Method for producing oil antioxidant namely tert-butyl hydroquinone

A technology of tert-butylhydroquinone and antioxidant, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., capable of solving complex problems

Inactive Publication Date: 2018-07-20
CHENGDU PU LAI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing production methods are relatively complicated. As tert-butyl hydroquinone is used as an oil antioxidant, the pros and

Method used

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  • Method for producing oil antioxidant namely tert-butyl hydroquinone
  • Method for producing oil antioxidant namely tert-butyl hydroquinone

Examples

Experimental program
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Effect test

example 1

[0005] The production method of oil antioxidant tert-butyl hydroquinone, the main steps are: add hydroquinone, concentrated sulfuric acid and toluene to a reaction kettle, heat up to 80°C, slowly add equimolar tert-butyl alcohol, Phenol, reacted for 2 hours, separated the hot toluene layer, then distilled off the toluene with steam, hot filtered the water-containing residue, washed with p-xylene solution for 30 minutes, recrystallized in N,N-dimethylformamide solution, The obtained product, wherein, the mass fraction of p-xylene solution is 60%, and the mass fraction of N,N-dimethylformamide solution is 70%.

[0006] product quality

[0007]

example 2

[0009] The production method of oil antioxidant tert-butyl hydroquinone, the main steps are: adding hydroquinone, concentrated sulfuric acid and toluene to a reaction kettle, heating up to 84°C, slowly adding equimolar tert-butyl alcohol, Phenol, reacted for 3 hours, separated the hot toluene layer, then distilled off the toluene with steam, hot filtered the water-containing residue, washed with p-xylene solution for 50 minutes, recrystallized in N,N-dimethylformamide solution, The obtained product, wherein, the mass fraction of p-xylene solution is 65%, and the mass fraction of N,N-dimethylformamide solution is 73%.

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Abstract

The invention provides a method for producing an oil antioxidant namely tert-butyl hydroquinone. The method comprises the following main steps: adding hydroquinone, concentrated sulfuric acid and toluene into a reaction kettle, raising the temperature to 80-84 DEG C, slowly dropwise adding equimolar tert-butyl alcohol and hydroquinone for reaction for 2-3h, separating a hot toluene layer, removingtoluene through steam distillation, thermally filtering water-containing residual substances, carrying out washing with a p-xylene solution for 30-50 min, and carrying out re-crystallization in an N,N-dimethylformamide solution.

Description

technical field [0001] The invention relates to a compound production method, in particular to a production method of oil antioxidant tert-butyl hydroquinone. Background technique [0002] Tert-butyl hydroquinone can prevent oxidation of most oils, plastics, rubber, etc. It will not change color when it encounters iron and copper, but it will turn pink if there is alkali. It has excellent anti-oxidation performance and is suitable for cooking and frying products. . The general dosage is 100-200mg / kg. As a food additive, it can be used in edible oils, fried foods, biscuits, instant noodles, instant rice, canned dried fruits, dried fish products and cured meat products. The maximum dosage is 0.2g / kg. Most of the existing production methods are relatively complicated. As tert-butyl hydroquinone is used as an oil antioxidant, the pros and cons of its production methods have important economic significance for improving product quality and reducing by-product content. Content...

Claims

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Application Information

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IPC IPC(8): C07C37/16C07C39/08
CPCC07C37/16C07C39/08
Inventor 李丹
Owner CHENGDU PU LAI & TECH CO LTD
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