37 results about "2,6-Dimethylnaphthalene" patented technology

The invention provides a method for preparing 2,6-dimethylnaphthalene by catalyzing naphthalene alkylation reaction with CoAPO-11 molecular sieve, relates to a method for preparing 2,6-dimethylnaphthalene, and is used for solving the problems that the traditional catalyst cannot simultaneously have high activity and high selectivity of 2,6-dimethylnaphthalene. The method comprises the steps of: activating the CoAPO-11 molecular sieve synthesized by an electrical heating method or microwave heating method for 2h, then mixing with naphthalene, alkylation reagents and solvent to prepare raw material liquid, and carrying out alkylation reaction to obtain 2,6-dimethylnaphthalene. According to the invention, the synthesized CoAPO-11 molecular sieve has higher catalytic reaction activity on naphthalene alkylation reaction, and higher selectivity of 2,6-dimethylnaphthalene; and the method is suitable for preparing 2,6-dimethylnaphthalene.

The present invention belongs to the technical field of preparation of 2,6-dimethylnaphthalene, and particularly relates to a method for using CuSAPO-11 molecular sieve for preparation of 2,6-dimethylnaphthalene. The method solves the technical problems that high activity and high 2,6-DMN selectivity of a molecular sieve catalyst used in 2,6-dimethylnaphthalene preparation methods in the prior art are difficult to achieved at the same time and stability of the catalyst is poor. The catalyst used in the method is the silicon phosphate copper and aluminum molecular sieve CuSAPO-11, a copper salt is added into a process for synthesis of silicon phosphate aluminum molecular sieve SAPO-11 by use a hydrothermal synthetic method for further synthesis of the new type silicon phosphate copper and aluminum molecular sieve CuSAPO-11. The molecular sieve catalyst has suitable acid property, high specific surface area and large mesoporous pore size, so that the molecular sieve catalyst shows higher catalytic activity in the alkylation reaction of naphthalene, the molecular sieve catalyst has high 2,6-dimethylnaphthalene selectivity, and the ratio of 2,6-dimethylnaphthalene to 2,7-dimethylnaphthalene is high.

The invention relates to a method for synthetizing 2,6-dimethylnaphthalene with methanol, C10 arene and 2-methylnaphthalene through alkylation. The method uses the mixture of 2-methylnaphthalene, methanol and C10 arene which is C10 aromatic mixture mainly containing tetramethylbenzene and is a byproduct obtained from the aromatic device, as raw material to prepare 2,6-dimethylnaphthalene through alkylation in the existence of a molecular sieve catalyst. In particular, methanol is used as the raw material a, C10 arene is used as the raw material b and 2-methylnaphthalene is used as the raw material c; the raw materials are used to prepare the raw material mixture, wherein the ratio of a to c is 1-3:1(mol/mol) and the ratio of b to c is 1-6:1(mol/mol); and 2,6-dimethylnaphthalene is synthetized through alkylation in the existence of the molecular sieve catalyst under the conditions that the reaction temperature is 380-500 DEG C, the reaction pressure is 0-6.0MPa and the reaction air speed is 0.1-2h<-1>. By adopting the method, the C10 arene resource which is the byproduct with low value can be utilized, methanol with low price and rich source is introduced in the reactant and the reaction activity, selectivity and reaction stability can be effectively increased.

Process for the preparation of 2,6-dimethylnaphthalene comprising reacting with at least one aromatic hydrocarbon, in the presence of a zeolitic catalyst, a mixture of naphthalenes comprising a cut obtained by the fractionation of suitable petrochemical streams and subsequent treatment of the product thus obtained with a solid acid.

An object of the present invention is to provide a method for manufacturing 2,6-DMN, in which even when a mixture containing DMN isomers which includes 5 wt % or more of 2,7-DMN is used, a highly pure 2,6-DMN can be obtained. The method for manufacturing the highly pure 2,6-dimethylnaphthalene of the present invention comprises performing cooling crystallization of a mixture containing dimethylnaphthalenes which includes 2,6-dimethylnaphthalene, performing solid-liquid separation to obtain a solid component, and washing the solid component using a solvent, wherein the solid-liquid separation performed after the cooling crystallization includes press filtration. In the present invention, the pressure of the press filtration is preferably 10 kg/cm² or more, and according to the method of the present invention, even when a DMN mixture containing 5 wt % or more of 2,7-DMN is used as a feedstock, a highly pure 2,6-DMN can be manufactured, and in addition, even when a DMN mixture containing less than 25 wt % of 2,6-DMN is processed by cooling crystallization, a highly pure 2,6-DMN can be manufactured.

The invention relates to a method for synthesizing 2,6-dimethylnaphthalene with 2-methylnaphthalene and C10 aromatics by transferring an alkyl group, in particular to a method for synthesizing the 2,6-dimethylnaphthalene by transferring the alkyl group through a molecular sieve based catalyst by using the 2-methylnaphthalene and the C10 aromatics (which is an aromatics mixture using tetramethylbenzene as a main component, wherein the carbon atom number of the mixture is 10, and the mixture is a by-product of a petrifaction aromatics device) as raw materials. The method comprises the following steps of: blending the C10 aromatics a and the 2-methylnaphthalene b which are used as the raw materials into a mixture raw material by a weight ratio of a:b=1-5:1; keeping the reaction airspeed to be 0.1-3 h<-1> at a reaction temperature of 360-540 DEG C and a reaction pressure of 0-7.0 MPa; and realizing an alkyl group transfer reaction through the molecular sieve based catalyst to synthesize the 2,6-dimethylnaphthalene. In the invention, the catalyst has low inactivation speed and longer service life, and meanwhile, the reaction selectivity and the yield of the 2,6-dimethylnaphthalene can be effectively improved; in addition, the mixture of the C10 aromatics is used as the raw material, and thus the production process of the 2,6-dimethylnaphthalene is effectively simplified; and the utilization of the C10 aromatics resource which is a byproduct and has low carbon value is also beneficial to the reducing of the production cost.