Ethere sources, industrial

It is done as follows To the crystals which have been rinsed off with ether and returned to a cleaned, dry 2000 ml round bottom flask, he adds just enough hot petroleum ether to dissolve the crystals. This takes in the neighborhood of 700 ml of petroleum ether. Tiny type of petroleum ether will do. If he has access to hexane from some industrial source, that will do fine. Petroleum ether is flammable, so the way he makes the ether hot is to place the flask with the crystals into a pan of hot water, and to begin adding the petroleum ether to it. He swirls it around while adding the petroleum ether and keeps adding ether until the crystals are dissolved. 

ORIGIN/INDUSTRY SOURCES/USES synthetic organic chemical manufacture of anesthetics, sedatives, cellulose ethers copolymer of 95% ethyl acrylate with 5% 2-chloroethyl vinyl ether has been used to produce acrylic elastomer no longer produced in the USA... 

While discussing ethers we should mention that the presence of unreacted anisoles or methyl anisoles is highly undesirable in the manufacture of phenol-formaldehyde resoles. These materials tend to be unreactive relative to phenol under normal resole conditions. They are also volatile and have odors detectable at very low concentrations. They have been the source of worker complaints and costly claims in the wood products industry. Benzophenones and methyl phenyl ketones are also common phenol contaminants that are problematic in this regard. 

Sites near industrial areas in the Ebro have been found to have the highest concentration of priority contaminants [15, 47—49], while dispersion of agricultural products by drift, runoff and drainage has resulted in residues being found in ground-waters, rivers, coastal waters and lakes far from point sources [50]. Priority contaminants in aquatic environments include persistent organic pollutants (POPs) such as dichlorodiphenylethylenes (DDT) and polybrominated diphenyl ethers (PBDEs). 

Fuel octane number, 72 392, 395 Fuel oil, as a petroleum product, 78 669 Fuel oil additives amine oxides, 2 473 fatty amines, 2 534 Fuel properties, of ethers, 70 574 Fuel sources, chemical industry, 70 136 Fuel spills, hydrazine, 73 588 Fuels production, hydrocracking for, 76 842-844 Fuel sulfur, 70 54... 

The other polyethyleneglycol compounds (no. 63-71) are also industrial chemicals which are specific to a single source and which are traceable to that source. Identification of 1,2-bis (2-chloroethoxy) ethane in the river water near Philadelphia initiated a search for a possible source. According to the 1974 U.S. Tariff Commission Report (10), one of the companies in the area is the sole commercial producer of this compound, and holds a patent for its production (28). Similarity, l-(2-chlorethoxy) 2-phenoxy-ethane, bis (2-chloroethyl) ether, and compounds 68,69, and 70 are produced or patented by the same company. 

Figure 2.15 Examples of important industrially and/or environmentally relevant chemicals exhibiting either alcohol or ether functionalities. Some of the common uses and/or sources of the chemicals are given in parentheses.

PROPANE. [CAS 74-98-6], CH3 -CH2 CH3, formula weight 44.09, colorless gas. mp -187.1°C, by -42.2°C. sp gr 0.585 fat -45°C). The gas is slightly soluble in H 0. moderately soluble in alcohol, and very soluble in ether. Although a number of organic compounds which are important industrially may be considered to be derivatives of propane, it is not a common starting ingredient. Tlie content of propane in natnial gas varies with the source of the natural gas, but on the average is about 6%. Propane also is obtainable from petroleum sources,... 

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