CN104652160A

CN104652160A - Self-coupling oxygen ion fast bleaching untwining pulping method

Info

Publication number: CN104652160A
Application number: CN201310596660.6A
Authority: CN
Inventors: 李朝旺
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-11-25
Filing date: 2013-11-25
Publication date: 2015-05-27

Abstract

The invention relates to a self-coupling oxygen ion fast bleaching untwining pulping method. The main technical characteristics includes: conveying plant fiber subjected to crushing, separating, screening and impurity removal into a fiber high efficiency untwining screening machine, then injecting hydrogen peroxide (4-6%, the ratio to an absolute dry raw material) and steam, making the temperature inside the machine reach 80-90DEG C, mixing the hydrogen peroxide and fiber evenly through rapid rotation of a stirrer in the machine, under ultraviolet excitation, making the hydrogen peroxide rapidly decompose into nucleophilic active oxygen ions (02-) to react with fiber lignin chromophoric groups, and changing chromophoric groups into colorless groups in 3-5min, making the fiber pulp whiteness become 75-85%ISO, further carrying out softening and untwining for 30min, and conducting screening to make the qualified pulp enter the next process.

Description

Pulp-making method is discongested from even oxonium ion rapid bleach

Technical field

The present invention is the clean environment firendly pulp-making method adopting string pulping and paper-making, is a pioneering invention of paper-making industry.

Background technology

Adopt rice wheat straw, cotton stalk, mulberry shoot, brush wood to make bleached pulp papermaking, its key link has be rapid bleach at two: one; Two is efficiently discongest.Tradition pulping bleaching slurry per ton needs use 300 kilograms of caustic soda, 180 degree of temperature boilings 4 hours, calcium hypochlorite bleaching is adopted after cleaning for many times again, therefore, bleached pulp per ton need with 600 tons of clear water, COD content 160000MG/L in black liquor of pulp making, cause ecological environment severe contamination, " dioxin " that especially chlorine bleach generates has extremely strong injury to human body.In whole pulping process, need to use mill more than times defibrinations, both wastes of manpower, electric power, make again fiber be damaged, and falls low-fiber every physical index.At present, occur two kinds of new technologies: although one can decreasing pollution, dosage is large, cause fibre damage large, cost is high, is difficult to promote; It two is " self coupled oxidation cleaning pulp making technique ", although can pollution be effected a radical cure, cost is also low, but technological process is long, equipment is complicated, power consumption is large, the present invention is intended to overcome above-mentioned defect, adopt high-efficiency fiber bleaching screening machine, use ultraviolet excitation hydrogen peroxide to produce nucleophilic reactivity oxonium ion, with the chromophoric group chain-react in lignin, abolish the chromophoric group of lignin, soften simultaneously, discongest fibrous raw material, by fiber bleached, soften, discongest, screen, become slurry process once to complete, water-saving and electricity-saving is economized on coal cost-saving.

Summary of the invention

The object of the invention is the above-mentioned defect overcoming prior art, after fibrous raw material is pulverized sub-wire, be transported to fibre with high-efficiency to discongest in screening machine (200810126790.2) and be uniformly mixed with hydrogen peroxide, under ultraviolet excitation, make hydrogen peroxide generate extremely strong nucleophilic reactivity oxonium ion (the 02-oxidizing potential 2.8 of oxidizing potential, higher than ozone 1.7), the quick target of this active oxygen ion abolishes the chromophoric group in lignin, make the hydroxyl in raw material simultaneously, carbonyl, methoxyl group chain-react, the molecular structure of self is changed voluntarily by the oxidizing potential that oxonium ion is extremely strong, change chromophoric group is colourless group, make fiber softening discongest simultaneously, bleaching, discongest, screening time only needs 5-30 minute.This invention avoid the black liquor produced with alkaline boiling, " dioxin " that produce with chlorine bleach, make that bleached pulp water per ton reduces to 3 tons, electricity consumption reduces to 200 degree, reduces to 0.2 ton with coal.

Detailed description of the invention:

Whole-cotton stalk carries out discongesting slurrying from even oxonium ion rapid bleach by Beijing self coupled oxidation cleaning pulp making technique demonstration plant in the following way:

1, discongest being transported to fibre with high-efficiency after cotton stalk (gross weight band stalk) pulverizing, sub-wire, screening, removal of impurities in screening machine.

2, hydrogen peroxide is injected fibre with high-efficiency by 4-6% (with over dry raw material ratio) and discongest screening machine, agitator fast rotational is utilized to be mixed with raw material by hydrogen peroxide, pass into steam simultaneously, make efficiently to discongest temperature in screening machine and reach 80-90 degree, pulp-water is advisable than for 1:8-10.

3, discongest the exciting of screening machine medium ultraviolet light (built-in ultraviolet tube) at fibre with high-efficiency under, hydrogen peroxide is decomposed into rapidly nucleophilic reactivity oxonium ion (02-), through 3-5 minute with the lignin chromophoric group chain-react in fiber, lignin chromophoric group in fiber is become colorless group, and fibre whiteness reaches 75-85%ISO.

4, fiber continues to soften, discongest efficiently discongesting in screening machine, makes accepted stock enter next process through screening, and defective slurry continues to soften, discongest and reach qualified.Whole bleaching, discongest, screening process 30 minutes.

Claims

1. discongesting pulp-making method technical characteristics from even oxonium ion rapid bleach is process pulverized, sub-wire, screening, the string of removal of impurities is transported to fibre with high-efficiency and discongests in screening machine, inject hydrogen peroxide (4-6% simultaneously, with over dry raw material ratio) and steam, make efficiently to discongest temperature in screening machine and reach 80-90 degree, under agitator fast rotational hydrogen peroxide and fibers mixture even, in machine under ultraviolet excitation, hydrogen peroxide is decomposed into rapidly nucleophilic reactivity oxonium ion (O2-) and reacts with the chromophoric group in lignin, fibre whiteness was made to reach 75-85%ISO at 3-5 minute, continue softening, discongest and accepted stock was screened next process in 30 minutes.