WO2015083903A1

WO2015083903A1 - Method for manufacturing pulp using palm sludge

Info

Publication number: WO2015083903A1
Application number: PCT/KR2014/002731
Authority: WO
Inventors: 차완영
Original assignee: (주)스카이글로벌
Priority date: 2013-12-03
Filing date: 2014-03-31
Publication date: 2015-06-11
Also published as: MY173169A; KR20150064626A

Abstract

The present invention relates to a method for manufacturing pulp using palm sludge. More specifically, the method comprises: a raw material mixing step for mixing palm sludge powder and wood chips; a nitrocarburizing step for mixing the mixture manufactured through the raw material mixing step and a sodium hydroxide aqueous solution and heating the same; a first washing step for washing the mixture nitrocarburized through the nitrocarburizing step; a first drying step for drying the mixture washed through the first washing step; a cleaning step for cleaning the mixture dried through the first drying step; a second drying step for drying the mixture cleaned through the cleaning step; a bleaching step for adjusting the whiteness index of the mixture dried through the second drying step; a second washing step for washing the mixture bleached through the bleaching step; and a third drying step for drying the mixture washed through the second washing step. In the pulp manufacturing method comprising the aforementioned processes, raw material obtained by mixing palm sludge powder and wood chips is used, thereby reducing manufacturing time and cost for pulp and providing pulp having excellent physical properties and various whiteness indices.

Description

Method for producing pulp using palm sludge

The present invention relates to a method for producing pulp using palm sludge, and more particularly, palm sludge is used to reduce pulp production time and manufacturing cost, and to provide pulp of palm sludge that provides pulp with excellent physical properties and various whiteness. It relates to a manufacturing method.

The process of obtaining fibers from wood or non-wood materials is called the pulping process, and the pulping process can be divided into mechanical and chemical methods.

First of all, the mechanical method is to break down the complex intercellular layer of pulp raw material with a wood mill, or soften it with water vapor, and then break it down with mechanical force to obtain fibers. The obtained pulp is called mechanical pulp, and mechanical pulp has a high yield and a low production cost, but has a disadvantage of being unsuitable as a raw material of high-quality paper due to its high content of non-fibers such as lignin and hemicellulose.

On the other hand, the chemical method consists of dissolving the complex intercellular layer in fibrous form by treating the pulp raw material with ligignin chemical, and the pulp produced through the chemical treatment is called chemical pulp. Methods include sulfurous acid method, soda method, sulfate method and the like, in the case of chemical pulp, the intercellular lignin and hemi cellulose of the raw material is removed during the manufacturing process has the advantage of high cellulose purity.

However, the sulfurous acid method of the above method has the advantage of making a good quality paper or dissolved pulps with high purity of cellulose, but has the disadvantage that the recovery of the waste liquor is difficult to recycle and the caustic soda method is a long time in the cooking process. This takes, and has the disadvantage of low efficiency.

On the other hand, the technology of manufacturing pulp using wood as a raw material is a high price of the wood chip, it takes a lot of time to soften the wood chip manufacturing cost is expensive, there is a problem that the efficiency of the manufacturing process is lowered.

It is an object of the present invention to provide a method for producing pulp using palm sludge, which is low in manufacturing cost and short in nitriding time due to the use of a raw material mixed with palm sludge powder and wood chips.

Another object of the present invention is to use a raw material mixed with palm sludge powder and wood chips, showing excellent physical properties, and freely control the concentration of the bleaching agent to produce pulp using palm sludge which can produce pulp having various whiteness To provide.

An object of the present invention is a raw material mixing step of mixing the palm sludge powder and wood chips, the soft nitriding step of mixing and heating the mixture prepared by the raw material mixing step with an aqueous sodium hydroxide solution, the soft nitriding mixture through the soft nitriding step The first washing step of washing, the first drying step of drying the mixture washed through the first washing step, the selection step of selecting the mixture dried through the first drying step, the mixture selected through the selection step The second drying step of drying, the bleaching step of adjusting the whiteness of the mixture dried through the second drying step, the second washing step of washing the mixture bleached through the bleaching step and the second washing step It is achieved by providing a method for producing pulp using palm sludge, characterized in that through the third drying step of drying the mixed mixture.

According to a preferred feature of the invention, the raw material mixing step is to be made by mixing 75 to 85 parts by weight of wood chips to 100 parts by weight of palm sludge powder.

According to a more preferred feature of the present invention, the palm sludge powder is to be prepared by grinding to have a particle size of 0.01 to 0.05 millimeters after drying the palm sludge.

According to a more preferred feature of the invention, the soft-nitriding step is mixed with 10 to 15 parts by weight of sodium hydroxide to 100 parts by weight of the mixture prepared through the raw material mixing step and heated to a temperature of 170 to 190 ℃ for 350 to 400 minutes Shall be made.

According to a further preferred feature of the invention, the bleaching step is to be made by impregnating the mixture dried through the drying step in the bleach for 3 to 6 hours.

According to a further preferred feature of the invention, the bleaching agent is to be made by mixing 1 to 20 parts by weight of the acid component consisting of sulfuric acid or lactic acid to 100 parts by weight of purified water.

Since the method for producing pulp using palm sludge according to the present invention uses a raw material in which palm sludge powder and wood chips are mixed, the production cost is low and the soft nitriding time is shortened, thereby providing an excellent effect of providing pulp in a short time. .

In addition, it exhibits excellent physical properties and free control of the concentration of the bleaching agent, thus providing an excellent effect of providing pulp with varying whiteness.

1 is a flow chart showing a method for producing pulp using palm sludge according to the present invention.

** Description of the symbols for the main parts of the drawings **

S101; Raw material mixing step

S103; Soft Nitriding Step

S105; 1st washing stage

S107; First drying stage

S109; Selection stage

S111; Second drying stage

S113; Bleaching stage

S115; 2nd washing stage

S117; 3rd drying stage

In the following, preferred embodiments of the present invention and the physical properties of each component will be described in detail, which is intended to explain in detail enough to be able to easily carry out the invention by one of ordinary skill in the art, This does not mean that the technical spirit and scope of the present invention is limited.

In the method for producing pulp using palm sludge according to the present invention, a raw material mixing step of mixing palm sludge powder and wood chips (S101) and mixing and heating the mixture prepared through the raw material mixing step (S101) with aqueous sodium hydroxide solution First drying step (S105), the first washing step (S105) for washing the softened mixture through the soft nitriding step (S103), drying the washed mixture through the first washing step (S105) Step (S107), the selection step of selecting the mixture dried through the first drying step (S107) (S109), the second drying step (S111), drying the mixture selected through the selection step (S109), the Bleaching step (S113) of controlling the whiteness of the mixture dried through the second drying step (S111), the second washing step (S115) and the second washing step of washing the mixture bleached through the bleaching step (S113) The third drying step (S117) for drying the washed mixture through (S115) It made it.

The raw material mixing step (S101) is a step of mixing the palm sludge powder and wood chips, made by mixing 75 to 85 parts by weight of wood chips to 100 parts by weight of palm sludge powder, the raw material containing palm sludge powder is only wood chips Not only is the price lower than that of the raw material, and the time of soft nitriding in the soft nitriding step (S103) is shortened, thereby reducing the manufacturing cost.

If the content of the wood chip is less than 75 parts by weight, the mechanical properties of the pulp is lowered, if the content of the wood chip exceeds 85 parts by weight, the manufacturing cost increases and the soft nitriding time is increased in the soft nitriding step .

The palm sludge powder is prepared by pulverizing the palm sludge to have a particle size of 0.01 to 0.05 millimeter, and the water is removed through the drying process and the palm sludge powder finely pulverized as described above provides a soft pulp. It plays a role.

The soft nitriding step (S103) is a step of mixing and heating the mixture prepared through the raw material mixing step (S101) with an aqueous sodium hydroxide solution, and sodium hydroxide in 100 parts by weight of the mixture prepared through the raw material mixing step (S101). 10 to 15 parts by weight of the aqueous solution is mixed and heated to a temperature of 170 to 190 ℃ for 350 to 400 minutes.

In the soft nitriding step (S103), the soft nitriding time is reduced by about 50% compared to the case of using only the raw material consisting of wood chips, thereby shortening the manufacturing time, thereby reducing the manufacturing cost.

In addition, when the softening proceeds through the above process, the lignin that binds the fibers contained in the wood chips and palm sludge powder is separated, thereby softening the mixture consisting of wood chips and palm sludge powder.

At this time, it is preferable to use the mass concentration of the sodium hydroxide aqueous solution is 5 to 25%, if the mass concentration of the sodium hydroxide aqueous solution is less than 5%, soft nitriding proceeds slowly to decrease the efficiency of the work process, the sodium hydroxide If the mass concentration of the aqueous solution exceeds 25% will increase the manufacturing cost.

The first washing step (S105) is a step of washing the softened mixture through the soft nitriding step (S103), by washing the softened mixture through purified water (S103) 3 to 5 times with purified water In this first washing step (S105), the sodium hydroxide solution component contained in the softened mixture in the soft nitriding step (S103) is removed.

The first drying step (S107) is a step of drying the mixture washed through the first washing step (S105), it is made by putting the mixture washed through the first washing step (S105) into a dryer and dried. Preferably, it is more preferably made for 30 to 90 minutes at a temperature of 80 to 90 ℃ using a steam dryer.

The selection step (S109) is a step of selecting the mixture dried through the first drying step (S107), through this selection step (S109), not only the fiber strands are effectively separated, but also the first drying In the step S107, wood chips not softened and the like are removed from the wood chips contained in the dried mixture.

At this time, the selection step (S109) is not particularly limited as long as the selection device used in the pulp manufacturing field, any one may be used.

The second drying step (S111) is a step of drying the mixture selected through the selection step (S109), it is preferable to put the mixture selected through the selection step (S109) to a dryer and dry, steam More preferably, the dryer is used for 30 to 90 minutes at a temperature of 80 to 90 ° C.

The bleaching step (S113) is a step of adjusting the whiteness of the mixture dried through the second drying step (S111), the mixture bleached through the second drying step (S111) for 3 to 6 hours It is done by

In the bleaching step S113, the whiteness of the mixture dried through the second drying step S111 may be adjusted to 50 to 95%. As described above, the whiteness of the mixture depends on the impregnation time and the concentration of the bleaching agent. .

The bleach used in the bleaching step (S113) is made by mixing 1 to 20 parts by weight of an acid component consisting of sulfuric acid or lactic acid with 100 parts by weight of purified water, an impregnation time of 3 hours, and a content of the acid component of 1 part by weight of a bleaching agent. When the whiteness of the mixture is about 50%, the impregnation time is 6 hours, and when the bleach with 20 parts by weight of the acid content is used, the mixture is about 95% whiteness.

The second washing step (S115) is a step of washing the mixture bleached through the bleaching step (S113), by washing the mixture of whiteness adjusted through the bleaching step (S113) 3 to 5 times with purified water. Through the second washing step S115, the bleach component applied to the mixture is removed through the bleaching step.

The third drying step (S117) is a step of drying the mixture washed through the second washing step (S115), it is made by putting the mixture washed through the second washing step (S115) into a dryer and dried. Preferably, it is more preferably made for 30 to 90 minutes at a temperature of 80 to 90 ℃ using a steam dryer.

Hereinafter, the physical properties of the pulp produced by the method and the pulp produced using the palm sludge according to the present invention will be described with reference to Examples.

A mixture was prepared by mixing 100 parts by weight of palm sludge powder having a particle diameter of 0.03 millimeter and 80 parts by weight of wood chips, and 12 parts by weight of an aqueous sodium hydroxide solution (mass concentration of 15%) was mixed with 100 parts by weight of the mixture, at a temperature of 180 ° C. Heated and softened for 360 minutes, the softened mixture was washed four times with purified water to remove the sodium hydroxide solution component contained in the mixture, and the mixture, in which the sodium hydroxide aqueous solution was removed, was put into a steam dryer at a temperature of 85 ° C. The mixture was heated for 60 minutes and dried, and the dried mixture was put into a sorting apparatus for selection. The dried mixture was put into a steam dryer and heated at a temperature of 85 ° C. for 60 minutes to dry, and the dried mixture was bleached (purified water 100 Parts by weight and 10 parts by weight of lactic acid) for 5 hours to bleach, and wash the bleached mixture four times with purified water to remove the bleach contained in the mixture. And heated for 60 minutes at a temperature of 85 ℃ to bleach is added to the mixture to remove the steam dryer to prepare a pulp sludge with farm.

The physical properties of the pulp using the palm sludge prepared in Example 1 was measured and shown in Table 1 below.

(However, Brating degree, Density, Breaking Length, Tensile index, tear index, bursting index, TEA index and elongation can be determined by the Canadian Standard Freeness (CSF) test method of KS M ISO 5267-2. The density was confirmed by measuring the density of the pulp using JVC Digital Camera KY-F70B and measuring the density per unit area using the software of Image-Pro Plus.)

Table 1

division	Result
Beating Degree (° SR)	43
Density (g / cm ² )	0.5
Breaking Length (Km)	3.7
Tensile index (Nm / g)	36
Tear index (mN.m ² / g)	7.5
Bursting index (KPa.m ² / g)	2.8
TEA Index (J / g)	One
Elongation (%)	3.6

As shown in Table 1 above, it can be seen that the pulp using the palm sludge prepared in Example 1 of the present invention exhibits excellent physical properties.

In addition, since the raw material mixed with palm sludge powder and wood chips is used, the manufacturing cost is low and the soft nitriding time is shortened, so that it can be manufactured in a short time, and the concentration of bleach is freely controlled to provide pulp having various whiteness. can do.

The present invention can be used in the manufacture of pulp because the production cost is low, and the soft nitriding time is reduced by using a raw material mixed with palm sludge powder and wood chips.

Claims

Raw material mixing step of mixing the palm sludge powder and wood chips;

A soft nitriding step of mixing and heating the mixture prepared through the raw material mixing step with an aqueous sodium hydroxide solution;

A first washing step of washing the softened mixture through the soft nitriding step;

A first drying step of drying the washed mixture through the first washing step;

A selection step of selecting the mixture dried through the first drying step;

A second drying step of drying the mixture selected through the selection step;

A bleaching step of adjusting the whiteness of the mixture dried through the second drying step;

A second washing step of washing the mixture bleached through the bleaching step; And

And a third drying step of drying the mixture washed through the second washing step.
The method according to claim 1,

The raw material mixing step is a method for producing pulp using palm sludge, characterized in that by mixing 75 to 85 parts by weight of wood chips to 100 parts by weight of palm sludge powder.
The method according to claim 1 or 2,

The method of claim 1, wherein the palm sludge powder is milled to have a particle size of 0.01 to 0.05 millimeters after drying the palm sludge.
The method according to claim 1,

The soft nitridation step is mixed with 10 to 15 parts by weight of an aqueous sodium hydroxide solution to 100 parts by weight of the mixture prepared by the raw material mixing step and the palm sludge, characterized in that by heating for 350 to 400 minutes at a temperature of 170 to 190 ℃ Method for producing pulp used.
The method according to claim 1,

The bleaching step is a method for producing pulp using palm sludge, characterized in that the bleach is impregnated with the mixture dried through the drying step for 3 to 6 hours.
The method according to claim 5,

The bleach is a method for producing pulp using palm sludge, characterized in that by mixing 1 to 20 parts by weight of the acid component consisting of sulfuric acid or lactic acid to 100 parts by weight of purified water.