5613-46-7Relevant articles and documents
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Curtis
, p. 415 (1962)
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Preparation method of tetramethyl bisphenol A
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Paragraph 0008; 0014-0033, (2021/05/15)
The invention discloses a preparation method of tetramethyl bisphenol A. The preparation method comprises the following steps: 1) mixing 2, 6-dimethylphenol, acetone, a main catalyst, an auxiliary catalyst and a mixed solvent to obtain a reaction solution, and reacting the reaction solution at 20-60 DEG C until the reaction is finished; (2) adding a hydrophobic solvent into the reaction liquid, performing heating and dissolving, separating out an oil layer, adjusting the pH value of the oil layer to be neutral, and performing washing until the conductivity is less than 50 mu S/cm; 3) cooling the oil layer treated in the step 2) to obtain tetramethyl bisphenol A crystal mush, and performing cooling, centrifuging, washing, drying and discharging to obtain tetramethyl bisphenol A; (4) treating the crystallization mother liquor in the step (3), recovering excessive and unreacted raw material 2, 6-dimethylphenol, adding a hydrophobic solvent into the remaining residues, and repeating the steps (2)-(3) to obtain the tetramethyl bisphenol A. The method disclosed by the invention is low in impurity conversion rate and high in product purity, and realizes low emission of the preparation process.
BISPHENOL COMPOSITION CONTAINING AROMATIC ALCOHOL SULFONATE AND METHOD FOR PRODUCING SAME, POLYCARBONATE RESIN AND METHOD FOR PRODUCING SAME, AND BISPHENOL PRODUCTION METHOD
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Paragraph 0288, (2020/07/07)
A bisphenol composition including a specific amount of aromatic alcohol sulfonate, and a simple method of producing it are provided. Also provided is a method of producing a polycarbonate resin in which, by using the bisphenol composition including a specific amount of aromatic alcohol sulfonate, melt polymerization reaction can be efficiently allowed to proceed to produce a polycarbonate resin having an excellent color tone. A bisphenol composition including an aromatic alcohol sulfonate at not less than 0.1 ppb by mass with respect to a bisphenol. A method of producing a bisphenol composition, including reacting a ketone or an aldehyde with an aromatic alcohol in the presence of sulfuric acid to produce a bisphenol composition. A method of producing a polycarbonate resin, including producing a polycarbonate resin using the bisphenol composition. A polycarbonate resin including a specific amount of aromatic alcohol sulfonate.
Preparation method of high-purity tetramethyl bisphenol A
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Paragraph 0051-0054, (2020/01/12)
The invention discloses a preparation method of high-purity tetramethyl bisphenol A. The preparation method of the high-purity tetramethyl bisphenol A comprises the following steps: 1) in a reactor, heating 2,6-xylenol to a molten state, then adding an organic carboxylic acid catalyst, and mixing and stirring; 2) continuing to add an organic sulfonic acid catalyst, then adding acetone, and carrying out a reaction to obtain slurry; 3) transferring the slurry to a kneading machine, and stirring to obtain a paste product; and 4) transferring the paste product to a stirrer, adding an organic solvent, washing and filtering, and drying the obtained solid product. The preparation method provided by the invention can be used for obtaining high-purity and high-yield tetramethyl bisphenol A with thepurity of more than 98.5% and the yield of more than 75%, and has a wide application prospect.