Title of Invention

A PROCESS FOR PRODUCING PAPER GRADE PULP FROM COIR BIT FIBRES

Abstract This invention relates to a process for producing paper grade pulp from coir bit waste comprising of the step of subjecting coir bit waste in the form of fibres to the step of digestion in the presence of Sodium Hydroxide solution wherein the ratio of coir bit to liquor is 1: 12 to 1: 20 at a pressure and duration as herein described, at temperature of 100°C to 150°C, neutralizing the digested coir bit with Hydrochloric acid, washing the digested coir bit to flash out any residual acid or alkali, wherein step of cooking is avoided.
Full Text

FIELD OF INVENTION
This invention relates to a process for producing paper grade pulp from coir bit fibres.
BACKGROUND OF INVENTION
During pulping, cellulosic fibres must be
liberated from their encasing lignin matrix so that they can associate with one another, yielding strength in the
final product. This polymer separation can be accomplished by removal of lignin as in chemical pulps^
or by maintaining the lignin as in high yield mechanical pulps. During the bleaching process, natural coloring
materials are removed along with a part of lignin resulting in brightening of the pulp.
Paper grade pulp was hitherto produced from wood chips. A disadvantage associated with the known
process was that of shortage of wood chips. Yet another disadvantage is that of the high costs of wood chips,
which substantially contributed to the end cost of pulp. Yet another disadvantage is that the wood chips were
converted into wood shavings and then subjected to the step of cooking so as to cause an exposure of the
fibres. The cooked chips were then subjected to the step of digestion to produce pulp.

During the processing of coir materials, the
coir bit fibres are generated in huge quantities- These fibres having length between 1/4" to 1/2" do not find
use in the coir processing units and are thus regarded as waste. Furthermore, it is considered that only 257,
of coir is used in product application, the remainder constituting a waste* Still further, when the fibre is
extracted from the husk during the step of mechanical , the fibres tend to break, and a 1 so thereby
constituting a waste.
As described wastes consisting of coir bit fibres did not have any useful application except as a fuel .
OBJECTS OF THIS INVENTION
An object of this invention is to propose a process for producing paper grade pulp from coir bit fibres.
Another object of this invention is to propose a process for producing paper grade pulp from coir bit wastes but which has a quality as wood as that prepared from wood chips.
Stil1 another object of this invention is to propose a process for producing paper grade pulp from coir bit wastes which avoids the step of cooking as known with respect to wood chips.

Yet another object of this invention is to propose a process for producing paper grade pulp from coir bit wastes and whereby substantial quantities of coir bit waste can be employed.
DESCRIPTION OF THE INVENTION
According to this invention there is provided a process for producing paper grade pulp from coir bit waste comprising of the step of subjecting coir bit waste in the form of fibres to the step of digestion in the presence of Sodium Hydroxide solution wherein the ratio of coir bit to liquor is 1: 12 to 1: 20 at a pressure and duration as herein described, at temperature of neutralizing the digested coir bit with Hydrochloric acid, washing the digested coir bit to flash out any residual acid or alkali.
In accordance with this invention the coir bit waste is subjected to the step of digestion in the presence of sodium hydroxide having a concentration of 1 to 16%. Further, the ratio of the coir bit waste to liquor is 1:20, and preferably 1:14 to 1:17.
The digestion is carried out in the presence of pressure of 2 to 4 kg/cm Such a pressure firstly digestion temperature of digestion so that the digestion temperature is 100-150 . If the digestion temperature exceeds ISO then charring of the fibre occurs. A second advantage of the pressure is that is

acts on the cell wall and causes a rupture and thereby allows a quicker digestion.
Further objects and advantages of the present invention wil1 be more apparent from the ensuing example.
EXAMPLE 1
Digestion in cold was carried out by adding 4-16X of caustic soda on the weight of the material and
the liquor-ratio of Is 12 to ls20. The mixture was kept for 6 to 24 hours, washed thoroughly neutralized in
hydrochloric acid, again washed twice.





WE CLAIM:
1. A process for producing paper grade pulp from coir bit waste
comprising of the step of subjecting coir bit waste in the form of fibres
to the step of digestion in the presence of Sodium Hydroxide solution
wherein the ratio of coir bit to liquor is 1: 12 to 1: 20 at a pressure
and duration as herein described, at temperature of neutralizing the digested coir bit with Hydrochloric acid, washing the
digested coir bit to flash out any residual acid or alkali.
2. A process as claimed in claim 1 wherein the digestion is carried out in
the presence of pressure of 2 to 4 kg/cm
3. A process as claimed in claim 1 wherein the ratio of the coir bit fibres
to liquor is 1:14 to 1:17,
4. A process as claimed in claim 1 wherein sodium hydroxide has a
concentration of 1-16%.
5. A process for producing paper grade pulp from coir bit waste
substantially as herein described.


Documents:

064-mas-1999-abstract.pdf

064-mas-1999-claims filed.pdf

064-mas-1999-claims granted.pdf

064-mas-1999-correspondnece-others.pdf

064-mas-1999-correspondnece-po.pdf

064-mas-1999-description(complete)filed.pdf

064-mas-1999-description(complete)granted.pdf

064-mas-1999-form 1.pdf

064-mas-1999-form 19.pdf

064-mas-1999-form 26.pdf


Patent Number 210262
Indian Patent Application Number 64/MAS/1999
PG Journal Number 50/2007
Publication Date 14-Dec-2007
Grant Date 25-Sep-2007
Date of Filing 19-Jan-1999
Name of Patentee UMA SHANKAR SHARMA
Applicant Address CENTRAL COIR RESEARCH INSTITUTE (COIR BOARD), P.O KALAVOOR DIST , ALLEPPEY, PIN 688 522,
Inventors:
# Inventor's Name Inventor's Address
1 ANITA DAS RAVINDRANATH INDIAN NATIONALS OF CENTRAL COIR RESEARCH INSTITUTE (COIR BOARD), P.O KALAVOOR DIST , ALLEPPEY, PIN 688 522,
2 SUNIL DATH INDIAN NATIONALS OF CENTRAL COIR RESEARCH INSTITUTE (COIR BOARD), P.O KALAVOOR DIST , ALLEPPEY, PIN 688 522,
3 CHRISTY FERNANDEZ AN INDIAN OOF COIR BORD, COIR HOUSE, M.G.ROAD , COCHIN-682 016,
4 UMA SHANKAR SHARMA INDIAN NATIONALS OF CENTRAL COIR RESEARCH INSTITUTE (COIR BOARD) ,P.O KALAVOOR DIST , ALLEPPEY, PIN 688 522,
PCT International Classification Number D21B1/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA