| Patent application number | Description | Published |
|---|
| 20100249453 | Removing hydrocarbon impurities from acetic acid production intermediate - A method for removing hydrocarbon impurities from an acetic acid production intermediate is disclosed. The method comprises extracting the intermediate with a hydrocarbon extracting agent. The extraction is preferably performed with the alkane distillation bottom stream which comprises methyl iodide, acetic acid, and hydrocarbon impurities. The extraction forms a light phase which comprises the hydrocarbon impurity and the extracting agent and a heavy phase which comprises methyl iodide and acetic acid. The extraction heavy phase is optionally recycled to the alkane distillation or to the carbonylation reaction. | 09-30-2010 |
| 20110087047 | Vinyl acetate production process - A process for the production of vinyl acetate is disclosed. The process comprises reacting ethylene, acetic acid, and oxygen in the presence of a catalyst to produce a reaction mixture comprising vinyl acetate, ethylene, carbon dioxide, acetic acid and ethylene glycol diacetate. The reaction mixture is separated to a gas stream comprising ethylene, oxygen, and carbon dioxide and a crude vinyl acetate stream comprising vinyl acetate, acetic acid and ethylene glycol diacetate. An ethylene glycol diacetate stream, which comprises at least 50 wt % of ethylene glycol diacetate, is isolated from the crude vinyl acetate stream and hydrolyzed to recover acetic acid. Recovered acetic acid may be recycled to the acetoxidation reaction. | 04-14-2011 |
| 20110101233 | Method for quantifying permanganate-reducing compounds - A method for quantifying the permanganate-reducing compounds (PRCs) in an acetic acid sample is disclosed. The method comprises establishing a correlation between permanganate absorbances of standard samples and their PRC contents and determining the PRC content of the acetic acid sample by measuring its permanganate absorbance of a reaction mixture containing a standard permanganate solution and the acetic acid sample. The permanganate absorbance is obtained by subtracting the manganese dioxide absorbance from the absorbance of the mixture. | 05-05-2011 |
| 20110104807 | Method for quantifying permanganate-reducing compounds - A method for quantifying the permanganate-reducing compounds (PRCs) in an acetic acid sample is disclosed. The method comprises establishing a correlation between permanganate absorbances of standard samples and their PRC contents and determining the PRC content of the acetic acid sample by measuring its permanganate absorbance of a reaction mixture containing a standard permanganate solution and the acetic acid sample. The permanganate absorbance is obtained by subtracting the manganese dioxide absorbance from the absorbance of the mixture. | 05-05-2011 |
| 20110137075 | Vinyl acetate production process - A process for the production of vinyl acetate is disclosed. The process comprises reacting ethylene, acetic acid, and oxygen in the presence of a catalyst to produce a reaction mixture comprising vinyl acetate, ethylene, carbon dioxide, acetic acid, water and ethylene glycol diacetate. The reaction mixture is separated to a gas stream comprising ethylene, and carbon dioxide and a crude vinyl acetate stream comprising vinyl acetate, acetic acid, water and ethylene glycol diacetate. An ethylene glycol diacetate stream is isolated from the crude vinyl acetate stream and subjected to a reactive distillation to recover acetic acid. | 06-09-2011 |
