Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

The manufacture method of diaryl oxalate

A technology for diphenyl oxalate and dialkyl oxalate, which is applied in the field of manufacturing diaryl oxalate, can solve the problems of increased impurities, reduced selectivity, difficulty in manufacturing and the like, and achieves improved selectivity, improved reaction efficiency, The effect of manufacturing equipment simplification

Active Publication Date: 2016-01-06
UBE IND LTD
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In addition, in the above-mentioned production method, by using a multi-stage distillation column, the reaction, purification and separation operations were carried out, and the present inventors studied the production method, and found that although the reaction liquid does not contain a compound containing a halogen atom, the compound produced by Distillation towers, storage tanks, pipes and other reaction liquid contact parts made of austenitic stainless steel such as SUS304 specified in JISG4304, which are generally used as equipment materials such as distillation towers, are also found to be corroded and thinned. Long-term manufacturing difficulty
[0011] In addition, the alkyl alcohol distilled off in the above production method is mixed with low-boiling impurities generated during the transesterification reaction. If they are recycled to the dialkyl oxalate production process, the yield and selectivity of the production reaction will be affected. Undesirable state such as reduction of performance, increase of generated impurities, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • The manufacture method of diaryl oxalate
  • The manufacture method of diaryl oxalate
  • The manufacture method of diaryl oxalate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0192] The present invention is illustrated in detail by way of examples below. However, the present invention is not limited to the following examples at all.

Synthetic example 1

[0194] Synthesis of tetraphenoxytitanium

[0195] 300 ml of phenol was charged at the bottom of a flat-bottomed flask with an inner diameter of 32 mm and an Oldershaw type reactive distillation column (hereinafter referred to as "reactive distillation column for catalyst synthesis") having a volume of 1 L, and heated with an oil bath to raise the temperature. After the temperature distribution in the reactive distillation tower for catalyst synthesis was stabilized while maintaining the total reflux state, phenol was fed at a flow rate of 342.4g / h, and titanium tetraisopropoxide (TIPT) was fed at a flow rate of 21.6g / h . The ratio of the number of moles of phenol fed to the number of moles of Ti atoms in the TIPT (phenol / Ti) was 48. Keeping the reflux ratio at 5 the distillate from the top was withdrawn. In addition, it was continuously withdrawn from the bottom of the reaction distillation column for catalyst synthesis so that the liquid level at the bottom was maintained a...

Synthetic example 2～4

[0200] Synthesis of tetraphenoxytitanium

[0201] The same experiment as in Synthesis Example 1 was performed by changing some of the conditions shown in Table 1, and the results are shown in Table 1.

[0202] In addition, in the reaction solution of Synthesis Example 4, TPT was partially separated.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Disclosed is a process for preparing a diaryl oxalate which comprises the step of transesterifying a dialkyl oxalate or / and an alkylaryl oxalate with an aryl alcohol in the presence of a tetra(aryloxy)titanium as a catalyst, wherein the tetra(aryloxy)titanium is fed into a reaction system of the transesterification as an aryl alcohol solution of the tetra(aryloxy)titanium which is prepared by reacting a tetraalkoxy titanium and an excess amount of the aryl alcohol and removing a by-producing alkyl alcohol.

Description

technical field [0001] The present invention relates to a method for producing a diaryl oxalate by transesterifying a dialkyl oxalate or / and an alkylaryl oxalate with an aryl alcohol, and the like. Background technique [0002] Diaryl oxalate can be used as a raw material of diaryl carbonate which has been widely used as a monomer in the production of polycarbonate by the melt method by decarbonylation, and is a compound attracting attention in recent years. Diaryl oxalate can be produced by transesterifying dialkyl oxalate and aryl alcohol, and dialkyl oxalate used at this time can be produced from carbon monoxide and alkyl nitrite. [0003] A series of methods for producing diaryl carbonate from carbon monoxide and alkyl nitrite via dialkyl oxalate and diaryl oxalate have been proposed (see Patent Document 1). [0004] In addition, a method for producing diaryl oxalate has been proposed, which is characterized in that dialkyl oxalate and aryl alcohol are subjected to a tr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/03C07C68/00C07C69/36C07C69/96C08G64/30C07B61/00
CPCC07C67/03C07C68/00C08G64/307C07C69/36C07C69/96
Inventor 田中秀二井伊宏文
Owner UBE IND LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com