTRY CO LTD
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