- A synthetic isophthalic acid diphenyl process (by machine translation)
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The invention belongs to the field of organic synthetic technology, and in particular relates to a process for preparing phthalic acid diphenyl process. The isophthalic chloride with phenol as the main raw material, potassium carbonate as capture, dichloroethane or dichloromethane as solvent, in 10 °C to 50 °C conducted under the conditions of reaction synthesis of diphenyl-phthalic acid. The isophthalic chloride is dissolved in the solvent into the reactor at the same time add acid-binding (isophthalic chloride in solvent in the mass concentration of 8% — 15%), phenol also is dissolved in the solvent, through the dropping funnel into the reactor. Isophthalic chloride with phenol in a molar ratio of 1: 2.6 — 1: 2.0 between, potassium carbonate with the phenol in a molar ratio of 1.0: 1 - 1 .06: 1 between, to maintain the reaction 4 - 12 hours, to the reaction solution after the reaction is washed by water, liquid, distilling solvent, recrystallization and other steps, to obtain the isophthalic acid diphenyl finished product. After the distillation of the solvent recovered after drying can be recycled. (by machine translation)
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Paragraph 0015; 0016; 0017; 0018; 0019; 0020; 0021-0023
(2017/02/09)
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- Diphenyl isophthalate synthesis method with cyclohexane as solvent
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The invention relates to the field of fine chemicals, and relates to a diphenyl isophthalate synthesis method with cyclohexane as a solvent. According to the method, under the catalytic effect of a phase transfer catalyst benzyltriethylammonium chloride, with cyclohexane as a solvent, isophthaloyl chloride and phenol are subjected to a reaction; and high-purity diphenyl isophthalate is obtained through reduced-pressure distillation. With a direct esterification method, reaction is not complete, and free acid group caused adverse influence on the next step of polymerization reaction. With a transesterification method, a product is colored. In traditional production, phenol-containing wastewater is produced and is hard to treat. With the method provided by the invention, the above problems are solved. The method is safe and environment-friendly, and is suitable for industrial production. Diphenyl isophthalate provided by the invention has chromatographic content higher than 99.8%. An average reaction yield is higher than 98.70%.
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Paragraph 0013; 0014
(2016/10/27)
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- Diphenyl isophthalate synthesis method with ethanol as solvent
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The invention relates to the field of fine chemicals, and relates to a dihenyl isophthalate synthesis method with ethanol as a solvent. According to the synthesis method, under a catalytic effect of a phase transfer catalyst benzyltriethylammonium chloride and with ethanol as a solvent, isophthaloyl chloride and phenol are subjected to a reaction; and high-purity diphenyl isophthalate is obtained through reduced-pressure distillation. With a direct esterification method, a reaction is not complete, and free acid group causes adverse influence on the next step of polymerization reaction. With a transesterification method, a product is colored. In traditional productions, phenol-containing wastewater is produced and is hard to treat. With the method provided by the invention, the above problems are overcome. The method is safe and environment-friendly, and is suitable for industrial productions. The dihenyl isophthalate provided by the invention has a chromatography content above 99.8%. A reaction average yield is higher than 98.70%.
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Paragraph 0011; 0012
(2016/11/21)
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- Method for preparing diphenyl isophthalate through mixing solvent
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The present invention belongs to the technical field of organic synthesis, and particularly relates to a synthesis method for diphenyl isophthalate by using a mixing solvent. The method comprises: dissolving phenol in an organic solvent, dissolving isophthaloyl dichloride in toluene, adding the toluene solution of the isophthaloyl dichloride into the phenol at a temperature of 5-30 DEG C in a dropwise manner, carrying out a reaction, carrying out water washing on the reaction solution after completing the reaction, carrying out liquid separation, and carrying out rotary distillation solvent recovery and other steps so as to obtain the diphenyl isophthalate finished product. According to the present invention, the preparation process has advantages of easy operation, easy achieving, high finished product yield, high finished product purity, and the like.
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Paragraph 0015
(2016/10/08)
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- Synthesis of esters with aromatic structure from aromatic carboxylic acids and diphenyl carbonate
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Aromatic esters have been prepared with high to moderate yields from the corresponding aromatic carboxylic acids and diphenyl carbonate in pyridine at reflux (about 140-150 °), 5-6 hours.
- Chiriac, Constantin I.,Onciu, Marioara,Tru?can, Ioan,Mihaela, Tanasa Fulga,Bǎdǎrǎu, Cristina
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p. 1065 - 1068
(2007/10/03)
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