Production process of antioxidant 2,6-di-tert-butyl-4-methy phenol

A technology of di-tert-butyl and methyl phenol, which is applied in the direction of organic chemistry, can solve the problems of product shelf life impact, product unrecoverable, product yield reduction, etc., and achieve the effect of saving heat, preventing waste of raw materials, and complete reaction

Inactive Publication Date: 2007-03-21
孟祥儒
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems that the above-mentioned technique exists are: 1, add sulfuric acid as catalyst when feeding intake, must neutralize with alkali, in order to prevent pipeline from clogging, alkaline water must be warmed up to 70-80 ℃ (one ton of water); (two tons of water each time) to ensure that the ash content is qualified
Therefore, it not only consumes heat energy, but also must discharge about 3 tons of sulfur-containing wastewater, which will p...

Method used

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  • Production process of antioxidant 2,6-di-tert-butyl-4-methy phenol
  • Production process of antioxidant 2,6-di-tert-butyl-4-methy phenol
  • Production process of antioxidant 2,6-di-tert-butyl-4-methy phenol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. First carry out the alkylation reaction, and the solvent, p-cresol, isobutylene and solid catalyst that can be compatible with 2,6-di-tert-butyl-4-methylphenol are mixed according to the weight ratio of 0.6~1:1:1.030~ 1.045:0.016~0.075 material, the solvent is edible soybean oil or lubricating oil base oil or sesame oil or liquid paraffin or mono-tert-butylphenol or isobutylene dimer or low-molecular polyisobutene or mono-tert-butyltetracresol Or 2,6-di-tert-butylphenol. The solid catalyst is a mixture of aluminosilicate and concentrated sulfuric acid, wherein the weight ratio of aluminosilicate and concentrated sulfuric acid is 1:0.01 to 1:0.03, the solid catalyst is added to the alkylation tank, and then p-formaldehyde Phenol and isobutylene react at 65°C to 71°C, and the reaction formula is:

[0017]

[0018] 2. Initial crystallization, after the reaction is complete, guide the material into the crystallization tank, and leave the solid catalyst in the alkylat...

Embodiment 2

[0022] 1. First carry out the alkylation reaction, and take the solvent, p-cresol, isobutylene and solid catalyst compatible with 2,6-di-tert-butyl-4-methylphenol according to the weight ratio of 0.6:1:1.03:0.016 The solvent is edible soybean oil or lubricating oil base oil or sesame oil or liquid paraffin or mono-tert-butylphenol or isobutylene dimer or low-molecular polyisobutene, and the solid catalyst is a mixture of aluminosilicate and concentrated sulfuric acid. The weight ratio of the aluminosilicate to the concentrated sulfuric acid is 1:0.01, the solid catalyst is added into the alkylation tank, p-cresol and isobutylene are added, and the reaction is carried out at 65°C to 71°C.

[0023] 2. Initial crystallization, after the reaction is complete, guide the material into the crystallization tank, and leave the solid catalyst in the alkylation tank for the next use, then slowly lower the temperature to 25°C to completely fold out the crystals, and separate the crystals w...

Embodiment 3

[0027] 1. First carry out the alkylation reaction, and take the solvent, p-cresol, isobutylene and solid catalyst compatible with 2,6-di-tert-butyl-4-methylphenol according to the weight ratio of 1:1:1.045:0.075 The solvent is edible soybean oil or lubricating oil base oil or sesame oil or liquid paraffin or mono-tert-butylphenol or isobutylene dimer or low-molecular polyisobutene or mono-tert-butyltetracresol or 2,6-di tert-butylphenol, the solid catalyst is a mixture of aluminosilicate and concentrated sulfuric acid, wherein the weight ratio of aluminosilicate and concentrated sulfuric acid is 1: 0.03, the solid catalyst is added in the alkylation tank, and then the Cresol and isobutylene react at 65°C to 71°C.

[0028] 2. Initial crystallization, after the reaction is complete, guide the material into the crystallization tank, and leave the solid catalyst in the alkylation tank for the next use, then slowly lower the temperature to 25°C to completely fold out the crystals, ...

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Abstract

The production process of 2, 6-di-tert-butyl -4-methyl phenol includes the following steps: the first alkylation reaction of paracresol, isobutene and solid catalyst; leading the reaction product to the crystallizing kettle while leaving the catalyst for further use and lowering temperature slowly to separate out crystal; repeating the foregoing steps; washing the initial crystal with water solution of sodium hydroxide and separating oily matter from the washed alkali solution for reuse; recovering ethanol from the mother liquid in a rectifying tower for reuse and separating out inferior 2, 6-di-tert-butyl -4-methyl phenol product from the residue; drying the re-crystallized product and packing. The present invention has the advantages of no drained waste water, no environmental pollution, high product quality, etc.

Description

technical field [0001] The invention relates to a production process of antioxidant 2,6-di-tert-butyl-4-methylphenol. Background technique [0002] 2,6-di-tert-butyl-4-methylphenol (T501 for short) is an excellent antioxidant, widely used, and non-polluting antioxidant, which can be used as polyvinyl chloride, polyethylene, polypropylene, polypropylene Antioxidant of ester, polystyrene, ABS resin, butyl rubber and other rubber and latex, can effectively inhibit air oxidation, thermal degradation and copper damage, etc., has no pollution, no coloring, low melting point, easy mixing, Does not bloom, does not affect rubber vulcanization, suitable for white, light-colored products, foam products. Its production method is to mix p-cresol and isobutylene as raw materials, add sulfuric acid for chemical reaction, and generate 2,6-di-tert-butyl-4-methylphenol, then add soda ash and sulfuric acid for neutralization reaction, and generate sodium sulfate, Carbon dioxide and water are...

Claims

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Application Information

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IPC IPC(8): C07C39/06
Inventor 孟祥儒
Owner 孟祥儒
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