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2-ethylanthraquinone closed-loop liquid acid precipitation process

A technology of ethylanthraquinone and acid analysis, which is applied in the field of acid analysis of 2-ethylanthraquinone closed-loop liquid, can solve the problems of difficult comprehensive treatment of acidic wastewater, etc., so as to improve the economic benefits of enterprises, save resources, and improve the overall Yield effect

Active Publication Date: 2020-02-14
GUANGXI TIANDONG DASHENG CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0029] From the above analysis, it can be seen that the acid wastewater is extremely difficult to comprehensively treat, and it is the most important obstacle to realize the green and environmentally friendly industrial production of anthraquinone

Method used

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  • 2-ethylanthraquinone closed-loop liquid acid precipitation process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A kind of acid analysis process of 2-ethylanthraquinone ring-closing liquid, it is characterized in that, comprises the following steps:

[0048] (1) Establish an acid analysis external circulation system: the acid analysis external circulation system is composed of an acid analysis kettle, an acid analysis external circulation pump, an external circulation cooler and two mixers in different positions; the closed-loop reaction completion liquid is introduced into the acid analysis The mixer (M-1) installed in the tank is fully mixed with the main fluid of the external circulation; while the static mixer (M-2) installed before the acid precipitation process water is introduced into the suction end of the external circulation pump, in addition to being effective with the main fluid In addition to mixing, it will be further mixed under the action of the impeller of the subsequent external circulation pump.

[0049] (2) In the acid precipitation external circulation system,...

Embodiment 2

[0057] like figure 1 Shown, a kind of acid out process of 2-ethylanthraquinone ring-closing liquid comprises the following steps:

[0058] (1) Establish an external circulation system for acid analysis: the external circulation system for acid analysis is composed of an acid analysis kettle, an external circulation pump for acid analysis, an external circulation cooler and two feed mixers in different positions, which greatly improves the completion of the closed-loop reaction The mixing efficiency and mass transfer and heat transfer effects of liquid and acid precipitation process water can effectively avoid the occurrence of corresponding side reactions.

[0059] The specific process is as follows: the closed-loop reaction completion liquid is introduced into the special mixer installed in the acid analysis tank, and fully mixed with the main fluid of the external circulation; and the acid analysis process water is introduced into the static mixer installed before the suctio...

Embodiment 3

[0067] like figure 1 shown, refer to figure 1 Build an experimental device with the function of simulating the external circulation.

[0068] Fill the laboratory external circulation device with a specified concentration of sulfuric acid aqueous solution in advance, start the special external circulation engineering plastic corrosion-resistant micro-metering pump, and establish a normal external circulation flow.

[0069] The closed-loop reaction liquid is introduced into the inlet of the special mixer set in the acid analysis tank, and mixed with the main fluid flowing into the mixer at high speed to carry out efficient mass transfer and heat transfer.

[0070] At the same time, fresh process water is introduced into the static mixer at the suction port of the circulating pump, mixed with the main fluid of the external circulation, and then enters the pump body of the circulating pump together, and is fully mixed again under the action of the shear force of the high-speed ro...

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Abstract

The invention provides a 2-ethylanthraquinone closed-loop liquid acid precipitation process. According to the process, an acid precipitation kettle, an acid precipitation external circulation pump, anexternal circulation cooler and two mixers at different positions form an acid precipitation external circulation system and construct a new process flow; the mass transfer and heat transfer effectsin a closed-loop liquid acid precipitation process are improved, and the mass transfer mode during the contact between an closed-loop liquid and acid precipitation process water is optimized, so thatthe reaction system is prevented from forming a local high-concentration region, and the reaction heat generated at a high speed can be transferred out in a mild mode; with the process, side reactionssuch as carbonization, coking, sulfonation and the like in the closed-loop liquid acid precipitation process can be basically eliminated, so that the average yield of the BE acid closed-loop reactionprocess is increased to 80% from the current 72-75%; the quality of the acid precipitation wastewater is greatly improved, so that comprehensive utilization and treatment can be easily achieved by using a gypsum method or a magnesium sulfate method; and resources are saved, the environment is protected, production efficiency is improved, and enterprise economic benefits are improved.

Description

technical field [0001] The invention relates to an acid analysis process of a closed-loop liquid in an anthraquinone production process, in particular to an acid analysis process of a 2-ethylanthraquinone closed-loop liquid. Background technique [0002] The Friedel-Crafts method currently in use at home and abroad is used to produce 2-ethylanthraquinone, which includes the following two main steps: [0003] 1. Preparation of BE acid [0004] 1) Acylation reaction (synthesis of 2-ethylbenzoylbenzoic acid aluminum double salt) [0005] In the presence of the reaction solvent, phthalic anhydride, ethylbenzene, and aluminum trichloride undergo a condensation reaction to generate 2-ethylbenzoylbenzoic acid aluminum double salt (while hydrogen chloride gas is produced by-product). [0006] 2) Hydrolysis reaction (preparation of 2-ethylbenzoylbenzoic acid (hereinafter referred to as "BE acid")) [0007] The aluminum double salt formed in the condensation reaction in the previou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C46/00C07C50/16
CPCC07C46/00C07C2603/24C07C50/16
Inventor 杨华董世裕韦志磊
Owner GUANGXI TIANDONG DASHENG CHEM TECH
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