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Method for recovering organic tin from organic tin distillation waste

A technology of organotin and organic materials, applied in the fields of organic chemistry, tin-organic compounds, chemical instruments and methods, etc., can solve the problems of not effectively guaranteeing the accuracy of heating temperature, harm to the environment and health of staff, waste of raw materials, etc. Improve economic efficiency and environmental protection concept, simple and feasible operation, and avoid the effect of pollution

Pending Publication Date: 2018-12-18
包平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Trimethyltin and triethyltin are highly toxic to mammals
[0004] Distillation is often required when synthesizing various organotin compounds. After the synthesis is completed, the generated distillation waste liquid is mostly neutralized and then discharged into the wastewater and then oxidized by BOD, COD, etc. The treatment process is complicated and produces More SO 2 , CO 2 Such gases have caused great harm to the environment and the health of the staff
[0005] In the prior art, for heating, the accuracy of the heating temperature is not effectively guaranteed, and the result often deviates from the actual required target result due to the temperature error; (2) the washing process does not use an agitator, which makes the washing insufficient and wastes raw materials; Or adopt agitator, the influence of dynamic and static friction that agitator produces on stirring process; (3) often adopt static layering in the prior art, time is long, and effect is poor; Or utilize centrifuge to carry out centrifugation, but the stability of target rotating speed Poor, resulting in poor centrifugal effect

Method used

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  • Method for recovering organic tin from organic tin distillation waste
  • Method for recovering organic tin from organic tin distillation waste
  • Method for recovering organic tin from organic tin distillation waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0146] A method of reclaiming organotin from organotin distillation waste is:

[0147] Step 1: Put the distillation waste of isooctyl tin dimethyl dimercaptoacetate to stand for 6 hours, remove the water layer directly after layering, and recycle the organic material; then add water to the organic material according to the volume ratio of 1:5 for washing , stand still for 3 hours, after stratification, remove the water layer, and recycle the organic material;

[0148] Step 2: Place the washed distillation waste of isooctyl tin dimethyldithioglycolate in a three-necked flask, add a small amount of concentrated sulfuric acid, and heat the three-necked flask to 40°C. After a period of reaction, stop heating, and place the three-necked flask After the mixture in is fully washed with water, let it stand for 3 hours, after layering, remove the water layer, and recover the organic layer;

[0149] Step 3: Condensation reaction: Place the organic layer in a three-necked flask, add a c...

Embodiment 2

[0151] A method of reclaiming organotin from organotin distillation waste is:

[0152] Step 1: Put the distillation waste of isooctyl tin dimethyl dimercaptoacetate to stand for 7 hours, remove the water layer directly after layering, and recycle the organic material; then add water to the organic material according to the volume ratio of 1:5 for washing , stand still for 3.5 hours, after stratification, remove the water layer, and recycle the organic material;

[0153] Step 2: Place the washed distillation waste of isooctyl tin dimethyldithioglycolate in a three-necked flask, add a small amount of concentrated sulfuric acid, and heat the three-necked flask to 45°C. After a period of reaction, stop heating, and place the three-necked flask After the mixture in was fully washed with water, it was left to stand for 3.5 hours. After the layers were separated, the water layer was removed and the organic layer was recovered;

[0154] Step 3: Condensation reaction: Place the organi...

Embodiment 3

[0156] A method of reclaiming organotin from organotin distillation waste is:

[0157] Step 1: Put the distillation waste of isooctyl tin dimethyl dimercaptoacetate to stand for 8 hours, remove the water layer directly after layering, and recycle the organic material; then add water to the organic material according to the volume ratio of 1:5 for washing , stand still for 4 hours, after stratification, remove the water layer, and recycle the organic material;

[0158] Step 2: Place the distillation waste of isooctyl tin dimethyl dimercaptoacetate after washing in water into a three-necked flask, add a small amount of concentrated sulfuric acid, and heat the three-necked flask to 50°C. After a period of reaction, stop heating, and put the three-necked flask After the mixture in is fully washed with water, let it stand for 4 hours, after layering, remove the water layer, and recover the organic layer;

[0159]Step 3: Condensation reaction: Place the organic layer in a three-nec...

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Abstract

The invention discloses a method for recovering organic tin from organic tin distillation waste, belonging to the technical field of recovery of metal organic compounds. The method comprises the following steps: washing and purification of the organic tin distillation waste; an esterification reaction; and a condensation reaction. According to the invention, through washing and layering of organictin distillation waste liquid a plurality of times, soluble organic salts and various inorganic substances in the waste liquid can be removed; alcohol and acid are allowed to undergo the esterification reaction; concentrated sulfuric acid is used for catalysis and water absorption, so the complete progress of the esterification reaction is guaranteed; after the concentrated sulfuric acid in the esterification reaction is removed through washing, an excess amount of an organotin intermediate is added into the product ester to make the organotin intermediate and the ester undergo a substitutionreaction; a generated product is washed with water so as to obtain organic tin; and the excess organic tin intermediate has no influence on the application of the organotin and does not need to be removed, and convenience may be brought to the subsequent recovery of organic tin.

Description

technical field [0001] The invention belongs to the technical field of metal organic compound recovery, and in particular relates to a method for recovering organic tin from organic tin distillation waste. Background technique [0002] At present, the commonly used prior art in the industry is as follows: organotin compounds are metal-organic compounds formed by the direct combination of tin and carbon elements. methyl tin, dioctyl tin, tetraphenyl tin), agricultural insecticides, fungicides (such as dibutyl tin, tributyl tin, triphenyl tin) and coatings and antifungal agents for daily necessities, etc., in the natural environment, these Compounds will rapidly decompose under the action of heat, light, water, oxygen, ozone, etc. After entering the organism, it is easily absorbed by the small intestine or skin, especially the three-substitution form is most easily absorbed and distributed in the liver, kidney and brain. The liver-based microsomal drug-metabolizing enzyme sy...

Claims

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Application Information

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IPC IPC(8): C07F7/22G06N3/063
CPCC07F7/2296G06N3/063
Inventor 包平
Owner 包平
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