CA1076514A - Method for removing a vinyl halide from polyvinyl halide-containing slurry - Google Patents
Method for removing a vinyl halide from polyvinyl halide-containing slurryInfo
- Publication number
- CA1076514A CA1076514A CA247,376A CA247376A CA1076514A CA 1076514 A CA1076514 A CA 1076514A CA 247376 A CA247376 A CA 247376A CA 1076514 A CA1076514 A CA 1076514A
- Authority
- CA
- Canada
- Prior art keywords
- slurry
- gas
- halide
- polyvinyl
- vinyl
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F6/00—Post-polymerisation treatments
- C08F6/001—Removal of residual monomers by physical means
- C08F6/003—Removal of residual monomers by physical means from polymer solutions, suspensions, dispersions or emulsions without recovery of the polymer therefrom
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Detergent Compositions (AREA)
Abstract
METHOD FOR REMOVING A VINYL HALIDE
FROM POLYVINYL HALIDE-CONTAINING SLURRY
Abstract of the Disclosure A method for removing a vinyl halide, e.g.
vinyl chloride, from a polyvinyl halide-containing slurry is disclosed. Briefly, the method comprises injecting a gas, e.g. nitrogen, into the slurry followed by removal of the gas along with vinyl halide.
FROM POLYVINYL HALIDE-CONTAINING SLURRY
Abstract of the Disclosure A method for removing a vinyl halide, e.g.
vinyl chloride, from a polyvinyl halide-containing slurry is disclosed. Briefly, the method comprises injecting a gas, e.g. nitrogen, into the slurry followed by removal of the gas along with vinyl halide.
Description
-~1:J 76S31 ~
The invention is in the field of removal of a vinyl halide, preferably vinyl chloride, from a polyvinyl halide-containing slurry.
Polyvinyl chloride, which is prepared by the polymerization of vinyl chloride, is one of the most useful of modern commercial plastics. Unfortunately, it is now believed that vinyl chloride in sufficient -concentration is harmful. Accordingly, much research has been done recently on reducing the amount of vinyl chloride in polyvinyl chloride and in the environment in plants manufacturing polyvinyl chloride.
One of the preferred methods for the commercial preparation of polyvinyl chloride consists - in carrying out the polymerization of vinyl chloride in an aqueous suspension. The slurry obtained from the polymerization reactor generally has a polyvinyl chloride content in the range of 20 to 60% by weight.
More usually, the polyvinyl chloride content is in the range of 30 to 50% by weight. The slurry also contains residual vinyl chloride, which is present in an amount of less than 0.1% to 5~. My invention is directed to a method of removing a substantial amount of vinyl chloride from polyvinyl chloride-water slurries. `
Briefly stated, the present invention is - 25 directed to a process for removing a vinyl halide from a polyvinyl halide-containing slurry wherein the process comprises passing a gas, as defined herein, through the slurry and thereby removing vinyl halide therefrom.
:' . , .
- - 2 - ~ ~
-~7iiiS~L
Preferably, the polyvinyl halide-containing slurry is a polyvinyl chloride-water slurry. Also, ~ preferably the gas is nitrogen.
.
Detailed Description While my invention is suitable for use with vinyl halides in general, the preferred vinyl halide is vinyl chloride. Purthermore, my invention preferably is used with water-polyvinyl chlorde slurries. The amount of vinyl chloride which is present in the slurry can vary over a wide range. Usually, the vinyl chloride ; will be present in an amount of less than 0.1% to about 5~.
For reason of simplicity, the remainder of the description will be directed to water-polyvinyl chloride slurries.
A variety of gases can be used in the practice of my invention. Examples of suitable gases include nitrogen, air, carbon dioxide, methane, natural gas ,, ~7i~5~L~
and various combinations thereof. Surprisingly, nitro-gen gives better re~ults than the other yases. Because of this, nitrogen i~ the preferred gas~
Knowing that the gases described hexeinbefore are useful in removing vinyl chloride from water-polyvinyl chloride slurriP~ any person skilled in the art can readily determine the optimum amount. Suitable and pre-erable amounts of gas to be used~ based on ~he amount o~ slurry, are in the range of about 0.1 to about 5 pounds and about 0.5 to abou~ 3 pounds, respectively, per gallon of slurry. Of course it is apparent that the to~al amount is based on the rate of blowing and the time for blowing. These features can readily be determined by those skilled in the art.
Improved re~ult~ are obtained by conducting the process with the slurry at an elevated temperature.
A suitable temperature for conduating the process is about 50 to about 100C. A preferred temperature is about 60 to about 95C.
The vinyl chloride can be recovered from the e~fluent gas by passing the gas through a scrubbing solution. Suitable solvents ~or the scrubbing solution will be readily apparent to those skilled in the art since vinyl chloride is soluble in n~merous organic solvents. The lower alcohols te.g. isopropanol) are particularly useful as the solvent in th scrubbing solution. Also, the vinyl chloride can be recovered from t~e e~fluent gas by ad~orption on acti~ated char-coal.
If de~irecl, the gas ca~ be recycled.
765~L~
In order to illustrate the nature o~ the pre-sent invention still more clearly, thP following examples will be given. It i~ to be understood, how-ever, that the invention is not to be limited to the specific conditions or details set forth in the~e : example~ except inso~ar as such limitations are spec-;~ ified in the appended claims.
Example l This example illustrates the invention using one-gallon samples of a water-polyvinyl chloride slurry containing 32 weight percent polyvinyl chloride and 540 parts per million (ppm) of vinyl chlor1de, Laboratory glassware was used with the gas ~ inlet being at the lower portion of the s~urry.
: 15 The rate of blowing and time of blowing were lO cfm for 60 minu~es.
The results are shown in the following table, with the slurry temperature being shown also.
' StrippingSlurry Vinyl Chloride :~ 20 GasTemp. C. in Slurry (PR~
Control - : 540 Air 66 480 , `C2 66 570 .. . N2 66 5 ~ :
This invention illustrates the invention using 50 gallon samples of a water-polyvinyl chloride slurry containing 32 weight percent polyvinyl chloride and ll,000 parts per million v:inyl chloride.
B 75-gallon reactor w-s used with the gas _ 5 _ ~ ~ 6 5~ ~
inlet being at the lower portion of the slurry.
The slurry tempe.rature was 79C.
The slurry was blown with about 10 cubic feet pex minute of each gas for 20 minutes~
The results are shown below in the following table.
Stripping Vinyl Chloride Gas Air 730 Nitrogen 330 * Calculated from vinyl chloride present in dry resin.
Example 1 and 2 show that nitrogen gives better result3 than air. This i8 believed to be sur-:: pri~ing.
While Example 1 does not show any improvement ~; 15 using CO2, it i9 belie~ed that und~r other conditions : -C2 would give improved results.
; Thus, having described the invention in detail, it will be understood b~ those skilled in the art that certain variations and modifications may be made without departing from ~he spirit and scope : of the invention as defined herein and in the appended claims.
I c laim:
, .
. .
The invention is in the field of removal of a vinyl halide, preferably vinyl chloride, from a polyvinyl halide-containing slurry.
Polyvinyl chloride, which is prepared by the polymerization of vinyl chloride, is one of the most useful of modern commercial plastics. Unfortunately, it is now believed that vinyl chloride in sufficient -concentration is harmful. Accordingly, much research has been done recently on reducing the amount of vinyl chloride in polyvinyl chloride and in the environment in plants manufacturing polyvinyl chloride.
One of the preferred methods for the commercial preparation of polyvinyl chloride consists - in carrying out the polymerization of vinyl chloride in an aqueous suspension. The slurry obtained from the polymerization reactor generally has a polyvinyl chloride content in the range of 20 to 60% by weight.
More usually, the polyvinyl chloride content is in the range of 30 to 50% by weight. The slurry also contains residual vinyl chloride, which is present in an amount of less than 0.1% to 5~. My invention is directed to a method of removing a substantial amount of vinyl chloride from polyvinyl chloride-water slurries. `
Briefly stated, the present invention is - 25 directed to a process for removing a vinyl halide from a polyvinyl halide-containing slurry wherein the process comprises passing a gas, as defined herein, through the slurry and thereby removing vinyl halide therefrom.
:' . , .
- - 2 - ~ ~
-~7iiiS~L
Preferably, the polyvinyl halide-containing slurry is a polyvinyl chloride-water slurry. Also, ~ preferably the gas is nitrogen.
.
Detailed Description While my invention is suitable for use with vinyl halides in general, the preferred vinyl halide is vinyl chloride. Purthermore, my invention preferably is used with water-polyvinyl chlorde slurries. The amount of vinyl chloride which is present in the slurry can vary over a wide range. Usually, the vinyl chloride ; will be present in an amount of less than 0.1% to about 5~.
For reason of simplicity, the remainder of the description will be directed to water-polyvinyl chloride slurries.
A variety of gases can be used in the practice of my invention. Examples of suitable gases include nitrogen, air, carbon dioxide, methane, natural gas ,, ~7i~5~L~
and various combinations thereof. Surprisingly, nitro-gen gives better re~ults than the other yases. Because of this, nitrogen i~ the preferred gas~
Knowing that the gases described hexeinbefore are useful in removing vinyl chloride from water-polyvinyl chloride slurriP~ any person skilled in the art can readily determine the optimum amount. Suitable and pre-erable amounts of gas to be used~ based on ~he amount o~ slurry, are in the range of about 0.1 to about 5 pounds and about 0.5 to abou~ 3 pounds, respectively, per gallon of slurry. Of course it is apparent that the to~al amount is based on the rate of blowing and the time for blowing. These features can readily be determined by those skilled in the art.
Improved re~ult~ are obtained by conducting the process with the slurry at an elevated temperature.
A suitable temperature for conduating the process is about 50 to about 100C. A preferred temperature is about 60 to about 95C.
The vinyl chloride can be recovered from the e~fluent gas by passing the gas through a scrubbing solution. Suitable solvents ~or the scrubbing solution will be readily apparent to those skilled in the art since vinyl chloride is soluble in n~merous organic solvents. The lower alcohols te.g. isopropanol) are particularly useful as the solvent in th scrubbing solution. Also, the vinyl chloride can be recovered from t~e e~fluent gas by ad~orption on acti~ated char-coal.
If de~irecl, the gas ca~ be recycled.
765~L~
In order to illustrate the nature o~ the pre-sent invention still more clearly, thP following examples will be given. It i~ to be understood, how-ever, that the invention is not to be limited to the specific conditions or details set forth in the~e : example~ except inso~ar as such limitations are spec-;~ ified in the appended claims.
Example l This example illustrates the invention using one-gallon samples of a water-polyvinyl chloride slurry containing 32 weight percent polyvinyl chloride and 540 parts per million (ppm) of vinyl chlor1de, Laboratory glassware was used with the gas ~ inlet being at the lower portion of the s~urry.
: 15 The rate of blowing and time of blowing were lO cfm for 60 minu~es.
The results are shown in the following table, with the slurry temperature being shown also.
' StrippingSlurry Vinyl Chloride :~ 20 GasTemp. C. in Slurry (PR~
Control - : 540 Air 66 480 , `C2 66 570 .. . N2 66 5 ~ :
This invention illustrates the invention using 50 gallon samples of a water-polyvinyl chloride slurry containing 32 weight percent polyvinyl chloride and ll,000 parts per million v:inyl chloride.
B 75-gallon reactor w-s used with the gas _ 5 _ ~ ~ 6 5~ ~
inlet being at the lower portion of the slurry.
The slurry tempe.rature was 79C.
The slurry was blown with about 10 cubic feet pex minute of each gas for 20 minutes~
The results are shown below in the following table.
Stripping Vinyl Chloride Gas Air 730 Nitrogen 330 * Calculated from vinyl chloride present in dry resin.
Example 1 and 2 show that nitrogen gives better result3 than air. This i8 believed to be sur-:: pri~ing.
While Example 1 does not show any improvement ~; 15 using CO2, it i9 belie~ed that und~r other conditions : -C2 would give improved results.
; Thus, having described the invention in detail, it will be understood b~ those skilled in the art that certain variations and modifications may be made without departing from ~he spirit and scope : of the invention as defined herein and in the appended claims.
I c laim:
, .
. .
Claims (8)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A process for removing vinyl halide from a polyvinyl halide-containing slurry wherein the process comprises passing a gas selected from the group consisting of air, nitrogen, carbon dioxide, natural gas, methane and mixtures thereof through the slurry and thereby removing vinyl halide therefrom.
2. The process of Claim 1 wherein the polyvinyl halide containing slurry is a water-polyvinyl chloride slurry.
3. The process of Claim 2 wherein the amount of gas passed through the slurry is in the range of about 0.1 to about 5 pounds per gallon of slurry.
4. The process of Claim 3 wherein the gas is air.
5. The process of Claim 3 wherein the gas is nitrogen.
6. The process of Claim 3 wherein the temperature of the slurry is in the range of about 50 to about 100°C.
7. The process of Claim 6 wherein the gas is air.
8. The process of Claim 6 wherein the gas is nitrogen.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US58845175A | 1975-06-19 | 1975-06-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1076514A true CA1076514A (en) | 1980-04-29 |
Family
ID=24353905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA247,376A Expired CA1076514A (en) | 1975-06-19 | 1976-03-08 | Method for removing a vinyl halide from polyvinyl halide-containing slurry |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS52991A (en) |
| BE (1) | BE839320A (en) |
| CA (1) | CA1076514A (en) |
| DE (1) | DE2608753A1 (en) |
| FR (1) | FR2314926A1 (en) |
| GB (1) | GB1487820A (en) |
| NO (1) | NO760661L (en) |
| SE (1) | SE7602354L (en) |
| ZA (1) | ZA761361B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52147689A (en) * | 1976-06-02 | 1977-12-08 | Mitsui Toatsu Chem Inc | Continuous removal of unreacted vinyl chloride monometer |
| JPS57148638A (en) * | 1981-03-10 | 1982-09-14 | Sumitomo Rubber Ind Ltd | Tyre loading device |
| JPS5838141A (en) * | 1981-09-01 | 1983-03-05 | Mitsubishi Heavy Ind Ltd | Tire loading apparatus of tire vulcanizer |
| JPH02169603A (en) * | 1988-12-23 | 1990-06-29 | Toyo Eng Corp | Purification of polymer dispersion |
| DE60237990D1 (en) * | 2001-11-05 | 2010-11-25 | Zeon Corp | A POLYMER PARTICLE DISPERSION AND TONER PRODUCTION METHOD |
| EP2915821A1 (en) | 2014-03-04 | 2015-09-09 | Synthomer Ltd. | Method of treating a poly(vinyl chloride) composition with dense phase carbon dioxide |
-
1976
- 1976-02-25 SE SE7602354A patent/SE7602354L/en unknown
- 1976-02-27 NO NO760661A patent/NO760661L/no unknown
- 1976-03-02 GB GB8365/76A patent/GB1487820A/en not_active Expired
- 1976-03-03 JP JP51022301A patent/JPS52991A/en active Pending
- 1976-03-03 DE DE19762608753 patent/DE2608753A1/en active Pending
- 1976-03-03 FR FR7606044A patent/FR2314926A1/en active Granted
- 1976-03-05 ZA ZA761361A patent/ZA761361B/en unknown
- 1976-03-08 BE BE164957A patent/BE839320A/en unknown
- 1976-03-08 CA CA247,376A patent/CA1076514A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| SE7602354L (en) | 1976-12-20 |
| ZA761361B (en) | 1977-10-26 |
| FR2314926B3 (en) | 1978-12-01 |
| BE839320A (en) | 1976-09-08 |
| NO760661L (en) | 1976-12-21 |
| DE2608753A1 (en) | 1977-01-13 |
| GB1487820A (en) | 1977-10-05 |
| JPS52991A (en) | 1977-01-06 |
| FR2314926A1 (en) | 1977-01-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |