Title of Invention	"A COMPOSITION USEFUL FOR THE DETECTING CARBONDIOXIDE"
Abstract	The invention relates to a composition useiul for detecting carbon dioxide gas. The composition is useful for detection of carbon dioxide present in underground coal mine, in general coal mine environment. It has also wide application in assessing carbon dioxide gas in places like tunnels, caves. A composition consists of hydrazine hydrate and crystal violet solution in absolute alcohol. It allows spot and direct reading, cost effective handy and reliable.

Title of Invention

"A COMPOSITION USEFUL FOR THE DETECTING CARBONDIOXIDE"

Abstract

The invention relates to a composition useiul for detecting carbon dioxide gas. The composition is useful for detection of carbon dioxide present in underground coal mine, in general coal mine environment. It has also wide application in assessing carbon dioxide gas in places like tunnels, caves. A composition consists of hydrazine hydrate and crystal violet solution in absolute alcohol. It allows spot and direct reading, cost effective handy and reliable.

Full Text	The present Invention relates to a composition useful for detecting carbondioxide gas. The first ever detector tube was developed by Hoover and Lamp in 1917 during the first world war. It was the famous hola-mixe detector tube for carbon monoxide which was inconsiderable use for over twenty five years. Between the end of world war I and II useful contribution on the determination of arsenic hydrogen sulphide, sulphurdioxide, benzene, hydrogen cyanide with the help of Indicator tube based on colorometric reaction have been reported. Mortin Shepherd and his co-workers developed monoxide in the range of 10 to 1000 ppm. The tube is marketed today on the basis of patent process developed in USA and India. Kotagowa of Yokahama National University developed in large number of detector tubes. In the early 80s a number of manufacturing firms of USA, Germany, France, Sweden and Japan began to produce a line of such products. These imported tubes are neither easily available nor coot offoctive. The main objective of the present invention is to provide a composition useful for detection of carbondioxide present in underground coal mine, in general coal mine environment. It has also wide application in assessing carbondioxide gas in confined places like tunnels, caves, frequented by tourists and pilgrims. The composition of the present invention is filled into a glass tube of definite length and diameter with both ends sealed. The composition consists of reacting chemical impregnated with silica gel of definite size, pore volume and bulk density. The reacting chemical is a mixture of hydrazine hydrate and crystal violet solution dissolved in absolute alcohol which after Impregnation with silica gel is dried by suction. The dried impregnated silica gel is then filled into the glass tube by means of dozer to a particular length plugged with purified white cotton and then sealed by fusion. The impregnation, drying and filling must be carried out in an atmosphere free from carbondioxide. Accordingly the present invention provides a composition useful for detecting carbon dioxide gas which comprises hydrazine hydrate and crystal violet 0.05 to 0.5 wt % solution in absolute alcohol in the ratio of hydrazine hydrate 5 to 20 ml.: 100 ml. of crystal violet solution in absolute alcohol. The composition of the present invention is not a mere admixture but a synergistic mixture which has properties different than the individual components and it does not involve any chemical reaction. The hydrazine hydrate, absolute alcohol and crystal violet used may be of A.R. grade. The composition of the present invention is impregnated with purified silica gel. The commercial silica gel having bulk density 0 46 g/ml and sieve size -50 +60 B.S.S. is purified by digesting with L.R. grade concentrated nitric acid for 12 to 46 hr in water bath. After digestion, washed-several times with hot distilled water till the pH comes 5.5 to 6 after washing heated in a furnace at 600-700°C for 3-4 hours. Cooled and kept in a well stoppered bottle for use. The purified silica gel impregnated with composition of the present invention is filled in glass tube. Neutral glass tube of internal dia 2 mm and 30 cm length cut into pieces according to requirement. Dipped in chromic and for 24-48 hour and then washed several times with water finally with distilled water. After drying in air oven, one end of each tube is fuse sealed. Now it is ready for filling with composition required for CO2. Purified white cotton is used for plugging before and after filling the glass tube with chemical. It is purified with distilled water three-four times and then dried in an air oven at 100-110°C, 100 g of washed silica gel 50 +60 B.S.S. dried at 300°C for one hour before impregnation taken in a vessel fitted with stop cocks. Evacuated to drive away the air inside the pore. 100 ml of reacting solution poured into the vessel in suction condition. Mixed properly and vacuum dried. Filled in and then flame sealed. Now the tube is ready for cali-bra 11 on and use. The following examples are given by way of illustration and should not be construed to limit the scope of the present invention. Sample is drawn by means of hand operated aspirator of 50 ml rubber bulb capacity through the tube (containing composition consisting 15 ml hydrazine hydrate mixed with 100 ml 0.1% crystal violet solution in absolute alcohol mixed with purified silica gel. The length of reacting material and internal dia of the tube being 7 cm and 2 mm) with 10 strokes of the pump. The length of the purple colouration zone is the concentration of CO2 in % vol. where the concentration of CO2 is above 1% vol. the sample is to be drawn through the tube with 1 stroke of the pump. Result S1.No. % Vol CO2 Length (mm.) 1 0-1 5 2. 0.2 8 3. 0.4 13 4. 0.6 18 5, 0.8 23 6. 1.0 28 The main advantages of the present invention are : i) The composition allows spot and direct reading ii) It is cost effective, handy and reliable, iii) The method of preparation is simple. We claim: 1. A composition useful for detecting carbon dioxide gas which comprises hydrazine hydrate and crystal violet 0.05 to 0.5 wt % solution in absolute alcohol in the ratio of hydrazine hydrate 5 to 20 ml. : 100 ml. of crystal violet solution in absolute alcohol. 2. A composition as claimed in claim 1 wherein the hydrazine hydrate, crystal violet and absolute alcohol are of A.R. grade. 3. A composition useful for detecting carbon dioxide substantially as herein described with reference to the examples.

Full Text

The present Invention relates to a composition useful for detecting carbondioxide gas.
The first ever detector tube was developed by Hoover and Lamp in 1917 during the first world war. It was the famous hola-mixe detector tube for carbon monoxide which was inconsiderable use for over twenty five years. Between the end of world war I and II useful contribution on the determination of arsenic hydrogen sulphide, sulphurdioxide, benzene, hydrogen cyanide with the help of Indicator tube based on colorometric reaction have been reported. Mortin Shepherd and his co-workers developed monoxide in the range of 10 to 1000 ppm. The tube is marketed today on the basis of patent process developed in USA and India. Kotagowa of Yokahama National University developed in large number of detector tubes. In the early 80s a number of manufacturing firms of USA, Germany, France, Sweden and Japan began to produce a line of such products. These imported tubes are neither easily available nor coot offoctive.
The main objective of the present invention is to provide a composition useful for detection of carbondioxide present in underground coal mine, in general coal mine environment. It has also wide application in assessing carbondioxide gas in confined places like tunnels, caves, frequented by tourists and pilgrims.
The composition of the present invention is filled into a glass tube of definite length and diameter with both ends sealed. The composition consists of reacting chemical impregnated with silica gel of definite size, pore volume and bulk density. The reacting chemical is a mixture of hydrazine hydrate and crystal violet solution dissolved in absolute alcohol which after Impregnation with silica gel is dried by suction. The dried impregnated silica gel is then filled into the glass tube by means of dozer to a particular length plugged with purified white cotton and then sealed by fusion. The impregnation, drying and filling must be carried out in an atmosphere free from carbondioxide.
Accordingly the present invention provides a composition useful for detecting carbon dioxide gas which comprises hydrazine hydrate and crystal violet 0.05 to 0.5 wt % solution in absolute alcohol in the ratio of hydrazine hydrate 5 to 20 ml.: 100 ml. of crystal violet solution in absolute alcohol.
The composition of the present invention is not a mere admixture but a synergistic mixture which has properties different than the individual components and it does not involve any chemical reaction.
The hydrazine hydrate, absolute alcohol and crystal violet used may be of A.R. grade.
The composition of the present invention is impregnated with purified silica gel. The commercial silica gel having bulk density 0 46 g/ml and sieve size -50 +60 B.S.S. is purified by digesting with L.R. grade concentrated nitric acid for 12 to 46 hr in water bath. After digestion, washed-several times with hot distilled water till the pH comes 5.5 to 6 after washing heated in a furnace at 600-700°C for 3-4 hours. Cooled and kept in a well stoppered bottle for use. The purified silica gel impregnated with composition of the present invention is filled in glass tube. Neutral glass tube of internal dia 2 mm and 30 cm length cut into pieces according to requirement. Dipped in chromic and for 24-48 hour and then washed several times with water finally with distilled water. After drying in air oven, one end of each tube is fuse sealed. Now it is ready for filling with composition required for CO2. Purified white cotton is used for plugging before and after filling the glass tube with chemical. It is purified with distilled water three-four times and then dried in an air oven at 100-110°C, 100 g of washed silica gel 50 +60 B.S.S. dried at 300°C for one hour before impregnation taken in a vessel fitted with stop cocks. Evacuated to drive away the air inside the pore. 100 ml of reacting solution poured into the vessel in suction condition. Mixed properly and vacuum dried. Filled in and then flame sealed. Now the tube is ready for cali-bra 11 on and use.
The following examples are given by way of illustration and should not be construed to limit the scope of the present invention.
Sample is drawn by means of hand operated aspirator of 50 ml rubber bulb capacity through the tube (containing composition consisting 15 ml hydrazine hydrate mixed with 100 ml 0.1% crystal violet solution in absolute alcohol mixed with purified silica gel. The length of reacting material and internal dia of the tube being 7 cm and 2 mm) with 10 strokes of the pump.
The length of the purple colouration zone is the concentration of CO2 in % vol. where the concentration of CO2 is above 1% vol. the sample is to be drawn through the tube with 1 stroke of the pump.
Result
S1.No. % Vol CO2 Length (mm.)
1 0-1 5
2. 0.2 8
3. 0.4 13
4. 0.6 18
5, 0.8 23
6. 1.0 28
The main advantages of the present invention are :
i) The composition allows spot and direct reading ii) It is cost effective, handy and reliable, iii) The method of preparation is simple.

We claim:
1. A composition useful for detecting carbon dioxide gas which comprises hydrazine hydrate and crystal violet 0.05 to 0.5 wt % solution in absolute alcohol in the ratio of hydrazine hydrate 5 to 20 ml. : 100 ml. of crystal violet solution in absolute alcohol.
2. A composition as claimed in claim 1 wherein the hydrazine hydrate, crystal violet and absolute alcohol are of A.R. grade.
3. A composition useful for detecting carbon dioxide substantially as herein described with reference to the examples.

Documents:

1710-del-1997-abstract.pdf

1710-del-1997-claims.pdf

1710-del-1997-complete specification (granted).pdf

1710-del-1997-correspondence-others.pdf

1710-del-1997-correspondence-po.pdf

1710-del-1997-description (complete).pdf

1710-del-1997-form-1.pdf

1710-del-1997-form-19.pdf

1710-del-1997-form-2.pdf

1710-del-1997-form-9.pdf

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Patent Number

193286

Indian Patent Application Number

1710/DEL/1997

PG Journal Number

29/2004

Publication Date

17-Jul-2004

Grant Date

23-Dec-2005

Date of Filing

24-Jun-1997

Name of Patentee

COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH

Applicant Address

RAFI MARG, NEW DELHI-110 001, INDIA

Inventors:

#	Inventor's Name	Inventor's Address
1	KARUVAPATTY CHAMLYER JAYPRAKASH	CENTRAL MINING RESEARCH INSTITUTE, DHANBAD- 826 001, INDIA
2	KRISHNA NARAYAN MONDAL	CENTRAL MINING RESEARCH INSTITUTE, DHANBAD- 826 001, INDIA
3	BHARAT BHUSHANA DHAR	CENTRAL MINING RESEARCH INSTITUTE, DHANBAD- 826 001, INDIA
4	MOHAN LAL MAHTO	CENTRAL MINING RESEARCH INSTITUTE, DHANBAD- 826 001, INDIA

PCT International Classification Number

C07D 209/86

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA