Propyl Gallate → N-Methylmorpholine N-oxide monohydrate

Temperature

95 °C

Approximately 1073 grams of tertiary amine oxide such as N-methylmorpholine-N-oxide in water (76% NMMO, 24% H2O), 16 g of cellulose (DP=625, 5% moisture content) and 1.5 g stabilizer, e.g., gallic acid propyl ester, are prepared in a container and heated to above 72° C. This solution is stirred for approximately 15 minutes and about 100 g of water is then separated under vacuum. After water removal step a clear cellulose solution is obtained. Alternatively, 554 g of NMMO/water mixture (83% NMMO), 0.8 g stabilizer and 11.3 g cellulose are prepared in a container and heated to approx. 95° C. while being stirred simultaneously. After approximately 30 to 60 minutes a cellulosic solution is obtained. In this procedure it is no longer necessary to separate the water.

1. temperatureheated to above 72° C
2. customabout 100 g of water is then separated under vacuum
3. customAfter water removal step a clear cellulose solution
4. customis obtained
5. stirringwhile being stirred simultaneously
6. customAfter approximately 30 to 60 minutes a cellulosic solution is obtained
7. customto separate the water

ORD record

ord-327afafa28be46f48bac69d0f7a3da87

Source dataset

uspto-grants-2003_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06528165B2