Indian Patents. 210265:A PROCESS FOR PRODUCING RAYON GRADE PULP FROM COIR BIT FIBRES

Title of Invention	A PROCESS FOR PRODUCING RAYON GRADE PULP FROM COIR BIT FIBRES
Abstract	According to this invention there is provided a process for producing rayon grade pulp from coir bit fibres comprising in the steps of digestion of coir bit waste in the presence of digesting medium selected from sodium hydroxide, fungus, Purifying the digested pulp by soaking it in sodium hydroxide to produce cellulose, wherein step of cooking is avoided.

Full Text	FIELD OF INVENTION This invention relates to a process for producing rayon 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 colouring 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. Stil1 further, when the fibre is extracted from the husk during the step of mechanical extraction, the fibres tend to break« and also 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 rayon grade pulp from coir bit fibres- Another object of this invention is to propose a process for producing rayon grade pulp from coir bit wastes but which has a quality as good as that prepared f rom wood chips. Stil1 another object of this invention is to propose a process for producing rayon 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 rayon 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 rayon grade pulp from coir bit fibres which comprises in the steps of: a) digestion of coir bit waste in the presence of a fungus and a nutrient. b) Purifying the digested pulp by soaking it in sodium hydroxide to produce cellulose. A process as claimed in claim 1 wherein the step of digestion is carried out in the presence of white rot fungus and a nutrient such as urea. In accordance with one embodiment of this invention, the coir bit waste is subjected to the step of digestion in the presence of sodium hydroxide having a concentration of 4 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 for a period of 6 to 24 hours. The digested coir bit waste is neutralized with hydrochloric acid, as a neutral pH is required and again washed to flush out any residual acid or alkali. The step of digestion may be carried out in the presence of pressure of 2 to 4 kg/cm2. In accordance with another embodiment of this invention the coir bit waste is subjected to the step of digestion in the presence of sodium hydroxide solution under pressure and at a temperature of 100-150°C. 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 l:14 to l:l7. The digestion is carried out in the presence of pressure of 2 2 to 4 kg/cm . In accordance with yet another embodiment of this invention, the step of digestion is carried out in the presence of white rot fungus and a nutrient such as urea. The step of digestion is carried out in the presence of white rot fungus comprising Pleurotus sozar caju or Phanerochaete chrysosporium used singularly or in combination. The ratio of fungus culture to coir is 1 to 5 kg of culture to every 1 metric ton of coir. The digestion is carried out for a period of 7 to 35 days. 3 to 6 kg of urea is present to every metric of coir. The digested pulp is soaked in sodium hydroxide solution having a concentration of 16 to 20%, which purifies the pulp to produce cellulose. WE CLAIM; 1. A process for producing rayon grade pulp from coir bit fibres which comprises in the steps of: a) digestion of coir bit waste in the presence of a fungus and a nutrient. b) Purifying the digested pulp by soaking it in sodium hydroxide to produce cellulose. 2. A process as claimed in claim 1 wherein sodium hydroxide having a concentration of 4-16%. 3. A process as claimed in claim 1 wherein the ratio of the coir bit fibres to sodium hydroxide solution is 1:14 to 1:17. 4. A process as claimed in claim 1 wherein the step of digestion is carried out in the presence of pressure of 2 to 4 kg/cm2. 5. A process as claimed in claim 1 wherein the digestion is carried out for a period 6 to 24 hours. 6. A process as claimed in claim 1 wherein the step of digestion is carried out in the presence of sodium hydroxide solution under pressure and at a temperature of 100-150°C. 7. A process as claimed in claim 1 wherein the step of digestion is carried out in the presence of white rot fungus and a nutrient such as urea. 8. A process as claimed in claim 7 wherein the step of digestion is carried out in the presence of white rot fungus comprising Pleurotus sozar caju or phanerochaete chrysosporium used singularly or in combination. 9. A process as claimed in claim 8 wherein the ratio of fungus culture to coir is 1 to 5 kg of culture to every 1 metric ton of coir, 10. A process as claimed in claim 8 wherein the digestion is carried out for a period of 7 to 35 days. 11. A process as claimed in claim 8 wherein 3 to 6 kg of urea is present to every metric of coir, 12. A process as claimed in claim 1 wherein the digested pulp is soaked in sodium hydroxide having a concentration of 16 to 20%. 13. A process for producing rayon grade pulp substantially as herein described.

Full Text

FIELD OF INVENTION
This invention relates to a process for producing rayon 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 colouring
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. Stil1 further, when the fibre is extracted from the husk during the step of mechanical extraction, the fibres tend to break« and also 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 rayon grade pulp from coir bit fibres-
Another object of this invention is to propose a process for producing rayon grade pulp from coir bit wastes but which has a quality as good as that prepared f rom wood chips.
Stil1 another object of this invention is to propose a process for producing rayon 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 rayon 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 rayon grade pulp from coir bit fibres which comprises in the steps of:
a) digestion of coir bit waste in the presence of a fungus and a nutrient.
b) Purifying the digested pulp by soaking it in sodium hydroxide to produce cellulose.
A process as claimed in claim 1 wherein the step of digestion is carried out in the presence of white rot fungus and a nutrient such as urea.
In accordance with one embodiment of this invention, the coir bit waste is subjected to the step of digestion in the presence of sodium hydroxide having a concentration of 4 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 for a period of 6 to 24 hours. The digested coir bit waste is neutralized with hydrochloric acid, as a neutral pH is required and again washed to flush out any residual acid or alkali. The step of digestion may be carried out in the presence of pressure of 2 to 4 kg/cm2.
In accordance with another embodiment of this invention the coir bit waste is subjected to the step of digestion in the presence of sodium hydroxide solution under pressure and at a temperature of 100-150°C. 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 l:14 to l:l7. The
digestion is carried out in the presence of pressure of
2
2 to 4 kg/cm .
In accordance with yet another embodiment of
this invention, the step of digestion is carried out in the presence of white rot fungus and a nutrient such as
urea. The step of digestion is carried out in the presence of white rot fungus comprising Pleurotus sozar
caju or Phanerochaete chrysosporium used singularly or in combination. The ratio of fungus culture to coir is
1 to 5 kg of culture to every 1 metric ton of coir. The digestion is carried out for a period of 7 to 35 days.
3 to 6 kg of urea is present to every metric of coir.
The digested pulp is soaked in sodium hydroxide solution having a concentration of 16 to 20%, which purifies the pulp to produce cellulose.

WE CLAIM;
1. A process for producing rayon grade pulp from coir bit fibres
which comprises in the steps of:
a) digestion of coir bit waste in the presence of a fungus and a nutrient.
b) Purifying the digested pulp by soaking it in sodium hydroxide to produce cellulose.

2. A process as claimed in claim 1 wherein sodium hydroxide having a concentration of 4-16%.
3. A process as claimed in claim 1 wherein the ratio of the coir bit fibres to sodium hydroxide solution is 1:14 to 1:17.

4. A process as claimed in claim 1 wherein the step of digestion is carried out in the presence of pressure of 2 to 4 kg/cm2.
5. A process as claimed in claim 1 wherein the digestion is carried out for a period 6 to 24 hours.
6. A process as claimed in claim 1 wherein the step of digestion is carried out in the presence of sodium hydroxide solution under pressure and at a temperature of 100-150°C.
7. A process as claimed in claim 1 wherein the step of digestion is carried out in the presence of white rot fungus and a nutrient such as urea.

8. A process as claimed in claim 7 wherein the step of digestion is carried out in the presence of white rot fungus comprising Pleurotus sozar caju or phanerochaete chrysosporium used singularly or in combination.
9. A process as claimed in claim 8 wherein the ratio of fungus culture to coir is 1 to 5 kg of culture to every 1 metric ton of coir,
10. A process as claimed in claim 8 wherein the digestion is carried
out for a period of 7 to 35 days.
11. A process as claimed in claim 8 wherein 3 to 6 kg of urea is
present to every metric of coir,
12. A process as claimed in claim 1 wherein the digested pulp is
soaked in sodium hydroxide having a concentration of 16 to
20%.
13. A process for producing rayon grade pulp substantially as
herein described.

Documents:

065-mas-1999-abstract.pdf

065-mas-1999-claims filed.pdf

065-mas-1999-claims granted.pdf

065-mas-1999-correspondnece-others.pdf

065-mas-1999-correspondnece-po.pdf

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

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

065-mas-1999-form 1.pdf

065-mas-1999-form 26.pdf

065-mas-1999-other document.pdf

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Patent Number

210265

Indian Patent Application Number

65/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 NATIONAL OF COIR BOARD, 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

D 01 C 1/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA