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Production process for continuously hydrolyzing and producing hydroquinone through multi-kettles in series

A technology of hydroquinone and multiple kettles in series is applied in the field of continuous hydrolysis of multiple kettles in series to produce hydroquinone production technology, which can solve the problems of large amount of waste water, high energy consumption, low production capacity, etc., and achieves large material capacity and operation Safe, easy-to-use effects

Active Publication Date: 2013-09-18
中国中化股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Aiming at the problems of large amount of waste water, low production capacity and high energy consumption in the process of producing hydroquinone by direct hydrolysis of p-aminophenol, the present invention proposes a production process of hydroquinone produced by continuous hydrolysis of multiple reactors in series

Method used

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  • Production process for continuously hydrolyzing and producing hydroquinone through multi-kettles in series
  • Production process for continuously hydrolyzing and producing hydroquinone through multi-kettles in series
  • Production process for continuously hydrolyzing and producing hydroquinone through multi-kettles in series

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Embodiment 1

[0038]Synthesize hydroquinone through three-stage serial tank reactors, each reactor has a volume of 100L, and maintain a certain position difference between the upper and lower reactors (the potential difference can be 0.1-1 meter), and each tank is connected in series through pipelines , The gas phase is connected in parallel to keep the pressure between the reactors in balance. Add water, 30% hydrochloric acid and p-aminophenol hydrochloride in the batching kettle of 3000L, determine p-aminophenol hydrochloride: hydrochloric acid: the mol ratio of water is 1:3:100, and material total amount is 2500L. The material is pumped from the batching tank into the reaction tank through the metering pump, and the flow rate is controlled at 0.8L / min. At the same time, under the condition that the pressure in each reactor is balanced, the reaction material flows from the upper level to the next level. The volume of the material in the reaction kettle is 80L, so that the reaction time of...

Embodiment 2

[0040] Hydroquinone is synthesized through three-stage series reactors, each reactor has a volume of 100L, and a certain positioning difference is maintained between the upper and lower reactors. Each reactor is connected in series through pipelines, and the gas phase is connected in parallel, so that the The pressure is balanced. Add water, 30% hydrochloric acid and p-aminophenol hydrochloride in the batching kettle of 3000L, determine p-aminophenol hydrochloride: hydrochloric acid: the mol ratio of water is 1:3:100, and material total amount is 2500L. The material is pumped into the reaction kettle from the batching tank through the metering pump, and the flow rate is controlled at 1.2L / min. At the same time, under the condition that the pressure in each reactor is kept balanced, the reaction material flows from the upper level to the next level by itself. The volume of the material in the reaction kettle is 80L, so that the reaction time of the reaction material in the kett...

Embodiment 3

[0042] Hydroquinone is synthesized through three-stage series reactors, each reactor has a volume of 100L, and a certain positioning difference is maintained between the upper and lower reactors. Each reactor is connected in series through pipelines, and the gas phase is connected in parallel, so that the The pressure is balanced. Add water, 30% hydrochloric acid and p-aminophenol hydrochloride in the batching kettle of 3000L, determine p-aminophenol hydrochloride: hydrochloric acid: the mol ratio of water is 1:4:50, and material total amount is 2500L. The material is pumped into the reaction kettle from the batching tank through the metering pump, and the flow rate is controlled at 1.2L / min. At the same time, under the condition that the pressure in each reactor is kept balanced, the reaction material flows from the upper level to the next level by itself. The volume of the material in the reaction kettle is 80L, so that the reaction time of the reaction material in the kettl...

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Abstract

The invention belongs to the field of organic synthesis, and in particular relates to a production process for continuously hydrolyzing and producing hydroquinone through multi-kettles in series. The production process comprises the following steps of: adding materials including para aminophenol hydrochloride, hydrochloric acid and water into a dosing kettle and mixing the materials; after mixing the materials, adding the mixture into at least three serial reaction kettles, wherein the pressure in each reaction kettle is kept in balance, and a potential difference between the upper level and lower level of each reaction kettle is kept, so that reaction materials flow to the next stage of reaction kettle from the previous stage of reaction kettle for hydrolysis reaction; enabling a hydrolysate to flow out of the last stage of reaction kettle; enabling the hydrolysate to flow into a condenser; introducing the cooled hydrolysate into a continuous extraction tower; desolventizing an organic phase of the extraction tower to obtain a hydroquinone crude product. As water and acid are repeatedly used in a hydroquinone production process, waste water is remarkably reduced; as continuous production is adopted, the production efficiency is high; the production process has the advantages of high yield and simplicity in process control.

Description

technical field [0001] The invention belongs to the field of organic synthesis, and in particular relates to a process for producing hydroquinone by continuous hydrolysis in series with multiple reactors. Background technique [0002] Hydroquinone, also known as hydroquinone, is an important fine organic chemical raw material, widely used in medicine, pesticides, dyes, rubber, additives and other industries. There are many synthetic methods of hydroquinone, among which the aniline oxidation method, p-dicumene peroxidation method, and phenol hydrogen peroxide hydroxylation method have been industrialized. [0003] (1) Aniline oxidation method: oxidize aniline to p-benzoquinone with manganese dioxide (or sodium dichromate) in sulfuric acid medium, and then reduce p-benzoquinone to hydroquinone. This method produces a large amount of waste water and waste residue in the production process, and this method has been basically eliminated abroad, and most of the manufacturers in m...

Claims

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Application Information

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IPC IPC(8): C07C39/08C07C37/045
Inventor 李付刚鄢冬茂闫士杰
Owner 中国中化股份有限公司
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