Wet catalytic oxidation clean pulping process and equipment for implementing same

A wet catalytic oxidation and clean pulping technology, which is applied in cellulose raw material pulping, pulp bleaching, non-fibrous pulp addition, etc., can solve the problems of high pulping cost and large consumption of hydrogen peroxide, and achieve controllability of the reaction. Strong, mild oxidation conditions, simple process effect

Active Publication Date: 2010-12-29
BEIJING XIQIAO SOLAR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The patent application "Pollution-free Pulping Method and Pulp Produced (Application No. 200810157414.X)" discloses a pollution-free pulping method and produced pulp using hydrogen pero

Method used

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  • Wet catalytic oxidation clean pulping process and equipment for implementing same

Examples

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Effect test

Embodiment 1

[0048] Raw material: wheat straw

[0049] After the raw materials are cut and cleaned in the washing tank, they are put into the soaking tank of the pretreatment agent and soaked for 1 hour. The pretreatment agent is a mixed solution of 15% NaOH solution and 5% EDTA aqueous solution in a weight ratio of 1:1. Then pre-grind the soaked raw materials. The pre-ground raw materials are fully dispersed in water 6 times the weight of the raw materials. After being heated by a heat exchanger, they are put into a wet catalytic oxidation reactor made of titanium alloy steel. The heating sleeve is heated up so that the temperature in the kettle reaches 200°C; the catalyst, oxygen stabilizer and additives are added through the feeding port of the reactor; the diameter of the catalyst carrier is 60mm porous ceramics, and the catalyst is 80% of the surface of the carrier sintered at a high temperature (mass percentage) of copper oxide and 20% (mass percentage) of manganese oxide; the oxygen...

Embodiment 2

[0051] Raw material: cotton stalk

[0052] After the raw materials are cut and cleaned in the washing tank, they are put into the soaking tank of the pretreatment agent and soaked for 2 hours. The pretreatment agent is a mixed solution of 20% NaOH solution and 6% EDTA aqueous solution in a weight ratio of 1:1. Then pre-grind the soaked raw materials. The pre-ground raw materials are fully dispersed in water 5 times the weight of the raw materials. After being heated by a heat exchanger, they are put into a wet catalytic oxidation reactor made of titanium alloy steel. The heating sleeve is heated up so that the temperature in the kettle reaches 240°C; the catalyst, oxygen stabilizer and additive are added through the feeding port of the reactor; the diameter of the catalyst carrier is 80mm porous ceramics, and the catalyst is 85% (mass) of the surface of the carrier sintered at a high temperature. percentage) of copper oxide and 15% (mass percentage) of manganese oxide; the oxy...

Embodiment 3

[0054] Raw material: reed

[0055] After the raw materials are cut and cleaned in the washing tank, they are put into the soaking tank of the pretreatment agent and soaked for 1.5 hours. The pretreatment agent is a mixed solution of 15% NaOH solution and 5% EDTA aqueous solution in a weight ratio of 1:1. Then pre-grind the soaked raw materials. The pre-ground raw materials are fully dispersed in water 5 times the weight of the raw materials. After being heated by a heat exchanger, they are put into a wet catalytic oxidation reactor made of titanium alloy steel. The heating sleeve is heated up so that the temperature in the still reaches 220°C; the catalyst, oxygen stabilizer and additives are added through the feeding port of the reaction kettle; the diameter of the catalyst carrier is 60mm porous ceramics, and the catalyst is 80% of the surface of the carrier sintered at a high temperature (mass percentage) of copper oxide and 20% (mass percentage) of manganese oxide; the oxy...

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Abstract

The invention discloses a clean pulping process for preparing paper pulp by using a wet catalytic oxidation reaction and equipment for implementing the same. The clean pulping process and the equipment are characterized in that: in a wet catalytic oxidation reaction kettle at a certain temperature and under certain pressure, introduced oxygen continuously generates a great number of active groups with strong oxidation, such as hydroxyl radicals (HO) and the like, in a water body by initiation of a catalyst; and the active groups have excellent capabilities of removing lignin and decomposing chromophore and can carry out lignin removal and bleaching treatment on various raw materials which are subjected to previous pretreatment, such as cotton stalks, wheat straw and wood, to finally obtain the paper pulp. The pulping process and the equipment have the most obvious characteristics of simple process, high yield of the paper pulp, low CODCr value of generated waste water, capability of eliminating the use of a mass of chemicals such as acid, alkali, sulphur, chlorine, anthraquinone and the like and serious pollution on the environment caused by a mass of paper-making black liquor in the conventional paper pulp making industry from source and clean and efficient novel pulping process.

Description

technical field [0001] The invention relates to the technical field of clean pulping, and relates to a clean pulping process and implementing equipment for delignification and bleaching using wet catalytic oxidation technology. Background technique [0002] At present, the main problems faced by my country's paper industry are the shortage of raw materials, serious pollution and backward technology. The traditional papermaking process is mainly composed of material cutting, screening, cooking, washing, bleaching and other processes. A large amount of strong acid, strong alkali and chlorine-containing reagents are used. If it is not properly treated, it will seriously affect the natural environment on which human beings depend. At present, the alkali recovery method commonly used in paper mills to treat papermaking black liquor has remarkable results, but the investment is huge and the treatment cost remains high. Excessive discharge of waste water from enterprises is so com...

Claims

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Application Information

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IPC IPC(8): D21C3/22D21C9/147D21C9/16D21C1/06D21H21/14
Inventor 陈国泰王高升卢华权
Owner BEIJING XIQIAO SOLAR TECH
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