Synthetic process for DOTP-1

A technology for di-terephthalic acid and terephthalic acid, which is applied in the field of plasticizer synthesis technology, can solve problems such as oxidation and influence on product grade, and achieves lower reaction temperature, lower energy consumption and manufacturing cost, and shorter reaction time. Effect

Inactive Publication Date: 2014-03-26
ZHEJIANG HAILIYE TECH
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The normal reaction time in the existing production process is 10-12 hours, but the long-term high-temperature reaction is prone to oxidation, which affects the product grade and yield

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

[0014] Take 1,660 kg of phthalic acid, 3,248 kg of heptanol, and 16.2 kg of isopropyl titanate for later use; put 1,660 kg of phthalic acid and 1,083 kg of heptanol into the reactor, heat up to 160°C, and add 8.1 kg of Isopropyl titanate catalyst, isopropyl titanate was added within 5 minutes; after 3 hours of reaction, the temperature was raised to 198°C, and 1083 kg of heptanol was added, and 4.1 kg of isopropyl titanate catalyst was added after 5 minutes Carry out the reaction; after 3 hours of reaction, the temperature was raised to 210°C, and the remaining 1082 kg of heptanol and 4 kg of isopropyl titanate catalyst were added to the reaction liquid for reaction. After the reaction, the crude product was obtained; the crude product was washed with water, dealcoholized, Decolorize and filter to remove mechanical impurities to obtain the finished bis(2-propylheptyl) terephthalate.

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 discloses a synthetic process for DOTP-1. The synthetic process comprises the following steps: (1) taking raw materials at the molar ratio of terephthalic acid: heptyl alcohol=1:(2.7-2.9), and taking 3.3% of the total mass of phthalic acid and heptyl alcohol of a titanium(IV) isopropoxide catalyst; (2) putting all terephthalic acid and one third of the heptyl alcohol into a reaction kettle, heating up to 150-180 DEG C, adding 50% of the total quantity of the catalyst, and adding the catalyst within 4-6 minutes; (3) heating a reaction liquid I obtained in step (2) up to 190-210 DEG C, adding one third of the heptyl alcohol, and adding 25% of the catalyst after 5-10 minutes; (4) conducting heat preservation on a reaction liquid II obtained in step (3), adding surplus heptyl alcohol and catalyst into the reaction liquid II for reacting to obtain a crude product; (5) conducting water washing, dealcoholization, decoloring and filtering on the crude product to obtain a finished product. According to the synthetic process, the reaction time is greatly shortened and the reaction temperature is greatly lowered, so that the product quality is guaranteed and the product grade and yield are also improved, and the energy consumption and manufacturing cost are lowered.

Description

technical field [0001] The invention belongs to the synthetic technique of plasticizer, more specifically relate to a kind of synthetic technique of terephthalate (2-propylheptyl) ester plasticizer. Background technique: [0002] Di(2-propylheptyl) terephthalate (DOTP-1) is an industrial plasticizer with good cold resistance, heat resistance and extraction resistance. DOTP-1 has excellent electrical properties and high plasticizing efficiency. It is suitable for industrial processing of polyvinyl chloride resin, especially for heat-resistant cable materials, such as cable materials requiring high insulation, transparent plastic particles, and light box films. [0003] Terephthalic acid and excess heptanol undergo an esterification reaction in the presence of a catalyst to generate bis (2-propylheptyl) terephthalate and water, which are separated and separated by a water separator, and then decompressed and stripped. Reach the flash point index, filter, measure, and package ...

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 Applications(China)
IPC IPC(8): C07C69/82C07C67/08
CPCC07C67/08
Inventor 张桂琴刘雪强周旭楚姚文超
Owner ZHEJIANG HAILIYE TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap