EP0974026B1 - Porous mass asbestos free for acetylene vessels - Google Patents
Porous mass asbestos free for acetylene vessels Download PDFInfo
- Publication number
- EP0974026B1 EP0974026B1 EP97921510A EP97921510A EP0974026B1 EP 0974026 B1 EP0974026 B1 EP 0974026B1 EP 97921510 A EP97921510 A EP 97921510A EP 97921510 A EP97921510 A EP 97921510A EP 0974026 B1 EP0974026 B1 EP 0974026B1
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- European Patent Office
- Prior art keywords
- mass
- per cent
- acetylene
- contents
- mass per
- Prior art date
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- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 title claims abstract description 24
- 239000010425 asbestos Substances 0.000 title claims abstract description 18
- 229910052895 riebeckite Inorganic materials 0.000 title claims abstract description 18
- 235000012241 calcium silicate Nutrition 0.000 claims abstract description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 17
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000004327 boric acid Substances 0.000 claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 229920002994 synthetic fiber Polymers 0.000 claims abstract description 15
- 239000003513 alkali Substances 0.000 claims abstract description 13
- 239000003365 glass fiber Substances 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims abstract description 10
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 10
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims abstract description 10
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims abstract description 10
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 6
- 239000004571 lime Substances 0.000 claims abstract description 6
- 239000011148 porous material Substances 0.000 claims abstract description 6
- 239000010453 quartz Substances 0.000 claims abstract description 5
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 19
- 239000000378 calcium silicate Substances 0.000 claims description 18
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 16
- 239000000945 filler Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 11
- 239000000725 suspension Substances 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 2
- 239000007900 aqueous suspension Substances 0.000 claims 1
- 239000000463 material Substances 0.000 description 14
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 229910001868 water Inorganic materials 0.000 description 9
- 239000000292 calcium oxide Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 6
- 235000012255 calcium oxide Nutrition 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- UGGQKDBXXFIWJD-UHFFFAOYSA-N calcium;dihydroxy(oxo)silane;hydrate Chemical compound O.[Ca].O[Si](O)=O UGGQKDBXXFIWJD-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- MKTRXTLKNXLULX-UHFFFAOYSA-P pentacalcium;dioxido(oxo)silane;hydron;tetrahydrate Chemical compound [H+].[H+].O.O.O.O.[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O MKTRXTLKNXLULX-UHFFFAOYSA-P 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000008234 soft water Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005802 health problem Effects 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C11/00—Use of gas-solvents or gas-sorbents in vessels
- F17C11/002—Use of gas-solvents or gas-sorbents in vessels for acetylene
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/02—Compositions containing acetylene
- C10L3/04—Absorbing compositions, e.g. solvents
Definitions
- This invention falls into the technology of materials production scope based on calcium hydrosilicates having the intention to serve as a filler material in the steel vessels, thus enabling a safe storaging, transportation and the consumption of solved acetylene.
- Acetylene is usually kept in gaseous state solved in some of the solvents such as acetone soaked by a porous mass, in this particular situation the calcium silicate.
- Asbestos used to be taken for reinforcement of calcium silicates which was added into the mixture of various materials whose basis is calcium oxide, silica and water.
- Such mixed suspension was introduced into the vessels equipped with special regulation valves, where, under the influence of a raised temperature and pressure in the autoclaves conditions, there came to stiffening of the suspension into a crystalline calcium silicate structure.
- the stiff mass, together with the steel vessel without a pressure gauge, was then exposed to a raised temperature with the aim of releasing of nearly whole amount of free water quantity, aside from the bound water in crystal structure of calcium silicate.
- the role of asbestos was, beside reinforcing calcium silicate, to enable a uniform fill-up of the vessel with raw mass, without an increased slackening of the input components in the raw mass.
- porous mass as a filler material is to uniformly fill the vessel's volume intended for storaging, thus enabling the inlet of the acetylene solvent (mostly acetone or dimethylformamide), as well as the inlet of the gas which is solved in it.
- This is enabled by exceptionally high porosity of the material provided - the calcium silicate which is characterised by very fine and uniformly distributed pores whose dimensions are up to about 25 ⁇ m, which make an effective contact possible of the gas and solvent as well as a proper filling and discharging of the acetylene vessels.
- the stiffening and drying processes of the mass is performed in such a way that the distance between the steel vessel's shell and monolithic mass should not exceed 3 mm.
- the porosity of calcium silicate mass reinforced by means of asbestos fibres amounts to 85 % up to about 92 % in voL
- calcium silicate mass has the task of preventing a progressive disintegration of acetylene in the vessel, and when it comes to sparkling inside it, caused by the possible dragging in of the back fire from the burner, in the conditions of regular consumption of acetylene in practice.
- the new product whose basis is the monolithic calcium silicate without asbestos contents, reinforced by uniformly distributed mixture of synthetic fibres on the basis of carbon and glass fibres resistant to alkali, with the addition of boric acid and carboxymethylcellulose, representing a good variant of the filler for the vessels in which the gaseous acetylene solved in the solvent, for example acetone, is safely storaged, kept and transported.
- Calcium silicate monolithic filler obtained by the new procedure, contains a mixture of crystal phase Tobermorite and Xonotlite, having the porosity 86 - 93 % and the equally distributed fine pores.
- Calcium silicate monolithic filling without asbestos contains an equally dispersed mixture of glass fibres resistant to alkali and synthetic fibres based on carbon, to which boric acid is added, secure a satisfactory mechanical strength of material, at the same time retaining a high porosity, which obtains optimum characteristics bound to the gas quantity which is possible to be storaged in the vessels, providing a high degree safeness, when used.
- the biggest importance for the monolithic crystal filling is to be formed in such a way so that the initial components should be homogeneously mixed according to the following mass ratios.
- carboxymethylcellulose does not exceed 0.5 %. It is added with the aim of preventing of settling of components in the raw mass, before the stiffening phase in autoclave. During baking procedure there occurs to its disintegration - pyrolisys, so favourably affecting the final porosity of the silicate mass.
- boric acid which favourably affects onto the ratio of obtained crystals phases during autoclaving procedure, which has a positive influence on the shrinkage during baking process.
- Production of the new calcium silicate filler material together with the raw materials within the said mass ratios is performed the following way.
- the soft water whose total contents depends on the aimed porosity, approximately in the range of 3 : 1 up to 4 : 1 related to dry substance, is added the CaO in order to obtain, by means of agitating, the Ca(OH) 2 , the lime suspension.
- Such homogeneous, well agitated suspension of all components is poured into the vessels for keeping the acetylene which are vacuumised at the same time.
- the suspension must be previously cooled to 20 - 35°C, having in mind it was, in the exothermic process of "slaking" the quick lime, heated up to about 50°C.
- the suspension is equally distributed in the whole volume of the vessel so as to avoid the possible cavities and bubbles of air in the mass.
- the decisive part is on the dispersed components of the carboxymethylcellulose solution and the mixture of glass and synthetic fibres based on carbon.
- the so filled vessel is equipped with a special shutting device having a pressure regulating unit which is screwed onto the vessel opening provided with a valve.
- the so prepared vessel is exposed to autoclaving process in the furnace with residing temperature from 180 to 220°C.
- the autoclaving process lasts about 20 to 50 hours, depending on the vessel volume, during which time it comes to the stiffening of suspension into a monolithic mass in the vessel itself
- the vessel On elapsing the necessary time, the vessel is taken out of the furnace and is left to be completely cooled.
- the shutting device together with pressure regulator is dismantled from the vessel and the opened vessel with calcium silicate filler material is taken into the furnace where the drying process takes place.
- the drying process takes as long as nearly the whole quantity of free water is removed out from the calcium silicate mass.
- the regime of drying process is adjusted so as not to cause an abrupt water evaporation out of the mass itself, which could imply to building up of major cavities and canals within the mass. For that reason, the increase of temperature up to 180°C lasts for 4 hours, and then it is gradually raised to 230 and up to 350°C at which it is maintained to the end of the drying process. Total time of drying process amounts to about 80 hours.
- Figure 1/1 shows the example of vessel outlook intended for storaging, keeping and transportation of solved acetylene gas, which contains the metal shell with accompanying valve (2), metal support (3), calcium silicate monolithic filling without asbestos contents (4), a bored hole in monolithic mass filled with quartz sand (5), felt (6), steel net (7), and a free space up to 3 mm (8) between the steel cylinder body and the filling.
- the so prepared mass is poured into the acetylene vessels which are at the same time vacuumized with the purpose of removal of the remained air.
- the vessels are taken into the furnace where the process of autoclaving is performed at the temperature of 190°C.
- the obtained calcium silicate filling has the volumetric mass of 255 g/l. Porosity is 91,9 %, and the compression strength is around 240 N/cm 2 .
- the mass obtained after autoclaving and drying has the porosity 91,2 % and compression strength of 270 N/cm 2 .
- Volumetric mass is 253 g/l.
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
- Carbon And Carbon Compounds (AREA)
- Aftertreatments Of Artificial And Natural Stones (AREA)
Abstract
The new porous mass without asbestos contents is intended for the filling of the vessels for storaging, transportation and consumption of acetylene, based on calcium silicates, obtained from lime, quartz and boric acid, containing up to 10 mass per cent, counted towards dry matter, of a fine dispersed mixture of the synthetic fibres based on carbon and alkali resistant glass fibres, with the addition, if necessary, up to 0,5 mass per cent carboxymethylcellulose, containing fine, uniformly distributed pores, mainly without the cavities within the mass, whose porosity at least equals to 88 %.
Description
This invention falls into the technology of materials production scope based on calcium
hydrosilicates having the intention to serve as a filler material in the steel vessels, thus enabling
a safe storaging, transportation and the consumption of solved acetylene.
Technical problem which is solved by means of this invention is the procedure for the
production of a new high porous material intended for acetylene vessels, based on the calcium
silicates, reinforced by means of a mixture of synthetic fibres on the basis of carbon and glass
fibres resistant to alkali with addition of boric acid and carboxymethylcellulose. The mentioned
product, the porous mass having porosity of 88 % up to 93 % in volume, hardened to a
monolithic structure in a steel vessel, soaked by means of solvents, having the gap between the
mass and the steel vessel being below 3 mm, thus enabling a safe filling, storaging and
discharging the acetylene in gaseous state.
Technical gasses, depending on their nature and aggregate state, are kept and storaged
in different ways. Acetylene is usually kept in gaseous state solved in some of the solvents such
as acetone soaked by a porous mass, in this particular situation the calcium silicate. Asbestos
used to be taken for reinforcement of calcium silicates, which was added into the mixture of
various materials whose basis is calcium oxide, silica and water. Such mixed suspension was
introduced into the vessels equipped with special regulation valves, where, under the
influence of a raised temperature and pressure in the autoclaves conditions, there came to
stiffening of the suspension into a crystalline calcium silicate structure. The stiff mass, together
with the steel vessel without a pressure gauge, was then exposed to a raised temperature with
the aim of releasing of nearly whole amount of free water quantity, aside from the bound
water in crystal structure of calcium silicate.
The role of asbestos was, beside reinforcing calcium silicate, to enable a uniform fill-up
of the vessel with raw mass, without an increased slackening of the input components in the
raw mass.
This is of special importance, knowing that acetylene is an unstable gas and the empty
spaces can be the source of danger leading to explosion and a spontaneous disintegration of
acetylene into its constituent elements.
The role of porous mass as a filler material is to uniformly fill the vessel's volume
intended for storaging, thus enabling the inlet of the acetylene solvent (mostly acetone or
dimethylformamide), as well as the inlet of the gas which is solved in it. This is enabled by
exceptionally high porosity of the material provided - the calcium silicate which is
characterised by very fine and uniformly distributed pores whose dimensions are up to about
25 µm, which make an effective contact possible of the gas and solvent as well as a proper
filling and discharging of the acetylene vessels. The stiffening and drying processes of the mass
is performed in such a way that the distance between the steel vessel's shell and monolithic
mass should not exceed 3 mm. The porosity of calcium silicate mass reinforced by means of
asbestos fibres amounts to 85 % up to about 92 % in voL
Beside prevention of the settling of the raw mass before autoclaving, the role of
asbestos was to prevent the forming of cracks in the mass as well as of free cavities under the
influence of outer mechanical impacts, to which the vessels are exposed in the conditions of
exploiting or transportation.
In addition to aforesaid, calcium silicate mass has the task of preventing a progressive
disintegration of acetylene in the vessel, and when it comes to sparkling inside it, caused by the
possible dragging in of the back fire from the burner, in the conditions of regular consumption
of acetylene in practice.
The crystal phase of the porous mass and the mutual ratio of the obtained crystals
structures Tobermorite and Xonotlite in it during the phase of autoclaving, plays an important
role in obtaining the favourable characteristics of strength and shrinkage of the product.
All mentioned positive characteristics of the calcium silicate filler material intended for
the vessels for storaging and keeping of solved acetylene, can be obtained by using asbestos
fibres as the means for reinforcement and prevention of settling inside the vessels, as defined in
USA patent No. 2.883.040.
However, it is generally known that asbestos has been proclaimed a material causing
health problems with people coming into contact with it. It was the reason for some national
and international institutions to forbid the use of asbestos for these purposes. For this reason, it
has been worked on the invention of the new filler materials intended for the storaging and
keeping the acetylene without asbestos contents.
Adequately, for example, the new procedures for production of monolithic fillings of
acetylene vessels without asbestos contents EP 264550, EP 625963, US 4,970,246. have been
patented.
The new product, whose basis is the monolithic calcium silicate without asbestos
contents, reinforced by uniformly distributed mixture of synthetic fibres on the basis of carbon
and glass fibres resistant to alkali, with the addition of boric acid and carboxymethylcellulose,
representing a good variant of the filler for the vessels in which the gaseous acetylene solved
in the solvent, for example acetone, is safely storaged, kept and transported.
Calcium silicate monolithic filler obtained by the new procedure, contains a mixture of
crystal phase Tobermorite and Xonotlite, having the porosity 86 - 93 % and the equally
distributed fine pores.
Calcium silicate monolithic filling without asbestos contains an equally dispersed
mixture of glass fibres resistant to alkali and synthetic fibres based on carbon, to which boric
acid is added, secure a satisfactory mechanical strength of material, at the same time retaining a
high porosity, which obtains optimum characteristics bound to the gas quantity which is
possible to be storaged in the vessels, providing a high degree safeness, when used.
The biggest importance for the monolithic crystal filling is to be formed in such a way
so that the initial components should be homogeneously mixed according to the following mass
ratios.
1. The contents of carboxymethylcellulose does not exceed 0.5 %. It is added with the
aim of preventing of settling of components in the raw mass, before the stiffening phase in
autoclave. During baking procedure there occurs to its disintegration - pyrolisys, so favourably
affecting the final porosity of the silicate mass.
2. Up to 3 % of boric acid which favourably affects onto the ratio of obtained crystals
phases during autoclaving procedure, which has a positive influence on the shrinkage during
baking process.
3. Mixture of glass fibres resistant to alkali, containing approximately 17 to 20 % of
ZrO2 and synthetic fibres based on carbon, whose total mass contents does not exceed 10 %
counted for dry material. The contents of the synthetic fibres based on carbon in this invention
amounts to 0.5 to 5 % of dry material, the rest represents the glass fibres resistant to alkali.
The length of both fibres is from 5 to 20 mm, and the thickness being within 5 to 20 µm.
4. The high reactive quick lime - calcium oxide (CaO) and ground silica (SiO2) in this
procedure are mixed within the components mass ratio CaO: SiO2= 0,80 - 1,00.
Production of the new calcium silicate filler material together with the raw materials
within the said mass ratios is performed the following way.
The soft water, whose total contents depends on the aimed porosity, approximately in
the range of 3 : 1 up to 4 : 1 related to dry substance, is added the CaO in order to obtain, by
means of agitating, the Ca(OH)2, the lime suspension.
The so obtained suspension, during its continuous agitation, is added the synthetic
fibres based on carbon, boric acid, carboxymethylcellulose if necessary as well as the
necessary quantity of silica within the mass ratios as previously explained.
Such homogeneous, well agitated suspension of all components, is poured into the
vessels for keeping the acetylene which are vacuumised at the same time. The suspension must
be previously cooled to 20 - 35°C, having in mind it was, in the exothermic process of
"slaking" the quick lime, heated up to about 50°C. The suspension is equally distributed in the
whole volume of the vessel so as to avoid the possible cavities and bubbles of air in the mass.
In this stage of filling along with provision of a good fluency of the mass and maintaing a
complete fulfilness of the vessel preventing the settling, the decisive part is on the dispersed
components of the carboxymethylcellulose solution and the mixture of glass and synthetic
fibres based on carbon.
The so filled vessel is equipped with a special shutting device having a pressure
regulating unit which is screwed onto the vessel opening provided with a valve.
The so prepared vessel is exposed to autoclaving process in the furnace with residing
temperature from 180 to 220°C. The autoclaving process lasts about 20 to 50 hours,
depending on the vessel volume, during which time it comes to the stiffening of suspension into
a monolithic mass in the vessel itself On elapsing the necessary time, the vessel is taken out of
the furnace and is left to be completely cooled. The shutting device together with pressure
regulator is dismantled from the vessel and the opened vessel with calcium silicate filler
material is taken into the furnace where the drying process takes place.
The drying process takes as long as nearly the whole quantity of free water is removed
out from the calcium silicate mass. The regime of drying process is adjusted so as not to
cause an abrupt water evaporation out of the mass itself, which could imply to building up of
major cavities and canals within the mass. For that reason, the increase of temperature up to
180°C lasts for 4 hours, and then it is gradually raised to 230 and up to 350°C at which it is
maintained to the end of the drying process. Total time of drying process amounts to about 80
hours.
During drying process there occurs the shrinkage of the porous mass within its whole
volume and building up of interspace between the mass and metal shell of the vessel which, as
aforesaid, must not exceed 3 mm. By adding boric acid, with this invention, in the process of
autoclaving there comes to the aimed effect i.e. shrinkage of mass at raised temperatures,
which provides satisfactory characteristics of accepting the solvent and gas and release of gas
out from the vessel during the exploitation stage.
Figure 1/1 shows the example of vessel outlook intended for storaging, keeping and
transportation of solved acetylene gas, which contains the metal shell with accompanying valve
(2), metal support (3), calcium silicate monolithic filling without asbestos contents (4), a bored
hole in monolithic mass filled with quartz sand (5), felt (6), steel net (7), and a free space up to
3 mm (8) between the steel cylinder body and the filling.
The following is the text giving the examples of obtaining the calcium silicate filler
material which are characteristic of this invention.
42,1 kg of quicklime is slaked in 200 litres of soft water which is previously heated to 25°C,
applying an intensive agitating. In another mixer 2 kg of boric acid is solved in 166,4 litres of
water. After 1,5 hours of agitating the lime the solution of boric acid is added, then 2,5 kg of
synthetic fibres based on carbon having the length of 7mm and thickness of 8 µm are added,
then 4,1 kg of glass fibres resistant to alkali having the length of 12 mm and thickness of 20µm
and 50,8 kg of quartz powder which is well homogenised by agitating it.
The so prepared mass is poured into the acetylene vessels which are at the same time
vacuumized with the purpose of removal of the remained air. The vessels are taken into the
furnace where the process of autoclaving is performed at the temperature of 190°C.
On finishing the autoclaving process the drying takes place at the temperature of
350°C.
The obtained calcium silicate filling has the volumetric mass of 255 g/l. Porosity is
91,9 %, and the compression strength is around 240 N/cm2.
57,5 kg of quicklime is slaked in 250 litres of water. In another mixer 1,4 kg of boric
acid and 0,28 kg of carboxymethylcellulose are solved agitating it by means of propeller
mixer at a speed of 150 revolutions per minute until the total solution of
carboxymethylcellulose and boric acid. This solution is added into mixer containing lime, and
then gradually 4,2 kg of synthetic fibres based on carbon, then 7 kg of glass fibres resistant to
alkali and 69,3 kg of quartz powder and then the mixing procedure is continued at a speed of
55 revolutions per minute, until a homogeneous mixture is obtained.
After autoclaving and drying a homogeneous porous filler of the acetylene vessel is
obtained, of the volumetric mass 250 g/l, porosity 92,81 % and compression strength of about
250 N/cm2.
The procedure of mass preparation is the same as described in Example I, where 49,3
kg of quicklime is slaked in 200 litres of water, and in the rest of 130 litres of water 1,2 kg of
boric acid is solved. Other components which are added into the lime suspension after mixing
with solved boric acid with 3,6 kg of synthetic fibres based on carbon, 6 kg of glass fibres
resistant to alkali and 59,3 kg of quartz powder.
The mass obtained after autoclaving and drying has the porosity 91,2 % and
compression strength of 270 N/cm2. Volumetric mass is 253 g/l.
The vessels with calcium silicate filler intended for filling of the interior of the vessel for
storaging, transportation and exploitation of acetylene, obtained in accordance with this
invention as shown in Examples I, II and III, completely meet the requirements of safety
precautions tests according to ISO 3807.
Claims (5)
- Porous mass without asbestos based on calcium silicates intended for filling up the vessel interior for storaging of acetylene,
characterized by, its being obtained of lime, quartz and boric acid, containing up to 10 mass per cent, counted towards dry matter, of a fine dispersed mixture of the synthetic fibres based on carbon and alkali resistant glass fibres, with the addition, if necessary, up to 0,5 mass per cent carboxymethylcellulose, containing fine, uniformly distributed pores, mainly without the cavities within the mass, whose porosity at least equals to 88 %. - Porous mass without asbestos according to claim 1,
characterized by, the contents up to 10 mass per cent of mixture of synthetic fibres based on carbon and glass fibres resistant to alkali, with the fact that the contents of synthetic fibres based on carbon equals from 0,5 to 5 mass per cent of the dry matter, while the rest represents glass fibres resistant to alkali. - Porous mass without asbestos according to claim 1,
characterized by, the contents up to 3 mass per cent of boric acid. - Porous mass without asbestos according to claim 1,
characterized by, the contents fine, uniformly distributed pores, whose contents equals to 88 - 93 volumetric per cent. - A method of producing a porous mass according to the preceding claims for vessels for the storage of acetylene,
characterized by, comprising the preparation of water suspension CaO and SiO2 in the ratio CaO : SiO2 = 0,8 - 1, then up to about 3 mass per cent of boric acid, counted towards dry mass, mixture up to 10 mass per cent of synthetic fibres based on carbon and glass fibres resistant to alkali, counted towards dry mass, carboxymethylcellulose, if necessary, up to 0,5 mass per cent counted towards dry mass, inletting the obtained suspension into metal vessel, autoclaving of it with the aim of stiffening at about 190°C, and drying at about 350°C, so that a monolithic calcium silicate filler is obtained, capable to safely accept the solvent and acetylene, and in exploitation it easily frees the gas from the solution.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| YU699966 | 1996-12-26 | ||
| YU69996 | 1996-12-26 | ||
| YU69996A YU48898B (en) | 1996-12-26 | 1996-12-26 | Porous mass asbestos free intended for filling of cylinders for acetylene storaging and a method of production a porous mass |
| PCT/YU1997/000004 WO1998029682A1 (en) | 1996-12-26 | 1997-05-22 | Porous mass asbestos free for acetylene vessels |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0974026A1 EP0974026A1 (en) | 2000-01-26 |
| EP0974026B1 true EP0974026B1 (en) | 2001-08-16 |
Family
ID=25551040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97921510A Expired - Lifetime EP0974026B1 (en) | 1996-12-26 | 1997-05-22 | Porous mass asbestos free for acetylene vessels |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0974026B1 (en) |
| AT (1) | ATE204368T1 (en) |
| DE (1) | DE69706198D1 (en) |
| WO (1) | WO1998029682A1 (en) |
| YU (1) | YU48898B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2904240B1 (en) | 2006-07-26 | 2008-12-05 | Air Liquide | TRAPPING STRUCTURE FOR GAS CONTAINER WITH CRYSTALLIZED MATERIAL IN THE FORM OF NEEDLES |
| FR2904239B1 (en) | 2006-07-26 | 2008-12-05 | Air Liquide | CRYSTALLINE PHASE STRAPPING STRUCTURE OF GAS CONTAINERS |
| FR2933396B1 (en) | 2008-07-02 | 2011-07-22 | Air Liquide | PROCESS FOR MANUFACTURING A TRAPPING STRUCTURE WITH CONTROL OF THE DRYING STEP |
| FR2933689B1 (en) * | 2008-07-11 | 2011-03-18 | Air Liquide | HIGH PERFORMANCE TRIM STRUCTURE WITH CONTROLLED SIDE GAMES |
| FR2948936B1 (en) | 2009-08-05 | 2011-10-28 | Air Liquide | POROUS CERAMIC MATERIAL HAVING AN ALVEOLAR ARCHITECTURE AND CONTROLLED MACROPOROSITY |
| FR2948884B1 (en) | 2009-08-05 | 2012-06-01 | Air Liquide | POROUS CERAMIC MATERIAL HAVING POROGENIC STACK CONTROLLED MACROPOROSITY |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4129450A (en) * | 1977-11-09 | 1978-12-12 | Union Carbide Corporation | Acetylene vessel filler composition |
| US4765458A (en) * | 1986-10-14 | 1988-08-23 | Ni Industries, Inc. | Asbestos free hardened monolithic filler mass |
| US5697990A (en) * | 1995-01-31 | 1997-12-16 | Worthington Acetylene Cylinder, Inc. | High porosity calcium silicate mass for storing acetylene gas |
-
1996
- 1996-12-26 YU YU69996A patent/YU48898B/en unknown
-
1997
- 1997-05-22 WO PCT/YU1997/000004 patent/WO1998029682A1/en active Application Filing
- 1997-05-22 AT AT97921510T patent/ATE204368T1/en not_active IP Right Cessation
- 1997-05-22 EP EP97921510A patent/EP0974026B1/en not_active Expired - Lifetime
- 1997-05-22 DE DE69706198T patent/DE69706198D1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| YU69996A (en) | 1998-11-05 |
| EP0974026A1 (en) | 2000-01-26 |
| WO1998029682A1 (en) | 1998-07-09 |
| ATE204368T1 (en) | 2001-09-15 |
| DE69706198D1 (en) | 2001-09-20 |
| YU48898B (en) | 2002-10-18 |
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