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Hydrochloric acid was added to the hot filtrate until reaching pH 2.
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For studies in cells, however, the hot water filtrate was freeze-dried for 72 h in the Savant refrigerated vapor trap (RVT4104-180) tobtainin a dried powdered plant extract.
A mixture of 1 (0.01 mol) and triethyl orthoformate and/or diethyl oxalate (0.01 mol) in xylene (25 mL) in the presence of sodium metal (0.50 g), was heated under reflux for 4 h, then filtered upon hot and the filtrate then concentrated, cooled and the solid formed was filtered off, dried and purified by crystallization from ethanol to give 12 and 13, respectively.
The results indicate that 10.8 MW of heat from stack gases can be reused to heat process streams such as the deaerator water, hot water, drying filtrates, and black liquor.
The precipitate was dissolved in 100 ml (iodo derivative: 250 ml) hot water and filtrated.
The mixture was filtered while hot and the cooled filtrate made alkaline to litmus paper with 20% sodium hydroxide solution.
The insoluble matter was collected on an ashless filter paper (Whatmann number 41) and washed with hot water until the filtrate was neutral.
The resulting solution was filtrated while hot, followed by the removal of solvent.
Afterwards, the samples were thoroughly washed and rinsed using vacuum filtration with hot distilled water to remove all the excess acid until the pH of the filtrate was approximately 7. The samples were then dried in the oven at a temperature of 110 °C for 24 h.
Also, the relationships between filtrate volume and filtration time for these two drilling fluids (after hot-rolling) were investigated.
The filtrate was washed with hot water until pH 7 and kept in the oven at 40 °C for 6 h.
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