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Resource utilization method of 3-methyl-2-nitrobenzoic acid wastewater

A nitrobenzoic acid and resource-based technology, which is applied in liquid carbon-containing fuels, fuel additives, petroleum industry, etc. The effect of peeling off the surface and improving the safety performance

Inactive Publication Date: 2020-10-30
ANHUI XIN SOLID ENVIRONMENTAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] By-products produced during the production of pharmaceutical and pesticide intermediates 3-methyl-6-nitrobenzoic acid or 3-methyl-2-nitrobenzoic acid (hereinafter referred to as 3-methyl-2-nitrobenzoic acid Benzoic acid wastewater), the main components of which are water, 3-methyl-2-nitrobenzoic acid, a small amount of 3-methyl-6-nitrobenzoic acid, a small amount of 3-methyl-4-nitrobenzoic acid , the continued separation and purification process consumes a lot of energy, resulting in a waste of resources and energy, or may cause secondary environmental pollution

Method used

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  • Resource utilization method of 3-methyl-2-nitrobenzoic acid wastewater

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Embodiment 1

[0029] A method for resource utilization of 3-methyl-2-nitrobenzoic acid waste water, raw materials are calculated in parts by mass, comprising the following steps:

[0030] Add 50 parts of 3-methyl-2-nitrobenzoic acid waste water (solid content is 18wt%) to the reactor, then add 350 parts of clear water, after stirring and mixing evenly, add 156 parts of sodium sulfite (85wt%), stir and mix evenly , adding a certain amount of sodium hydroxide solution (32wt%) to adjust the pH value to 8.5-9.5, sulfonation and heat preservation for 30min, and the sulfonation temperature does not exceed 50°C. Then dropwise add 100 parts of acetone, the temperature during the acetone dropping process does not exceed 55°C, and the dropwise duration is 30min; The temperature during the addition process does not exceed 95°C; after the dropwise addition, condense at 90-96°C for 2 hours, and cool down at the end of the heat preservation to obtain the dispersant.

Embodiment 2

[0032] A method for resource utilization of 3-methyl-2-nitrobenzoic acid waste water, raw materials are calculated in parts by mass, comprising the following steps:

[0033]Add 100 parts of 3-methyl-2-nitrobenzoic acid waste water (solid content is 15wt%) to the reactor, then add 300 parts of clear water, after stirring and mixing evenly, add 156 parts of sodium sulfite (85wt%), stir and mix evenly , adding a certain amount of sodium hydroxide solution (32wt%) to adjust the pH value to 8.5-9.5, sulfonation and heat preservation for 30min, and the sulfonation temperature does not exceed 50°C. Then dropwise add 100 parts of acetone, the temperature in the process of adding acetone does not exceed 55°C, and the time for dropping is 40 minutes; During the addition process, the temperature does not exceed 95°C; after the dropwise addition, condense at 90-96°C for 2 hours, and then cool down after the end of the heat preservation.

Embodiment 3

[0035] A method for resource utilization of 3-methyl-2-nitrobenzoic acid waste water, raw materials are calculated in parts by mass, comprising the following steps:

[0036] Add 150 parts of 3-methyl-2-nitrobenzoic acid waste water (solid content is 13wt%) to the reactor, then add 250 parts of clear water, after stirring and mixing evenly, add 156 parts of sodium sulfite (85wt%), stir and mix evenly , adding a certain amount of sodium hydroxide solution (32wt%) to adjust the pH value to 8.5-9.5, sulfonation and heat preservation for 30min, and the sulfonation temperature does not exceed 50°C. Then dropwise add 100 parts of acetone, the temperature during the dropping of acetone does not exceed 55°C, and the time for dropping is 20 minutes; During the dropping process, the temperature does not exceed 95°C; after the dropwise addition, condense at 90-96°C for 1 hour, and cool down at the end of the holding to obtain the dispersant.

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Abstract

The invention provides a resource utilization method of 3-methyl-2-nitrobenzoic acid wastewater. The method comprises the following steps of: adding wastewater into a reaction kettle, adding clear water or not, uniformly stirring and mixing, adding a certain amount of sulfonating agent, uniformly stirring and mixing, adding alkali to adjust the pH value, sulfonating, keeping the temperature, dropwise adding acetone, continuing to slowly dropwise add formaldehyde after dropwise adding of acetone, carrying out condensing and keeping the temperature after dropwise adding of formaldehyde, and carrying out cooling after the temperature is kept. By means of the resource utilization method, the wastewater can be directly used as a synthesis raw material of a sulfonated acetone formaldehyde condensate dispersing agent without other treatment, and the obtained dispersing agent can improve the strength of concrete and improve the safety performance of buildings.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a resource utilization method of 3-methyl-2-nitrobenzoic acid wastewater. Background technique [0002] Energy has always been the cornerstone of the world's progress and development, and coal, oil and natural gas are several conventional forms of energy. In my country's total energy consumption, petroleum accounts for 22.5%, coal accounts for 72.9%, and other energy sources account for 4.6%. China is a country with a lot of coal and little oil, relatively poor in oil resources, and rich in coal reserves. In the next few decades, coal will continue to play the role of the main energy source in China. However, the direct combustion and utilization of coal has led to relatively Low utilization efficiency and serious climate deterioration and environmental pollution. [0003] Taking energy security and environmental issues into consideration, the clean utilization of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G6/02C04B24/16C10L1/198C10L1/32C04B103/40C04B103/30
CPCC08G6/02C04B24/16C10L1/1981C10L1/324C10L2290/141C04B2103/408C04B2103/302C10L2300/30
Inventor 董翠平马丽涛乔琼琼尤健健徐培洋杨道顺朱海涛
Owner ANHUI XIN SOLID ENVIRONMENTAL CO LTD
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