CA2074501A1 - Treatment of aqueous acrylic solutions and mixtures - Google Patents
Treatment of aqueous acrylic solutions and mixturesInfo
- Publication number
- CA2074501A1 CA2074501A1 CA 2074501 CA2074501A CA2074501A1 CA 2074501 A1 CA2074501 A1 CA 2074501A1 CA 2074501 CA2074501 CA 2074501 CA 2074501 A CA2074501 A CA 2074501A CA 2074501 A1 CA2074501 A1 CA 2074501A1
- Authority
- CA
- Canada
- Prior art keywords
- acid
- mixture
- process according
- acrylic
- weight
- 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.)
- Abandoned
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
- C08F6/06—Treatment of polymer solutions
- C08F6/12—Separation of polymers from solutions
Abstract
TREATMENT OF AQUEOUS ACRYLIC SOLUTIONS
AND MIXTURES
ABSTRACT
Liquid waste streams containing solutions of mixtures of acrylic polymers are hazardous waste. In this invention the acrylic polymers are separated from the aqueous solution or mixture by adjusting the pH of the solution or mixture.
The separated acrylic polymers being solid can be disposed of separately from the remaining aqueous solution or mixture.
AND MIXTURES
ABSTRACT
Liquid waste streams containing solutions of mixtures of acrylic polymers are hazardous waste. In this invention the acrylic polymers are separated from the aqueous solution or mixture by adjusting the pH of the solution or mixture.
The separated acrylic polymers being solid can be disposed of separately from the remaining aqueous solution or mixture.
Description
A. FIELD OF T~E INVENTION
The present invention rel~es to a process f~r trea-ti~g aqueou solutions or mixtures of acrylic polymers by ` adjusting the pH of the mixture or solution so that the .~ acrylic polymers are precipitated from the mixture or solution.
, ~s : B. BACNROUND OF THE INVENTION
:
~ isp~sal of the aqueous acrylic polymer solutions or mixtures has historically ~een performed in two ways. 1) It has been diluted and sewered. With increased environmental 1~ c~ncerns this option is no longer acceptable in many areas~
The present invention rel~es to a process f~r trea-ti~g aqueou solutions or mixtures of acrylic polymers by ` adjusting the pH of the mixture or solution so that the .~ acrylic polymers are precipitated from the mixture or solution.
, ~s : B. BACNROUND OF THE INVENTION
:
~ isp~sal of the aqueous acrylic polymer solutions or mixtures has historically ~een performed in two ways. 1) It has been diluted and sewered. With increased environmental 1~ c~ncerns this option is no longer acceptable in many areas~
2):Waste treatment firms have degraded the solutions or mixtures either chemically or bioligically. The ~acilities : required for such treatment of the wa~te is expensive and is reflected in the disposal cosit.
Rothman et al. in Canadlan patent 1 238 146 describes method for separating polyacrylic acids from aqueous ,t,~:,." :''`"':`'`: ''ii; ~ ' ; i 2 ~
solu-tions by modifyinc~-the p~ of the so:lu-tion and ~ubsequ~ntly ~dsorbing the acid. This pro~ess dj.ffers undamentally from the process ob-tained from -this in~en-tion, The object of modi~ying the pEI in the pro~ess des~ribed by Rothman et al. is to charlge the lonisat.ion of the aeid so that it can be adsorbed~ Precipitation of the polymer is not taught and would i~telfere with the adsorption of the acid.
The proces~ of precipita-ting the acrylic polymers rom the solution or mixture by modifying the p~l of th~ solution or mixture is new and has not been suggested in the techni~al literature.
.
C. SUMMARY OF THE INVENTION
. . _ The present invention provides a process for separa-ting the acrylic polymers from the aqueous solution or mixture in which they are contained. The process comprises: 1~ adding an acid in the range from 0~01 to 100 weight perc~nt basPd on the w~ight oE the acrylic polyme~/ 2~ adding a .1 flocculating agent, surfac-tant or other chemical to modi~y the n~ture of the precipitated mass; and 3) separ~ting the ~, precipitated ma~ by filtration, decantation, centrifu~ation ;.1 or similar proce~s~
1 Aqueou~ solutions or mixtures of acrylic polymers are ;~3~ frequently used to make acrylic ~ilms~ For example, in the ~i~ printing indu~try a layer of an acrylic polymer solution or mixture is applied over the printed matter. The printed matter with wet acrylic overcoating is dried so that a glosæ-iike film i~ produced over the printed matter.
! Howe~er, wa~te water streams containin~ acryli~ polymer solu~ion.~ or mixtures is a hazardous waste. Disposal of uch waste stream is expensive. Thi~ invention change~ ~he ~1 . ~ :
'! :
(, ~ : ~ :
. ' ~ .
~ ~ 7 ~
physi~al state of the acrylic w~ste fr~m a solution o~
mixture to an insoluble 501icl. ~nder current regulations, as an i.n~oluble solid, it i~ a non-hazarclouici waste.
Probably the most com~on a~rylic polym~r is the polym~rized ester o~ methyl methacrylate. The present invention is not limited to solutions o.r mixtures o:E methyl methaicrylate polymers, but applies to any acrylic polymer~
Naturally, if such acryli~ poly~er solu~ions or mixtures contain in~redients ~hich are to~ic or hazardous, the waste stream which contain~i tho~io toxic or hazardous ingredients i.s toxic or hazardousO
D. _ETAILED DESCRIPTION
To the aqu ous solution or rnixture of acryli~ polymers the flocculating agent, sur~actan-t or other chemical ~any chemical desired which influence~ the precipitation of the acryli.c polymer3~ is added in the quantity required to achei~e the desired effects. Flocculating ag~nts and surfactants are usually ad~ed in quanti$i~s ranging ~rom 0.001 to 20 weight percent bacied on the weight o~ acrylic polymer in the s~lution or mixture, and preferably in quantities ranging from 0.01 to 10%, and even more prePerably in quantities ranging ~rom 0.01 to 3%. The soluti.on or mixture is well ~itirred to ensure proper distribution of the chemicals added ~
i I ~ After addition of on~ or more of the chemicals liited ~:~ above, an acid i~ added to precipitate the acrylic polym~r.
~: ~ The acid used can be from the category of either mineral cr organic acid~. Preferably an organic acid is used and of the organic acidi~ acetic acidi is preferred. The amount of ~7~
acid to be ~dded depenclis on -~he c~Jmposltion oE -the isolu-~ion or mixture, on the type of ac~ylic polymer p~esen-t and on the acid chosen. Typically, when using acetic acid, between .01 and 100 weicJh-t percent basecl on the weight of acrylic polymer is added, and preferably less -than 50~, and even more preferably between 0.1 and 10%o After addition of the acicl a white precipitate is observed. The precipita-te can be removed from the solu-tion or mixture by filtering with a fast filter paper.
Al-ternately the solution or mixture can be decantecl leaving the precipitate in the reaction container. The precipitate is of a nature that it can easily be separated from the solution or mixture using solid/liq~icl separating methods well known in the ~rt.
Accepta~le re~ults were obtained when proce~sing according to the examples tabllla-ted below:
E~Ie 1 i i A~ aqueous mixture containing short to meclium chainecl acrylic polymers was obtained from a printing plantc The mixture is used by the printing plant as a water based overcoat. The mixture was analyised and containecl 54%
acrylic by weightO The mixture was opaque, white and had a vi~cosity of approximatly 500cps.
About ~50 mls of the solution was treatecl with 250 mls o 5% acetic acid. A separation occured i~mediatly i following the addition of the acid. The precipitate was gravity filterecl and driecl~ Once dry it was in the ~orm of a single white and solid mass. Analysis of the liquid and of the precipit~te showed that 100~ of the acrylic polymer ~ wa~ recovered.
1 ~;
~ E~a~le 2 _ _ To the sarne aqu~ouZ3 mixture aZ3 in example 1~ 041% hasecl on the weight of the acrylic polymer of sodium lauryl sulphate was added. The same amount of the same acid was subsequently added. The yield was the sa~e, and a loo~er product was obtained after drying than in example 1.
Example 3 A polyacrylate known under the trade name C~lsize VR
and manufactured by Allied Colloids WciS diZ~Zsolved at 10%
:` sZolids in water. The viscosity was about aocps. To 250 mls of the polyacrylate Z~olution 25d mls ~f 5% acetic acid waZ~
added. The precipitate was reco~ered in the same fashion as ~l in example l-Example 4 Using the Zs7lame aqueous mixture as in example 1, 0.5~, based on the weight of acrylate, of sodium stearate was J adAed, The Zsame amount of the Z3ame aZicid as in example 1 were added~ The results were the same as for e~ample 2.
le S
,~ ; : Following the ~Zame proceaure as in example l, the Z~ : acetic acid was replaced with 100 mis of 2% ~Cl. The resultZs obtained were the same as in sample 1.
~Z~
Rothman et al. in Canadlan patent 1 238 146 describes method for separating polyacrylic acids from aqueous ,t,~:,." :''`"':`'`: ''ii; ~ ' ; i 2 ~
solu-tions by modifyinc~-the p~ of the so:lu-tion and ~ubsequ~ntly ~dsorbing the acid. This pro~ess dj.ffers undamentally from the process ob-tained from -this in~en-tion, The object of modi~ying the pEI in the pro~ess des~ribed by Rothman et al. is to charlge the lonisat.ion of the aeid so that it can be adsorbed~ Precipitation of the polymer is not taught and would i~telfere with the adsorption of the acid.
The proces~ of precipita-ting the acrylic polymers rom the solution or mixture by modifying the p~l of th~ solution or mixture is new and has not been suggested in the techni~al literature.
.
C. SUMMARY OF THE INVENTION
. . _ The present invention provides a process for separa-ting the acrylic polymers from the aqueous solution or mixture in which they are contained. The process comprises: 1~ adding an acid in the range from 0~01 to 100 weight perc~nt basPd on the w~ight oE the acrylic polyme~/ 2~ adding a .1 flocculating agent, surfac-tant or other chemical to modi~y the n~ture of the precipitated mass; and 3) separ~ting the ~, precipitated ma~ by filtration, decantation, centrifu~ation ;.1 or similar proce~s~
1 Aqueou~ solutions or mixtures of acrylic polymers are ;~3~ frequently used to make acrylic ~ilms~ For example, in the ~i~ printing indu~try a layer of an acrylic polymer solution or mixture is applied over the printed matter. The printed matter with wet acrylic overcoating is dried so that a glosæ-iike film i~ produced over the printed matter.
! Howe~er, wa~te water streams containin~ acryli~ polymer solu~ion.~ or mixtures is a hazardous waste. Disposal of uch waste stream is expensive. Thi~ invention change~ ~he ~1 . ~ :
'! :
(, ~ : ~ :
. ' ~ .
~ ~ 7 ~
physi~al state of the acrylic w~ste fr~m a solution o~
mixture to an insoluble 501icl. ~nder current regulations, as an i.n~oluble solid, it i~ a non-hazarclouici waste.
Probably the most com~on a~rylic polym~r is the polym~rized ester o~ methyl methacrylate. The present invention is not limited to solutions o.r mixtures o:E methyl methaicrylate polymers, but applies to any acrylic polymer~
Naturally, if such acryli~ poly~er solu~ions or mixtures contain in~redients ~hich are to~ic or hazardous, the waste stream which contain~i tho~io toxic or hazardous ingredients i.s toxic or hazardousO
D. _ETAILED DESCRIPTION
To the aqu ous solution or rnixture of acryli~ polymers the flocculating agent, sur~actan-t or other chemical ~any chemical desired which influence~ the precipitation of the acryli.c polymer3~ is added in the quantity required to achei~e the desired effects. Flocculating ag~nts and surfactants are usually ad~ed in quanti$i~s ranging ~rom 0.001 to 20 weight percent bacied on the weight o~ acrylic polymer in the s~lution or mixture, and preferably in quantities ranging from 0.01 to 10%, and even more prePerably in quantities ranging ~rom 0.01 to 3%. The soluti.on or mixture is well ~itirred to ensure proper distribution of the chemicals added ~
i I ~ After addition of on~ or more of the chemicals liited ~:~ above, an acid i~ added to precipitate the acrylic polym~r.
~: ~ The acid used can be from the category of either mineral cr organic acid~. Preferably an organic acid is used and of the organic acidi~ acetic acidi is preferred. The amount of ~7~
acid to be ~dded depenclis on -~he c~Jmposltion oE -the isolu-~ion or mixture, on the type of ac~ylic polymer p~esen-t and on the acid chosen. Typically, when using acetic acid, between .01 and 100 weicJh-t percent basecl on the weight of acrylic polymer is added, and preferably less -than 50~, and even more preferably between 0.1 and 10%o After addition of the acicl a white precipitate is observed. The precipita-te can be removed from the solu-tion or mixture by filtering with a fast filter paper.
Al-ternately the solution or mixture can be decantecl leaving the precipitate in the reaction container. The precipitate is of a nature that it can easily be separated from the solution or mixture using solid/liq~icl separating methods well known in the ~rt.
Accepta~le re~ults were obtained when proce~sing according to the examples tabllla-ted below:
E~Ie 1 i i A~ aqueous mixture containing short to meclium chainecl acrylic polymers was obtained from a printing plantc The mixture is used by the printing plant as a water based overcoat. The mixture was analyised and containecl 54%
acrylic by weightO The mixture was opaque, white and had a vi~cosity of approximatly 500cps.
About ~50 mls of the solution was treatecl with 250 mls o 5% acetic acid. A separation occured i~mediatly i following the addition of the acid. The precipitate was gravity filterecl and driecl~ Once dry it was in the ~orm of a single white and solid mass. Analysis of the liquid and of the precipit~te showed that 100~ of the acrylic polymer ~ wa~ recovered.
1 ~;
~ E~a~le 2 _ _ To the sarne aqu~ouZ3 mixture aZ3 in example 1~ 041% hasecl on the weight of the acrylic polymer of sodium lauryl sulphate was added. The same amount of the same acid was subsequently added. The yield was the sa~e, and a loo~er product was obtained after drying than in example 1.
Example 3 A polyacrylate known under the trade name C~lsize VR
and manufactured by Allied Colloids WciS diZ~Zsolved at 10%
:` sZolids in water. The viscosity was about aocps. To 250 mls of the polyacrylate Z~olution 25d mls ~f 5% acetic acid waZ~
added. The precipitate was reco~ered in the same fashion as ~l in example l-Example 4 Using the Zs7lame aqueous mixture as in example 1, 0.5~, based on the weight of acrylate, of sodium stearate was J adAed, The Zsame amount of the Z3ame aZicid as in example 1 were added~ The results were the same as for e~ample 2.
le S
,~ ; : Following the ~Zame proceaure as in example l, the Z~ : acetic acid was replaced with 100 mis of 2% ~Cl. The resultZs obtained were the same as in sample 1.
~Z~
Claims (29)
1. A process in which the acrylic polymers are precipitated from an aqueous solution or mixture by a chemical, where the precipitated acrylic polymers can be easily removed from the solution or mixture by filtering, decanting of centrifuging.
2. The process according to claim 1 where the chemical is an acid.
3. The process according to claim 2 where the acid is a mineral acid or a mixture of mineral acids.
4. The process according to claim 3 where the acid or acid mixture is present from 0.01 to 100 weight percent based on the weight of acrylic.
5. The process according to claim 4 where the mineral acid is one of or a mixture of: hydrogen chloride, sulfuric acid, nitric acid, or phosphoric acid.
6. The process according to claim 5 where the acid is hydrogen chloride.
7. The process according to claim 6 where the acid is present in the amount from 0.1 to 20 weight percent based on the weight of acrylic.
8. The process according to claim 5 where the acid is a mixture of 50% hydrogen chloride and 50% sulfuric acid.
9. The process according to claim 8 where the acid mixture is present from .1 to 20 weight percent based on the weight of acrylic.
10. The process according to claim 2 where the acid is an organic acid or a mixture of organic acids.
11. The process according to claim 10 where the organic acid or the mixture of organic acids is present in the amount from 0.01 to 100 weight percent based on the weight of acrylic.
12, The process according to claim 11 where the organic acid is one of or a mixture of: acetic acid, formic acid, proprionic acid, carboxylic acid, or carbonic acid.
13. The process according to claim 12 where the organic acid is acetic acid.
14, The process according to claim 13 where the acid is present in the amount from 0.1 to 20 weight percent based on the weight of acrylic.
15. The process according claim 12 where the acid is a mixture of 50% acetic acid and 50% carboxylic acid.
16. The process according to claim 15 where the acid mixture is present in the amount from 0.1 to 20 weight percent based on the weight of acrylic.
17. The process according to claim 2 where the acid is a mixture of mineral and organic acids.
18. The process according to claim 17 where the mixture of acids is present in the amount from 0.01 to 100 weight percent based on the weight of acrylic.
19. The process according to claim 18 where the acid is a mixture of one or several of: hydrogen chloride, sulfuric acid, nitric acid, or phosphoric acid and of one or several of acetic acid, formic acid, proprionic acid, carboxylic acid, or carbonic acid.
20. The process according to claim 19 where the acid is a mixture of 50% hydrogen chloride and 50% acetic acid.
21. The process according to claim 20 where the acid mixture is present in the amount from 0.1 to 20 weight percent based on the weight of acrylic.
220 The process as defined in claim 1 where the solution or mixture is treated with a chemical prior to being precipitated.
23. The process according to claim 22 where the chemical is a flocullating agent or surfactant.
24. The process according to claim 23 where the flocullating agent or surfactant is present in the amount from 0.001 to 20 weight percent based on the weight of acrylic.
25. The process according to claim 24 where the flocullating agent or surfactant is sodium lauryl sulfate.
26. The process according to claim 24 where the flocullating agent or surfactant is sodium stearate.
27. The process according to claim 22 where the chemical is a mixture of flocculating agents or a mixture of surfactants or of flocculating agents and surfactants.
28. A process according to claim 27 where the mixture is present from 0.001 to 20 weight percent on the basis of acrylic polymer.
29. A process according to claim 28 where the mixture is composed of 50% sodium lauryl sulfate and 50% sodium stearate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2074501 CA2074501A1 (en) | 1992-07-24 | 1992-07-24 | Treatment of aqueous acrylic solutions and mixtures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2074501 CA2074501A1 (en) | 1992-07-24 | 1992-07-24 | Treatment of aqueous acrylic solutions and mixtures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2074501A1 true CA2074501A1 (en) | 1994-01-25 |
Family
ID=4150195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2074501 Abandoned CA2074501A1 (en) | 1992-07-24 | 1992-07-24 | Treatment of aqueous acrylic solutions and mixtures |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2074501A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6011176A (en) * | 1998-01-30 | 2000-01-04 | Basf Aktiengesellschaft | Using anionic flocculants for organic-aqueous phase separation |
-
1992
- 1992-07-24 CA CA 2074501 patent/CA2074501A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6011176A (en) * | 1998-01-30 | 2000-01-04 | Basf Aktiengesellschaft | Using anionic flocculants for organic-aqueous phase separation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |