Preparation method of bisphenol (polyphenol) solution in preparation of polycarbonate

A polycarbonate and preparation method technology, which is applied in the field of preparation of bisphenol solution in the process of preparing polycarbonate, can solve the problems of lowering the solution precipitation temperature, increasing side reactions, and increasing temperature, and achieves convenient and simple control of process conditions, and reduces Precipitation temperature, effect of increasing reaction productivity

Active Publication Date: 2014-09-17
WANHUA CHEM GRP CO LTD +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used measures are first to reduce the concentration of bisphenol (polyphenol) ingredients to ensure that crystals do not precipitate, but this will lead to a decline in production efficiency; The solution is oxidized, and the color number of the solution will increase, which will affect the quality of the product, and will lead to an increase in the temperature of the reaction process and an increase in side reactions.
[0004] In the prior art, it has not been found that in the preparation process of bisphenol (polyphenol) solution, the addition of composite additives is used to change the thermodynamic equilibrium condition of the solution, thereby reducing the solution precipitation temperature, and reaching the method of increasing the concentration of bisphenol (polyphenol) solution at the same temperature

Method used

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  • Preparation method of bisphenol (polyphenol) solution in preparation of polycarbonate

Examples

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Effect test

Embodiment 1

[0025]Add 3080g of water, 238g of solid sodium hydroxide and composite additives into the mixing tank to form an alkaline solution. The amount of composite additives added is: 3g of sodium chloride, 60g of methylene chloride, and then 645g of bisphenol A (BPA) is added to the solution For the powder, fully stir to dissolve, gradually lower the temperature until solid precipitates appear, and record the temperature before the precipitation. The above method was used to reconfigure the BPA sodium salt solution and control the solution temperature to 28°C. Continuously add BPA and NaOH to the BPA solution in units of 5gBPA and 1.8gNaOH until solid precipitation occurs, record the total amount of BPA added before precipitation and measure the solution color number (APHA). Using the above method, add 3080g of water, 300g of solid sodium hydroxide and composite additives into the mixing tank to form an alkaline solution. The amount of composite additives added is: 3g of sodium chlor...

Embodiment 2

[0027] Add 3080g of water, 238g of solid sodium hydroxide and compound additives into the mixing tank to form an alkaline solution. The amount of compound additives added is: 0.6g of sodium chloride and 60g of dichloromethane, and then add 645g of BPA powder into the solution and stir thoroughly Dissolve, gradually lower the temperature until solid precipitates appear, record the temperature before the precipitation. The above method was used to reconfigure the BPA sodium salt solution and control the solution temperature to 28°C. Continuously add BPA and NaOH to the BPA solution in units of 5gBPA and 1.8gNaOH until solid precipitation occurs, record the total amount of BPA added before precipitation and measure the solution color number (APHA). Using the above method, add 3080g of water, 282g of solid sodium hydroxide and composite additives into the mixing tank to form an alkaline solution. The amount of composite additives added is: 0.6g of sodium chloride, 60g of methylene...

Embodiment 3

[0029] Add 3080g of water, 240g of solid sodium hydroxide and compound additives into the mixing tank to form an alkaline solution. The amount of compound additives added is: 3g of sodium chloride and 92g of dichloromethane, and then add 650g of BPA powder into the solution, fully stir to dissolve , gradually lower the temperature until solid precipitates appear, and record the temperature before the precipitation. The above method was used to reconfigure the BPA sodium salt solution and control the solution temperature to 28°C. Continuously add BPA and NaOH to the BPA solution in units of 5gBPA and 1.8gNaOH until solid precipitation occurs, record the total amount of BPA added before precipitation and measure the solution color number (APHA). Using the above method, add 3080g of water, 298g of solid sodium hydroxide and composite additives into the mixing tank to form an alkaline solution. The amount of composite additives added is: 3g of sodium chloride and 92g of dichlorome...

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Abstract

The invention provides a preparation method of a bisphenol (polyphenol) solution in preparation of polycarbonate. The preparation method comprises the steps of: adding a composite additive in an alkali metal and / or an alkaline-earth metal hydroxide aqueous solution; then adding bisphenol (polyphenol); and stirring adequately for dissolution, thus forming the stable bisphenol (polyphenol) solution. The preparation method is simple to operate, and the precipitation temperature of the bisphenol (polyphenol) solution can be lowered through a method of changing solution thermodynamic equilibrium conditions, so that the aim of increasing the concentration of the bisphenol (polyphenol) solution at the same temperature is achieved, the productivity is effectively improved, and the cost is saved; besides, the bisphenol (polyphenol) solution prepared by the preparation method is stable and has a good colour and lustre; and the added composite additive affects neither the process of polymerization reaction nor the finished product.

Description

technical field [0001] The invention relates to a preparation method of bisphenol (polyphenol) solution in the process of preparing polycarbonate. Background technique [0002] Polycarbonate (PC) has excellent physical and chemical properties and is the second largest engineering plastic in the world after nylon. At present, the large-scale industrial production is mainly aromatic polycarbonate, and the interfacial phosgene method and the melt transesterification method are mainly used to prepare polycarbonate, among which the interfacial phosgene method occupies the mainstream of the industry. The interfacial phosgene method usually refers to the combination of phenoxide dissolved in an aqueous alkali metal hydroxide solution and an inert organic solvent such as dichloromethane in the presence of an organic acid acceptor such as an aqueous solution of an alkali metal hydroxide and a catalyst. The phosgene reacts at the interface of the oil-water two phases, and then prepar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G64/20C08G64/24
Inventor 张雷田材张宏科宋林嵘吴俊华卫琦
Owner WANHUA CHEM GRP CO LTD
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