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Process for production of bisphenol-A

A bisphenol and phenol technology, which is applied in the field of preparing bisphenol A, can solve the problems of ion exchange resin catalyst activity reduction, etc., and achieve the effects of inhibiting activity reduction, preventing deterioration, and long-term stable production

Active Publication Date: 2008-12-17
MITSUBISHI RAYON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above method has a certain effect on the deterioration of the ion exchange resin catalyst. Nevertheless, the ion exchange resin catalyst still deteriorates, and after running again, the activity of the ion exchange resin catalyst may decrease sharply during long-term operation, so this method is not yet A method compatible with industrial-scale production equipment

Method used

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  • Process for production of bisphenol-A

Examples

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preparation example Construction

[0023] In the method for preparing bisphenol A of the present invention, each step performed after the above-mentioned reaction step is not particularly limited, and for example, a known method can be adopted. As each step performed after the reaction step, for example, a low boiling point component separation step of separating the reaction mixture obtained in the reaction step into a component containing bisphenol A and a low boiling point component containing unreacted acetone; The components of bisphenol A and phenol are precipitated in the form of crystals of the adduct of bisphenol A and phenol to obtain the crystallization step of the slurry; the slurry obtained in the crystallization step is separated into crystals and mother liquor, and the adduct of bisphenol A and phenol The recovery step of recovering the crystal form of bisphenol A; the crystals of the adduct obtained in the recovery step are melted, distillation, etc. to remove phenol to obtain bisphenol A; after at ...

Embodiment 1～3

[0032] Examples 1 to 3, Comparative Examples 1 to 2:

[0033] A fixed bed reactor (bottom radius = 0.2m) was filled with 125L of cation exchange resin. The cation exchange resin uses 2-(4-pyridyl)ethanethiol to convert sulfonic acid type cation exchange resin (manufactured by Mitsubishi Chemical Corporation "ダィャィォンSK104H) ") 15 mol% of the sulfonic acid group is modified to form. A phenol raw material consisting of 86.3% by weight of phenol, 13.7% by weight of other compounds (containing bisphenol A and its isomers, etc.), and 300 ppm by weight of moisture is supplied to the reactor (supply amount = 95 kg / h) , And an acetone raw material composed of 99.7% by weight of acetone and 0.3% by weight of water (supply amount = 3.5 kg / h), reacted at a reaction temperature of 58°C for 180 days. The acetone conversion rate immediately after the reaction started was 98.5%, and the acetone conversion rate after 180 days of operation was 91.5%. At this time, the supply of the acetone raw materi...

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Abstract

Disclosed is a process for production of Bisphenol-A comprising a reaction step of supplying a phenol raw material and an acetone raw material into a reactor filled with an ion exchange resin catalyst to yield a reaction solution containing Bisphenol-A. The process includes a manipulation of temporarily suspending the reaction and subsequently resuming the reaction. For the suspension of the reaction, any one of the following manipulations (a) and (b) is included: (a) reducing the supply of the acetone raw material into the reactor and subsequently suspending the supply of both the acetone raw material and the phenol raw material simultaneously; and (b) suspending the supply of the acetone raw material and subsequently suspending the supply of the phenol raw material. In the process, the liquid part in the reactor after suspending the supply of the phenol raw material has a water content of 0.5 to 2% by weight. The process enables to prevent the deterioration of the ion exchange resincatalyst in the reactor when the reaction is suspended by reason of periodic inspection or the like and also prevent the decrease in activity of the ion exchange resin catalyst after resuming the operation, whereby Bisphenol-A can be produced for a long period in a stable manner.

Description

Technical field [0001] The present invention relates to a method for preparing bisphenol A, and in particular to the following method for preparing bisphenol A. The method is a method for producing bisphenol A by reacting a phenol raw material with an acetone raw material in the presence of an ion exchange resin catalyst. The method can prevent the ion exchange resin catalyst in the reaction vessel from deteriorating when the reaction is stopped during periodic inspections, and can also suppress the decrease in the activity of the ion exchange resin catalyst after re-operation, and produce bisphenol A stably for a long time. Background technique [0002] Bisphenol A is usually prepared by the reaction of phenol and acetone in the presence of an ion exchange resin catalyst. The reaction proceeds continuously. After a certain period of time, the operation is stopped during periodic inspections, and the reaction is restarted after the inspections. During the period from stopping the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/20C07C39/16C07B61/00
CPCC07C37/20C07C39/16C07B61/00
Inventor 田中竜郎
Owner MITSUBISHI RAYON CO LTD
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