SU16664A1 - The method of obtaining benzidine sulfate, free from impurities of lead salts - Google Patents
The method of obtaining benzidine sulfate, free from impurities of lead saltsInfo
- Publication number
- SU16664A1 SU16664A1 SU12066A SU16664DA SU16664A1 SU 16664 A1 SU16664 A1 SU 16664A1 SU 12066 A SU12066 A SU 12066A SU 16664D A SU16664D A SU 16664DA SU 16664 A1 SU16664 A1 SU 16664A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- impurities
- obtaining
- free
- lead
- sulfate
- Prior art date
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Вследствие перехода в раствор свинца из обкладки освинцованных чанов, получаемый в технике бензидин-сульфат обычно содержит вредную дл производства некоторых азокрасителей примесь сернокислого свинца, понижающую выход красител и измен; ЮЩую его оттенок. Отделение свинца от бензидии-сульфата представл ет, однако, р д затруднений, вследствие трудной растворимости # воде сернокислого свинца и заметной раствог римости этой соди в присзп-ствии сол ной кислоты и хлористых солей.As a result of transition to lead solution from leaded vats lining, benzidine sulfate obtained in the technique usually contains an admixture of lead sulphate, harmful for the production of some azo dyes, which reduces the dye yield and changes; Watch his shade. The separation of lead from benzidium sulfate, however, presents a number of difficulties due to the difficult solubility of lead sulfate and the noticeable solution of this acid in hydrochloric acid and chloride salts.
Предлагаемый способ в удалении свинца во врем , или лучше после окончани реакции перегруппировки гидра .зобензола прибавлением в слабый сол нокислый раствор цинковой пыли до исчезновени в котрольной пробе фильтрата (с сернистым аммонием), реакции на свинец . Процесс лучше всего протекает при повышенной температуре. Свинец выдел етс в течение короткого времени и несмотр на кислую реакцию среДы, обратно в раствор не переходит. Из отфильтрованного раствораосаждениесернокислог бензидина производ т обычным способом. Полученный в результате такой обработки бензидин-сульфат ц едставл ет белый продукт, диазотирз ощийс нацело, дава совершенно прозрачны : раствор.,.The proposed method for the removal of lead during, or better after, the end of the rearrangement of hydrazobenzene by adding zinc dust to a weak hydrochloric acid solution until the filtrate (with ammonium sulphide) disappears from the control sample and reacts to lead. The process proceeds best at elevated temperatures. Lead is released in a short time and, despite the acidic reaction, does not go back into solution. From the filtered solution of precipitation, benzidine sulphate is produced in the usual way. The benzidine sulfate c obtained as a result of this treatment represents the white product, which completely diazotizers, giving a completely transparent: solution.
Предмет патента.The subject of the patent.
Способ получени бензидин-сульфата,. свободного от примесей СВИНЦОВЕЛХ солей,отличающийс тем, что во врем или после операции перегруппировки гидразобензола удал ют свинец из сол ан6кислого раствора путем прибавлени небольшого количества цинковой пыли,, после чего из фильтрата осаждают бензидин-сульфат обычным способом.The method of producing benzidine sulfate. lead-free salt of impurities, characterized in that during or after the operation of the rearrangement of hydrazobenzene lead is removed from the hydrochloric acid solution by adding a small amount of zinc dust, after which benzidine sulfate is precipitated from the filtrate in the usual way.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU16664T | 1926-09-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
SU16664A1 true SU16664A1 (en) | 1930-09-30 |
Family
ID=51098807
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU12066A SU16664A1 (en) | 1926-09-13 | 1926-09-13 | The method of obtaining benzidine sulfate, free from impurities of lead salts |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU16664A1 (en) |
-
1926
- 1926-09-13 SU SU12066A patent/SU16664A1/en active
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