CN100557122C

CN100557122C - Straw and grass activating agent pulping method

Info

Publication number: CN100557122C
Application number: CNB2007100122206A
Authority: CN
Inventors: 李文海
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-07-19
Filing date: 2007-07-19
Publication date: 2009-11-04
Anticipated expiration: 2027-07-19
Also published as: CN101100819A

Abstract

For solving the problems that existing rice wheat straw raw material pulping process exists, low as the pulping yield rate, intensity difference, quality is low, the paper pulp drainability is poor, be not easy to copy the paper manufacturing, pulping waste liquor, waste water is difficult to reclaim, contaminated environment etc., patent application of the present invention provides a kind of straw and grass activating agent pulping method, this method is a raw material with the rice wheat straw, add the boiling water, the 0.5-1% surfactant that adds rice wheat straw over dry gross weight, respectively the 7-8% by rice wheat straw over dry gross weight adds caustic alkali and soda ash respectively, boiling is 30 minutes to 90 minutes in boiling temperature, makes and easily floats paper pulp; Surfactant is wherein selected xylenesulfonate for use.The technological merit that the technical program has that paper pulp yield rate height, quality height, drainability are good, pulping waste liquor, waste water can all be recycled.

Description

Straw and grass activating agent pulping method

Technical field

What the present invention relates to is to be the technical field that main raw material carries out paper-making pulping with the paddy and wheat grass.

Background technology

Traditional is the raw pulp paper technology with the paddy and wheat grass, the technical problem underlying that exists is: the caustic alkali consumption is very big, account for the 14-16% of raw material weight, and in the process environments of high temperature, high pressure, carry out long chemical steaming, the common time that must need more than 3 hours, allow it be in all the time in the middle of the strong chemical reaction in during this, easily float paper pulp in the hope of making.In the middle of this, paper pulp fiber will bear excessive chemical steaming, must suffer that the chemical degradation of certain degree destroys, and causes slurrying yield rate and pulping intensity all very undesirable, and pulp quality is also very poor; The non-fiber organic matter that accounts for half weight of paddy and wheat grass can produce a large amount of hydrophily colloidal sol in high temperature, high pressure, high alkaline boiling, cause pulping waste liquor viscosity height, muddiness, not only be difficult to reclaim, pollution to environment is extremely serious, and cause the paper pulp drainability very poor, influenced paper machine the carrying out smoothly of operation of manufacturing paper with pulp greatly.Entangle its reason people usually unilateral think what the straw pulp self reason caused, think that its fiber is short, cause pulping intensity low; Its heteroproteose cell content height causes its drainability poor; Because of its silicone content height, ash are big, be the one of the main reasons that causes pulping waste liquor, waste water to reclaim difficulty, be difficult to pollution control.

Summary of the invention,

The goal of the invention of patent application of the present invention is to provide a kind of the realization under the process conditions that reduce the caustic alkali consumption to improve the pulping yield rate, obtain the high-quality straw and grass activating agent pulping method that easily floats paper pulp, and this method has also solved the technical problem that pulping waste liquor, waste water are recycled fully.The straw and grass activating agent pulping method of patent application of the present invention is: with the rice wheat straw is raw material, add the boiling water, the 0.5-1% surfactant that adds rice wheat straw over dry gross weight, respectively the 7-8% by rice wheat straw over dry gross weight adds caustic alkali and soda ash respectively, boiling is 30 minutes to 90 minutes in boiling temperature, makes and easily floats paper pulp; Surfactant is wherein selected xylenesulfonate for use.

In above-mentioned overall technical architecture, the surfactant of its interpolation also includes lignosulfonates and dodecyl benzene sulfonate, and the usage ratio of xylenesulfonate, lignosulfonates and dodecyl benzene sulfonate is 5: 4: 1.

With the rice wheat straw is that raw material carries out paper-making pulping, have that pulp quality is low, pulping intensity difference, paper pulp yield rate be undesirable, the paper pulp drainability is poor, be not easy to copy the paper manufacturing, many-sided technical problems such as pulping waste liquor, waste wash liquor are difficult to recycle, environmental pollution is very big, people generally believe that these problems all come from the nature of the every inadequate natural endowment of rice wheat straw, as fiber is short, heteroproteose cell is many, silicon content is high, grey deal is big, thereby form unilateral common recognition and above-mentioned technical problem will inevitably occur with the slurrying of rice wheat straw raw material, be difficult to effective solution from the technology angle.

The straw and grass activating agent pulping method of patent application of the present invention, broken through traditional mindset, changed traditional technological design scheme, add the surfactant that molecular structure is similar to, also acts on lignin specially, make cooking liquor selectively with lignin reaction, with its decomposition, make it to be dissolved in waste liquid, the waste water, with its removing, break away from fiber.In this process owing to do not destroy fiber and half fiber composition in the raw material, protected fibrous, thereby improved yield rate, also made the bleachable pulp material of high-quality; And its caustic alkali consumption also reduces thereupon greatly, but obtained the technique effect of slurrying yield rate height, pulp quality excellence.Traditional rice and wheat straw pulping method, its yield rate has only 35-40%, and this manufacture method slurrying yield rate can be brought up to 45-50%, seldom has heteroproteose cell to occur in slurry, has guaranteed the slurry drainability, and it becomes the pulp brightness height; Its pulping intensity height, the fracture length index is up to more than the 5200M, exceed more than 70% than traditional 3000M, other comprise folding, anti-ly tear, anti-broken equal strength also all significantly improve, paper pulp glossiness, smoothness and opacity all increase, its paper pulp can be widely used in produces newsprint and productions such as high strength paper plate such as other cultural printing paper and handbag, and need not to add chemical wood pulp.Owing to adopt the process of the technical program, its waste liquid, in the waste water, fiber destruction product content significantly reduces, thereby help, also be easy to pulping waste liquor, waste water carries out environment-friendly type and recycles, in the technical program, its waste liquid and waste wash liquor carry out sulfonation to be handled, can realize lignin precipitation purification production, contain lignin sulfonate surfactant in the lignin supernatant of solubility, it is circulated as the pulping and digesting medication, thereby saving dosing, can also use as the adverse current pulp washing, remove the residual lignin in the slurry, can improve the pulp washing whiteness more than 10%, realized pulping waste liquor, the green technology purpose of the recycling of waste wash liquor.

The specific embodiment

To describe the disclosed straw and grass activating agent pulping method of present patent application below in detail.Its a kind of embodiment is: the rice and wheat straw pulping process adds the boiling water of respective amount in the rice wheat straw routinely, its water yield is 3 to 6 times of rice wheat straw oven dry weight normally, 7-8% by rice wheat straw over dry gross weight adds caustic alkali and soda ash respectively, the 0.5-1% surfactant that adds rice wheat straw over dry gross weight, its surfactant of selecting for use is an xylenesulfonate, the composite pulping medicament of proportionaling alkali-forming and surfactant, at 115 ℃, error boiling 90 minutes under ± 5 ℃ boiling temperature, or at 160 ℃, error boiling 30 minutes under ± 5 ℃ boiling temperature makes and easily floats paper pulp.Since xylenesulfonate have with the rice wheat straw raw material in the akin molecular structure of lignin---benzene nucleus, and be different from the molecular structure of fiber and half fiber, it has good penetration, diffusivity and surface-activity to rice wheat straw raw material lignin, impel pulp liquor to directly act on the lignin composition of rice wheat straw raw material, with its decomposition, be dissolved in the middle of pulping waste liquor, the waste wash liquor.

For improving and strengthen infiltration to the lignin in the rice wheat straw raw material, dissolution, further guarantee pulp quality with and yield rate, another embodiment of present technique is: the rice and wheat straw pulping process adds the boiling water of respective amount in the rice wheat straw equally routinely, its water yield is 3 to 6 times of rice wheat straw oven dry weight normally, ratio in the 7-8% of rice wheat straw over dry gross weight adds caustic alkali and soda ash respectively, the 0.5-1% surfactant that adds rice wheat straw over dry gross weight, wherein selected surfactant is an xylenesulfonate, lignosulfonates and dodecyl benzene sulfonate, its proportioning is 5: 4: 1, the composite pulping medicament of proportionaling alkali-forming and surfactant, at 115 ℃, error boiling 90 minutes under ± 5 ℃ boiling temperature, or at 160 ℃, error boiling 30 minutes under ± 5 ℃ boiling temperature makes and easily floats paper pulp.Because xylenesulfonate, lignosulfonates and dodecyl benzene sulfonate, have with the rice wheat straw raw material in the akin molecular structure of lignin---benzene nucleus, lignosulfonates particularly, these three kinds of surfactants are being brought into play advantage separately: permeability, the advantage that diffusivity and foam volume are many, lignin in the rice wheat straw raw material had good penetration, diffusivity and surface-activity, and improve the operation pressure in airtight slurrying space greatly, impel pulp liquor more direct, effective function is in the lignin composition of rice wheat straw raw material, with its decomposition, be dissolved in waste liquid, in the middle of the waste water.

In each above-mentioned embodiment, the consumption of its surfactant is 0.5-1%, and its consumption was less than 0.5% o'clock, and the lignin cleaning effect is poor, causes paper pulp hard, influences paper machine and copies paper, and its papermaking is of poor quality; Its consumption was greater than 1% o'clock, and the effect of its stripping lignin and not obvious raising consider that for two aspect optimizations of cost and technique effect its upper limit is set at 1%.

Claims

1, a kind of straw and grass activating agent pulping method, it is characterized in that this method is: with the rice wheat straw is raw material, add the boiling water, the 0.5-1% surfactant that adds rice wheat straw over dry gross weight, respectively the 7-8% by rice wheat straw over dry gross weight adds caustic alkali and soda ash respectively, boiling is 30 minutes to 90 minutes in boiling temperature, makes and easily floats paper pulp; Surfactant is wherein selected xylenesulfonate for use.

2, pulping process according to claim 1 is characterized in that its surfactant also includes lignosulfonates and dodecyl benzene sulfonate, and the usage ratio of xylenesulfonate, lignosulfonates and dodecyl benzene sulfonate is 5: 4: 1.