S-TDT Disproportionation and Alkyl Transfer Complete Set Technology and Catalyst

S-STDP toluene shapes selective disproportionation technology uses toluene as raw material to produce benzene and mixed xylene. The concentration of paraxylene in the mixed xylene product is about 9Owt% and PX products can be separated by shallow cold crystalization. When products are obtained by adsorption separation, the unit operating cost of the unit can be greatly reduced.

In 1997, the Shanghai Institute began to study the shape selectlondisproportionatlon technology of toluene and successively developed SD-01 and SD-30 catalysts. The catalyst and S-STDP process technology have been applied in the industry, and the energy consumption per PX product has been reduced by more than 30%, which meets the national requirements for energy conservation and consumption reduction.

The technology has accumulated more than 20 authorized invention patents at home and abroad, and won 1 second prize in NatlonalTechnological invention, 1 first prize in Sinopec Science and TechnologyProgress, and 1 China Patent Excellence Award.

S-STDP toluene shapes selective disproportionation technology in the presence of hydrogen, toluene as raw material under the action of modified molecular sieve catalyst to produce benzene and high concentration of mixed xylene products, the technical characteristics are as follows:

◆ High activity: toluene conversion >30%, C-8 aromatics product selectivity >50%; Joint production of benzene products, quality of high grade.

◆ Stable operation: The device runs stably, and the average annual temperature increase of the catalyst is less than 1℃.

◆ High operational flexibility: can operate in weight airspeed WHSV 3-4h-' range.

◆ Good shape selection performance: the paraxylene content in the mixed xylene product is about 90%, which reduces the load of the subsequent PX separation unit and energy consumption by about 30%; It can support the first stage crystallization separation process to produce PX products efficiently.

The main promotion brands of toluene shape selective disproportionation catalysts include SD01 and SD-30. The main technical indicators are as follows:

◆ Weight airspeed 3-4h

◆ Toluene conversion ≥33%

◆ Benzene product purity ≥99.93%

◆ PX para-selectivity ≥90%

◆ Overall selectivity ≥95%

◆ B/X molar ratio ≤1.4

◆ First cycle life ≥6 years

The first industrial test was carried out in Tlanin Petrochemical's 120,000 ton/year toluene disproportionation plant. it has been applied to 670,000 tons/year toluene disproportionation unit of Yangtze Petrochemical.

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