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Process for producing high-quality granular bisphenol A

A high-quality, granular technology, applied in the preparation of organic compounds, organic chemical methods, chemical instruments and methods, etc., can solve problems such as metal powder abnormalities, quality problems, and rust

Active 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

[0007] Therefore, in the above-mentioned steps before the granulation step, even if the impurities in the bisphenol A solution are smeared with a filter, etc., the metal powder generated in the steps after the granulation step will also become impurities and be mixed into the finished granular bisphenol A solution. In A, there was a quality problem in the polycarbonate manufacturing process at the shipping destination
In addition, this problem also becomes a problem in the bisphenol A receiving equipment (receiving bin, etc.) in the polycarbonate manufacturing process.
[0008] Moreover, when the various machines in the bisphenol A preparation device are dismantled and inspected or repaired regularly or irregularly, the internal parts of the machine are in contact with the atmosphere and may rust (iron oxide)
When the operation was restarted in the above state, the generation of metal powder was abnormal, and there was a problem of disposing of the finished product bisphenol A mixed with a large amount of metal powder generated at the start of operation.

Method used

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  • Process for producing high-quality granular bisphenol A
  • Process for producing high-quality granular bisphenol A

Examples

Experimental program
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Embodiment

[0075] Hereinafter, the present invention will be described in further detail through examples, but the present invention is not limited by these examples.

[0076] Reference example

[0077] Using 2-mercaptoethylamine, the sulfonic acid groups of the cation exchange resin [manufactured by Mitsubishi Chemical Co., Ltd., "Daiyaion SK104H"] were partially neutralized by 20% mol, and the resulting catalyst was packed in a fixed-bed reaction tower, 3 hours at LHSV -1 Phenol and acetone (phenol: 32 tons / hour, acetone: 3 tons / hour) were continuously fed thereinto, and the reaction was carried out at 75°C. The resulting reaction mixture is introduced into a vacuum distillation tower, and is distilled under reduced pressure at a temperature of 170°C at the bottom of the tower and a pressure of 67kPa-A to remove acetone, water, etc. Press distillation, distill off phenol, be concentrated to the concentration of bisphenol A and be 40% mass, obtain the bisphenol A / phenol solution of 15...

Embodiment 1

[0084] The granular bisphenol A obtained in the above reference example was transported to the finished product warehouse at 4.3 tons / hour through a rotary valve (rotary blade: made of stainless steel) and a bucket conveyor (bucket: made of stainless steel, internal chain: made of iron). A metal trapping part is installed at the entrance of the finished product silo, and the metal trapping part passes a rod-shaped magnet (neodymium rare earth type, surface magnetic flux density: 0.9 tesla) inserted into a stainless steel tube with a diameter of 25 mm and a length of 40 cm and a stainless steel tube. Install two layers with an interval of 50mm (layer interval: 60mm), and measure the iron content of the finished granular bisphenol A sampled at the outlet of the finished product warehouse. Minutes, use the APHA standard color to visually evaluate the hue, and the result is APHA15.

Embodiment 2

[0086] A metal trapping part is arranged at the entrance of the finished product bin. The metal trapping part is obtained by inserting a magnet with a surface magnetic flux density of 0.7 Tesla in a stainless steel tube and installing the obtained rod-shaped magnet in two layers. In addition, it is the same as the embodiment 1 Granular bisphenol A was prepared in the same manner. Measure the iron content of the finished granular bisphenol A sampled at the outlet of the finished product warehouse, the content is 0.1ppm by mass, heat the bisphenol A at 220°C for 40 minutes in an air atmosphere, and use the APHA standard color to visually evaluate the hue, the result for APHA 15.

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Abstract

The invention provides a process for producing high-quality granular bisphenol A which comprises bringing granular bisphenol A (2,2-bis(4-hydroxyphenyl)propane) into contact with a metal-scavenging member disposed after a granulation step. Thus, metal particles which have come into the bisphenol A in the granulation and subsequent steps and metal particles which have resulted from periodic or irregular overhaul inspections or repairing of various devices in the production apparatus are efficiently removed from the granular bisphenol A.

Description

technical field [0001] The invention relates to a preparation method of high-quality granular bisphenol A (2,2-bis(4-hydroxyphenyl)propane). More specifically, it relates to a method for producing high-quality granular bisphenol A, which is characterized in that the metal powder in the granular bisphenol A is collected by a metal collecting member provided after the granulation step, thereby reducing the iron content to reduce. Background technique [0002] Conventionally, bisphenol A has been widely used as a raw material for polymers such as polycarbonate, epoxy resin, and polyacrylate. Among the polymers obtained from the above-mentioned bisphenol A, the demand for polycarbonate as optical materials such as substrate materials for optical disks has rapidly increased in recent years. [0003] Polycarbonate used as an optical material requires infinitely less impurities and infinite transparency (low hue). Of course, the same requirement is also required for bisphenol A a...

Claims

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Application Information

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IPC IPC(8): C07C37/68C07C39/16
CPCB03C1/30C07C37/68C07C39/16C07B63/00
Inventor 吉富一之增田修一儿玉正宏
Owner IDEMITSU KOSAN CO LTD
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