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Treatment method of denitration material in H acid production process

A technology of production process and treatment method, which is applied in the field of denitrification material treatment in the production process of H acid, can solve the problems of high requirements for extraction equipment, large loss of extraction agent, and low extraction efficiency, and achieve rapid and thorough stratification and low extraction agent loss. Small, the effect of improving extraction efficiency

Pending Publication Date: 2020-12-01
ZHEJIANG RUNTU INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide an improved treatment method for the denitrification material in the H acid production process, which can solve the problems of low extraction efficiency, large loss of extractant, and Difficult stratification and high requirements for extraction equipment

Method used

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  • Treatment method of denitration material in H acid production process
  • Treatment method of denitration material in H acid production process

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Experimental program
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Effect test

Embodiment 1

[0029] (1) Neutralization: Add 400g of liquid denitrification material into a 1000ml beaker, neutralize it with 18% ammonia water, and cool it with ice water at the same time, control the temperature at about 60°C, and neutralize until the final pH value is 0.7.

[0030] (2) Preparation of extractant: According to the molar ratio of nitro-T acid and trioctylamine in the denitration material is 1:3.6, the mass ratio of trioctylamine and sulfonated kerosene in the extractant is 1:1, and the 2L glass Add 510 g of trioctylamine and 510 g of sulfonated kerosene into the reaction kettle, start stirring and mixing evenly.

[0031] (3) Extraction: put the neutralized denitrification material into a 2L glass reactor, raise the temperature to 60°C, stir for 0.5 hour, then let it stand for 20 minutes, and separate the lower aqueous phase ammonium sulfate aqueous solution.

[0032] (4) Stripping: Add 30% aqueous sodium hydroxide solution and 260 g of water to a 2L glass reactor, adjust th...

Embodiment 2

[0035] The neutralizing pH value of step (1) of embodiment 1 is adjusted to 0.6, and all the other steps are consistent with embodiment 1.

[0036] As a result, in the extraction step, good stratification without entrainment can be achieved after standing for 5 minutes; after conversion of the loss of extractant, the loss of extractant per ton of denitrification material is 1.2kg.

Embodiment 3

[0038] The neutralizing pH value of step (1) of embodiment 1 is adjusted to 0.8, and all the other steps are consistent with embodiment 1.

[0039] As a result, in the extraction step, good stratification without entrainment can be achieved by standing still for 8 minutes; after conversion of the extraction agent loss, the loss of extraction agent per ton of denitrification material is 1.2kg.

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Abstract

The invention discloses a treatment method of a denitration material in an H acid production process. The method comprises the following steps: sequentially carrying out alkali neutralization, extraction and back extraction on a denitration material. According to the treatment method of the denitration material, the extraction efficiency of the denitration material can be effectively improved, thedenitration material is rapidly layered during extraction, the loss of an extracting agent is small, the extracting agent is easy to regenerate, meanwhile, the extraction condition is mild, the requirements of extraction equipment can be effectively reduced, and industrial production is better facilitated.

Description

technical field [0001] The invention belongs to the technical field of H-acid production, and more specifically relates to a treatment method for denitration material in the H-acid production process. Background technique [0002] H acid is an important dye intermediate, mainly used in the production of reactive dyes, acid dyes and direct dyes. The current main process for producing H acid is to use refined naphthalene as a raw material, through sulfonation, nitration, denitrification, neutralization with ammonia water, reduction of iron powder, filtration, sodium chloride salting out, filtration, alkali fusion, acid precipitation, filtration and other steps. have to. Among them, the neutralization step in ammonia water makes the solution carry a large amount of ammonium sulfate, and then causes the wastewater in the sodium chloride salting out step to be wastewater containing a large amount of ammonium sulfate, sodium chloride and organic matter. When the wastewater is sub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/10C01C1/24C07C303/44C07C309/40C02F103/36C02F101/34
CPCC02F1/66C02F1/26C02F9/00C01C1/24C07C303/44C02F1/048C02F2103/36C02F2101/34C07C309/40
Inventor 丁兴成高立江朱瑞超夏骏钢赵曰彪陈清
Owner ZHEJIANG RUNTU INST
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