NL7800344A - Inhibiting polymerisation of conjugated diene in polar solvents - at high temps., by addn. of an aliphatic tert. mercaptan as polymerisation inhibitor - Google Patents
Inhibiting polymerisation of conjugated diene in polar solvents - at high temps., by addn. of an aliphatic tert. mercaptan as polymerisation inhibitorInfo
- Publication number
- NL7800344A NL7800344A NL7800344A NL7800344A NL7800344A NL 7800344 A NL7800344 A NL 7800344A NL 7800344 A NL7800344 A NL 7800344A NL 7800344 A NL7800344 A NL 7800344A NL 7800344 A NL7800344 A NL 7800344A
- Authority
- NL
- Netherlands
- Prior art keywords
- polymerisation
- polar solvents
- mercaptan
- tert
- addn
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/20—Use of additives, e.g. for stabilisation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Water Supply & Treatment (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The tendency of conjugated dienes such as butadiene, isoprene, 1,3-pentadiene, etc. to polymerise in polar solvents at elevated temps. is reduced by incorporating an aliphatic tert. mercaptan (I) as polymerisation inhibitor. Process is esp. useful for preventing polymerisation of the raw materials during extractive distn. of C4 or C5 hydrocarbon streams using polar solvents such as DMF, N-methylpyrrolidone, acetonitrile or acetone. Suitable inhibitors (I) have the formula: CH3(CH2)n-C(CH3)2SH where n = 1-10. (I) are used e.g. at 0.01-10 wt.% on the solvent, opt. together with known inhibitors such as NaNO2, methylene blue, sulphur, tert. butyl catechol, beta-naphthylamine, furfural, benzaldehyde or aromatic nitro cpds. (I) give improved inhibition of conjugated dienes at elevated temps. in the presence of polar solvents, even in the presence of acetylene cpds. and satd. hydrocarbons.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7800344.A NL162351C (en) | 1967-04-26 | 1978-01-11 | METHOD FOR REDUCING THE TENDING OF A CONJUGGED DIE TO POLYMERIZE IN A POLAR SOLVENT. |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2624367 | 1967-04-26 | ||
NL6805773.A NL159358B (en) | 1967-04-26 | 1968-04-24 | METHOD OF REDUCING THE TENDENCE OF A CONJUGATED DIES TO POLYMERIZE. |
NL7800344.A NL162351C (en) | 1967-04-26 | 1978-01-11 | METHOD FOR REDUCING THE TENDING OF A CONJUGGED DIE TO POLYMERIZE IN A POLAR SOLVENT. |
Publications (3)
Publication Number | Publication Date |
---|---|
NL7800344A true NL7800344A (en) | 1978-04-28 |
NL162351B NL162351B (en) | 1979-12-17 |
NL162351C NL162351C (en) | 1980-05-16 |
Family
ID=26363984
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NL7800344.A NL162351C (en) | 1967-04-26 | 1978-01-11 | METHOD FOR REDUCING THE TENDING OF A CONJUGGED DIE TO POLYMERIZE IN A POLAR SOLVENT. |
Country Status (1)
Country | Link |
---|---|
NL (1) | NL162351C (en) |
-
1978
- 1978-01-11 NL NL7800344.A patent/NL162351C/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
NL162351B (en) | 1979-12-17 |
NL162351C (en) | 1980-05-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
V1 | Lapsed because of non-payment of the annual fee |