33results about How to "High toluene conversion" patented technology

The invention relates to a catalyst for catalyzing direct oxidation of toluene to prepare benzaldehyde and a preparation method thereof. The catalyst comprises the following components in percentage by weight: 85 to 90 wt% of magnesium oxide and alumina composite oxide carrier; 0.5 to 10 wt% of cerium, 0.5 to 5 wt% of cobalt, 0.1 to 5 wt% of copper, and 0.5 to 2 wt% of nickel, wherein the mole ratio of magnesium oxide to alumina is 1-2. The catalyst takes a mixture of magnesium oxide and alumina as the carrier, can directly catalyze the oxidation of toluene to prepare benzaldehyde, and has the advantages of high toluene conversion rate, high benzaldehyde selectivity, high reaction stability, excellent performance, and mild reaction conditions. Moreover, the reaction product and the reactants are in two phases, and thus separation and purification become easier.

The invention discloses a catalyst for side-chain alkylation of toluene and methanol and a preparation method for styrene. The catalyst comprises: an ordered mesoporous molecular sieve catalyst and an oxygen-free methanol dehydrogenation catalyst; the ordered mesoporous molecular sieve catalyst doped with alkali metal ions. On the one hand, the catalyst utilizes the good dehydrogenation performance of the methanol anaerobic dehydrogenation catalyst to produce formaldehyde as a real alkylation agent; on the other hand, it utilizes the excellent side chain alkylation performance of the alkali metal ion-modified mesoporous molecular sieve catalyst, The products styrene and ethylbenzene are obtained, thereby obtaining higher conversion rate of toluene and selectivity of styrene-ethylbenzene. Another aspect of the present invention also provides a styrene preparation method using the catalyst.

The present invention discloses an EU-1 / ZSM-5 composite molecular sieve and a toluene disproportionation and transalkylation catalyst and application of the catalyst. In the EU-1 / ZSM-5 composite molecular sieve, a ZSM-5 molecular sieve is embedded around a EU-1 molecular sieve, the EU-1 molecular sieve accounts for 30% to 70% weight percent of the composite molecular sieve, and the molar ratio of silica / alumina is 30 to 50. The toluene disproportionation and transfer catalyst includes the composite molecular sieve. The composite molecular sieve-containing toluene disproportionation and transalkylation catalyst of the present invention has excellent performance in use without carrying metal components, and has relatively high toluene conversion rate, and benzene and xylene (B + C8A) selectivity.

The invention discloses a method for preparing a toluene methanol side chain alkylation catalyst. The alkali metal type molecular sieve is ion-exchanged in an alkali metal-containing solution, calcined I, ball milled, and calcined II to obtain the catalyst. The prepared catalyst can greatly increase the conversion rate of toluene, and at the same time, can keep the total selectivity of ethylbenzene and styrene in the product higher.

The invention relates to a side-chain alkylation method of toluene methanol, which mainly solves the problems of rapid catalyst deactivation and poor stability in the prior art. The present invention uses toluene and methanol as raw materials, under the condition that the reaction temperature is 200-600°C, the reaction pressure is 0-0.5 MPa, and the weight space velocity of the raw materials is 0.5-10 hours-1, the raw materials are contacted with the catalyst, and the reaction produces Ethylbenzene and styrene; the molar ratio of toluene to methanol in the raw material is 0.1-10; the catalyst includes the following components in weight percentage: a) 98-99.5% alkali metal ion-exchanged X molecular sieve; b) 0.5- The technical solution of 2% rare earth elements solves this problem well, and can be used in the industrial production of ethylbenzene and styrene by side-chain alkylation of toluene and methanol.

The invention discloses an EU-1 / Beta composite molecular sieve, and a catalyst for toluene disproportionation and transalkylation and the application of the catalyst. The EU-1 / Beta composite molecular sieve has crystal phases of an EU-1 molecular sieve and a Beta molecular sieve. The structure of the composite molecular sieve is that the Beta molecular sieve tightly wraps around the EU-1 molecular sieve, wherein the EU-1 molecular sieve accounts for 30% to 70% weight percent of the composite molecular sieve. The catalyst for toluene disproportionation and transalkylation of the invention includes the above EU-1 / Beta composite molecular sieve, and the EU-1 / Beta composite molecular sieve accounts for 40% to 95% weight percent of the catalyst. The composite molecular sieve-containing catalyst for toluene disproportionation and transalkylation of the invention has excellent performance in use without carrying metal components, and has relatively high toluene conversion rate, and benzene and xylene (B + C8A) selectivity.

The invention discloses a catalyst for toluene disproportionation and transalkylation, comprising a hydrogen type Y-Beta composite molecular sieve and an inorganic refractory oxide, wherein the content of the hydrogen type Y-Beta composite molecular sieve in the catalyst is 10 wt%-90 wt%. The catalyst for toluene disproportionation and transalkylation is applied to the process of preparing benzene and dimethylbenzene by using toluene and C9 aromatic hydrocarbon as raw materials; by adopting a fixed bed process and appropriate process conditions, higher toluene transforming rate and B+C8A selectivity and favorable stability can be obtained.

A catalyst for methylating toluene to prepare xylene with high selectivity and low requirement to environment features that the combined organic amine-ether template is used to prepare ZSM-5 molecular sieve, and said ZSM-5 molecular sieve is then modified by organosilicon.

The invention discloses a composite catalyst for producing styrene by side-chain alkylation of toluene and methanol, and a method for preparing styrene. The catalyst comprises: a basic molecular sieve catalyst and a loaded boron catalyst. When the composite catalyst is used in the side chain alkylation reaction of toluene and methanol, it can effectively control the decomposition of methanol and the hydrogen transfer reaction between styrene and methanol during the reaction process, inhibit the production of ethylbenzene, and obtain a higher conversion of toluene rate and styrene selectivity. Another aspect of the present invention also provides a styrene preparation method using the catalyst.

The invention relates to a catalyst composition containing modified ZSM-11 zeolite and its application. The catalyst composition has the following composition: ZSM-11 zeolite 30%~85%, binder 10%~60%, alkali metal oxide 0.1%~10%, ZSM-11 zeolite modification additive silica 1%~ 20%, ZSM-11 zeolite modification additive alkaline earth metal oxide 1%~20%. The catalyst composition of the invention is used in the toluene alkylation process for synthesizing p-methylethylbenzene from toluene and ethylene, and has good catalytic reaction effect.

The invention discloses an alkylation catalyst containing modified ZSM-11 zeolite and its application. In terms of weight percentage of the catalyst, it has the following composition: ZSM-11 zeolite 30%~85%, binder 10%~60%, alkali metal oxide 0.1%~10%, ZSM-11 zeolite modification additive silica 1 %~20%, ZSM-11 zeolite modification additive rare earth metal oxide 0.5%~30%. The catalyst of the invention is applied in the toluene alkylation process for synthesizing p-methylethylbenzene from toluene and ethylene, and has good catalytic reaction effect.

The invention discloses a toluene disproportionation and transalkylation catalyst, and a preparation method and application thereof. The catalyst is composed of hydrogen-type ZSM-5 molecular sieve and an inorganic refractory oxide, the content of hydrogen-type ZSM-5 molecular sieve is 10 wt%-90 wt%, the molar ratio of silicon oxide to aluminium oxide is 20-100, the specific surface area is 350-550 m<2> / g, the molecular sieve possesses weak acids, strong acids and superacids at the same time, the total acid content is 0.25-0.82 mmol / g, the molar ratio of Bronsted acids to Lewis acids is 1.1-2.1, and the molar ratio of the acid content sum of strong acids and superacids to the acid content of weak acids is 1.2-2. The catalyst is employed for toluene disproportionation and transalkylation, and has the characteristics of high toluene conversion rate and high xylene selectivity.

The invention discloses a catalyst of toluene disproportionation and alkyl transference, and a preparation method and an application thereof. The catalyst comprises 10 wt%-90 wt% of hydrogen Eu-1 / Beta composite molecular sieve, 5 wt%-85 wt% of an inorganic refractory oxide, 0.1 wt%-10 wt% of bismuth oxide, and 0.1 wt%-10 wt% of one or more of molybdenum oxide, silver oxide, zirconium oxide, strontium oxide, lanthanum oxide, copper oxide and rhenium oxide. The composite molecular sieve catalyst of toluene disproportionation and alkyl transference has good usage performance without loading metal components, and has relatively high toluene conversion rate and relatively high selectivity of benzene and dimethylbenzene (B+C8A).