Xem 1-12 trên 12 kết quả Distilled water
  • Distillation is probably one of the oldest systematic processes in the field of chemistry and chemical engineering which goes back to the first century AD. The initial concepts were applied in the production of distilled water. Distillation was a single step batch process at the beginning. However, fractional distillation as is used today was developed more than 10 centuries later.

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  • Sodium metasilicate solution 60 g of sodium metasilicate and make up to 2 l with distilled water in a 2 l flask for lab up to 20 litres. Filter through 0.5 micron filter paper and use 1ml/litre of water in lab; 180g of sodium metasilicate and make up to 1 litre with distilled water Then use 200ml/2 mt tank or 650ml/6.5mt tank....

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  • Automatic sampler (optional)—The sampler must incorporate glass sample containers for the collection of a minimum of 250 mL of sample. Sample containers must be kept refrigerated at 4°C and protected from light during compositing. If the sampler uses a peristaltic pump, a minimum length of compressible silicone rubber tubing may be used. Before use, however, the compressible tubing should be thoroughly rinsed with methanol, followed by repeated rinsings with distilled water to minimize the potential for contamination of the sample.

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  • Glassware must be scrupulously cleaned. Clean all glassware as soon as possible 3 after use by rinsing with the last solvent used in it. Solvent rinsing should be followed by detergent washing with hot water, and rinses with tap water and distilled water. The glassware should then be drained dry, and heated in a muffle furnace at 400°C for 15-30 minutes. Some thermally stable materials may not be eliminated by this treatment. Solvent rinses with acetone and pesticide quality hexane may be substituted for the muffle furnace heating.

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  • This book is a revised edition of the Manual of basic techniques for a health laboratory (WHO, 1980), major revisions having been carried out by Dr K. Engbaek, Dr C.C. Heuck and Mr A.H. Moody. The revision was necessary because of new procedures and technology that have been developed since the previous edition and that have proved to be useful to small laboratories in developing countries. The procedures have been included in the relevant sections of the manual, and some obsolete procedures have been replaced by more up-to-date techniques....

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  • Vinyl chloride and polyvinyl chloride presents about company profile; the Vinnolit VCM process (EDC distillation, EDC cracking, VCM distillation, waste water treatment,...); the Vinnolit S-PVC process (Description of the S-PVC process, advantages of the S-PVC process,...).

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  • Glassware must be scrupulously cleaned. Clean all glassware as soon as 3 possible after use by rinsing with the last solvent used in it. Solvent rinsing should be followed be detergent washing with hot water, and rinses with tap water and distilled water. The glassware should then be drained dry, and heated in a muffle furnace at 400°C for 15-30 minutes. Some thermally stable materials, such as PCBs, may not be eliminated by this treatment. Solvent rinses with acetone and pesticide quality hexane may be substituted for the muffle furnace heating.

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  • Automatic sampler (optional)—The sampler must incorporate glass sample containers for the collection of a minimum of 250 mL of sample. Sample containers must be kept refrigerated at 4°C and protected from light during compositing. If the sampler uses a peristaltic pump, a minimum length of compressible silicone rubber tubing may be used. Before use, however, the compressible tubing should be thoroughly rinsed with methanol, followed by repeated rinsings with distilled water to minimize the potential for contamination of the sample.

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  • A two-gram sample was oven-dried and placed into a 250 mL Erlenmeyer flask with 100 mL of distilled water. A reflux condenser was attached to the flask and the apparatus was placed in a gently boiling water bath for three hours. Special attention was given to insure that the level of the solution in the flask remained below that of the boiling water. Samples were then removed from the water bath and filtered by vacuum suction into a fritted glass crucible of known weight. The residue was washed with hot tap water before the crucibles...

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  • A one-gram, oven-dried sample of extractive-free bamboo was placed in a 150 mL beaker. Fifteen mL of cold sulfuric acid (72 percent) was added slowly while stirring and mixed well. The reaction proceeded for two hours with frequent stirring in a water bath maintained at 20 o C. When the two hours had expired, the specimen was transferred by washing it with 560 mL of distilled water into a 1,000 mL flask, diluting the concentration of the sulfuric acid to three percent. An allihn condenser was attached to the flask. The apparatus was placed in...

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  • A three gram oven-dried sample of holocellulose was placed in a 250 mL Erlenmeyer flask with a small watch glass cover. The flasks were placed into water bath that was maintained at 20 o C. The sample was then treated with 50 mL of 17.5 percent NaOH and thoroughly mixed for one minute. After the specimen was allowed to react with the solution for 29 minutes, 50 mL of distilled water was added and mixed well for another minute. The reaction continued for five more minutes. The contents of the flask were filtered by aid of...

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  • The chemistry of fine organic intermediates and products shows an enormous diversity. But in reality, the number of operations/processes used remains reasonably small. These include charging/discharging of reactants and solvents, inertisation, reactions, crystallisations, phase separations, filtrations, distillation, product washing. In many cases cooling, heating, or the application of vacuum or pressure is necessary. The unavoidable waste streams are treated in recovery/abatement systems or disposed of as waste.

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