Rubber Accelerator MBT(M)

Description:

MBT(M)

Accelerator Chemical Name	2-Mercaptobenzothiazole
Molecular Formula	C7H5NS2
Molecular Structure
Molecular Weight	167.26
Gravity	1.42
CAS NO.	149-30-4
Package	25kg/bag
Storage Life	24 months

Specification:

According to the raw material route, there are mainly:

1) Aniline method;

2) o-nitrophenyl chloride method;

3) N-methylaniline method;

4) N,N-dimethylformamide method;

5) dimethylamine method;

6) haloaniline method;

7) benzothiazole method;

8) o-chlorothiophenol method;

9) Nitrobenzene method and the like.

The specific synthesis process of the rubber vulcanization accelerator M is: molten sulfur, aniline, CS2, benzothiazole is added to the high pressure reaction kettle with stirring, the reaction temperature is 250 ° C, the pressure is 5.87 MPa, after the reaction is finished, the pressure is released, the gas phase Part of the generated H2S and unreacted CS2 enter the sulfur recovery unit and the CS2 recovery unit. The molten M enters the dissolution tank and is dissolved with a NaOH solution, and the insoluble matter is removed by filtration. The filtrate was extracted with toluene to recover by-product benzothiazole and other tars. The toluene layer enters the solvent recovery process to recover benzene. The water layer is a M sodium salt solution. According to the needs of the downstream M derivative products, it can be directly used after concentration, and can also be acidified by acid, and then dried to obtain dry crystal M.

Ways to reduce costs:

The by-product benzothiazole was returned to the reaction vessel. The first is to refine the by-product tar, extract the benzothiazole by-product, and then: return it to the reactor. The second is to use the solvent to recover the refined crude M, avoiding the unnecessary consumption of the chemical refining process, and providing a simple and feasible process for industrial production. The by-product tar in the production process of M is mostly benzothiazole, followed by aniline, thioresordiurea and the like. According to the literature, benzothiazole is an intermediate product of M. Benzothiazole and thioresorthene can form M by adding S and CS2/S.

Refining of the reaction mixture:

Solvent extraction is used to recover the by-product benzothiazole and to refine the M sodium salt. The solvent used may be: monochlorobenzene, o-dichlorobenzene, toluene, benzene, CS2 and polychloroethane.

extraction:

During the extraction, the crude M was slowly added to the hot water, stirred vigorously in the presence of a surfactant, then an organic solvent was added, and stirring was continued in the case of emulsification until the temperature reached 170 °C.

The surfactants are sodium dodecylbenzenesulfonate, sodium nonylbenzenesulfonate, ammonium dibutyldodecylbenzenesulfonate, an alkali metal salt of a sulfonated fatty alcohol, an alkali metal soap, and the like. When an ionic surfactant is used, after extraction, the first half of the solution is filtered and acidified to a pH of 3-4.

The aniline method is based on aniline, CS2 and S. Since CS2 is a flammable and explosive hazardous chemical, it is very inconvenient to use. The company has reported the use of aniline, N, N'-dimethylformamide and S. The production process of the synthesis accelerator M as a raw material. The reaction temperature is 200-300 ° C, the optimum reaction temperature is 225-275 ° C, the pressure is 3.45-4.83 MPa (gauge pressure), and the reaction time is about 12 h, but the yield of the method is relatively low, only 66%.

Why choose us?

• Our Thiazoles products are designed to meet the specifications and requirements of our customers.
• Our advantages include efficiency advantages, small-scale technology advantages, relative location advantages, low cost advantages, characteristic products and industrial advantages.
• We are dedicated to providing Thiazoles products that exceed our customers' expectations.
• Our continuous management reform is to establish a series of customer-centric management systems with survival as the bottom line.
• We offer custom Thiazoles products to meet the specific needs of our customers.
• In the process of building a strong enterprise in the world, we regard the employees as the core of all the work of the enterprise, because the development of the enterprise is inseparable from the efforts of the employees.
• Our Thiazoles products are manufactured to meet the highest standards of quality and reliability.
• We practice our corporate integrity promises with the aim of being responsible to the country, customers, related parties and all employees.
• We pride ourselves on our ability to produce Thiazoles products with exceptional quality and craftsmanship.
• As product differentiation of our Rubber Accelerator MBT(M) becomes increasingly difficult, we are beginning to recognize the importance of brands and their value.

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