SU136363A1 - The method of separation of n-and m-toluenesulfonic - Google Patents
The method of separation of n-and m-toluenesulfonicInfo
- Publication number
- SU136363A1 SU136363A1 SU663516A SU663516A SU136363A1 SU 136363 A1 SU136363 A1 SU 136363A1 SU 663516 A SU663516 A SU 663516A SU 663516 A SU663516 A SU 663516A SU 136363 A1 SU136363 A1 SU 136363A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- isomer
- toluenesulfonic
- separation
- hydrogen chloride
- isomers
- Prior art date
Links
Description
Предлагаетс способ выделении л- и м-толуолсульфокнслот из равновесной смеси о-м-п- зомеров толуо юульфокиачоты (м-изомера 54%, п-изомера 4%, о-изомера 6%). получаемой сульфированием толуола при 130-200°. Сущность способа заключаетс в следующем: через водный раствор изомерных толуолсульфокислот (поале удалени известным способом избыточной серной кислоты и частичного упаривани ) при температуре от -5 до -20° в течение трех часов пропускают сухой газообразный хлористый водород. Выкристаллизовавщийс , при этом, п-изомер отфильтровывают , а фильтрат, состо щий из раствора м-изомера с небольщой примесью о-изомера, нагревают при температуре 100° до полного удалени хлористого водорода. Полученна таким способом п-толуолсульфокислота вл етс чистой и не содержит примесей других изомеров , а толуолсульфокислота, выделенна из фильтрата, содержит около 94% м-изомера и 6% о- и п-изомера.A method is proposed for isolating l- and m-toluenesulfonic acids from an equilibrium mixture of o-m-p-isomers of toluene – sulfonic acid (m-isomer 54%, p-isomer 4%, o-isomer 6%). obtained by sulphonating toluene at 130-200 °. The essence of the method is as follows: a dry hydrogen chloride gas is passed through an aqueous solution of isomeric toluenesulfonic acids (after removal of excess sulfuric acid and partial evaporation in a known manner) at a temperature of from -5 to -20 ° C. The p-isomer that crystallizes out is filtered off, and the filtrate, consisting of a solution of the m-isomer with a small admixture of the o-isomer, is heated at a temperature of 100 ° until complete removal of hydrogen chloride. The p-toluenesulfonic acid obtained in this way is pure and does not contain impurities of other isomers, and the toluene sulfonic acid extracted from the filtrate contains about 94% of the m-isomer and 6% of the o- and p-isomers.
Предмет изобретени Subject invention
Способ разделени п- и м-толуолсульфокислот, отличающийс тем, что п-изомер выкристаллизовывают из смеси проаусканием через нее газообразного хлористого водорода при температуре от -5 до -20°, а м-изомер получают после удалени хлористого водорода нагреванием при 100.A method for separating p- and m-toluenesulfonic acids, characterized in that the p-isomer is crystallized from the mixture by passing hydrogen chloride gas through it at a temperature of from -5 to -20 ° C, and the m-isomer is obtained after removing hydrogen chloride by heating at 100.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU663516A SU136363A1 (en) | 1960-04-18 | 1960-04-18 | The method of separation of n-and m-toluenesulfonic |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU663516A SU136363A1 (en) | 1960-04-18 | 1960-04-18 | The method of separation of n-and m-toluenesulfonic |
Publications (1)
Publication Number | Publication Date |
---|---|
SU136363A1 true SU136363A1 (en) | 1960-11-30 |
Family
ID=48292646
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU663516A SU136363A1 (en) | 1960-04-18 | 1960-04-18 | The method of separation of n-and m-toluenesulfonic |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU136363A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995005361A1 (en) * | 1993-08-19 | 1995-02-23 | Leonidov Nikolai B | METHOD OF OBTAINING A PHYSICALLY STABLE CRYSTALLINE η-MODIFICATION OF PARA-AMINOBENZENE SULPHANILAMIDE |
-
1960
- 1960-04-18 SU SU663516A patent/SU136363A1/en active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995005361A1 (en) * | 1993-08-19 | 1995-02-23 | Leonidov Nikolai B | METHOD OF OBTAINING A PHYSICALLY STABLE CRYSTALLINE η-MODIFICATION OF PARA-AMINOBENZENE SULPHANILAMIDE |
US5602281A (en) * | 1993-08-19 | 1997-02-11 | Leonidov; Nikolai B. | Process for preparing physically stable crystalline gamma modification of para-aminobenzenesulfonamide |
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