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2-tertiary-butyl hydroquinone preparation method

A technology of tert-butyl hydroquinone and methyl tert-butyl ether, which is applied in the preparation of high-efficiency polymerization inhibitor 2-tert-butyl hydroquinone, and in the field of high-efficiency antioxidants, can solve the problem of 2-tert-butyl Problems such as low yield of hydroquinone, etc., achieve the effects of easy application and implementation, cost reduction, and simple process

Inactive Publication Date: 2006-04-26
MAOMING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Therefore, the yield of 2-tert-butylhydroquinone (TBHQ) is not high

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0031] Add 27.5 grams of hydroquinone and 100 ml of toluene into a reactor equipped with a thermometer, a dropping funnel, a stirrer and a reflux condenser, and heat up and stir. When the temperature reached 110° C., the mixed liquid of 20 ml of methyl tert-butyl ether (MTBE) and 2 ml of sulfuric acid was started to be added dropwise. After the dropwise addition is completed, add 11.3ml of methyl tert-butyl ether (MTBE) dropwise. The total addition time should be controlled to be 40min, then continue to stir and react under reflux for 1hr, then add 11.1g of 2,5 tert-butyl p- Hydroquinone (DBHQ), stirred and refluxed for 1 hr, then distilled methanol. The content of 2-tert-butylhydroquinone (TBHQ) in the reaction liquid was 56.1%, and the content of 2,5-tert-butylhydroquinone (DBHQ) was 41.86% through gas chromatography analysis.

Embodiment 2

[0033] Add 27.5 grams of hydroquinone and 81 ml of toluene to a reactor equipped with a thermometer, a dropping funnel, a stirrer and a reflux condenser, heat up and stir. When the temperature reaches 85°C, start to drop the mixed liquid of 33.3ml of methyl tert-butyl ether (MTBE) and 2.66ml of sulfuric acid, and finish the dropwise addition within 20min. After stirring and reacting under reflux for 1 hr, 13.9 g of 2,5 tert-butylhydroquinone (DBHQ) was added, and reflux was continued for 1 hr, and methanol was distilled off. The content of 2-tert-butylhydroquinone (TBHQ) in the reaction solution was 57.97%, and the content of 2,5-tert-butylhydroquinone (DBHQ) was 38.96%.

Embodiment 3

[0035] Add 27.5 grams of hydroquinone and 135 ml of toluene into a reactor equipped with a thermometer, a dropping funnel, a stirrer and a reflux condenser, and heat up and stir. When the temperature reached 105°C, 33.3ml of methyl tert-butyl ether (MTBE) and 2.66ml of sulfuric acid mixed liquid were added dropwise, and the addition was completed within 60 minutes. After stirring and reacting for 45 minutes under reflux, 11.1 g of 2,5 tert-butylhydroquinone (DBHQ) was added, and the reaction was continued under reflux for 45 minutes, and then methanol was distilled off. The content of 2-tert-butylhydroquinone (TBHQ) in the reaction solution was 60.01%, and the content of 2,5-tert-butylhydroquinone (DBHQ) was 36.98%.

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Abstract

The 2-tert-butyl-hydroquinol preparing process has methyl tert-butyl ether as alkylating agent, and under the action of solvent and acid catalyst, methyl tert-butyl ether reacts with hydroquinone to produce 2-tert-butyl-hydroquinol. The process is completed in reflux state, and has alkyl transferring reagent 2,5-ditert-butyl-hydroquinol, solvent toluene or xylene and sulfuric acid as catalyst adopted. The process is simple, and has mild reaction condition, low material cost, high product yield and low product cost.

Description

technical field [0001] The invention relates to a preparation method of 2-tert-butylhydroquinone, a high-efficiency antioxidant for edible oil and high-efficiency polymerization inhibitor for monomer olefins. technical background [0002] 2-tert-butyl hydroquinone is also known as tert-butyl hydroquinone, tert-butyl hydroquinone or 2-tert-butyl-1,4 dihydroxybenzene, and its English name is 2-tert-butyl hydroquinone, TBHQ for short. TBHQ is currently recognized as the best edible oil antioxidant. It has the characteristics of high efficiency, safety, strong heat resistance, and does not change color when it meets iron. At the same time, it can effectively inhibit the growth of a variety of bacteria that are harmful to human health, such as Staphylococcus aureus, Escherichia coli and molds such as aflatoxin. It is widely used in edible oils, especially vegetable oils, fried foods and other oil-rich foods. Quality preservation and freshness preservation, its antioxidant perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/16C07C39/11
Inventor 汪树清陈小平马玉刚
Owner MAOMING COLLEGE
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