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Recovery treatment process for waste liquid produced in acetochlor production and treatment device thereof

A technology of recovery and treatment of acetochlor, which is applied in the preparation of organic compounds, chemical instruments and methods, organic chemistry, etc., can solve the problems of corrosion equipment, difficult filtration, and ineffective recovery of ammonium chloride, etc., to reduce the generation of three wastes , improve the utilization rate of raw materials, and solve the effect of difficult filtration problems

Pending Publication Date: 2021-12-31
MAIQI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the recovery of acetochlor production waste liquid mainly adopts conventional rectification, which has problems such as blockage, corrosion equipment, difficulty in filtration, and low ethanol recovery rate. It cannot be carried out continuously, and the ethanol recovery rate is only about 30%. Too much, the by-product ammonium chloride cannot be effectively recovered, resulting in serious waste and pollution

Method used

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  • Recovery treatment process for waste liquid produced in acetochlor production and treatment device thereof
  • Recovery treatment process for waste liquid produced in acetochlor production and treatment device thereof

Examples

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Effect test

Embodiment 1

[0071] The recycling process of producing acetochlor output waste liquid comprises the following steps:

[0072] (1) Get 1000mL waste ethanol and carry out secondary distillation, and the cut passes through the impurity removal tower I 501 and the dehydration tower 502 successively, the impurity removal tower I 501 is provided with 18g hydrotalcite, and the dehydration tower 502 is provided with 10g molecular sieves, controlled The temperature inside the impurity removal tower I501 is 65°C, and the steam flow rate of the distillate is 1.3m 3 / h, the fraction passes through the impurity removal tower I 501 and the dehydration tower 502 to obtain crude ethanol.

[0073] (2) The crude ethanol obtained in step (1) is transported to the rectifying tower 6 for rectification to obtain 73.7g of ethanol, the yield of ethanol is 88.1%, its purity is 99.9%, and its moisture content is 260ppm. The ethanol content was analyzed by GC method, and the water content was determined by Karl Fis...

Embodiment 2

[0075] The recovery and treatment process of producing acetochlor output waste liquid is different from Example 1 in that the inorganic dehydrating agent in the dehydration tower 502 of this embodiment is 15g of activated alumina, and the recovery process of this embodiment obtains 71.5g of ethanol , the yield of ethanol was 85.4%, its purity was 99.9%, and the moisture content was 250ppm.

Embodiment 3

[0077] The recovery and treatment process of producing acetochlor output waste liquid is different from Example 1 in that the present embodiment controls the temperature of the deacidification tower 5 to be 60 ° C, and the purity of the ethanol obtained by the recovery process of the present embodiment is 99.91%. The moisture content was 200 ppm.

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Abstract

The invention provides a recovery treatment process for waste liquid produced in acetochlor production and a device thereof, and belongs to the technical field of waste liquid recovery treatment. The recovery treatment process comprises the following steps: distilling the waste liquid generated by washing the acetochlor mother liquor to obtain waste ethanol and an ammonium chloride solution; distilling the waste ethanol to preliminarily remove impurities; carrying out impurity removal and dehydration treatment on the fraction, and further purifying to obtain crude ethanol; rectifying the crude ethanol to obtain high-purity ethanol; and purifying and recovering the ammonium chloride solution to obtain industrial-grade ammonium chloride. According to the recovery treatment process, absolute ethyl alcohol with the ethyl alcohol content larger than 99.9% can be obtained, and the recovery rate of ethyl alcohol is larger than 85%. The recovered high-purity ethanol can be directly returned to the acetochlor production process for use, so that the utilization rate of raw materials is increased. On the other hand, industrial-grade ammonium chloride can be obtained by treating the ammonium chloride solution, and generation of three wastes is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of waste liquid recovery and treatment, and in particular relates to a recovery and treatment process for producing acetochlor output waste liquid. In addition, the invention also relates to a recovery and treatment device for producing acetochlor output waste liquid. Background technique [0002] At present, acetochlor is a leading product in the domestic herbicide market, with an annual demand of more than 100,000 tons. Existing acetochlor synthetic technique is based on methylene method, is divided into three continuous steps: 2-methyl-6-ethylaniline reacts with paraformaldehyde catalyst to obtain intermediate imine; imine and chloroacetyl chloride The acylate is obtained by the reaction; under the action of anhydrous ammonia, the acylate reacts with ethanol to obtain acetochlor. In this production line, the side reactions and unreacted raw materials in each step are gathered at the end for separation an...

Claims

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Application Information

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IPC IPC(8): C07C29/80C07C31/08C01C1/16
CPCC07C29/80C01C1/16C07C31/08
Inventor 梁斌谭学军闫广学周淑飞吴正岭卢进力胜继伟申成龙
Owner MAIQI CHEM CO LTD
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