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Process and apparatus for producing diaryl carbonates

A technology of diaryl carbonate and dialkyl carbonate, which is applied in the field of production of diaryl carbonate, can solve the problems of reducing efficiency and hindering the continuous production of products, etc.

Active Publication Date: 2017-04-26
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These by-products can prevent the continued production of desired products, reduce the efficiency of the overall process and in some cases create waste streams that require special handling for disposal

Method used

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  • Process and apparatus for producing diaryl carbonates
  • Process and apparatus for producing diaryl carbonates
  • Process and apparatus for producing diaryl carbonates

Examples

Experimental program
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Embodiment

[0043] In this example and with reference to the above described figure 2 , 13,939 kilograms per hour (kg / h) of fresh phenol (PhOH) (stream 1) was mixed with a recycle stream (stream 16) of 38,342 kg / h of phenol (72.8 weight percent (wt %) of phenol (PhOH), 26.9 wt% dimethyl carbonate, 0.01 wt% methanol (MeOH) and 0.01 wt% anisole) were mixed and preheated to 147°C.

[0044] Then, 2,031 kg / h of recycle catalyst (stream 21 ) are combined with phenol stream 1 and stream 16 and fed to the first reactive distillation column (C21) at an intermediate height. To compensate for catalyst loss due to purge, 176 kg / h of fresh catalyst (stream 0) (comprising 25 wt% titanium tetraphenoxide catalyst and 75 wt% phenol) was continuously fed to the catalyst recycle loop. Additionally, 8,794 kg / h of pure DMC (stream 2) was mixed with a recycle stream of 37,884 kg / h of DMC (stream 8, which is substantially pure DMC (greater than 99 wt% purity)) and fed directly to the A reboiler for reactive...

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Abstract

A method for producing diaryl carbonate may include: introducing reactants into a first reactive distillation column (C21); recovering a first top stream (stream 5), a first bottom stream (stream 6) and a first Side stream (stream 13); introducing the first bottom stream (stream 6) to the second reactive distillation column (C32) without passing through another reactive distillation column; recovering the second reactive distillation column (C32) from the second reactive distillation column (C32). Two bottom streams (stream 15) and a second top stream (stream 16); introducing the first side stream (stream 13) to the first distillation column (C81); recovering the third from the first distillation column (C81) Bottoms stream (stream 12) and third top stream (stream 14); introducing the first top stream (stream 5) to the second rectification column (C41); and recovering the fourth top from the second rectification column (C41) stream (stream 7) and the fourth bottom stream (stream 8).

Description

technical field [0001] The present disclosure relates generally to methods and apparatus for the production of diaryl carbonates, and in particular to methods and apparatus for the production of diphenyl carbonate (“DPC”). Background technique [0002] Diaryl carbonates, such as DPC, are important reactants in the production of polycarbonates. For example, polycarbonate can be produced by reacting bisphenol A with DPC. Polycarbonates are valued practical materials because of their physical and optical properties. As the use of polycarbonates increases, it becomes more interesting to efficiently produce diaryl carbonates. Early methods for the production of diaryl carbonates used phosgene as a reactant. However, the toxicity of phosgene has motivated the development of phosgene-free methods. as in figure 1 As schematically shown in , the phosgene-free method involves a two-step process. First, a dialkyl carbonate such as dimethyl carbonate ("DMC") is reacted with an aro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C68/06C07C68/08C07C69/96B01D3/14
CPCB01D3/009C07C68/06C07C68/08C07C69/96Y02P20/10
Inventor 伊格纳西奥·维克·费尔南德斯塞尔焦·费雷尔·纳达尔何塞·安东尼奥·卡瓦列罗胡安·哈瓦洛耶斯·安东
Owner SABIC GLOBAL TECH BV