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Process for producing granular bisphenol A

A bisphenol and phenol technology, applied in the field of preparing high-quality bisphenol A granules, can solve problems such as product quality problems, bisphenol A plant operation shutdown, prilling tower blockage, etc., and achieve the effect of eliminating the reduction of heat transfer

Inactive Publication Date: 2008-12-31
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the heat exchange between the molten bisphenol A in the prilling tower and the circulating gas cannot be performed sufficiently, and the molten bisphenol A that cannot be granulated adheres to the bottom of the prilling tower, clogging the bottom of the prilling tower, and the prilling tower cannot be operated. , leading to major problems such as the shutdown of the bisphenol A plant
[0009] In addition, the attachment at the bottom of the prilling tower forms colored scale with high impurity concentration, which is isolated for some reason and discharged together with bisphenol A particles, causing product quality problems

Method used

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  • Process for producing granular bisphenol A
  • Process for producing granular bisphenol A

Examples

Experimental program
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Effect test

Embodiment 1

[0085] exist figure 1 In the process, the molten bisphenol A liquid is fed to the top of the prilling tower at 10 tons / hour, and the circulating gas is boosted by a blower (discharge pressure 3kPa-G), and the circulating gas (70,000Nm 3 / hour), to get grains.

[0086] Supply 1,500Nm to prilling tower 3 / hour of nitrogen (150Nm 3 / ton-melting bisphenol A), discharge out of the system by equal amount, keep micropressure state (1kPa-G), make the phenol concentration in the circulating cooling gas be controlled at 10-30 volume ppm. In addition, through the control of the cooling tower, it is added to the circulating gas cooler (heat transfer surface 3,000m2 , multi-tubular heat exchanger with fins) the temperature of cold water is 20°C-35°C.

[0087] After one year in this way, the inlet temperature of the circulating gas cooler becomes 67-68°C, and the outlet temperature of the circulating gas heat exchanger can be operated at the target 40°C. In addition, during one year o...

Embodiment 2

[0089] Same as Example 1, with 10 tons / hour, the molten bisphenol A liquid is supplied to the top of the prilling tower, and the circulating gas is boosted with a blower (discharge pressure 3kPa-G), and the circulating cooling gas (70,000Nm 3 / hour), to get grains.

[0090] Supply 700Nm to prilling tower 3 / hour of nitrogen (70Nm 3 / ton-melting bisphenol A), discharge out of the system by equal amount, keep micropressure state (1kPa-G), the phenol concentration in the circulating cooling gas is controlled at 20-50 volume ppm. In addition, through the control of the cooling tower, it is added to the circulating gas cooler (heat transfer surface 3,000m 2 , multi-tubular heat exchanger with fins) the temperature of cold water is 20°C-35°C.

[0091] After one year in this way, the inlet temperature of the circulating gas cooler becomes 67-68°C, and the outlet temperature of the circulating gas heat exchanger can be operated at the target 40°C. In addition, during one year of...

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Abstract

The invention provides a process for producing bisphenol-A prills from molten bisphenol A which comprises using a palletizing apparatus comprising: a palletizing tower in which molten bisphenol A is sprayed and brought into contact with a circulating gas to form pellets; a powder removal apparatus in which powdery bisphenol A contained in the circulating gas is removed; a circulating-gas cooler for regulating the temperature of the circulating gas; and a blower for circulating the circulating gas. In the process, the phenol concentration in the circulating gas is regulated to 50 ppm by volume or lower. The process eliminates troubles such as a decrease in heat transfer caused by deposit accumulation in a heat exchanger in the palletizing step and an increase in differential pressure caused by deposit accumulation in the palletizing tower and heat exchanger. Thus, high-quality bisphenol-A prills can be continuously, efficiently, and stably produced for long.

Description

technical field [0001] The invention relates to a method for preparing bisphenol A pellets from molten bisphenol A, in particular to a method for preparing high-quality bisphenol A pellets stably, continuously and efficiently for a long time. Background technique [0002] In recent years, the demand for bisphenol A as an engineering plastic has been increasing, and it is mostly used as a raw material for polycarbonate resin. From the perspective of applicability, it is mainly in the form of granular solids called "prills" in the market. on circulation. [0003] The equipment for preparing the granules is generally composed of the following equipment: a prilling tower equipped with a nozzle for spraying bisphenol A melt at the top of the tower; a heat exchange device for cooling the circulating gas discharged from the top of the prilling tower; A blower for circulating supply of cooling gas; and a powder removal device for removing and recovering bisphenol A powder accompany...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/70C07C39/16
CPCC07C37/20C07C37/685C07C37/70C07C37/74C07C37/84C07C37/86C07C39/16C07C37/68
Inventor 吉富一之增田修一儿玉正宏
Owner IDEMITSU KOSAN CO LTD
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