CS224825B1 - The production of the sodium salt of 2-aqptobenzotinol - Google Patents
The production of the sodium salt of 2-aqptobenzotinol Download PDFInfo
- Publication number
- CS224825B1 CS224825B1 CS234882A CS234882A CS224825B1 CS 224825 B1 CS224825 B1 CS 224825B1 CS 234882 A CS234882 A CS 234882A CS 234882 A CS234882 A CS 234882A CS 224825 B1 CS224825 B1 CS 224825B1
- Authority
- CS
- Czechoslovakia
- Prior art keywords
- mercaptobenzothiazole
- solution
- naoh
- added
- sodium salt
- Prior art date
Links
Landscapes
- Thiazole And Isothizaole Compounds (AREA)
Abstract
Vynálezóm je sposob výroby 20 až 50 % roztoku sodnej soli 2-merkaptobenztiazolu význačný tým, že 2-merkaptobenztiazol vo formě produktu, mokrého koláča, alebo taveniny sa neutralizuje v roztoku hydroxidu sodného alebo uhličitanu sodného pri zvýšenej teplote.The invention is a method for producing a 20 to 50% solution of the sodium salt of 2-mercaptobenzothiazole, characterized in that 2-mercaptobenzothiazole in the form of a product, wet cake, or melt is neutralized in a solution of sodium hydroxide or sodium carbonate at an elevated temperature.
Description
-k' 224 825 2-merkaptobenztiazol sa vyrába róznymi spósobmi. V priemysel-nom meradle Je najpoužívanejším postupom výroby 2-merkaptobenztiazo-lu vysokotlaková reakcia anilínu so sírouhlíkom a sírou /US pat. 1 631 871, ZSSR pat. 179 306, NSR pat. 1 919 420/. Získává sa taveni-na obsahujúca 85 až 90 % hmotn. účinnéj látky, pričom sa 2-merkapto-benztiazol takto připravený čistí reakciou technickej taveniny, NaOHalebo Ca/OH/2» Získává sa alkalická sol' 2-merkaptobenztiazolu, alebovápenatá so! 2-merkaptobenztiazolu v koncentrácii 3 až 12 % hmotn,hlavně v koncentrácii 8 % hmotn.224,825 2-mercaptobenzothiazole is produced in various ways. On an industrial scale, the most widely used process for producing 2-mercaptobenzothiazole is the high pressure reaction of aniline with carbon disulphide and sulfur (US Pat. 1,631,871, USSR Pat. 179,306, NSR Pat. 1,919,420). A melt containing 85 to 90 wt. the 2-mercapto-benzothiazole thus prepared is purified by reaction of the technical melt, NaOH or Ca / OH / 2. An alkali salt of 2-mercaptobenzothiazole is obtained, but the calcium salt is obtained. 2-mercaptobenzothiazole at a concentration of 3 to 12 wt.%, Mainly at a concentration of 8 wt.
Podl’a doposial' známých postupov sa příprava sodnej, draselnéjalebo vápenatej solí uskutečňuje z dovodu čistenia technickej tave-niny 2-merkaptobenztiazolu, pričom ich koncentrácia nepřevyšuje 12 %hmotn. Po okyselení týchto roztokov sa získává 2-merkaptobenztiazol.According to the known processes, the preparation of the sodium, potassium or calcium salts is carried out by purifying the technical melt of 2-mercaptobenzothiazole, the concentration of which does not exceed 12% by weight. After acidification of these solutions, 2-mercaptobenzothiazole is obtained.
Podlá ČSAO 168 884 sa rafinuje tavenina 2-merkaptobenztiazoluextrakciou 2 až 7 % roztokom NH^, pričom sa získává 3 až 8,4 % roztokamonnej soli 2-merkaptobenztiazolu. Takto připravený roztok sa poextrakcii org. rozpúšťadlom za spoluposobenia H2O2 áalej okyselujea získává sa 2-merkaptobenztiazol. AO 184 052 popisuje sposob výroby sulfenamidov z amonných roz-tokov 2-merkaptobenztiazolu, pričom sa používajú 5 až 15 % roztokyNE5 soli 2-merkaptobenztiazolu.According to CSA 168 884, the melt is refined with 2-mercaptobenzothiazolextraction with a 2-7% NH 4 solution, yielding 3 to 8.4% of a solution of the ammonium salt of 2-mercaptobenzothiazole. The solution thus prepared is extracted after extraction of the org. with the solvent co-operating with H 2 O 2 further acidifying to give 2-mercaptobenzothiazole. AO 184 052 discloses a process for the preparation of sulfenamides from 2-mercaptobenzothiazole ammonium solutions using 5-15% solution of 2-mercaptobenzothiazoleNE5 salt.
Obdobné i USA pat. 144 652 používá na přípravu sulfenamidov8 až 11 % alkalických roztokov 2-merkaptobenztiazolu.Similarly, U.S. Pat. 144 652 uses 8 to 11% alkaline 2-mercaptobenzothiazole solutions for the preparation of sulfenamides.
Podlá ČSAO 209 595 sa připravuje pri teplote 40°C 20 až 25 %roztok amonnej soli 2-merkaptobenztiazolu, tak, že sa 2-merkapto-benztiazol extrahuje zo surověj taveniny 2-merkaptobenztiazolu zriededým vodným roztokom aminu. Přípravou a využitím vápenatej soli 2-merkaptobenztiazolu sazaoberajú ČSAO 113 006, NSR 1 940 364, pričom koncentrácia vápenatejsoli nepřesiahla 10 % hmotn. Přípravou a využitím sodnéj soli, hlavně pri výrobě sulfenami-dov alebo pri rafinácii 2-merkaptobenztiazolu sa zaoberajú: ČSAO 114 693, US pat. 2 191 657, US pat. 2 268 467, US pat. 2 762 814NSR 855 564, Angl. pat. 642.597, Angl. pat. 665 668, pričom koncen-trácia připravovanéj a používanéj sodnéj soli 2-merkaptobenztiazolusa pohybovala v rozsahu 3 až 15 % hmotn. 224 825According to CSO 209 595, a 20-25% solution of 2-mercaptobenzothiazole ammonium salt is prepared at 40 ° C by extracting 2-mercapto-benzothiazole from the crude 2-mercaptobenzothiazole melt with a dilute aqueous amine solution. The preparation and utilization of the calcium salt of 2-mercaptobenzothiazole comprises CSA 113 006, NSR 1 940 364, wherein the calcium concentration does not exceed 10% by weight. The preparation and use of the sodium salt, mainly in the production of sulfenamides or in the refining of 2-mercaptobenzothiazole, are discussed in: CSA 114 693, US Pat. No. 2,191,657, U.S. Pat. No. 2,268,467, U.S. Pat. 2 762 814NSR 855 564, Eng. pat. 642.597, Eng. pat. 665,668, wherein the concentration of the sodium salt of 2-mercaptobenzothiazole is about 3 to 15% by weight. 224 825
Nevýhodou dosial’ zaužívaných postupov Je, že v rámci procesurafinácie technickéJ taveniny, ako aj pri používaní, sa pripravu-Jú sodné soli 2-merkaptobenztiazolu v nízkej koncentrácii max. 8 až 15 %.The disadvantage of conventional methods is that sodium 2-mercaptobenzothiazole salts are prepared at a low concentration of max. 8 to 15% in the process of refining the technical melt as well as in use.
Predmetom předloženého vynálezu Je spósob výroby sodněJ soli2-merkaptobenztiazolu o koncentrácii 20 až 50 % hmotn. neutralizá-ciou bud technického produktu 2-merkaptobenztiazolu obsahujúceho90 - 96 % 2-merkaptobenztiazolu, alebo mokrého koláča 2-merkapto-benztiazolu obsahujúcu 83 - 93 % 2-merkaptobenztiazolu hydroxidomsodným. Na neutralijzáciu možno použit' i uhličitan sodný. Je vý-hodné použit’ na neutralizáciu merkaptobenztiazolu nasýtené roztokyNaOH alebo ^£00^, za spolupósobenia tepla. Neutralizácia sa usku-točňuje za miešania pri teplote 40 až 70 °C.It is an object of the present invention to provide a sodium salt of 2-mercaptobenzothiazole having a concentration of 20 to 50% by weight. by neutralizing either the technical product of 2-mercaptobenzothiazole containing 90-96% of 2-mercaptobenzothiazole, or a wet cake of 2-mercapto-benzothiazole containing 83-93% of 2-mercaptobenzothiazole by hydroxycarbonate. Sodium carbonate may also be used for neutralization. It is preferable to use saturated NaOH or Na 2 O 3 solutions to neutralize mercaptobenzothiazole, with heat co-action. Neutralization is carried out with stirring at 40 to 70 ° C.
Proces neutralizácie možno uskutočniť diškontínuálne, alebokontinuálně. Ak sa volí diskontinuálny postup, možno do predlože-nej vody nadávkovat' šupinkový NaOH alebo tuhý ^£00^ dalej sa te-plota zvýši na 30-45 °C a začne sa za miešania přidávat' 2-merkaptobeztiazol. Po ukončení pridávania a rozpúšťania sa Na-sol 2-merkaptobenztiazolu ochladí na teplotu 20 °C, připadne sa nariedi na požadová-nu teplotu. Výhodou postupu podlá vynálezu je možnost přípravy 20-50 %roztoku Na-soli 2-merkaptobenztiazolu.The neutralization process can be carried out in a discrete manner, but in a continuous manner. If a discontinuous process is chosen, flaky NaOH or solids can be added to the present water and the temperature is raised to 30-45 ° C and 2-mercaptobenzothiazole is added with stirring. Upon completion of the addition and dissolution, the 2-mercaptobenzothiazole Na-salt is cooled to 20 ° C, optionally diluted to the desired temperature. An advantage of the process according to the invention is the possibility of preparing a 20-50% solution of 2-mercaptobenzothiazole Na-salt.
Predmet vynálezu dokumentujú příklady prevedenia, ktoré všaknevyčerpájú jeho rozsah. Příklad 1 224 825The subject matter of the present invention illustrates examples of embodiments that do not exhaust its scope. Example 1 224 825
Do 100 ml dvojhrdlej banky opatrenej miešadlom a teplomerom sanadávkovalo 453 ml vody, ktorá sa vyhriala na teplotu 40-60°C,áalej sa za miešania přidalo 64 g šupinkového NaOH, pridávanietrvalo 10 minút. Roztok NaOH sa vyhrial na teplotu 50-60°C a zamiešania sa přidávalo postupné 237 g technického 2-merkaptobenz-tiazolu obsahujúceho 96 % účinnej látky. Pridávanie trvalo 25 min.Po dávkovaní 2-merkaptobenztiazolu sa zmes miešala cca 90 min.pri uvedenej teplote, peičom došlo k úplnému rozpusteniu 2-mer-kaptobenztiazolu. Po rozpuštění 2-merkaptobenztiazolu sa získa-ný žitočervený roztok pozvolna ochladil na 20 °C a podrobil *saanalýze: obsah 2-merkaptobenztiazolu bol 29,53 % hmotn., obsah volného NaOH bol 3,2 g Na0H/l, pH 12. Příklad 2Into a 100 mL two-necked flask equipped with a stirrer and a thermometer, 453 mL of water was heated to 40-60 ° C, 64 g of flaky NaOH was added with stirring, and added for 10 minutes. The NaOH solution was heated to 50-60 ° C and 237 g of technical 2-mercaptobenzothiazole containing 96% of the active ingredient was added sequentially. The addition took 25 min. After the 2-mercaptobenzothiazole was metered in, the mixture was stirred for about 90 min at the indicated temperature, completely dissolving the 2-mercaptobenzothiazole. After dissolution of the 2-mercaptobenzothiazole, the resulting reddish-red solution was slowly cooled to 20 ° C and subjected to analysis: the 2-mercaptobenzothiazole content was 29.53% by weight, the free NaOH content was 3.2 g NaOH / l, pH 12. Example 2
Do trojhrdlej banky opatrenej teplomerom a miešadlom sa nadávkovalo370 ml vody a za miešania sa obsah vody vyhrial na 40-50°C, pricomsa súčasne začalo pridávanie šupinkového NaOH. 77 g šupinkového NaOH sa přidalo za 10 minút, po jeho rozpuštěnísa teplota roztoku vyhriala na 50-60°C a začalo sa pridávanie303 g technického 2-merkaptobenztiazolu obsahujúceho 97 % hmotn.účinnej látky. 2-merkaptobenztiazol sa přidával po 20 g po 5 min.370 ml of water were metered into a three-necked flask equipped with a thermometer and stirrer, and the water content was heated to 40-50 ° C with stirring while the addition of flaky NaOH was started. 77 g of flaky NaOH was added in 10 minutes, after dissolution, the temperature of the solution was heated to 50-60 ° C and the addition of 303 g of technical 2-mercaptobenzothiazole containing 97% by weight of the active ingredient was started. 2-mercaptobenzothiazole was added after 20 g for 5 min.
Po dávkovaní celého množstva 2-merkaptobenztiazolu rozpúšťaniepri uvedenej teplote prebiehalo za miešania 120 minút. Získal sasýtočervený roztok Na-soli 2—merkaptobenztiazolu, ktorý sa ochladilna 20°C a podrobil sa analýze: obsah 2-merkaptobenztiazólu 39,45 % hmotn., obsah volného NaOH 4,2 gNaOH/1. Příklad 3 224 825After dosing the entire amount of 2-mercaptobenzothiazole by dissolution at the indicated temperature, 120 minutes were maintained under stirring. Obtained an anasulite solution of 2-mercaptobenzothiazole Na-salt, which was cooled to 20 ° C and subjected to analysis: 2-mercaptobenzothiazole content 39.45 wt.%, Free NaOH content 4.2 g NaOH / 1. Example 3 224 825
Do 1 000 ml trojhrdlej banky opatrenej miešadlom a teplomerom,sa nadávkovalo 455 ml- vody, do ktorej sa přidalo 468 g uhličitanusodného, áalej sa zmes za miešania vyhriala na 60°C a za miešaniasa přidalo 240 g technického 2-merkaptobenztiazolu obsahujúceho95 % účinné^ látky. Pridávanie trvalo 60 minút, áalej sa za mie-šania při teplote 65 až 70 °C přidalo postupné 100 g uhličitanusodného. Rozpúšťanie trvalo 80 minút, pričom došlo k úplnémurozpusteniu 2-merkaptobenztiazolu. Získaný roztok po ochladenídosahoval 29,3 % hmotn. 2-merkaptobenztiazolu. Příklad 4 V příklade 4 sa postupovalo ako v příklade 1., pričom namiestotechnického 2-merkaptobenztiazolu sa přidávalo postupné ďo rozto-ku NaOH pri teplote 60°C 247 g taveniny 2-merkaptobenztiazolu ob-sahujúcej 89 % účinnéj látky. Získaný roztok účinnéj látky hnedočervený obsahoval 29,7 % hmotn.2-merkaptobenztiazolu a 1,8 g Na0H/l. Příklad 5To a 1000 ml three-necked flask equipped with a stirrer and a thermometer, 455 ml of water was charged into which 468 g of carbonate was added, the mixture was heated to 60 ° C with stirring, and 240 g of technical 2-mercaptobenzothiazole containing 95% active was added with stirring. substances. The addition was continued for 60 minutes, followed by the addition of successive 100 g of carbonate under stirring at 65-70 ° C. The dissolution lasted for 80 minutes, whereby the 2-mercaptobenzothiazole was completely dissolved. The obtained solution reached 29.3% by weight after cooling. 2-mercaptobenzothiazole. EXAMPLE 4 Example 4 was followed as in Example 1, with the addition of 2-mercaptobenzothiazole, 247 g of 2-mercaptobenzothiazole melt containing 89% of active ingredient, at 60 ° C. The brown-red solution obtained contained 29.7% by weight of 2-mercaptobenzothiazole and 1.8 g of NaOH / l. Example 5
Do 1 000 ml trojhrdlej banky opatrenej miešadlom a teplomerom sanadávkovalo 200 ml vody, ktorá sa vyhriala na teplotu 40-45°C,áalej sa za miešania přidalo 64 g šupinkového NaOH, pridávanietrvalo 8 minút. Roztok NaOH sa vyhrial na teplotu 50-60°C a zamiešania sa přidalo postupné 487 g mokrého koláča technického2-merkaptobenztiazolu obsahujúceho 31,35 % vlhkosti, zbytok tvořil2-merkaptobenztiazol, ktorého čistota bola 95,3 %. Pridávanie tr-valo 40 minút. Po nadávkovaní sa zmes miešala 90 minút pri teplo-te 60°C, pričom došlo k úplnému rozpusteniu 2-merkaptobenztiazolu.Roztok sa analyzoval: obsahoval 29»1 % hmotn. 2-merkaptobenztiazolu obsah volného NaOH bol 2,8 g Na0H/l.In a 1000 ml three-necked flask equipped with a stirrer and a thermometer, 200 ml of water was heated to 40-45 ° C and 64 g of flaky NaOH was added with stirring, and added for 8 minutes. The NaOH solution was heated to 50-60 ° C and 487 g wet technical 2-mercaptobenzothiazole cake containing 31.35% moisture was added by stirring, the remainder being 2-mercaptobenzothiazole having a purity of 95.3%. The addition took 40 minutes. After dosing, the mixture was stirred at 60 ° C for 90 minutes to completely dissolve the 2-mercaptobenzothiazole. Of 2-mercaptobenzothiazole free NaOH content was 2.8 g NaOH / l.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS234882A CS224825B1 (en) | 1982-04-01 | 1982-04-01 | The production of the sodium salt of 2-aqptobenzotinol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS234882A CS224825B1 (en) | 1982-04-01 | 1982-04-01 | The production of the sodium salt of 2-aqptobenzotinol |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CS224825B1 true CS224825B1 (en) | 1984-01-16 |
Family
ID=5360352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS234882A CS224825B1 (en) | 1982-04-01 | 1982-04-01 | The production of the sodium salt of 2-aqptobenzotinol |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS224825B1 (en) |
-
1982
- 1982-04-01 CS CS234882A patent/CS224825B1/en unknown
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9061976B1 (en) | Cyclic process for the production of taurine from ethylene oxide | |
| CN111620796B (en) | Cyclic process for the production of taurine | |
| US9994517B1 (en) | Method for preparing taurine | |
| US9850200B1 (en) | Method for preparing taurine | |
| US20180162806A1 (en) | Process for producing taurine | |
| CN103664717A (en) | Preparation method of cheap and environmentally friendly D, L-2- hydroxyl-4-methylthio butyric acid | |
| FR2590896B1 (en) | PROCESS FOR THE PREPARATION OF AN AQUEOUS SOLUTION OF AN ALKALINE SALT OF METHIONINE | |
| ZA200100245B (en) | Method for preparing hydroxymethylthiobutyric acid | |
| JP2018021003A (en) | Method for producing taurine | |
| US5434276A (en) | Process for making N-acyl taurides | |
| US4499028A (en) | Preparation of isethionic acid | |
| CN106977428A (en) | Improve the method for preparing lauryl sodium sulfate | |
| JPH0681742B2 (en) | Method for producing aqueous solution of sodium methionine salt | |
| EP0148353B1 (en) | Process for the preparation of uracil | |
| GB934292A (en) | Process for the preparation of heterocyclic compounds | |
| JPS54141780A (en) | 5-n-butyl-2-thiopicoline-anilide and its preparation | |
| ES532506A0 (en) | PROCEDURE TO DESENSITIZE ALIPHATIC OR AROMATIC PEROXYCARBOXYLIC ACIDS, INSOLUBLE IN WATER | |
| JPS5929655A (en) | Preparation of beta-mercaptopropionic acid | |
| CH257403A (en) | Process for the preparation of d, l-methionine. | |
| US2356710A (en) | 2-mercapto dihydro pyrimidine derivatives | |
| RO81068B (en) | Process for preparing baking soda and chlorine hydride | |
| KR820001161B1 (en) | Synthesis of Carbocysteine | |
| JPS553340A (en) | Production of readily soluble aluminum hydroxide compound and aluminum salt | |
| JPS5571607A (en) | Production of dithionite | |
| JPS61180760A (en) | Production of o-methylisourea acetic acid salt |