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Preparation and application of acyl carboxyl sulfur nitrogen ester compound

An acyl carboxyl group and thionitroester technology is applied in the field of mineral flotation and mineral flotation collectors. performance and metal sorting selectivity, improved collection capacity, and the effect of simple operation of the synthesis method

Active Publication Date: 2021-08-06
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ammonolysis method of xanthate is to first prepare xanthate by reacting alcohol, carbon disulfide and alkali, then react xanthate with halogenated reagent to prepare xanthate, and finally react xanthate with amine. The process is more complicated and less used
The tertiary amine method is to prepare thiazolate through the reaction of methyl or benzyl tertiary amine with carbon disulfide and haloalkane. The raw material tertiary amine used in this method is more expensive, and the separation of the obtained product is difficult, which limits its application.
In addition, due to the poor dispersion performance and less group synergism of the existing sulfur nitrogen ester collectors, their collection performance needs to be further improved

Method used

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  • Preparation and application of acyl carboxyl sulfur nitrogen ester compound
  • Preparation and application of acyl carboxyl sulfur nitrogen ester compound
  • Preparation and application of acyl carboxyl sulfur nitrogen ester compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Embodiment 1: Preparation of S-carboxyethyl-N-benzoyl dithiocarbamate

[0060] Add 1.15 parts of PEG-400 with a purity of 99%, 8.27 parts of NaSCN with a purity of 98% and 80 parts of dichloromethane with a purity of 99% into a 250mL three-necked flask, stir at 10°C for 10 minutes, then 14.20 parts Benzoyl chloride with a purity of 99% was heated to 25° C. for 3.5 hours after the dropwise addition, and filtered to remove salt after the reaction, and dichloromethane was recovered by rotary evaporation. Then, 9.40 parts of 2-mercaptoacetic acid with a purity of 98% were added to the reaction vessel, and the temperature was raised to 35° C. for 4 hours to react. After completion of the reaction, petroleum ether was added to precipitate a yellow solid, which was filtered to obtain the crude product of S-carboxyethyl-N-benzoyl dithiocarbamate, the product purity was 84.56%, and the yield based on 2-mercaptoacetic acid was 88.13%. The crude product of S-carboxyethyl-N-benzo...

Embodiment 2

[0061] Embodiment 2: Preparation of S-carboxyethyl-N-octanoyl dithiocarbamate

[0062] Add 1.15 parts of PEG-400 with a purity of 99%, 8.27 parts of NaSCN with a purity of 98% and 80 parts of dichloromethane with a purity of 99% into a 250mL three-necked flask, stir at 10°C for 10 minutes, and then add 16.43 A portion of octanoyl chloride with a purity of 99% was heated to 40° C. for 3.5 hours. After the reaction, the salt was removed by filtration, the dichloromethane was recovered by rotary evaporation, and 9.40 parts of sodium 2-mercaptoacetate with a purity of 98% were added to the reaction vessel, and the temperature was raised to 40° C. for 4 hours. After the reaction, add sherwood oil, separate out a yellow solid, filter to get the crude product of S-carboxyethyl-N-octanoyl dithiocarbamate, the product purity is 83.45%, and the yield based on 2-mercaptoacetate sodium is 86.27%. The crude product was purified by ethanol / water recrystallization for structural analysis. ...

Embodiment 3

[0066] Example 3: Flotation of S-carboxyethyl-N-benzoyl dithiocarbamate to chalcopyrite

[0067] In S-carboxyethyl-N-benzoyl dithiocarbamate concentration of 2 × 10 -5 mol / L, the pH of the pulp is 8.0, and the concentration of foaming agent (MIBC) is 1.5×10 -4 mol / L,N 2 The flow rate is 200mL / min, and the chalcopyrite with a particle size of -0.076mm-+0.038mm is floated for 3 minutes, and the flotation recovery rate of the chalcopyrite is 96.23%.

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Abstract

The invention belongs to the technical field of mineral flotation, and particularly relates to brand-new application of an acyl carboxyl sulfur nitrogen ester compound as a metal ore flotation collecting agent. The invention finds that the compound can generate a synergistic effect on the basis of the structure of molecules, mutual coupling of groups in the molecules and the like, and the collecting performance of a collecting agent on metal ores can be effectively improved.

Description

technical field [0001] The invention belongs to the field of mineral flotation, and in particular relates to the technical field of a mineral flotation collector. [0002] technical background [0003] Thiazepam compounds are an important class of organic compounds. This type of compound contains S atom with larger atomic radius, which can be used as vulcanizing agent; in addition, the S atom in the C=S group has a lone pair of electrons, which is easy to form a bond with a metal ion. Therefore, sulfur nitrogen ester compounds are widely used Applied in the fields of rubber, petroleum, agriculture, mining, medicine, analytical chemistry, etc. [J]. Lubrication and Sealing, 2009,34(9):76-78; Yao Junbing. Application of Ashless Thiocarbamate Lubricating Additives[J]. Lubricating Oil, 2005,20(6):41- 44. Jiang Tao. Synthesis of rare earth complexes of diethylthiocarbamate and research on promoting rubber vulcanization performance[J].Rare Earth,2000,21(3):39-41.Lotfi M., A.Modi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/012B03D101/02
CPCB03D1/012B03D2201/02
Inventor 黄小平曾坚贤周虎刘国清薛建荣
Owner HUNAN UNIV OF SCI & TECH
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