Assertion: ethylene glycol | /r/HasProperty | contaminated with alkaline terephthalate salt
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Source sentences:
text: Process for purifying ethylene glycol contaminated with an alkaline terephthalate salt, aldehyde polymer and ethylene glycol reaction products which comprises diluting the contaminated ethylene glycol with water, acidifying the aqueous ethylene glycol solution with a suflicient amount of a mineral acid selected from the group consisting of sulphuric acid, phosphoric acid, and hydrochloric acid to precipitate out soluble solid matter including the alkaline terephthalate salt as free terephthalic acid, removing the precipitated solid matter from the acidified aqueous ethylene glycol solution, substantially dehydrat-
text: Process for purifying ethylene glycol contaminated with an alkaline terephthalate salt which comprises diluting the contaminated ethylene glycol with water to form a solution of substantially 4 parts ethylene glycol to one part water by weight, acidifying the solution with a mineral acid selected from the group consisting of sulphuric acid, phosphoric acid, and hydrochloric acid to a pH value of about 2 to precipitate out of solution the alkaline terephthalate salts in the form of free terephthalic acid, removing the precipitated terephathlic acid and any other precipitated solid matter from the acidified aqueous ethylene glycol solution, distilling off substantially all the water in the precipitate-free, acidic aqueous ethylene glycol solution, neutralizing the dehydrated ethylene glycol to a pH value between 7.0 and 8.0 and then distilling the neutralized ethylene glycol.
text: Process for purifying ethylene glycol contaminated with an alkaline terephthalate salt, which comprises diluting ethylene glycol containing an alkaline terephthalate salt with water in a ratio of one part by weight of ethylene glycol to between 0.1 and 0.5 part water, acidifying the aqueous solution with a sufiicient amount of sulphuric acid to cause precipitation of the alkaline terephthalate salt as free terephthalic acid then removing the precipitated terephthalic acid from the acidified aqueous ethylene glycol, substantially dehydrating the precipitate-free aqueous ethylene glycol solution while maintained under acidic conditions, neutralizing the dehydrated ethylene glycol and distilling the neutralized ethylene glycol.
text: Process for purifying ethylene glycol contaminated with an alkaline terephthalate salt, aldehyde polymer and ethylene glycol reaction products which comprises diluting the contaminated ethylene glycol with water in amount between 10 and 50 percent by weight of the ethylene glycol, acidifying the aqueous ethylene glycol solution with a sufiicient amount of a mineral acid selected from the group consisting of sulphuric acid, phosphoric acid, and hydrochloric acid to precipitate out soluble solid matter including the alkaline terephthalate salt as free terephthalic acid, removing the precipitated solid matter from the acidified aqueous ethylene glycol solution, substantially dehydrating the precipitate-free, aqueous ethylene glycol solution, while maintained under acidic conditions to hydrolize high boiling acetal impurities to lower boiling materials which distill azeotropically with water, neutralizing the dehydrated ethylene glycol and distilling the neutralized ethylene glycol.
text: Process for purifying ethylene glycol contaminated with an alkaline terephthalate salt which comprises diluting the contaminated ethylene glycol with water to form a solution of substantially 4 parts ethylene glycol to one part water by weight, acidifying the solution with a mineral acid selected from the group consisting of sulphuric acid, phosphoric acid, and hydrochloric acid to a pH value of about 2 to precipitate out of solution the alkaline terephthalate salts in the form of free terephthalic acid, removing the precipitated terephthalic acid and any other precipitated solid matter from the acidified aqueous ethylene glycol solution, distilling ofi substantially all the Water in the precipitate-free, acidic aqueous ethylene glycol solution, neutralizing the dehydrated ethylene glycol to a pH value between 7.0 and 8.0 and then distilling the neutralized ethylene glycol.