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Synthetic method of high-purity solid sodium dimethyl dithiocarbamate

A synthesis method and a technology of sodium formate, applied in the field of synthesis of high-purity solid sodium formate, can solve the problems of high loss of carbon disulfide and dimethylamine, incomplete reaction of dimethylamine, low content, etc., and reduce the overall product cost and avoid Poor operating environment, the effect of expanding the application field

Active Publication Date: 2014-05-28
YANTAI ZHONGKE RONGDA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the process of preparing solid formex sodium in the above-mentioned process, there are mainly the following deficiencies: (1) high energy consumption; (2) high loss of carbon disulfide and dimethylamine; The production and operation environment in the post-processing process is poor; (4) The yield of formex sodium is low, the content is low, and the purity is only about 95%

Method used

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  • Synthetic method of high-purity solid sodium dimethyl dithiocarbamate

Examples

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Effect test

Embodiment 1

[0036] Select a synthetic kettle with a volume of 2000L, and prepare solid sodium hydroxide, demineralized water, carbon disulfide and dimethylamine in a weight ratio of 525:525:1060:635.

[0037] 1. Add 525Kg of demineralized water into the synthesis kettle, start the agitator to stir, add 525Kg of solid sodium hydroxide within 30 minutes, and feed the cooling medium frozen brine into the jacket of the synthesis kettle. The temperature is generally 3~10℃, and control the The temperature of the inner material is 20~25°C, so that the solid sodium hydroxide is completely dissolved, and the mass fraction of the completely dissolved sodium hydroxide is slightly lower than 50%, generally 49.5%;

[0038] 2. Press 1060Kg carbon disulfide into the carbon disulfide high level tank from the storage tank with nitrogen;

[0039] 3. Pass 635Kg of gas dimethylamine from the bottom of the synthesis kettle, and add carbon disulfide from the upper part of the synthesis kettle at the same time,...

Embodiment 2

[0049] Select a synthetic kettle with a volume of 2000L, and prepare solid sodium hydroxide, demineralized water, carbon disulfide and dimethylamine in a weight ratio of 475:475:970:578.

[0050] 1. Add 475Kg of demineralized water into the synthesis kettle, start the stirrer to stir, add 475Kg of solid sodium hydroxide within 25 minutes, feed cooling medium into the jacket of the synthesis kettle, control the temperature of the material in the kettle to 10~20℃, and make the solid Sodium hydroxide is completely dissolved;

[0051] 2. Press 970Kg of carbon disulfide into the carbon disulfide high level tank from the storage tank with nitrogen;

[0052] 3. Pass 578Kg of gas dimethylamine from the bottom of the synthesis kettle, and add carbon disulfide from the upper part of the synthesis kettle at the same time, adjust the stirring speed of the stirrer to 63rpm, and control the reaction temperature to 25~30°C;

[0053] 4. Add carbon disulfide and gaseous dimethylamine into the...

Embodiment 3

[0062] Select a synthetic kettle with a volume of 3000L, and prepare solid sodium hydroxide, demineralized water, carbon disulfide and dimethylamine in a weight ratio of 750:775:1530:900.

[0063] 1. Add 750Kg of demineralized water into the synthesis kettle, start the stirrer to stir, add 775Kg of solid sodium hydroxide within 40 minutes, feed cooling medium into the jacket of the synthesis kettle, control the temperature of the material in the kettle to 20~25℃, and make the solid Sodium hydroxide is completely dissolved;

[0064] 2. Press 1530Kg carbon disulfide into the carbon disulfide high level tank from the storage tank with nitrogen;

[0065] 3. Pass 900Kg of gas dimethylamine from the bottom of the synthesis kettle, and add carbon disulfide from the upper part of the synthesis kettle at the same time, adjust the stirring speed of the stirrer to 80rpm, and control the reaction temperature to 25~35°C;

[0066] 4. Carbon disulfide and gaseous dimethylamine are added to ...

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Abstract

The invention provides a synthetic method of high-purity solid sodium dimethyl dithiocarbamate, which comprises the steps that softened water is added to a synthetic kettle and stirred; solid sodium hydroxide is added; the temperature of a material in the kettle is controlled to be 10-25 DEG C after solid sodium hydroxide is fully dissolved; carbon disulfide is pressed into a carbon disulfide head tank from a storage tank via nitrogen; dimethylamine is filled from the bottom of the synthetic kettle; carbon disulfide is added from the upper part of the synthetic kettle; stirring is performed via a stirrer; carbon disulfide and dimethylamine are added to the synthetic kettle within 80-120min; the stirrer is controlled to stir for continuous reaction after carbon disulfide and dimethylamine are fully added; the material in the synthetic kettle is put into a vacuum suction filter; a vacuum injection pump is started for vacuumizing; the vacuum degree is kept to be 0.07-0.09MPa; and solid sodium dimethyl dithiocarbamate is obtained. The method has the advantages that the method is high in purity and low in production cost; the content of dimethylamine in a mother solution can be reduced; and a working environment is improved.

Description

technical field [0001] The invention relates to the field of new chemical materials, in particular to a method for synthesizing high-purity solid formex sodium. Background technique [0002] Sodium thioformate is used as heavy metal precipitant, terminator of emulsion polystyrene butadiene rubber and styrene butadiene latex, industrial fungicide, vulcanization accelerator of rubber products and agricultural insecticide, etc. Sodium thiocyanate is an organic sulfur compound with good biocidal properties. Its function is similar to that of dithiocyanomethane. It is easily soluble in water and has the best effect when the pH is ≥ 7.0. Therefore, it is suitable for application in cooling water systems operating under alkaline conditions. It is used as a bactericidal algicide and slime preventive agent in industrial water treatment. The agent is compounded with 2-mercaptobenzothiazole to form a 30% aqueous solution, which is used for the control of bacteria, fungi and slime in i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C333/16
CPCC07C333/16
Inventor 庄青郭祥荣郭学阳孙春辉王璀郭彦恺李绍彦
Owner YANTAI ZHONGKE RONGDA NEW MATERIAL CO LTD
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