Production method

There are many production methods for this product, but there are mainly three methods using aniline, o-nitrochlorobenzene and diphenylthiourea as raw materials.

Using aniline as raw material, aniline, carbon disulfide and sulfur are usually directly reacted in an autoclave, or aliphatic amine, dimethylformamide, triazolidine and formaldehyde can be used instead of carbon disulfide to make aniline and sulfur react under pressure. The reaction pressure of the method using aniline as raw material is high, generally above 4MPa and up to 15MPa, so it is also called high pressure method.

Using o-nitrochlorobenzene as raw material, o-nitrochlorobenzene can be reduced to o-aminothiophenol by reaction with reducing agent sodium hydrosulfide, sodium polysulfide or hydrogen sulfide. And further reacted with carbon disulfide to prepare accelerator M. Some of these methods have a long reaction time (sodium hydrosulfide takes about 20h), but they can be carried out under normal pressure or lower pressure, also known as atmospheric pressure method.

Using diphenylthiourea as raw material, the reaction pressure of this method is between the two methods, below 4MPa, which is generally referred to as medium pressure method.

See water treatment agent 03301
The preparation method is to take o-chloronitrobenzene, sodium polysulfide and carbon disulfide as raw materials, react at 110-130 ℃ and 343kpa to form 2-Mercaptobenzothiazole sodium salt, and then acidify with sulfuric acid and wash with water to obtain the product.
Aniline and carbon disulfide can also be used to react with sulfur at about 200 ° C, and then 2-Mercaptobenzothiazole can be obtained by holding it at 7.85 MPa pressure and 250-260 ° C for 2.5 h, dissolving it into sodium salt with sodium hydroxide, acidifying it to pH = 9, filtering, acidifying and neutralizing the filtrate at 38-40 ° C, washing and drying the product.
Add aniline, carbon disulfide and sulfur into the condensation kettle in turn. The feed ratio is (mol): 1 ∶ 0.96 ∶ 0.36. And heated to about 260 ℃ at 8.1mpa. The condensation reaction was completed after 2H. To obtain crude 2-Mercaptobenzothiazole. Cool down and transfer it to the neutralization kettle. Add 7-8 ° B é alkaline solution to neutralize, filter, discard impurities, transfer the filtrate into the acidification kettle, and add 10 ° B é sulfuric acid to acidify to pH 6-7. Filter, wash the filter cake twice with water, dry, crush, sift and pack the finished product.

alias
2-mercapto-1,3-thiazide
Croxime active ester
MBT
M
Pre dispersed mbt-80
Pre dispersion M-80
Masterbatch mbt-80
Master rubber particle M-80
Drug glue mbt-8o
Drug glue m-8o
Accelerator MBT
2-Mercaptobenzothiazole
Accelerator M
2-MBT
Accelerator MBT (m)
Z-MBT
2-Mercaptobenzothiazole

chemical property
Pale yellow monoclinic acicular or flaky crystals with unpleasant odor. Insoluble in water and gasoline, soluble in ethanol, ether, acetone, ethyl acetate, benzene, chloroform and dilute alkali.