Method for catalyzing and preparing 2, 6-dimethylnaphalene by utilizing SAPO-31 molecular sieve

A SAPO-31, catalytic preparation technology, applied in organic chemistry, condensation between hydrocarbons and non-hydrocarbons to produce hydrocarbons, etc., can solve the problems of low selectivity and small ratio, achieve simple operation, easy separation, and facilitate large-scale industrialization production effect

Inactive Publication Date: 2012-06-13
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention solves the problems of low selectivity to the target product 2,6-DMN and small ratio of 2,6-DMN/2,7-DMN in the existing method for cont

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0008] Specific embodiment one: This embodiment is a kind of method that utilizes SAPO-31 molecular sieve to catalyze the preparation of 2,6-dimethylnaphthalene, and is specifically completed according to the following steps:

[0009] 1. Preparation of the raw material solution: Mix the naphthalene raw material, the alkylating agent and the solvent evenly to obtain the raw material solution; 2. Alkylation reaction: First, the ratio of silicon to aluminum (SiO 2 / Al 2 O 3 ) is 0.3-0.7, 20-40 mesh SAPO-31 molecular sieves are loaded into the fixed-bed reactor, and the temperature is 400 ℃~600 ℃, the carrier gas is nitrogen, and the carrier gas flow rate is 50ml / min~100ml / min conditions Activated for 40min~120min at low temperature, and then injected the raw material liquid prepared in step 1 into the fixed bed reactor by continuous injection, and the temperature was 350℃~450℃, the pressure was 2MPa~5MPa, and the mass space velocity was 0.5h -1 ~2h -1 , Under the condition tha...

Example Embodiment

[0041] Embodiment 2: The difference between this embodiment and Embodiment 1 is: the naphthalene raw material described in step 1 is a mixture of naphthalene, β-methylnaphthalene or β-methylnaphthalene and α-methylnaphthalene in any ratio methylnaphthalene. Others are the same as the first embodiment.

Example Embodiment

[0042] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the alkylating reagent described in Step 1 is methanol. Others are the same as in the first or second embodiment.

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Abstract

A method for catalyzing and preparing 2, 6-dimethylnaphalene by utilizing an SAPO-31 molecular sieve relates to a method for preparing the 2, 6-dimethylnaphalene and aims at solving the problems of low selectivity of target product 2, 6-dimethylnitrosamine (DMN) and small ratio of 2, 6-DMN to 2, 7-DMN by means of an existing method for preparing the 2, 6-dimethylnaphalene continuously. The method comprises the steps of mixing raw materials to produce raw material liquid, performing alkylation reaction by adopting the SAPO-31 molecular sieve to produce a reaction product, and finally performing separation through eutectic melting crystallization to produce the 2, 6-dimethylnaphalene. The method has the advantages that 1 the selectivity of target product 2, 6-DMN is 30%-60%, the ratio of 2, 6-DMN to 2, 7-DMN is 2-9, and purity of produced 2, 6-DMN is 55%-90%, and 2 the reaction product and catalyst are easily separated and the production cost is reduced. The method is mainly used for preparing the 2, 6-dimethylnaphalen.

Description

technical field [0001] The invention relates to a method for preparing 2,6-dimethylnaphthalene. Background technique [0002] 2,6-Dimethylnaphthalene (2,6-DMN) is the key raw material for the preparation of polyethylene naphthalate (PEN) polymerized monomer 2,6-naphthalene dicarboxylic acid, and PEN is a potential Compared with polyethylene terephthalate (PET), PEN has superior heat resistance, mechanical properties, chemical stability, gas barrier and resistance to ultraviolet rays and radiation. Performance, can replace PET in the manufacturing industries of electronic components, instruments and meters, insulating materials, fibers, films, video tapes, disks, food packaging, impact-resistant packaging for precision instruments, beer bottles, aerospace and atomic energy materials, etc. The application prospects are very broad. It is one of the fastest developed and applied polymer materials in the past 10 years. [0003] At present, the preparation methods of 2,6-DMN mai...

Claims

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Application Information

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IPC IPC(8): C07C15/24C07C2/86
Inventor 吴伟李程
Owner HEILONGJIANG UNIV
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