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

Dimethyl phthalate production process

A technology of dimethyl phthalate and phthalic anhydride, applied in the field of production technology of dimethyl phthalate, can solve the problem of low product yield and purity, high production cost, raw materials and water resources Waste and other problems, to achieve the effect of improving the catalytic efficiency of esterification, high esterification rate and good selectivity

Active Publication Date: 2021-07-02
RUNTAI CHEM CO LTD
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Dimethyl phthalate is a plasticizer with strong solubility for various resins. It can be compatible with various cellulose resins, rubbers, and vinyl resins. It has good film-forming, adhesive and Water resistance, often used in combination with diethyl phthalate in the production of cellulose acetate film, varnish, transparent paper and molding powder, etc. There are many problems in the traditional production process, especially the subsequent direct dehydration and refining by distillation , the waste of excess raw materials and water resources in the reaction is serious, the production cost is high, and the product separation accuracy is not high, the final yield and purity of the product are not high, and it is not suitable for industrial large-scale production applications

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of production technology of dimethyl phthalate, wherein: comprise the following steps:

[0033] S1. Put phthalic anhydride and methanol into the esterification reaction tower through the reaction pump, and add a catalyst to carry out the esterification reaction to obtain the crude product of dimethyl phthalate, the molar ratio of phthalic anhydride and methanol is 1 : 2.6; the catalyst consumption is 0.05% of the total mass of phthalic anhydride and methanol, and the reaction time is 2h; the temperature in the esterification tower is 160°C, and the reflux feed ratio is 1.8:1;

[0034] S2. adding the dimethyl phthalate crude product to an alkali washing tank for alkali washing;

[0035] S3. the dimethyl phthalate crude product after alkali washing is added in the washing tank and washed;

[0036] S4. adding the crude product of dimethyl phthalate after washing to the dehydration tower for dehydration;

[0037] S5. the dimethyl phthalate crude product after dehydra...

Embodiment 2

[0047] A kind of production technology of dimethyl phthalate, wherein: comprise the following steps:

[0048] S1. Put phthalic anhydride and methanol into the esterification reaction tower through the reaction pump, and add a catalyst to carry out the esterification reaction to obtain the crude product of dimethyl phthalate, the molar ratio of phthalic anhydride and methanol is 1 : 2.7; the catalyst consumption is 0.1% of the total mass of phthalic anhydride and methanol, and the reaction time is 3h; the temperature in the esterification reaction tower is 180°C, and the reflux feed ratio is 2:1;

[0049] S2. adding the dimethyl phthalate crude product to an alkali washing tank for alkali washing;

[0050] S3. the dimethyl phthalate crude product after alkali washing is added in the washing tank and washed;

[0051] S4. adding the crude product of dimethyl phthalate after washing to the dehydration tower for dehydration;

[0052] S5. the dimethyl phthalate crude product after...

Embodiment 3

[0062] A kind of production technology of dimethyl phthalate, wherein: comprise the following steps:

[0063] S1. Put phthalic anhydride and methanol into the esterification reaction tower through the reaction pump, and add a catalyst to carry out the esterification reaction to obtain the crude product of dimethyl phthalate, the molar ratio of phthalic anhydride and methanol is 1 : 2.8; the catalyst consumption is 1.0% of the total mass of phthalic anhydride and methanol, and the reaction time is 4h; the temperature in the esterification reaction tower is 200 ° C, and the reflux feed ratio is 2.4: 1;

[0064] S2. adding the dimethyl phthalate crude product to an alkali washing tank for alkali washing;

[0065] S3. the dimethyl phthalate crude product after alkali washing is added in the washing tank and washed;

[0066] S4. adding the crude product of dimethyl phthalate after washing to the dehydration tower for dehydration;

[0067] S5. adding the dimethyl phthalate crude p...

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 dimethyl phthalate production process which comprises the following steps: S1, adding phthalic anhydride and methanol into an esterification reaction tower through a reaction pump, and adding a catalyst for esterification reaction to obtain a dimethyl phthalate crude product; s2, adding the dimethyl phthalate crude product into an alkali washing tank for alkali washing; s3, adding the dimethyl phthalate crude product subjected to alkali washing into a water washing tank for water washing; s3, adding the washed dimethyl phthalate crude product into a dehydration tower for dehydration; and S4, adding the dehydrated dimethyl phthalate crude product into a rectifying tower, and rectifying to obtain the product. The dimethyl phthalate is synthesized from phthalic anhydride and methanol, SO4 < 2-> / Zr02-CeO2 and Sb2O3 / ZrO2 / zeolite are synergistically used as the catalyst, the dimethyl phthalate is synthesized through rectification, and the method has the advantages of being high in esterification rate, good in selectivity, high in yield and reusable in catalyst.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, in particular to a production process of dimethyl phthalate. Background technique [0002] Dimethyl phthalate is a plasticizer with strong solubility for various resins. It can be compatible with various cellulose resins, rubbers, and vinyl resins. It has good film-forming, adhesive and Water resistance, often used in combination with diethyl phthalate in the production of cellulose acetate film, varnish, transparent paper and molding powder, etc. There are many problems in the traditional production process, especially the subsequent direct dehydration and refining by distillation , the waste of excess raw materials and water resources in the reaction is serious, the production cost is high, and the product separation accuracy is not high, the final yield and purity of the product are not high, and it is not suitable for industrial large-scale production applications. Contents of the in...

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
IPC IPC(8): C07C67/08C07C69/80C07C67/54B01J27/053
CPCC07C67/08C07C67/54B01J27/053C07C69/80Y02P20/584
Inventor 卢小松宋文国张世元
Owner RUNTAI CHEM CO 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