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

Method for producing 4-cumylphenol and 2.4-dicumylphenol by using phenolic tar

A technology of dicumyl phenol and cumyl phenol, which is applied in the field of producing 4-cumyl phenol and 2.4-dicumyl phenol, can solve the problems of high energy consumption, low product value, waste, etc., and achieve high yield and saving Raw materials, the effect of increasing energy consumption

Inactive Publication Date: 2012-09-26
丁彦春
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So using phenol tar as fuel is a waste
Cracking it is also a process route with high energy consumption and low product value

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

[0021] A method for producing 4-cumylphenol and 2.4-dicumylphenol from phenol tar. The method has six steps. In the first step, the phenol tar is rectified by a high-vacuum molecular distillation device, and in the second step, 1.3 tons of molecular distillation products are distilled. Add 200Kg of fresh phenol to carry out depolymerization reaction through a solid strong acid molecular sieve fixed bed reactor. In the third step, the reaction product is crystallized with a mixture of dichloroethane and toluene as a solvent. In the fourth step, the dried material is mixed with methanol, ethanol, iso Propanol mixture is solvent to carry out recrystallization, the 4-cumylphenol that is all dissolved in methanol, ethanol, isopropanol crystallization mother liquor is carried out crystallization with dichloroethane and toluene mixture as solvent, the 6th step will The results of the third and fifth steps are used for distillation of the mother liquor of the crystallized dichloroethan...

Embodiment 2

[0023] The method for producing 4-cumylphenol and 2.4-dicumylphenol with phenol tar described in embodiment 1, the operating conditions and composition of described phenol tar through high vacuum molecular distillation device rectification are as follows; high vacuum molecular distillation operation The condition is 320pa (absolute pressure), the temperature is 193oC, and the yield of the tower top material is 95-96%; the composition is cumene content 0.1%, phenol content 12.8%, α-methylstyrene content 2.8%, acetophenone content of 3.5%, dimethyl benzyl alcohol content of 0.6%, α-methylstyrene dimer content of 30.5%, p-cumylphenol content of 37.5%, 2.4-dicumylphenol content of 12.1%, and heavy component content of 0.1%.

Embodiment 3

[0025] The method for producing 4-cumylphenol and 2.4-dicumylphenol with phenol tar described in embodiment 1 or 2, the described molecular distillation product 1.3 tons is added 200Kg fresh phenol and is decomposed by solid strong acid molecular sieve fixed-bed reactor Polymerization, the operating conditions are gauge pressure 0.12Mpa, temperature 120oC, depolymerization 1.5h, phenol in the molecular distillation product and fresh phenol react with α-methylstyrene in the molecular distillation product under the action of an acidic catalyst, and simultaneously The α-methylstyrene dimer is depolymerized, and the reaction generates p-cumylphenol; then the reactor is cooled down to 100 degrees Celsius, and the α-methylstyrene monomer of 500Kg is slowly added, at a gauge pressure of 0.12Mpa and a temperature of Reaction at 100oC for 3.5h, the product obtained is as follows; the composition is cumene content 0.1%, phenol content 0.8%, α-methylstyrene content 3.8%, acetophenone cont...

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 method for producing 4-cumylphenol and 2.4-dicumylphenol by using phenolic tar. The main research direction of the invention is to carry out catalytic cracking on phenolic tar and then recover acetophenone, phenol and alpha-vinyltoluene (alpha-alpha methyl styrene). The method comprises the following six steps: 1, carrying out rectification on the phenolic tar by using a high-vacuum molecular distillation device; 2. adding the obtained molecular distillation product (1.3 tons) into fresh phenol (200 kg), carrying out depolymerizing reaction on the obtained mixture by using a solid strong-acid molecular sieve fixed bed reactor, and then slowly adding alpha-vinyltoluene monomers (500 kg) into the reactor for reaction; 3, carrying out crystallization on the obtained reaction product through taking a mixture of dichloroethane and toluene as a solvent; 4, carrying out recrystallization on materials subjected to drying through taking a mixture of methanol, ethanol and isopropanol as a solvent; 5, carrying out crystallization on 4-cumylphenol (completely dissolved in a crystallization residue solution of methanol, ethanol and isopropanol) through taking a mixture of dichloroethane and toluene as a solvent; and 6, carrying out distillation on mother solutions of the mixtures of dichloroethane and toluene for crystallization in the step 3 and step 5. The method disclosed by the invention is used for producing 4-cumylphenol and 2.4-dicumylphenol.

Description

technical field [0001] The invention relates to a method for producing 4-cumylphenol and 2.4-dicumylphenol from phenol tar. Background technique [0002] Phenol tar is the residue at the bottom of the coke tower in the rectification section of the cumene-based phenol-acetone production plant. At present, several sets of cumene-based phenol-acetone production plants in China produce about 20,000-25,000 tons of phenol tar per year. Currently, phenol tar It is mainly used as fuel, and there are few domestic reports on its development and research. Previously, the main research and utilization direction was catalytic cracking of phenol tar to recover acetophenone, phenol and α-methylstyrene. [0003] The main components of phenol tar are cumene content 0.1%, phenol content 12.5%, α-methylstyrene content 2.6%, acetophenone content 3.3%, dimethyl benzyl alcohol content 0.5%, α-methylstyrene content Dimer content is 29.9%, p-cumylphenol content is 36.6%, 2.4-dicumylphenol conten...

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): C07C39/15C07C37/14
Inventor 丁彦春
Owner 丁彦春
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