CS274002B1 - Method of dimethylamine's aqueous solution preparation - Google Patents
Method of dimethylamine's aqueous solution preparation Download PDFInfo
- Publication number
- CS274002B1 CS274002B1 CS521986A CS521986A CS274002B1 CS 274002 B1 CS274002 B1 CS 274002B1 CS 521986 A CS521986 A CS 521986A CS 521986 A CS521986 A CS 521986A CS 274002 B1 CS274002 B1 CS 274002B1
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- CS
- Czechoslovakia
- Prior art keywords
- dimethylamine
- aqueous solution
- solution
- sodium hydroxide
- water
- Prior art date
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- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 239000007864 aqueous solution Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 7
- 238000002360 preparation method Methods 0.000 title abstract description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 34
- 239000000243 solution Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000010521 absorption reaction Methods 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 239000002253 acid Substances 0.000 abstract description 4
- 150000007513 acids Chemical class 0.000 abstract description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 3
- 239000011707 mineral Substances 0.000 abstract description 3
- 238000006386 neutralization reaction Methods 0.000 abstract description 3
- 150000007524 organic acids Chemical class 0.000 abstract description 2
- 235000005985 organic acids Nutrition 0.000 abstract description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 150000004679 hydroxides Chemical class 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 239000005574 MCPA Substances 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- WHKUVVPPKQRRBV-UHFFFAOYSA-N Trasan Chemical compound CC1=CC(Cl)=CC=C1OCC(O)=O WHKUVVPPKQRRBV-UHFFFAOYSA-N 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 150000003839 salts Chemical group 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- HPNMFZURTQLUMO-UHFFFAOYSA-N diethylamine Chemical compound CCNCC HPNMFZURTQLUMO-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
1 CS 274 002 Dl1 CS 274 002 Ref
Vynález sa týká sposobu přípravy vodného roztoku dimetylamínu, ktorý sa použije na ne-utralizáciu technickej 2-metyl-4-chlórfenoxyoctovej kyseliny.The present invention relates to a process for the preparation of an aqueous solution of dimethylamine which is used to neutralize the technical 2-methyl-4-chlorophenoxyacetic acid.
Dimetylamín za normálnych podmienok má teplotu varu 7 °C. 3e dobře rozpustný vo voděa při jeho rozpúšlaní sa uvolňuje poměrně vela tepla, ktoré je nutné odvádzaí. Při přípravěvodných roztokov absorbciou dimetylamínu vo vodě, sa vyzrážavajú vo formě jemného kalu hy-droxidy železitý, manganatý, horečnatý a pod. z kationov, ktoré sú vo vodě rozpustné vo forměsolí. Při přípravě vodných roztokov vzniklý zákal při využití vodného roztoku dimetylamínurobí problémy a z toho dóvodu sa odstráni, najčastejšie sedimentáciou, alebo filtráciou. Přivyzrážavaní hydroxidov sa část dimetylamínu spotřebuje za vzniku príslušnej soli, čo před-stavuje stratu dimetylamínu.Dimethylamine has a boiling point of 7 ° C under normal conditions. 3e is very soluble in water and releases a lot of heat which is necessary to dissolve it. Ferric, manganese, magnesium and the like are precipitated in the form of fine sludge in the preparation of the aqueous solutions by absorbing dimethylamine in water. from cations which are water soluble in the salt form. In the preparation of aqueous solutions, the turbidity produced by the use of an aqueous solution of dimethylaminoboric problems and of this reason is removed, most often by sedimentation or filtration. The precipitation of the hydroxides causes some of the dimethylamine to be consumed to form the corresponding salt, which is a loss of dimethylamine.
Vyššie uvedené nedostatky sú zmiernené spůsobom přípravy vodného roztoku dimetylamínu,podstata ktorého spočívá v tom, že sa dimetylamín absorbuje vo vodnom roztoku hydroxidu sod-ného koncentrácie 0,01 až 1 % hmot. na vodný roztok dimetylamínu. Po ukončení absorbcie saz vodného roztoku dimetylamínu odstránia nečistoty vo formě kalu, ktorý predstavujú v prevaž-nej miere hydroxidy, železitý, horečnatý, manganatý a pod., sedimentáciou alebo filtráciou.Obdobný účinok je možné dosiahnul, ak sa vodný roztok hydroxidu sodného přidá k vodnému roz-toku dimetylamínu připraveného absorbciou plynného dimetylamínu vo vodě počas absorbcie,alebo po nej. Výhodou postupu podía vynálezu je, že sa na vyzrážanie hydroxidov použije miesto di-metylamínu hydroxid sodný, ktorý je omnoho lačnější ako dimetylamín. Veími výhodné je možnépoužit roztok dimetylamínu podía vynálezu na neutralízáciu technických kyselin, ktoré obsa-hujú silnú minerálnu kyselinu, ktorej soí nevplýva na vlastnosti výrobku pri jeho využití.Například při neutralizácii technickej 2-metyl-4-chlórfenoxyoctovej kyseliny obsahujúcejako nečistotu kyselinu chlorovodíkovú sa na neutralízáciu kyseliny chlorovodíkovéj použijehydroxid sodný v dimetylamíne, ktorý je omnoho lačnější ako doteraz používaný samotný dime-tylamín. Příklad 1 Připravil sa 0,05 % hmot. vodný roztok hydroxidu sodného. Za stálého chladenia sa potomdo vodného roztoku hydroxidu sodného vháňal plynný dimetylamín. Po ukončení absorbcie savyzrážané nečistoty oddělili sedimentáciou. Získaný vodný roztok obsahoval 45,1 % hmot. di-metylamínu . Příklad 2The aforementioned drawbacks are alleviated by the process of preparing an aqueous solution of dimethylamine, wherein the dimethylamine is absorbed in an aqueous solution of sodium hydroxide at a concentration of 0.01 to 1% by weight. to an aqueous solution of dimethylamine. Upon completion of the absorption of the aqueous solution of dimethylamine, the impurities in the form of sludge, which are predominantly hydroxides, ferric, magnesium, manganese and the like, are removed by sedimentation or filtration. a solution of dimethylamine prepared by or after absorption of dimethylamine gas in water. An advantage of the process of the invention is that sodium hydroxide is used in place of the diethylamine to precipitate the hydroxides, which is much more expensive than dimethylamine. It is very advantageous to use a solution of dimethylamine according to the invention for neutralizing technical acids which contain a strong mineral acid, which does not affect the properties of the product in its use. For example, in the neutralization of technical 2-methyl-4-chlorophenoxyacetic acid containing as an impurity, hydrochloric acid is hydrochloric acid uses sodium hydroxide in dimethylamine, which is much more hungry than the previously used dimethylamine alone. Example 1 0.05 wt. aqueous sodium hydroxide solution. Dimethylamine gas was then injected into the aqueous sodium hydroxide solution while cooling. After absorption, the precipitated impurities were separated by sedimentation. The obtained aqueous solution contained 45.1 wt. dimethylamine. Example 2
Postupovalo sa podía příkladu 1 s tým rozdielom, že sa na absorbciu použil 6,9 % hmot.vodný roztok hydroxidu sodného. Získaný vodný roztok obsahoval 43,4 % hmot. dimetylamínu. Příklad 3The procedure of Example 1 was followed except that 6.9% by weight aqueous sodium hydroxide solution was used for absorption. The obtained aqueous solution contained 43.4 wt. dimethylamine. Example 3
Absorbciou plynného dimetylamínu vo vodě sa připravil 44,2 % hmot. vodný roztok dimetyl-amínu, Po absorbcii sa k 1 1 suspenzii přidalo 5 ml 43 % hmot. vodného roztoku hydroxidusodného. Po premiešaní a 1 hod. stáni sa oddělili nečistoty vo formě kalu sedimentáciou. Příklad 4By absorbing dimethylamine gas in water, 44.2 wt. an aqueous solution of dimethylamine. After absorption, 5 ml of 43 wt. aqueous sodium hydroxide solution. After stirring and standing for 1 hour, the sludge impurities were separated by sedimentation. Example 4
Postupovalo sa podía příkladu 3 s tým rozdielom, že sa hydroxid sodný přidal k zmesipočas absorbcie. Získalo sa 44,1 hmot. dimetylamínu.The procedure of Example 3 was followed, except that sodium hydroxide was added to the absorbent mixture. 44.1 wt. dimethylamine.
Vynález nájde uplatnenie při přípravě vodného roztoku dimetylamínu obsahujúceho hydroxidsodný, ktorý sa využije při neutralizácii predovšetkým organických kyselin, ktoré sú znečis-těné minerálnymi kyselinami.The invention finds application in the preparation of an aqueous solution of dimethylamine containing hydroxidesodium, which is used in the neutralization, in particular of organic acids, which are contaminated with mineral acids.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS521986A CS274002B1 (en) | 1986-07-09 | 1986-07-09 | Method of dimethylamine's aqueous solution preparation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS521986A CS274002B1 (en) | 1986-07-09 | 1986-07-09 | Method of dimethylamine's aqueous solution preparation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CS521986A1 CS521986A1 (en) | 1990-08-14 |
| CS274002B1 true CS274002B1 (en) | 1991-04-11 |
Family
ID=5396663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS521986A CS274002B1 (en) | 1986-07-09 | 1986-07-09 | Method of dimethylamine's aqueous solution preparation |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS274002B1 (en) |
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1986
- 1986-07-09 CS CS521986A patent/CS274002B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CS521986A1 (en) | 1990-08-14 |
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