Method for recycling trichlorotoluene and/or benzoyl chloride waste slag

A technology of trichlorotoluene and benzoyl chloride, which is applied in the field of recycling and utilization of trichlorotoluene and/or benzoyl chloride waste residue, can solve problems such as crop growth poisoning, odor environmental impact, pollution of groundwater water quality, etc., and achieves environmental reduction. Pollution, the effect of reducing production costs

Active Publication Date: 2015-12-23
YIDU YOUYUAN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, a large number of distillation bottom materials produced in production have brought urgent problems to manufacturers, society and the environment, that is, the problem of waste residue treatment. Traditional waste residues are treated by incineration, and the secondary pollution and odor caused by combustion are harmful to the environment. Great environmental impact
The use of landfills to dispose of residues, on the one hand, occupies my country's limited land resources, and on the other hand, the waste residues seeping into the ground may pollute the quality of groundwater, and at the same time have a toxic effect on the growth of crops planted on it.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Heat 1,200kg of benzoyl chloride waste residue to 50°C to melt, and the obtained liquid material is subjected to vacuum heating and distillation. The distillation temperature is 150°C, and the vacuum degree is above 0.07MPa; 550kg of trichlorotoluene or benzoyl chloride can be recovered, with a content of 92.5 %, the generated waste gas (the main components in the waste gas are hydrogen chloride gas and benzoic acid sublimation) is absorbed by a falling film absorption tower, and the material after the distillation is complete continues to be heated to make it coke, and 530kg of coking material with a carbon content of 98% is obtained ;

[0019] 2) Add water to the trichlorotoluene or benzoyl chloride obtained in step 1), the amount of water added is 5 times that of the material, then heat to convert all the trichlorotoluene or benzoyl chloride into benzoic acid, stir for 2 hours, and control the temperature at 45°C. Regulate pH to 7 with sodium hydroxide solution ag...

Embodiment 2

[0021] 1) Heat 1,280kg of trichlorotoluene waste residue to 50°C to melt, and the obtained liquid material is subjected to vacuum heating and distillation. The distillation temperature is 150°C, and the vacuum degree is above 0.07MPa; 530kg of trichlorotoluene or benzoyl chloride can be recovered, and the resulting The waste gas (the main components in the waste gas are hydrogen chloride gas and benzoic acid sublimation) is absorbed by the falling film absorption tower, and the material after the distillation is completed continues to be heated to make it coke, and 710kg of coking material with a carbon content of 98% is obtained;

[0022] 2) Add water to the trichlorotoluene or benzoyl chloride obtained in step 1), the amount of water added is 5 times that of the material, then heat to convert all the trichlorotoluene or benzoyl chloride into benzoic acid, stir for 2 hours, and control the temperature at 45°C. Regulate pH to 7 with sodium hydroxide solution again, material is ...

Embodiment 3

[0024] 1) Heat 1,350 kg of trichlorotoluene and benzoyl chloride waste residue to 50°C to melt, and the obtained liquid material is subjected to vacuum heating and distillation, the distillation temperature is 150°C, and the vacuum degree is above 0.07MPa; trichlorotoluene or benzoyl chloride can be recovered 540kg, the generated waste gas (the main components in the waste gas are hydrogen chloride gas, benzoic acid sublimation) is absorbed by falling film absorption tower, and the material after complete distillation is continued to be heated to make it coking, and 760kg of coking material with a carbon content of 98% is obtained ;

[0025] 2) Add water to the trichlorotoluene or benzoyl chloride obtained in step 1), the amount of water added is 2 times that of the material, then heat to convert all the trichlorotoluene or benzoyl chloride into benzoic acid, stir for 2 hours, and control the temperature at 45°C. Regulate pH to 8 with sodium hydroxide solution again, material ...

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PUM

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Abstract

The invention discloses a method for recycling trichlorotoluene and / or benzoyl chloride waste slag, which comprises the following steps: melting the waste slag by heating, distilling the obtained liquid material by vacuum heating to recycle trichlorotoluene and / or benzoyl chloride, absorbing the generated exhaust gas by a falling film absorption tower, and continuing heating the completely distilled material to perform coking, thereby obtaining the coked material with the carbon content of 98% or above; and adding water into the recycled trichlorotoluene and / or benzoyl chloride, heating while stirring, regulating the pH value to 7 or above with a sodium hydroxide solution, separating the solution, adding a hydrochloric acid solution into the supernate to regulate the pH value to 4.8-5.2, cooling to room temperature, and carrying out centrifugal separation to obtain benzoic acid. The method provided by the invention can effectively treat the waste slag and recycle the effective components in the waste slag, thereby enhancing the added value of the product and reducing the environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a recycling method of trichlorotoluene and / or benzoyl chloride waste residue. Background technique [0002] my country's chemical industry is developing rapidly and has a good prospect, but the pollution accompanying the development is also becoming more and more serious. How to effectively treat and utilize the waste residue produced by the production of trichlorotoluene and / or benzoyl chloride is of great significance for saving resources, preventing environmental pollution, and developing circular economy. In recent years, a large number of distillation bottom materials produced in production have brought urgent problems to manufacturers, society and the environment, that is, the problem of waste residue treatment. Traditional waste residues are treated by incineration, and the secondary pollution and odor caused by combustion are harmful to the env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/04C07C51/093C07C63/06
CPCC07C51/04C07C51/093C07C63/06
Inventor 孙大明黎孔富陈清华
Owner YIDU YOUYUAN IND CO LTD
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