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US 2009/0182139 A1Published application
Process for the preparation of an n-alkyl lactam with improved colour quality
AssigneeBASF SE
InventorsTobias Wabnitz, Rolf Pinkos, Karl Ott
Life of this patent
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Abstract
A process for preparing an N-alkyllactam with improved color quality, wherein from 0.01 to 10% by weight of a C1-10-alcohol or a compound which releases from 0.01 to 10% by weight of a C1-10-alcohol is added to the N-alkyllactam. A mixture comprising at least 99.0% by weight of an N-alkyllactam and in the range from 100 to 5000 ppm by weight of a C1-10-alcohol or of an acetal, aminal or of an orthoester which releases in the range from 100 to 5000 ppm by weight of a C1-10-alcohol.
Claims17
1:
- A process for preparing an N-alkyllactam with improved color quality, which comprises adding to the N-alkyllactam from 0.01 to 10% by weight of a C1-10-alcohol or a compound which releases from 0.01 to 10% by weight of a C1-10-alcohol.
2:
- The process according to claim 1 for preparing an N-alkyl-2-pyrrolidone or N-alkyl-2-piperidone with improved color quality.
3:
- The process according to claim 1 for preparing an N—(C1-8-alkyl)-2-pyrrolidone or N—(C1-8-alkyl)-2-piperidone with improved color quality.
4:
- The process according to claim 1 for preparing N-ethyl-2-pyrrolidone (NEP), 1,5-dimethyl-2-pyrrolidone, 1-ethyl-5-methyl-2-pyrrolidone, 1-methyl-2-piperidone or N-ethyl-ε-caprolactam (NEC) with improved color quality.
5:
- The process according to claim 1, wherein the C1-10-alcohol is methanol, ethanol, n-propanol, isopropanol, n-butanol, n-pentanol, n-hexanol, n-heptanol, n-octanol, 1,2-ethylene glycol, 1,2-propanediol, 1,3-propanediol, glycerol, pentaerythritol and/or sorbitol.
6:
- The process according to claim 1, wherein the compound which releases the C1-10-alcohol is an acetal, aminal or an orthoester.
7:
- The process according to claim 1 wherein the compound which releases the C1-10-alcohol is dimethoxymethane, diethoxymethane, tetramethoxymethane, tetraethoxymethane, trimethyl orthoformate and/or triethyl orthoformate.
8:
- The process according to claim 1, wherein from 0.02 to 2% by weight of a C1-10-alcohol or a compound which releases from 0.02 to 2% by weight of a C1-10-alcohol is added to the N-alkyllactam.
9:
- The process according to claim 1, wherein from 0.03 to 1% by weight of a C1-10-alcohol or a compound which releases from 0.03 to 1% by weight of a C1-10-alcohol is added to the N-alkyllactam.
10:
- The process according to claim 1, which is performed at a temperature in the range from −20 to 400° C.
11:
- The process according to claim 1, which is performed at a temperature in the range from 10 to 250° C.
12:
- A mixture comprising at least 99.0% by weight of an N-alkyllactam and in the range from 100 to 5000 ppm by weight of a C1-10-alcohol or of an acetal, aminal or of an orthoester which releases in the range from 100 to 5000 ppm by weight of a C1-10-alcohol.
13:
- A mixture comprising at least 99.0% by weight of N-ethyl-2-pyrrolidone (NEP) and in the range from 100 to 5000 ppm by weight of methanol or 1,2-ethylene glycol.
14:
- A mixture comprising at least 99.0% by weight of N-ethyl-ε-caprolactam (NEC) and in the range from 100 to 5000 ppm by weight of methanol or 1,2-ethylene glycol.
15:
- A mixture comprising at least 99.0% by weight of 1,5-dimethyl-2-pyrrolidone and in the range from 100 to 5000 ppm by weight of methanol or 1,2-ethylene glycol.
16:
- A mixture comprising at least 99.0% by weight of 1-ethyl-5-methyl-2-pyrrolidone and in the range from 100 to 5000 ppm by weight of methanol or 1,2-ethylene glycol.
17:
- A mixture comprising at least 99.0% by weight of 1-methyl-2-piperidone and in the range from 100 to 5000 ppm by weight of methanol or 1,2-ethylene glycol.