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

A kind of method of preparing pyromellitic anhydride from methanol to gasoline synthetic oil

A technology for producing gasoline from pyromellitic anhydride and methanol, which is applied in organic chemistry and other fields, and can solve problems such as complicated process flow and difficult separation of durene and partial tetramethylbenzene, and achieve simplified purification process, simplified preparation and purification process Effect

Active Publication Date: 2016-06-22
CNOOC TIANJIN CHEM RES & DESIGN INST +1
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the current purification process of durene in heavy aromatics, it is difficult to separate durene and partial tetramethylene
In addition, the purification process of homoanhydride is also completed by multi-step crystallization, both of which have disadvantages such as complicated process flow

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
  • A kind of method of preparing pyromellitic anhydride from methanol to gasoline synthetic oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] As attached figure 1 As shown, the material 1 with a flow rate of 1000kg / h has a mesitylene and tetramethylbenzene content of 45wt% and 7.5wt%, respectively. 10 + The heavy aromatics feed pump 3 enters the light removal tower 5 at the 50th theoretical plate. The tower has a total of 80 theoretical plates, the reflux ratio is 12, the top operating pressure is 10kPa, the top and bottom temperatures are 120.7℃ and 140.7℃, respectively, the flow rate of the material 8 extracted from the top is 370kg / h, the bottom The content of mesitylene in the extracted material 9 was 68.9 wt%.

[0038] The material 9 from the light removal tower enters the weight removal tower 10 at the 40th theoretical plate. The tower has a total of 60 theoretical plates, the reflux ratio is 20, the top operating pressure is 10kPa, and the top and bottom temperatures are 138 respectively ℃ and 149.6℃. The flow rate of the material 14 extracted at the top of the tower is 495 kg / h, in which the contents o...

Embodiment 2

[0043] As attached figure 1 As shown, the material 1 with a flow rate of 1000kg / h has a mesitylene and tetramethylbenzene content of 51wt% and 6wt%, respectively. 10 + The heavy aromatics feed pump 3 enters the light removal tower 5 at the 43rd theoretical plate. The tower has 67 theoretical plates, the reflux ratio is 10.5, the top operating pressure is 30kPa, and the top and bottom operating temperatures are 125.9°C and 145.6°C, respectively. The material 8 with a flow rate of 350 kg / h is extracted from the top of the tower, and the content of mesitylene in the material 9 extracted from the tower is 78.0 wt%.

[0044] The material 9 from the light-removing tower enters the weight-removing tower 10 at the 36th theoretical plate. The tower has 51 total theoretical plates, the reflux ratio is 17, the top operating pressure is 30kPa, and the top and bottom operating temperature They are 145.4°C and 156.6°C, respectively. The material 14 with a flow rate of 560 kg / h is extracted f...

Embodiment 3

[0049] As attached figure 1 As shown, the material 1 with a flow rate of 1000kg / h has a content of mesitylene and tetramethylbenzene of 55.5wt% and 5.6wt%, respectively. 10 + The heavy aromatics feed pump 3 enters the light removal tower 5 at the 40th theoretical plate. The tower has a total of 60 theoretical plates, the reflux ratio is 7, the operating pressure at the top of the tower is 50kPa, and the operating temperatures at the top and bottom of the tower are 130.7°C and 151.7°C. The flow rate of the material 8 extracted from the top of the tower is 330 kg / h, and the content of mesitylene in the material 9 extracted from the tower bottom is 79.5 wt%.

[0050] The material 9 from the light removal tower enters the weight removal tower 10 at the 34th theoretical plate. The tower has 45 theoretical plates, the reflux ratio is 15, the top operating pressure is 50kPa, and the top and bottom operating temperatures are respectively 150.4°C and 161.6°C. The flow rate of the materi...

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

The invention relates to a method for preparing pyromellitic dianhydride through methane-to-gasoline synthetic oil. The method comprises the steps: by taking heavy aromatics containing 30wt%-70wt% of 1,2,4,5-tetramethylbenzene and 1wt%-10wt% of 1,2,4-tetramethylbenzene in methane-to-gasoline (MTG) synthetic oil as active ingredients, removing light components, removing heavy components, reacting, dissolving, washing, and rectifying to prepare 99.9wt% of 1,2,4,5-benzenetetraearboxylic dianhydride, wherein the mole yield of 1,2,4,5-tetramethylbenzene can achieve 94%-98%, and the mole yield of the 1,2,4,5-benzenetetraearboxylic dianhydride is up to 94%-97%. According to the method, the 1,2,4,5-benzenetetraearboxylic dianhydride is prepared directly through oxidization process by taking a 1,2,4,5-tetramethylbenzene and 1,2,4-tetramethylbenzene mixture as a feed material of a reactor; by introducing the phthalic anhydride as a solvent for dissolving the 1,2,4,5-benzenetetraearboxylic dianhydride, purification of the 1,2,4,5-benzenetetraearboxylic dianhydride can be carried out by washing and rectifying, so that the separation technique of C<10+> heavy aromatic and the preparation and purification techniques of 1,2,4,5-benzenetetraearboxylic dianhydride can be simplified to greater extent.

Description

Technical field [0001] The present invention belongs to the field of preparation of pyromellitic dianhydride, and specifically relates to a method for preparing pyromellitic anhydride from methanol to gasoline synthetic oil, that is, from the C of MTG synthetic oil 10 + Technology for purifying mesitylene from heavy aromatics to produce corresponding homoanhydride. Background technique [0002] The composition of MTG synthetic oil is quite special and contains C 10 + The content of mesitylene in heavy aromatics is relatively high, accounting for about 8wt% of the total weight of synthetic oil. Compared with the national automotive gasoline standard, this synthetic oil product has a higher content of aromatics. After burning, it will produce carcinogen benzene, which directly affects humans. health. Therefore, how to remove heavy aromatics and improve the utilization value of methanol-synthesized oil is an urgent problem to be solved. [0003] Homoanhydride is a very important chem...

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): C07D493/04
CPCC07D493/04
Inventor 汲银平于海斌舒畅沙喜江李世松王春雷张健
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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