Raw material molar ratio control based synthesis process for dithiocarbamate

Abstract

The invention discloses a raw material molar ratio control based synthesis process for dithiocarbamate. The synthesis process comprises the steps: (a) firstly, adding a certain quantity of carbon disulfide, alkaline liquid and carbamide into a reaction vessel, and controlling the molar ratio of carbon disulfide to carbamide at 2.1:1 to 2.3:1; (b) after uniformly stirring, controlling the temperature, and dropwise adding carbon disulfide; (c) controlling the reaction system within a certain temperature range, and continuing to stir; (d) heating and reacting at constant temperature for a certain time; (e) after the reaction is ended, stirring, cooling to crystallize, and filtering; (f) carrying out vacuum drying to obtain dithiocarbamate. According to the invention, dithiocarbamate is synthesized by using carbon disulfide and carbamide according to certain process parameters; the synthesis method is simple in synthesis step, high in synthesis efficiency and low in synthesis cost; synthesized dithiocarbamate is efficient, cheap and wide in application range; the yield of dithiocarbamate in the whole synthesis process is increased through controlling the ratio of reaction raw materials in the synthesis process.

Description

technical field [0001] The invention relates to a dithiocarbamate synthesis process based on controlling the molar ratio of raw materials. Background technique [0002] Dithiocarbamate, referred to as DTC for short, has been synthesized in the laboratory by reacting organic primary or secondary amines with CS2 in the middle of the 19th century. At present, dithiocarbamate and its derivatives are widely used in rubber, petroleum, agriculture, mining, medicine, environmental protection and fields of analytical chemistry. In the future, the application field of this kind of substance will be further expanded. [0003] In the petroleum industry, dithiocarbamate compounds are mainly used as extreme pressure antiwear agents for lubricating oils and high temperature antioxidants. Because the phosphorus element in the dithiophosphate lubricating oil anti-wear additives commonly used now will poison the catalyst of the engine exhaust gas conversion device, and based on environment...

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Problems solved by technology

[0013] (1) The cost of raw materials used is high and difficult to obtain in large quantities

Polyethylene polyamines such as ethylenediamine, diethylenetriamine, and triethylenetetramine are used as reactants. Although the research has confirmed that the corrosion inhibition performance of these substances is good, but because these raw materials are too expensive and difficult to obtain, if It is very difficult to popularize and use it on a large scale in drilling and completion operations

[0014] (2) There are too few studies on corrosive medium systems

The very small amount of domestic research is only on the corrosion inhibition performance of DTC substances in acidic corrosive medium systems and theoretical discussions, and there is no systematic study of DTC corrosion inhibitors in neutral, alkaline and various corrosion inhibitors. Corrosion inhibition performance in salt water corrosive medium system, especially in the more complex corrosive medium system of oil and gas wells

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