JPH0860571A - Production of pulp from date palm - Google Patents

Abstract

PURPOSE: To produce pulp suitable for paper making and other uses from date palm growing gregariously in the Middle and Near East. CONSTITUTION: Leaf parts of date palm crushed to small pieces are put in an autoclave, mixed with 10% of caustic soda, 0.05-0.1% of an anthraquinone and preferably 0.1 normal (normal concentration) sulfuric acid and digested at <100 deg.C for about 60 minutes. The digested date palm is filtered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing pulp suitable for papermaking and other uses from date palms growing in the Middle East.

[0002]

2. Description of the Related Art Recently, from the standpoint of protecting the global environment, protection of forest resources has become a major problem worldwide, and securing raw wood, which is a raw material for pulp for papermaking, has become difficult. Therefore, various non-wood pulp alternatives to wood pulp have been developed. However, even in the case of non-timber, it does not cost anything to procure materials, does not complicate the production process,
It must meet the requirements of good yield, no risk of pollution, and no deterioration of product quality.

[0003]

The inventor of the present application witnessing such a situation, and witnessed that dead leaves of date palm were incinerated and discarded in the desert in Arabia. Focusing on the fact that it is too large, I came up with the idea of using it for pulp production. However, dates fibers are long, hard, and difficult to melt, and thus it is difficult to immediately apply them to pulp production.

[0004]

The present invention has been made to solve such problems inherent to date palms. According to the present invention, dried date palm leaf portions (hereinafter referred to as "materials") are crushed. Into small pieces, put in an autoclave, add 10% potable soda, 0.05 to 0.1% anthraquinones, and preferably at least sulfuric acid.
10 minutes for about 60 minutes after adding 0.1 normal (specified concentration)
It is characterized in that pulp is obtained by digesting at a temperature not exceeding 0 ° C. and filtering the digested material.

[0005]

Example A dried leaf of a date palm (material) is collected and crushed by a suitable method into pieces. The dates of the date palms are large, with a total length of 3 meters or less,
In particular, since the trunk portion is hard, it cannot be cut into pieces by a usual cutting method. Therefore, it is appropriate to crush it into small pieces.

[0006] The shredded material is placed in an autoclave, preferably a rotary autoclave, to which 10% of fugitive soda and 0.05 to 0.1% of anthraquinones are added, and preferably, 0.1 normal sulfuric acid (specified (Concentration). In this state, about 10 minutes to prevent boiling of water, 10
It is cooked at a temperature not exceeding 0 ° C, preferably 70 ° C to 90 ° C. The digested material is filtered to recover the fiber portion.

The addition of sulfuric acid is effective in neutralizing the alkaline component contained in the mesophyll portion.

[0008]

The yield obtained under the above conditions is 59.7%.
Met. The yield fluctuates depending on the amount of caustic soda added, as shown in the figure, but it is more advantageous than the yield of conventional wood where the upper limit does not exceed 50%.

Since the present invention utilizes date palms that are originally incinerated and discarded, there is no cost for material procurement and no complicated production process. As described above, the yield is higher than that of conventional wood, and since it is a natural material, there is no fear of pollution due to air pollution, etc., and it does not contradict the global theme of forest resource protection.
Since the tough fibrous material unique to date palm can be used, the quality of the paper does not deteriorate when used in papermaking. Thanks to the tough fibrous material, a slab that can also be used as a building material can be obtained by laminating a plurality of carded pieces so that the flow of fibers is perpendicular to each other.

[Brief description of drawings]

FIG. 1 is a graph showing a comparison of the yield between the method of the present invention and a conventional method for producing pulp from wood.

Claims (2)

[Claims] 1. Putting the shredded date palm leaves into an autoclave, adding 10% alkaline solution and at least 0.05% anthraquinones, and then cooking for about 60 minutes at a temperature not exceeding 100 ° C. A method for producing pulp by using date palm. 2. The method for producing pulp from date palm according to claim 1, wherein the alkaline liquid is 10% of potable soda, and 0.1 normal of sulfuric acid (normal concentration) is further added.